/****************************************************************************
** $Id: dl_dxf.cpp,v 1.1 2007/10/08 15:31:17 oconrad Exp $
**
** Copyright (C) 2001-2003 RibbonSoft. All rights reserved.
**
** This file is part of the dxflib project.
**
** This file may be distributed and/or modified under the terms of the
** GNU General Public License version 2 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.
**
** Licensees holding valid dxflib Professional Edition licenses may use 
** this file in accordance with the dxflib Commercial License
** Agreement provided with the Software.
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
** See http://www.ribbonsoft.com for further details.
**
** Contact info@ribbonsoft.com if any conditions of this licensing are
** not clear to you.
**
**********************************************************************/

#include "dl_dxf.h"

#include <algorithm>
#include <string>
#include <cstdio>
#include <cassert>
#include <cmath>

#include "dl_attributes.h"
#include "dl_codes.h"
#include "dl_creationinterface.h"
#include "dl_writer_ascii.h"


/**
 * Default constructor.
 */
DL_Dxf::DL_Dxf() {
    styleHandleStd = 0;
    version = VER_2000;

    vertices = NULL;
    maxVertices = 0;
    vertexIndex = 0;

    knots = NULL;
    maxKnots = 0;
    knotIndex = 0;

    controlPoints = NULL;
    maxControlPoints = 0;
    controlPointIndex = 0;

    leaderVertices = NULL;
    maxLeaderVertices = 0;
    leaderVertexIndex = 0;

    hatchLoops = NULL;
    maxHatchLoops = 0;
    hatchLoopIndex = -1;
    hatchEdges = NULL;
    maxHatchEdges = NULL;
    hatchEdgeIndex = NULL;
    dropEdges = false;

    //bulge = 0.0;
}



/**
 * Destructor.
 */
DL_Dxf::~DL_Dxf() {
    if (vertices!=NULL) {
        delete[] vertices;
    }
    if (knots!=NULL) {
        delete[] knots;
    }
    if (controlPoints!=NULL) {
        delete[] controlPoints;
    }
    if (leaderVertices!=NULL) {
        delete[] leaderVertices;
    }
    if (hatchLoops!=NULL) {
        delete[] hatchLoops;
    }
    if (hatchEdges!=NULL) {
        for (int i=0; i<maxHatchLoops; ++i) {
            if (hatchEdges[i]!=NULL) {
                delete[] hatchEdges[i];
            }
        }
        delete[] hatchEdges;
    }
    if (maxHatchEdges!=NULL) {
        delete[] maxHatchEdges;
    }
    if (hatchEdgeIndex!=NULL) {
        delete[] hatchEdgeIndex;
    }
}



/**
 * @brief Reads the given file and calls the appropriate functions in
 * the given creation interface for every entity found in the file.
 *
 * @param file Input
 *		Path and name of file to read
 * @param creationInterface
 *		Pointer to the class which takes care of the entities in the file.
 *
 * @retval true If \p file could be opened.
 * @retval false If \p file could not be opened.
 */
bool DL_Dxf::in(const string& file, DL_CreationInterface* creationInterface) {
    FILE *fp;
    firstCall = true;
    currentEntity = DL_UNKNOWN;
    int errorCounter = 0;

    fp = fopen(file.c_str(), "rt");
    if (fp) {
        while (readDxfGroups(fp, creationInterface, &errorCounter)) {}
        fclose(fp);
        if (errorCounter>0) {
            std::cerr << "DXF Filter: There have been " << errorCounter <<
            " errors. The drawing might be incomplete / incorrect.\n";
        }
        return true;
    }

    return false;
}



/**
 * Reads a DXF file from an existing stream.
 *
 * @param stream The string stream.
 * @param creationInterface
 *		Pointer to the class which takes care of the entities in the file.
 *
 * @retval true If \p file could be opened.
 * @retval false If \p file could not be opened.
 */
#ifndef __GCC2x__
bool DL_Dxf::in(std::stringstream& stream,
                DL_CreationInterface* creationInterface) {

    int errorCounter = 0;

    if (stream.good()) {
        firstCall=true;
        currentEntity = DL_UNKNOWN;
        while (readDxfGroups(stream, creationInterface, &errorCounter)) {}
        if (errorCounter>0) {
            std::cerr << "DXF Filter: There have been " << errorCounter <<
            " errors. The drawing might be incomplete / incorrect.\n";
        }
        return true;
    }
    return false;
}
#endif



/**
 * @brief Reads a group couplet from a DXF file.  Calls another function
 * to process it.
 *
 * A group couplet consists of two lines that represent a single
 * piece of data.  An integer constant on the first line indicates
 * the type of data.  The value is on the next line.\n
 *
 * This function reads a couplet, determines the type of data, and
 * passes the value to the the appropriate handler function of
 * \p creationInterface.\n
 * 
 * \p fp is advanced so that the next call to \p readDXFGroups() reads
 * the next couplet in the file.
 *
 * @param fp Handle of input file
 * @param creationInterface Handle of class which processes entities
 *		in the file
 *
 * @retval true If EOF not reached.
 * @retval false If EOF reached.
 */
bool DL_Dxf::readDxfGroups(FILE *fp, DL_CreationInterface* creationInterface,
                           int* errorCounter) {

    bool ok = true;
    static int line = 1;

    // Read one group of the DXF file and chop the lines:
    if (DL_Dxf::getChoppedLine(groupCodeTmp, DL_DXF_MAXLINE, fp) &&
            DL_Dxf::getChoppedLine(groupValue, DL_DXF_MAXLINE, fp) ) {

        groupCode = (unsigned int)stringToInt(groupCodeTmp, &ok);

        if (ok) {
            //std::cerr << groupCode << "\n";
            //std::cerr << groupValue << "\n";
            line+=2;
            processDXFGroup(creationInterface, groupCode, groupValue);
        } else {
            std::cerr << "DXF read error: Line: " << line << "\n";
            if (errorCounter!=NULL) {
                (*errorCounter)++;
            }
            // try to fix:
            std::cerr << "DXF read error: trying to fix..\n";
            // drop a line to sync:
            DL_Dxf::getChoppedLine(groupCodeTmp, DL_DXF_MAXLINE, fp);
        }
    }

    return !feof(fp);
}



/**
 * Same as above but for stringstreams.
 */
#ifndef __GCC2x__
bool DL_Dxf::readDxfGroups(std::stringstream& stream,
                           DL_CreationInterface* creationInterface,
                           int* errorCounter) {

    bool ok = true;
    static int line = 1;

    // Read one group of the DXF file and chop the lines:
    if (DL_Dxf::getChoppedLine(groupCodeTmp, DL_DXF_MAXLINE, stream) &&
            DL_Dxf::getChoppedLine(groupValue, DL_DXF_MAXLINE, stream) ) {

        groupCode = (unsigned int)stringToInt(groupCodeTmp, &ok);

        if (ok) {
            //std::cout << groupCode << "\n";
            //std::cout << groupValue << "\n";
            line+=2;
            processDXFGroup(creationInterface, groupCode, groupValue);
        } else {
            std::cerr << "DXF read error: Line: " << line << "\n";
            if (errorCounter!=NULL) {
                (*errorCounter)++;
            }
            // try to fix:
            std::cerr << "DXF read error: trying to fix..\n";
            // drop a line to sync:
            DL_Dxf::getChoppedLine(groupCodeTmp, DL_DXF_MAXLINE, stream);
        }
    }
    return !stream.eof();
}
#endif



/**
 * @brief Reads line from file & strips whitespace at start and newline 
 * at end.
 *
 * @param s Output\n
 *		Pointer to character array that chopped line will be returned in.
 * @param size Size of \p s.  (Including space for NULL.)
 * @param fp Input\n
 *		Handle of input file.
 *
 * @retval true if line could be read
 * @retval false if \p fp is already at end of file
 *
 * @todo Change function to use safer FreeBSD strl* functions
 * @todo Is it a problem if line is blank (i.e., newline only)?
 *		Then, when function returns, (s==NULL).
 */
bool DL_Dxf::getChoppedLine(char *s, unsigned int size, FILE *fp) {
    if (!feof(fp)) {
        // The whole line in the file.  Includes space for NULL.
        char* wholeLine = new char[size];
        // Only the useful part of the line
        char* line;

        line = fgets(wholeLine, size, fp);

        if (line!=NULL && line[0] != '\0') { // Evaluates to fgets() retval
            // line == wholeLine at this point.
            // Both guaranteed to be NULL terminated.

            // Strip leading whitespace and trailing CR/LF.
            stripWhiteSpace(&line);

            strncpy(s, line, size);
            s[size] = '\0';
            // s should always be NULL terminated, because:
            assert(size > strlen(line));
        }

        delete[] wholeLine; // Done with wholeLine

        return true;
    } else {
        s[0] = '\0';
        return false;
    }
}



/**
 * Same as above but for stringstreams.
 */
#ifndef __GCC2x__
bool DL_Dxf::getChoppedLine(char *s, unsigned int size,
                            std::stringstream& stream) {

    if (!stream.eof()) {
        // Only the useful part of the line
        stream.getline(s, size);
        stripWhiteSpace(&s);
        assert(size > strlen(s));
        return true;
    } else {
        s[0] = '\0';
        return false;
    }
}
#endif



/**
 * @brief Strips leading whitespace and trailing Carriage Return (CR)
 * and Line Feed (LF) from NULL terminated string.
 *
 * @param s Input and output.
 *		NULL terminates string.
 *
 * @retval true if \p s is non-NULL
 * @retval false if \p s is NULL
 */
bool DL_Dxf::stripWhiteSpace(char** s) {
    // last non-NULL char:
    int lastChar = strlen(*s) - 1;
    //std::cout << "lastChar: " << lastChar << "\n";

    // Is last character CR or LF?
    while ( (lastChar >= 0) &&
            (((*s)[lastChar] == 10) || ((*s)[lastChar] == 13) ||
             ((*s)[lastChar] == ' ' || ((*s)[lastChar] == '\t'))) ) {
        (*s)[lastChar] = '\0';
        lastChar--;
    }

    // Skip whitespace, excluding \n, at beginning of line
    while ((*s)[0]==' ' || (*s)[0]=='\t') {
        ++(*s);
    }

    return ((*s) ? true : false);
}



/**
 * Processes a group (pair of group code and value).
 *
 * @param creationInterface Handle to class that creates entities and
 * other CAD data from DXF group codes
 *
 * @param groupCode Constant indicating the data type of the group.
 * @param groupValue The data value.
 *
 * @retval true if done processing current entity and new entity begun
 * @retval false if not done processing current entity
*/
bool DL_Dxf::processDXFGroup(DL_CreationInterface* creationInterface,
                             int groupCode, const char *groupValue) {


    //std::cout << "DL_Dxf::processDXFGroup: " << groupCode << ": "
    //<< groupValue << "\n";

    // Init on first call
    if (firstCall) {
        for (int i=0; i<DL_DXF_MAXGROUPCODE; ++i) {
            values[i][0] = '\0';
        }
        settingValue[0] = '\0';
        firstCall=false;
    }

    // Indicates comment or dxflib version:
    if (groupCode==999) {
        //std::cout << "999: " << groupValue << "\n";
        if (groupValue!=NULL) {
            if (!strncmp(groupValue, "dxflib", 6)) {
                //std::cout << "dxflib version found" << "\n";
                libVersion = getLibVersion(&groupValue[7]);
            }
        }
    }

    // Indicates start of new entity or var
    else if (groupCode==0 || groupCode==9) {

        // If new entity is encountered, the last one must be complete
        // prepare attributes which can be used for most entities:
        char name[DL_DXF_MAXLINE+1];
        if ((values[8])[0]!='\0') {
            strcpy(name, values[8]);
        }
        // defaults to layer '0':
        else {
            strcpy(name, "0");
        }

        int width;
        // Compatibillity with qcad1:
        if ((values[39])[0]!='\0' &&
                (values[370])[0]=='\0') {
            width = toInt(values[39], -1);
        }
        // since autocad 2002:
        else if ((values[370])[0]!='\0') {
            width = toInt(values[370], -1);
        }
        // default to BYLAYER:
        else {
            width = -1;
        }

        int color;
        color = toInt(values[62], 256);

        char linetype[DL_DXF_MAXLINE+1];
        strcpy(linetype, toString(values[6], "BYLAYER"));

        attrib = DL_Attributes(values[8],          // layer
                               color,              // color
                               width,              // width
                               linetype);          // linetype
        creationInterface->setAttributes(attrib);

        creationInterface->setExtrusion(toReal(values[210], 0.0),
                                        toReal(values[220], 0.0),
                                        toReal(values[230], 1.0),
                                        toReal(values[30], 0.0));

        // Add the last entity via creationInterface
        switch (currentEntity) {
        case DL_SETTING:
            addSetting(creationInterface);
            break;

        case DL_LAYER:
            addLayer(creationInterface);
            break;

        case DL_BLOCK:
            addBlock(creationInterface);
            break;

        case DL_ENDBLK:
            endBlock(creationInterface);
            break;

        case DL_ENTITY_POINT:
            addPoint(creationInterface);
            break;

        case DL_ENTITY_LINE:
            addLine(creationInterface);
            break;

        case DL_ENTITY_POLYLINE:
            //bulge = toReal(values[42]);
            // fall through
        case DL_ENTITY_LWPOLYLINE:
            addPolyline(creationInterface);
            break;

        case DL_ENTITY_VERTEX:
            addVertex(creationInterface);
            break;

        case DL_ENTITY_SPLINE:
            addSpline(creationInterface);
            break;

        case DL_ENTITY_ARC:
            addArc(creationInterface);
            break;

        case DL_ENTITY_CIRCLE:
            addCircle(creationInterface);
            break;

        case DL_ENTITY_ELLIPSE:
            addEllipse(creationInterface);
            break;

        case DL_ENTITY_INSERT:
            addInsert(creationInterface);
            break;

        case DL_ENTITY_MTEXT:
            addMText(creationInterface);
            break;

        case DL_ENTITY_TEXT:
            addText(creationInterface);
            break;

        case DL_ENTITY_ATTRIB:
            addAttrib(creationInterface);
            break;

        case DL_ENTITY_DIMENSION: {
                int type = (toInt(values[70], 0)&0x07);

                switch (type) {
                case 0:
                    addDimLinear(creationInterface);
                    break;

                case 1:
                    addDimAligned(creationInterface);
                    break;

                case 2:
                    addDimAngular(creationInterface);
                    break;

                case 3:
                    addDimDiametric(creationInterface);
                    break;

                case 4:
                    addDimRadial(creationInterface);
                    break;

                case 5:
                    addDimAngular3P(creationInterface);
                    break;

                default:
                    break;
                }
            }
            break;

        case DL_ENTITY_LEADER:
            addLeader(creationInterface);
            break;

        case DL_ENTITY_HATCH:
            addHatch(creationInterface);
            break;

        case DL_ENTITY_IMAGE:
            addImage(creationInterface);
            break;

        case DL_ENTITY_IMAGEDEF:
            addImageDef(creationInterface);
            break;

        case DL_ENTITY_TRACE:
            addTrace(creationInterface);
            break;

        case DL_ENTITY_SOLID:
            addSolid(creationInterface);
            break;

        case DL_ENTITY_SEQEND:
            endSequence(creationInterface);
            break;

        default:
            break;
        }


        // reset all values (they are not persistent and only this
        //  way we can detect default values for unstored settings)
        for (int i=0; i<DL_DXF_MAXGROUPCODE; ++i) {
            values[i][0] = '\0';
        }
        settingValue[0] = '\0';
        settingKey[0] = '\0';


        // Last DXF entity or setting has been handled
        // Now determine what the next entity or setting type is

		int prevEntity = currentEntity;

        // Read DXF settings:
        if (groupValue[0]=='$') {
            currentEntity = DL_SETTING;
            strncpy(settingKey, groupValue, DL_DXF_MAXLINE);
            settingKey[DL_DXF_MAXLINE] = '\0';
        }
        // Read Layers:
        else if (!strcmp(groupValue, "LAYER")) {
            currentEntity = DL_LAYER;

        }
        // Read Blocks:
        else if (!strcmp(groupValue, "BLOCK")) {
            currentEntity = DL_BLOCK;
        } else if (!strcmp(groupValue, "ENDBLK")) {
            currentEntity = DL_ENDBLK;

        }
        // Read entities:
        else if (!strcmp(groupValue, "POINT")) {
            currentEntity = DL_ENTITY_POINT;
        } else if (!strcmp(groupValue, "LINE")) {
            currentEntity = DL_ENTITY_LINE;
        } else if (!strcmp(groupValue, "POLYLINE")) {
            currentEntity = DL_ENTITY_POLYLINE;
        } else if (!strcmp(groupValue, "LWPOLYLINE")) {
            currentEntity = DL_ENTITY_LWPOLYLINE;
        } else if (!strcmp(groupValue, "VERTEX")) {
            currentEntity = DL_ENTITY_VERTEX;
        } else if (!strcmp(groupValue, "SPLINE")) {
            currentEntity = DL_ENTITY_SPLINE;
        } else if (!strcmp(groupValue, "ARC")) {
            currentEntity = DL_ENTITY_ARC;
        } else if (!strcmp(groupValue, "ELLIPSE")) {
            currentEntity = DL_ENTITY_ELLIPSE;
        } else if (!strcmp(groupValue, "CIRCLE")) {
            currentEntity = DL_ENTITY_CIRCLE;
        } else if (!strcmp(groupValue, "INSERT")) {
            currentEntity = DL_ENTITY_INSERT;
        } else if (!strcmp(groupValue, "TEXT")) {
            currentEntity = DL_ENTITY_TEXT;
        } else if (!strcmp(groupValue, "MTEXT")) {
            currentEntity = DL_ENTITY_MTEXT;
        } else if (!strcmp(groupValue, "ATTRIB")) {
            currentEntity = DL_ENTITY_ATTRIB;
        } else if (!strcmp(groupValue, "DIMENSION")) {
            currentEntity = DL_ENTITY_DIMENSION;
        } else if (!strcmp(groupValue, "LEADER")) {
            currentEntity = DL_ENTITY_LEADER;
        } else if (!strcmp(groupValue, "HATCH")) {
            currentEntity = DL_ENTITY_HATCH;
        } else if (!strcmp(groupValue, "IMAGE")) {
            currentEntity = DL_ENTITY_IMAGE;
        } else if (!strcmp(groupValue, "IMAGEDEF")) {
            currentEntity = DL_ENTITY_IMAGEDEF;
        } else if (!strcmp(groupValue, "TRACE")) {
           currentEntity = DL_ENTITY_TRACE;
        } else if (!strcmp(groupValue, "SOLID")) {
           currentEntity = DL_ENTITY_SOLID;
        } else if (!strcmp(groupValue, "SEQEND")) {
            currentEntity = DL_ENTITY_SEQEND;
        } else {
            currentEntity = DL_UNKNOWN;
        }

		// end of old style POLYLINE entity
		if (prevEntity==DL_ENTITY_VERTEX && currentEntity!=DL_ENTITY_VERTEX) {
			endEntity(creationInterface);
		}

        return true;

    } else {
        // Group code does not indicate start of new entity or setting,
        // so this group must be continuation of data for the current
        // one.
        if (groupCode<DL_DXF_MAXGROUPCODE) {

            bool handled = false;

            switch (currentEntity) {
            case DL_ENTITY_MTEXT:
                handled = handleMTextData(creationInterface);
                break;

            case DL_ENTITY_LWPOLYLINE:
                handled = handleLWPolylineData(creationInterface);
                break;

            case DL_ENTITY_SPLINE:
                handled = handleSplineData(creationInterface);
                break;

            case DL_ENTITY_LEADER:
                handled = handleLeaderData(creationInterface);
                break;

            case DL_ENTITY_HATCH:
                handled = handleHatchData(creationInterface);
                break;

            default:
                break;
            }

            if (!handled) {
                // Normal group / value pair:
                strncpy(values[groupCode], groupValue, DL_DXF_MAXLINE);
                values[groupCode][DL_DXF_MAXLINE] = '\0';
            }
        }

        return false;
    }
    return false;
}



/**
 * Adds a variable from the DXF file.
 */
void DL_Dxf::addSetting(DL_CreationInterface* creationInterface) {
    int c = -1;
    for (int i=0; i<=380; ++i) {
        if (values[i][0]!='\0') {
            c = i;
            break;
        }
    }

    // string
    if (c>=0 && c<=9) {
        creationInterface->setVariableString(settingKey,
                                             values[c], c);
    }
    // vector
    else if (c>=10 && c<=39) {
        if (c==10) {
            creationInterface->setVariableVector(
                settingKey,
                toReal(values[c]),
                toReal(values[c+10]),
                toReal(values[c+20]),
                c);
        }
    }
    // double
    else if (c>=40 && c<=59) {
        creationInterface->setVariableDouble(settingKey,
                                             toReal(values[c]),
                                             c);
    }
    // int
    else if (c>=60 && c<=99) {
        creationInterface->setVariableInt(settingKey,
                                          toInt(values[c]),
                                          c);
    }
    // misc
    else if (c>=0) {
        creationInterface->setVariableString(settingKey,
                                             values[c],
                                             c);
    }
}



/**
 * Adds a layer that was read from the file via the creation interface.
 */
void DL_Dxf::addLayer(DL_CreationInterface* creationInterface) {
    // correct some impossible attributes for layers:
    attrib = creationInterface->getAttributes();
    if (attrib.getColor()==256 || attrib.getColor()==0) {
        attrib.setColor(7);
    }
    if (attrib.getWidth()<0) {
        attrib.setWidth(1);
    }
    if (!strcasecmp(attrib.getLineType().c_str(), "BYLAYER") ||
            !strcasecmp(attrib.getLineType().c_str(), "BYBLOCK")) {
        attrib.setLineType("CONTINUOUS");
    }

    // add layer
    creationInterface->addLayer(DL_LayerData(values[2],
                                toInt(values[70])));
}



/**
 * Adds a block that was read from the file via the creation interface.
 */
void DL_Dxf::addBlock(DL_CreationInterface* creationInterface) {
    DL_BlockData d(
        // Name:
        values[2],
        // flags:
        toInt(values[70]),
        // base point:
        toReal(values[10]),
        toReal(values[20]),
        toReal(values[30]));

    creationInterface->addBlock(d);
}



/**
 * Ends a block that was read from the file via the creation interface.
 */
void DL_Dxf::endBlock(DL_CreationInterface* creationInterface) {
    creationInterface->endBlock();
}



/**
 * Adds a point entity that was read from the file via the creation interface.
 */
void DL_Dxf::addPoint(DL_CreationInterface* creationInterface) {
    DL_PointData d(toReal(values[10]),
                   toReal(values[20]),
                   toReal(values[30]));
    creationInterface->addPoint(d);
}



/**
 * Adds a line entity that was read from the file via the creation interface.
 */
void DL_Dxf::addLine(DL_CreationInterface* creationInterface) {
    DL_LineData d(toReal(values[10]),
                  toReal(values[20]),
                  toReal(values[30]),
                  toReal(values[11]),
                  toReal(values[21]),
                  toReal(values[31]));

    creationInterface->addLine(d);
}



/**
 * Adds a polyline entity that was read from the file via the creation interface.
 */
void DL_Dxf::addPolyline(DL_CreationInterface* creationInterface) {
    DL_PolylineData pd(maxVertices, toInt(values[71], 0), toInt(values[72], 0), toInt(values[70], 0));
    creationInterface->addPolyline(pd);

    if (currentEntity==DL_ENTITY_LWPOLYLINE) {
        for (int i=0; i<maxVertices; i++) {
            DL_VertexData d(vertices[i*4],
                            vertices[i*4+1],
                            vertices[i*4+2],
                            vertices[i*4+3]);

            creationInterface->addVertex(d);
        }
		creationInterface->endEntity();
    }
}



/**
 * Adds a polyline vertex entity that was read from the file 
 * via the creation interface.
 */
void DL_Dxf::addVertex(DL_CreationInterface* creationInterface) {
    DL_VertexData d(toReal(values[10]),
                    toReal(values[20]),
                    toReal(values[30]),
                    //bulge);
                    toReal(values[42]));

    //bulge = toReal(values[42]);

    creationInterface->addVertex(d);
}



/**
 * Adds a spline entity that was read from the file via the creation interface.
 */
void DL_Dxf::addSpline(DL_CreationInterface* creationInterface) {
    DL_SplineData sd(toInt(values[71], 3), 
                     maxKnots, 
                     maxControlPoints, 
                     toInt(values[70], 4));
    /*DL_SplineData sd(toInt(values[71], 3), toInt(values[72], 0),
                     toInt(values[73], 0), toInt(values[70], 4));*/
    creationInterface->addSpline(sd);

    int i;
    for (i=0; i<maxControlPoints; i++) {
        DL_ControlPointData d(controlPoints[i*3],
                              controlPoints[i*3+1],
                              controlPoints[i*3+2]);

        creationInterface->addControlPoint(d);
    }
    for (i=0; i<maxKnots; i++) {
      DL_KnotData k(knots[i]);

      creationInterface->addKnot(k);
    }
}



/**
 * Adds a knot to the previously added spline. 
 */
/*
void DL_Dxf::addKnot(DL_CreationInterface* creationInterface) {
   std::cout << "DL_Dxf::addKnot\n";
}
*/



/**
 * Adds a control point to the previously added spline. 
 */
/*
void DL_Dxf::addControlPoint(DL_CreationInterface* creationInterface) {
    std::cout << "DL_Dxf::addControlPoint\n";
}
*/



/**
 * Adds an arc entity that was read from the file via the creation interface.
 */
void DL_Dxf::addArc(DL_CreationInterface* creationInterface) {
    DL_ArcData d(toReal(values[10]),
                 toReal(values[20]),
                 toReal(values[30]),
                 toReal(values[40]),
                 toReal(values[50]),
                 toReal(values[51]));

    creationInterface->addArc(d);
}



/**
 * Adds a circle entity that was read from the file via the creation interface.
 */
void DL_Dxf::addCircle(DL_CreationInterface* creationInterface) {
    DL_CircleData d(toReal(values[10]),
                    toReal(values[20]),
                    toReal(values[30]),
                    toReal(values[40]));

    creationInterface->addCircle(d);
}



/**
 * Adds an ellipse entity that was read from the file via the creation interface.
 */
void DL_Dxf::addEllipse(DL_CreationInterface* creationInterface) {
    DL_EllipseData d(toReal(values[10]),
                     toReal(values[20]),
                     toReal(values[30]),
                     toReal(values[11]),
                     toReal(values[21]),
                     toReal(values[31]),
                     toReal(values[40], 1.0),
                     toReal(values[41], 0.0),
                     toReal(values[42], 2*M_PI));

    creationInterface->addEllipse(d);
}



/**
 * Adds an insert entity that was read from the file via the creation interface.
 */
void DL_Dxf::addInsert(DL_CreationInterface* creationInterface) {
    DL_InsertData d(values[2],
                    // insertion point
                    toReal(values[10], 0.0),
                    toReal(values[20], 0.0),
                    toReal(values[30], 0.0),
                    // scale:
                    toReal(values[41], 1.0),
                    toReal(values[42], 1.0),
                    toReal(values[43], 1.0),
                    // angle:
                    toReal(values[50], 0.0),
                    // cols / rows:
                    toInt(values[70], 1),
                    toInt(values[71], 1),
                    // spacing:
                    toReal(values[44], 0.0),
                    toReal(values[45], 0.0));

    creationInterface->addInsert(d);
}


/**
 * Adds a trace entity (4 edge closed polyline) that was read from the file via the creation interface.
 *
 * @author AHM
 */
void DL_Dxf::addTrace(DL_CreationInterface* creationInterface) {
    DL_TraceData td;
    
    for (int k = 0; k < 4; k++) {
       td.x[k] = toReal(values[10 + k]);
       td.y[k] = toReal(values[20 + k]);
       td.z[k] = toReal(values[30 + k]);
    }
    creationInterface->addTrace(td);
}

/**
 * Adds a solid entity (filled trace) that was read from the file via the creation interface.
 * 
 * @author AHM
 */
void DL_Dxf::addSolid(DL_CreationInterface* creationInterface) {
    DL_SolidData sd;
    
    for (int k = 0; k < 4; k++) {
       sd.x[k] = toReal(values[10 + k]);
       sd.y[k] = toReal(values[20 + k]);
       sd.z[k] = toReal(values[30 + k]);
    }
    creationInterface->addSolid(sd);
}


/**
 * Adds an MText entity that was read from the file via the creation interface.
 */
void DL_Dxf::addMText(DL_CreationInterface* creationInterface) {
    double angle = 0.0;

    if (values[50][0]!='\0') {
        if (libVersion<=0x02000200) {
            // wrong but compatible with dxflib <=2.0.2.0:
            angle = toReal(values[50], 0.0);
        } else {
            angle = (toReal(values[50], 0.0)*2*M_PI)/360.0;
        }
    } else if (values[11][0]!='\0' && values[21][0]!='\0') {
        double x = toReal(values[11], 0.0);
        double y = toReal(values[21], 0.0);

        if (fabs(x)<1.0e-6) {
            if (y>0.0) {
                angle = M_PI/2.0;
            } else {
                angle = M_PI/2.0*3.0;
            }
        } else {
            angle = atan(y/x);
        }
    }

    DL_MTextData d(
        // insertion point
        toReal(values[10], 0.0),
        toReal(values[20], 0.0),
        toReal(values[30], 0.0),
        // height
        toReal(values[40], 2.5),
        // width
        toReal(values[41], 100.0),
        // attachment point
        toInt(values[71], 1),
        // drawing direction
        toInt(values[72], 1),
        // line spacing style
        toInt(values[73], 1),
        // line spacing factor
        toReal(values[44], 1.0),
        // text
        values[1],
        // style
        values[7],
        // angle
        angle);
    creationInterface->addMText(d);
}



/**
 * Handles additional MText data.
 */
bool DL_Dxf::handleMTextData(DL_CreationInterface* creationInterface) {
    // Special handling of text chunks for MTEXT entities:
    if (groupCode==3) {
        creationInterface->addMTextChunk(groupValue);
        return true;
    }

    return false;
}



/**
 * Handles additional polyline data.
 */
bool DL_Dxf::handleLWPolylineData(DL_CreationInterface* /*creationInterface*/) {
    // Allocate LWPolyline vertices (group code 90):
    if (groupCode==90) {
        maxVertices = toInt(groupValue);
        if (maxVertices>0) {
            if (vertices!=NULL) {
                delete[] vertices;
            }
            vertices = new double[4*maxVertices];
            for (int i=0; i<maxVertices; ++i) {
                vertices[i*4] = 0.0;
                vertices[i*4+1] = 0.0;
                vertices[i*4+2] = 0.0;
                vertices[i*4+3] = 0.0;
            }
        }
        vertexIndex=-1;
        return true;
    }

    // Compute LWPolylines vertices (group codes 10/20/30/42):
    else if (groupCode==10 || groupCode==20 ||
             groupCode==30 || groupCode==42) {

        if (vertexIndex<maxVertices-1 && groupCode==10) {
            vertexIndex++;
        }

        if (groupCode<=30) {
            if (vertexIndex>=0 && vertexIndex<maxVertices) {
                vertices[4*vertexIndex + (groupCode/10-1)]
                = toReal(groupValue);
            }
        } else if (groupCode==42 && vertexIndex<maxVertices) {
            vertices[4*vertexIndex + 3] = toReal(groupValue);
        }
        return true;
    }
    return false;
}



/**
 * Handles additional spline data.
 */
bool DL_Dxf::handleSplineData(DL_CreationInterface* /*creationInterface*/) {
    // Allocate Spline knots (group code 72):
    if (groupCode==72) {
        maxKnots = toInt(groupValue);
        if (maxKnots>0) {
            if (knots!=NULL) {
                delete[] knots;
            }
            knots = new double[maxKnots];
            for (int i=0; i<maxKnots; ++i) {
                knots[i] = 0.0;
            }
        }
        knotIndex=-1;
        return true;
    }

    // Allocate Spline control points (group code 73):
    else if (groupCode==73) {
        maxControlPoints = toInt(groupValue);
        if (maxControlPoints>0) {
            if (controlPoints!=NULL) {
                delete[] controlPoints;
            }
            controlPoints = new double[3*maxControlPoints];
            for (int i=0; i<maxControlPoints; ++i) {
                controlPoints[i*3] = 0.0;
                controlPoints[i*3+1] = 0.0;
                controlPoints[i*3+2] = 0.0;
            }
        }
        controlPointIndex=-1;
        return true;
    }

    // Compute spline knot vertices (group code 40):
    else if (groupCode==40) {
        if (knotIndex<maxKnots-1) {
            knotIndex++;
            knots[knotIndex] = toReal(groupValue);
        }
        return true;
    }

    // Compute spline control points (group codes 10/20/30):
    else if (groupCode==10 || groupCode==20 ||
             groupCode==30) {

        if (controlPointIndex<maxControlPoints-1 && groupCode==10) {
            controlPointIndex++;
        }

        if (controlPointIndex>=0 && controlPointIndex<maxControlPoints) {
            controlPoints[3*controlPointIndex + (groupCode/10-1)]
            = toReal(groupValue);
        }
        return true;
    }
    return false;
}



/**
 * Handles additional leader data.
 */
bool DL_Dxf::handleLeaderData(DL_CreationInterface* /*creationInterface*/) {
    // Allocate Leader vertices (group code 76):
    if (groupCode==76) {
        maxLeaderVertices = toInt(groupValue);
        if (maxLeaderVertices>0) {
            if (leaderVertices!=NULL) {
                delete[] leaderVertices;
            }
            leaderVertices = new double[3*maxLeaderVertices];
            for (int i=0; i<maxLeaderVertices; ++i) {
                leaderVertices[i*3] = 0.0;
                leaderVertices[i*3+1] = 0.0;
                leaderVertices[i*3+2] = 0.0;
            }
        }
        leaderVertexIndex=-1;
        return true;
    }

    // Compute Leader vertices (group codes 10/20/30):
    else if (groupCode==10 || groupCode==20 || groupCode==30) {

        if (leaderVertexIndex<maxLeaderVertices-1 && groupCode==10) {
            leaderVertexIndex++;
        }

        if (groupCode<=30) {
            if (leaderVertexIndex>=0 &&
                    leaderVertexIndex<maxLeaderVertices) {
                leaderVertices[3*leaderVertexIndex + (groupCode/10-1)]
                = toReal(groupValue);
            }
        }
        return true;
    }

    return false;
}



/**
 * Handles additional hatch data.
 */
bool DL_Dxf::handleHatchData(DL_CreationInterface* /*creationInterface*/) {

    static int firstPolylineStatus = 0;

    // Allocate hatch loops (group code 91):
    if (groupCode==91 && toInt(groupValue)>0) {

        //std::cout << "allocating " << toInt(groupValue) << " loops\n";

        if (hatchLoops!=NULL) {
            delete[] hatchLoops;
            hatchLoops = NULL;
        }
        if (maxHatchEdges!=NULL) {
            delete[] maxHatchEdges;
            maxHatchEdges = NULL;
        }
        if (hatchEdgeIndex!=NULL) {
            delete[] hatchEdgeIndex;
            hatchEdgeIndex = NULL;
        }
        if (hatchEdges!=NULL) {
            for (int i=0; i<maxHatchLoops; ++i) {
                delete[] hatchEdges[i];
            }
            delete[] hatchEdges;
            hatchEdges = NULL;
        }
        maxHatchLoops = toInt(groupValue);

        //std::cout << "maxHatchLoops: " << maxHatchLoops << "\n";

        if (maxHatchLoops>0) {
            hatchLoops = new DL_HatchLoopData[maxHatchLoops];
            maxHatchEdges = new int[maxHatchLoops];
            hatchEdgeIndex = new int[maxHatchLoops];
            hatchEdges = new DL_HatchEdgeData*[maxHatchLoops];
            //std::cout << "new hatchEdges[" << maxHatchLoops << "]\n";
            for (int i=0; i<maxHatchLoops; ++i) {
                hatchEdges[i] = NULL;
                //std::cout << "hatchEdges[" << i << "] = NULL\n";
                maxHatchEdges[i] = 0;
            }
            hatchLoopIndex = -1;
            dropEdges = false;
        }
        //std::cout << "done\n";
        return true;
    }

    // Allocate hatch edges, group code 93
    if (groupCode==93 && toInt(groupValue)>0) {
        if (hatchLoopIndex<maxHatchLoops-1 && hatchLoops!=NULL &&
                maxHatchEdges!=NULL && hatchEdgeIndex!=NULL &&
                hatchEdges!=NULL) {

            //std::cout << "  allocating " << toInt(groupValue) << " edges\n";
            dropEdges = false;

            hatchLoopIndex++;
            hatchLoops[hatchLoopIndex]
            = DL_HatchLoopData(toInt(groupValue));

            maxHatchEdges[hatchLoopIndex] = toInt(groupValue);
            hatchEdgeIndex[hatchLoopIndex] = -1;
            hatchEdges[hatchLoopIndex]
            = new DL_HatchEdgeData[toInt(groupValue)];

            //std::cout << "hatchEdges[" << hatchLoopIndex << "] = new "
            //  << toInt(groupValue) << "\n";
            firstPolylineStatus = 0;
        } else {
            //std::cout << "dropping " << toInt(groupValue) << " edges\n";
            dropEdges = true;
        }
        //std::cout << "done\n";
        return true;
    }

    // Init hatch edge for non-polyline boundary (group code 72)
    if (hatchEdges!=NULL &&
            hatchEdgeIndex!=NULL &&
            maxHatchEdges!=NULL &&
            hatchLoopIndex>=0 &&
            hatchLoopIndex<maxHatchLoops &&
            hatchEdgeIndex[hatchLoopIndex] <
            maxHatchEdges[hatchLoopIndex] &&
            (atoi(values[92])&2)==0 &&   // not a polyline
            groupCode==72 &&
            !dropEdges) {

        //std::cout << "Init hatch edge for non-polyline boundary\n";
        //std::cout << "hatchLoopIndex: " << hatchLoopIndex << "\n";
        //std::cout << "maxHatchLoops: " << maxHatchLoops << "\n";

        hatchEdgeIndex[hatchLoopIndex]++;

        //std::cout << "  init edge: type: "
        //<< toInt(groupValue)
        //<< " index: " << hatchEdgeIndex[hatchLoopIndex] << "\n";

        hatchEdges[hatchLoopIndex][hatchEdgeIndex[hatchLoopIndex]]
        .type = toInt(groupValue);
        hatchEdges[hatchLoopIndex][hatchEdgeIndex[hatchLoopIndex]]
        .defined = false;

        //std::cout << "done\n";
        return true;
    }

    // Handle hatch edges for non-polyline boundaries
    //   (group codes 10, 20, 11, 21, 40, 50, 51, 73)
    if (!dropEdges &&
            hatchEdges!=NULL &&
            hatchEdgeIndex!=NULL &&
            hatchLoopIndex>=0 &&
            hatchLoopIndex<maxHatchLoops &&
            hatchEdges[hatchLoopIndex]!=NULL &&
            hatchEdgeIndex[hatchLoopIndex]>=0 &&
            hatchEdgeIndex[hatchLoopIndex] <
            maxHatchEdges[hatchLoopIndex] &&
            ((atoi(values[92])&2)==0) &&        // not a polyline
            (groupCode==10 || groupCode==20 ||
             groupCode==11 || groupCode==21 ||
             groupCode==40 || groupCode==50 ||
             groupCode==51 || groupCode==73)) {

        //std::cout << "Handle hatch edge for non-polyline boundary\n";
        //std::cout << "  found edge data: " << groupCode << "\n";
        //std::cout << "     value: " << toReal(groupValue) << "\n";

        // can crash:
        //std::cout << "     defined: "
        //   << (int)hatchEdges[hatchLoopIndex]
        //   [hatchEdgeIndex[hatchLoopIndex]].defined << "\n";

        //std::cout << "92 flag: '" << values[92] << "'\n";
        //std::cout << "92 flag (int): '" << atoi(values[92]) << "'\n";

        if (hatchEdges[hatchLoopIndex]
                [hatchEdgeIndex[hatchLoopIndex]].defined==false) {
            if (hatchEdges[hatchLoopIndex]
                    [hatchEdgeIndex[hatchLoopIndex]].type==1) {
                switch (groupCode) {
                case 10:
                    hatchEdges[hatchLoopIndex]
                    [hatchEdgeIndex[hatchLoopIndex]].x1
                    = toReal(groupValue);
                    break;
                case 20:
                    hatchEdges[hatchLoopIndex]
                    [hatchEdgeIndex[hatchLoopIndex]].y1
                    = toReal(groupValue);
                    break;
                case 11:
                    hatchEdges[hatchLoopIndex]
                    [hatchEdgeIndex[hatchLoopIndex]].x2
                    = toReal(groupValue);
                    break;
                case 21:
                    hatchEdges[hatchLoopIndex]
                    [hatchEdgeIndex[hatchLoopIndex]].y2
                    = toReal(groupValue);
                    hatchEdges[hatchLoopIndex]
                    [hatchEdgeIndex[hatchLoopIndex]].defined = true;
                    break;
                default:
                    break;
                }
            }

            if (hatchEdges[hatchLoopIndex]
                    [hatchEdgeIndex[hatchLoopIndex]].type==2) {
                switch (groupCode) {
                case 10:
                    hatchEdges[hatchLoopIndex]
                    [hatchEdgeIndex[hatchLoopIndex]].cx
                    = toReal(groupValue);
                    break;
                case 20:
                    hatchEdges[hatchLoopIndex]
                    [hatchEdgeIndex[hatchLoopIndex]].cy
                    = toReal(groupValue);
                    break;
                case 40:
                    hatchEdges[hatchLoopIndex]
                    [hatchEdgeIndex[hatchLoopIndex]].radius
                    = toReal(groupValue);
                    break;
                case 50:
                    hatchEdges[hatchLoopIndex]
                    [hatchEdgeIndex[hatchLoopIndex]].angle1
                    = toReal(groupValue)/360.0*2*M_PI;
                    break;
                case 51:
                    hatchEdges[hatchLoopIndex]
                    [hatchEdgeIndex[hatchLoopIndex]].angle2
                    = toReal(groupValue)/360.0*2*M_PI;
                    break;
                case 73:
                    hatchEdges[hatchLoopIndex]
                    [hatchEdgeIndex[hatchLoopIndex]].ccw
                    = (bool)toInt(groupValue);
                    hatchEdges[hatchLoopIndex]
                    [hatchEdgeIndex[hatchLoopIndex]].defined = true;
                    break;
                default:
                    break;
                }
            }
        }
        return true;
    }

    /*
    // 2003/12/31: polyline hatches can be extremely slow and are rarely used
    //
       // Handle hatch edges for polyline boundaries
       //  (group codes 10, 20, 42)
       if (!dropEdges &&
               hatchEdges!=NULL &&
               hatchEdgeIndex!=NULL &&
               hatchLoopIndex>=0 &&
               hatchLoopIndex<maxHatchLoops &&
               hatchEdges[hatchLoopIndex]!=NULL &&
               //hatchEdgeIndex[hatchLoopIndex]>=0 &&
               hatchEdgeIndex[hatchLoopIndex] <
               maxHatchEdges[hatchLoopIndex] &&
               ((atoi(values[92])&2)==2)) {        // a polyline

           if (groupCode==10 || groupCode==20 ||
                   groupCode==42) {

               std::cout << "  found polyline edge data: " << groupCode << "\n";
               std::cout << "     value: " << toReal(groupValue) << "\n";

               static double lastX = 0.0;
               static double lastY = 0.0;
               static double lastB = 0.0;

               if (firstPolylineStatus<2) {
                   switch (groupCode) {
                   case 10:
                       firstPolylineStatus++;
                       if (firstPolylineStatus==1) {
                           lastX = toReal(groupValue);
                           std::cout << "     firstX: " << lastX << "\n";
                       }
                       break;

                   case 20:
                       lastY = toReal(groupValue);
                       std::cout << "     firstY: " << lastY << "\n";
                       break;

                   case 42:
                       lastB = toReal(groupValue);
                       break;

                   default:
                       break;
                   }

                   if (firstPolylineStatus!=2) {
                       return true;
                   }
               }


               switch (groupCode) {
               case 10:
                   hatchEdgeIndex[hatchLoopIndex]++;
                   hatchEdges[hatchLoopIndex]
                   [hatchEdgeIndex[hatchLoopIndex]].type = 1;
                   hatchEdges[hatchLoopIndex]
                   [hatchEdgeIndex[hatchLoopIndex]].x1
                   = lastX;
                   hatchEdges[hatchLoopIndex]
                   [hatchEdgeIndex[hatchLoopIndex]].x2
                   = lastX = toReal(groupValue);
                   std::cout << "     X: " << lastX << "\n";
                   break;
               case 20:
                   hatchEdges[hatchLoopIndex]
                   [hatchEdgeIndex[hatchLoopIndex]].y1
                   = lastY;
                   hatchEdges[hatchLoopIndex]
                   [hatchEdgeIndex[hatchLoopIndex]].y2
                   = lastY = toReal(groupValue);
                   std::cout << "     Y: " << lastY << "\n";
                   break;
                   / *
                               case 42: {
                   	// convert to arc:
                   	double x1 = hatchEdges[hatchLoopIndex]
                   		[hatchEdgeIndex[hatchLoopIndex]].x1;
                   	double y1 = hatchEdges[hatchLoopIndex]
                   		[hatchEdgeIndex[hatchLoopIndex]].y1;
                   	double x2 = hatchEdges[hatchLoopIndex]
                   		[hatchEdgeIndex[hatchLoopIndex]].x2;
                   	double y2 = hatchEdges[hatchLoopIndex]
                   		[hatchEdgeIndex[hatchLoopIndex]].y2;

                   	double bulge = toReal(groupValue);

                   	bool reversed = (bulge<0.0);
                   	double alpha = atan(bulge)*4.0;
                   	double radius;
                             double cx;
                             double cy;
                   	double a1;
                   	double a2;
                             double mx = (x2+x1)/2.0;
                             double my = (y2+y1)/2.0;
                   	double dist = sqrt(pow(x2-x1,2) + pow(y2-y1,2)) / 2.0;

                   	// alpha can't be 0.0 at this point
                             radius = fabs(dist / sin(alpha/2.0));

                             double wu = fabs(pow(radius, 2.0) - pow(dist, 2.0));
                             double h = sqrt(wu);
                   	double angle = acos((x2-x1) / dist);

                             if (bulge>0.0) {
                       		        angle+=M_PI/2.0;
                             } else {
                                 angle-=M_PI/2.0;
                             }

                             if (fabs(alpha)>M_PI) {
                                 h*=-1.0;
                             }

                   	cx = mx + cos(angle) * h;
                   	cy = my + sin(angle) * h;

                   	a1 = hatchEdges[hatchLoopIndex]
                                   	[hatchEdgeIndex[hatchLoopIndex]].type = 2;
                                   hatchEdges[hatchLoopIndex]
                                   	[hatchEdgeIndex[hatchLoopIndex]].ccw = (toReal(groupValue)>0.0);
                                   hatchEdges[hatchLoopIndex]
                                   	[hatchEdgeIndex[hatchLoopIndex]].cx = cx;
                                   hatchEdges[hatchLoopIndex]
                                   	[hatchEdgeIndex[hatchLoopIndex]].cy = cy;
                                   hatchEdges[hatchLoopIndex]
                                   	[hatchEdgeIndex[hatchLoopIndex]].radius = radius;
                                   } break;
                   	* /

               default:
                   break;
               }
           } else {
               // end polyline boundary
               dropEdges = true;
           }

           return true;
       }
    */

    return false;
}




/**
 * Adds an text entity that was read from the file via the creation interface.
 */
void DL_Dxf::addText(DL_CreationInterface* creationInterface) {
    DL_TextData d(
        // insertion point
        toReal(values[10], 0.0),
        toReal(values[20], 0.0),
        toReal(values[30], 0.0),
        // alignment point
        toReal(values[11], 0.0),
        toReal(values[21], 0.0),
        toReal(values[31], 0.0),
        // height
        toReal(values[40], 2.5),
        // x scale
        toReal(values[41], 1.0),
        // generation flags
        toInt(values[71], 0),
        // h just
        toInt(values[72], 0),
        // v just
        toInt(values[73], 0),
        // text
        values[1],
        // style
        values[7],
        // angle
        (toReal(values[50], 0.0)*2*M_PI)/360.0);

    creationInterface->addText(d);
}



/**
 * Adds an attrib entity that was read from the file via the creation interface.
 * @todo add attrib instead of normal text
 */
void DL_Dxf::addAttrib(DL_CreationInterface* creationInterface) {
    DL_TextData d(
        // insertion point
        toReal(values[10], 0.0),
        toReal(values[20], 0.0),
        toReal(values[30], 0.0),
        // alignment point
        toReal(values[11], 0.0),
        toReal(values[21], 0.0),
        toReal(values[31], 0.0),
        // height
        toReal(values[40], 2.5),
        // x scale
        toReal(values[41], 1.0),
        // generation flags
        toInt(values[71], 0),
        // h just
        toInt(values[72], 0),
        // v just
        toInt(values[74], 0),
        // text
        values[1],
        // style
        values[7],
        // angle
        (toReal(values[50], 0.0)*2*M_PI)/360.0);

    creationInterface->addText(d);
}



/**
 * @return dimension data from current values.
 */
DL_DimensionData DL_Dxf::getDimData() {
    // generic dimension data:
    return DL_DimensionData(
               // def point
               toReal(values[10], 0.0),
               toReal(values[20], 0.0),
               toReal(values[30], 0.0),
               // text middle point
               toReal(values[11], 0.0),
               toReal(values[21], 0.0),
               toReal(values[31], 0.0),
               // type
               toInt(values[70], 0),
               // attachment point
               toInt(values[71], 5),
               // line sp. style
               toInt(values[72], 1),
               // line sp. factor
               toReal(values[41], 1.0),
               // text
               values[1],
               // style
               values[3],
               // angle
               toReal(values[53], 0.0));
}



/**
 * Adds a linear dimension entity that was read from the file via the creation interface.
 */
void DL_Dxf::addDimLinear(DL_CreationInterface* creationInterface) {
    DL_DimensionData d = getDimData();

    // horizontal / vertical / rotated dimension:
    DL_DimLinearData dl(
        // definition point 1
        toReal(values[13], 0.0),
        toReal(values[23], 0.0),
        toReal(values[33], 0.0),
        // definition point 2
        toReal(values[14], 0.0),
        toReal(values[24], 0.0),
        toReal(values[34], 0.0),
        // angle
        toReal(values[50], 0.0),
        // oblique
        toReal(values[52], 0.0));
    creationInterface->addDimLinear(d, dl);
}



/**
 * Adds an aligned dimension entity that was read from the file via the creation interface.
 */
void DL_Dxf::addDimAligned(DL_CreationInterface* creationInterface) {
    DL_DimensionData d = getDimData();

    // aligned dimension:
    DL_DimAlignedData da(
        // extension point 1
        toReal(values[13], 0.0),
        toReal(values[23], 0.0),
        toReal(values[33], 0.0),
        // extension point 2
        toReal(values[14], 0.0),
        toReal(values[24], 0.0),
        toReal(values[34], 0.0));
    creationInterface->addDimAlign(d, da);
}



/**
 * Adds a radial dimension entity that was read from the file via the creation interface.
 */
void DL_Dxf::addDimRadial(DL_CreationInterface* creationInterface) {
    DL_DimensionData d = getDimData();

    DL_DimRadialData dr(
        // definition point
        toReal(values[15], 0.0),
        toReal(values[25], 0.0),
        toReal(values[35], 0.0),
        // leader length:
        toReal(values[40], 0.0));
    creationInterface->addDimRadial(d, dr);
}



/**
 * Adds a diametric dimension entity that was read from the file via the creation interface.
 */
void DL_Dxf::addDimDiametric(DL_CreationInterface* creationInterface) {
    DL_DimensionData d = getDimData();

    // diametric dimension:
    DL_DimDiametricData dr(
        // definition point
        toReal(values[15], 0.0),
        toReal(values[25], 0.0),
        toReal(values[35], 0.0),
        // leader length:
        toReal(values[40], 0.0));
    creationInterface->addDimDiametric(d, dr);
}



/**
 * Adds an angular dimension entity that was read from the file via the creation interface.
 */
void DL_Dxf::addDimAngular(DL_CreationInterface* creationInterface) {
    DL_DimensionData d = getDimData();

    // angular dimension:
    DL_DimAngularData da(
        // definition point 1
        toReal(values[13], 0.0),
        toReal(values[23], 0.0),
        toReal(values[33], 0.0),
        // definition point 2
        toReal(values[14], 0.0),
        toReal(values[24], 0.0),
        toReal(values[34], 0.0),
        // definition point 3
        toReal(values[15], 0.0),
        toReal(values[25], 0.0),
        toReal(values[35], 0.0),
        // definition point 4
        toReal(values[16], 0.0),
        toReal(values[26], 0.0),
        toReal(values[36], 0.0));
    creationInterface->addDimAngular(d, da);
}


/**
 * Adds an angular dimension entity that was read from the file via the creation interface.
 */
void DL_Dxf::addDimAngular3P(DL_CreationInterface* creationInterface) {
    DL_DimensionData d = getDimData();

    // angular dimension (3P):
    DL_DimAngular3PData da(
        // definition point 1
        toReal(values[13], 0.0),
        toReal(values[23], 0.0),
        toReal(values[33], 0.0),
        // definition point 2
        toReal(values[14], 0.0),
        toReal(values[24], 0.0),
        toReal(values[34], 0.0),
        // definition point 3
        toReal(values[15], 0.0),
        toReal(values[25], 0.0),
        toReal(values[35], 0.0));
    creationInterface->addDimAngular3P(d, da);
}



/**
 * Adds a leader entity that was read from the file via the creation interface.
 */
void DL_Dxf::addLeader(DL_CreationInterface* creationInterface) {
    // leader (arrow)
    DL_LeaderData le(
        // arrow head flag
        toInt(values[71], 1),
        // leader path type
        toInt(values[72], 0),
        // Leader creation flag
        toInt(values[73], 3),
        // Hookline direction flag
        toInt(values[74], 1),
        // Hookline flag
        toInt(values[75], 0),
        // Text annotation height
        toReal(values[40], 1.0),
        // Text annotation width
        toReal(values[41], 1.0),
        // Number of vertices in leader
        toInt(values[76], 0)
    );
    creationInterface->addLeader(le);

    for (int i=0; i<maxLeaderVertices; i++) {
        DL_LeaderVertexData d(leaderVertices[i*3],
                              leaderVertices[i*3+1],
                              leaderVertices[i*3+2]);

        creationInterface->addLeaderVertex(d);
    }
}



/**
 * Adds a hatch entity that was read from the file via the creation interface.
 */
void DL_Dxf::addHatch(DL_CreationInterface* creationInterface) {
    DL_HatchData hd(toInt(values[91], 1),
                    toInt(values[70], 0),
                    toReal(values[41], 1.0),
                    toReal(values[52], 0.0),
                    values[2]);
    creationInterface->addHatch(hd);

    for (int l=0; l<maxHatchLoops; l++) {
        DL_HatchLoopData ld(maxHatchEdges[l]);
        creationInterface->addHatchLoop(ld);
        for (int b=0; b<maxHatchEdges[l]; b++) {
            creationInterface->addHatchEdge(hatchEdges[l][b]);
        }
    }
    creationInterface->endEntity();
    currentEntity = DL_UNKNOWN;
}



/**
 * Adds an image entity that was read from the file via the creation interface.
 */
void DL_Dxf::addImage(DL_CreationInterface* creationInterface) {
    DL_ImageData id(// pass ref insead of name we don't have yet
        values[340],
        // ins point:
        toReal(values[10], 0.0),
        toReal(values[20], 0.0),
        toReal(values[30], 0.0),
        // u vector:
        toReal(values[11], 1.0),
        toReal(values[21], 0.0),
        toReal(values[31], 0.0),
        // v vector:
        toReal(values[12], 0.0),
        toReal(values[22], 1.0),
        toReal(values[32], 0.0),
        // image size (pixel):
        toInt(values[13], 1),
        toInt(values[23], 1),
        // brightness, contrast, fade
        toInt(values[281], 50),
        toInt(values[282], 50),
        toInt(values[283], 0));

    creationInterface->addImage(id);
    creationInterface->endEntity();
    currentEntity = DL_UNKNOWN;
}



/**
 * Adds an image definition that was read from the file via the creation interface.
 */
void DL_Dxf::addImageDef(DL_CreationInterface* creationInterface) {
    DL_ImageDefData id(// handle
        values[5],
        values[1]);

    creationInterface->linkImage(id);
    creationInterface->endEntity();
    currentEntity = DL_UNKNOWN;
}



/**
 * Ends some special entities like hatches or old style polylines.
 */
void DL_Dxf::endEntity(DL_CreationInterface* creationInterface) {
	creationInterface->endEntity();
}


/**
 * Ends a sequence and notifies the creation interface.
 */
void DL_Dxf::endSequence(DL_CreationInterface* creationInterface) {
    creationInterface->endSequence();
}


/**
 * Converts the given string into an int.
 * ok is set to false if there was an error.
 */
int DL_Dxf::stringToInt(const char* s, bool* ok) {
    if (ok!=NULL) {
        // check string:
        *ok = true;
        int i=0;
        bool dot = false;
        do {
            if (s[i]=='\0') {
                break;
            } else if (s[i]=='.') {
                if (dot==true) {
                    //std::cerr << "two dots\n";
                    *ok = false;
                } else {
                    dot = true;
                }
            } else if (s[i]<'0' || s[i]>'9') {
                //std::cerr << "NaN: '" << s[i] << "'\n";
                *ok = false;
            }
            i++;
        } while(s[i]!='\0' && *ok==true);
    }

    return atoi(s);
}


/**
 * @brief Opens the given file for writing and returns a pointer
 * to the dxf writer. This pointer needs to be passed on to other
 * writing functions.
 *
 * @param file Full path of the file to open.
 *
 * @return Pointer to an ascii dxf writer object.
 */
DL_WriterA* DL_Dxf::out(const char* file, DL_Codes::version version) {
    char* f = new char[strlen(file)+1];
    strcpy(f, file);
    this->version = version;

    DL_WriterA* dw = new DL_WriterA(f, version);
    if (dw->openFailed()) {
        delete dw;
        delete[] f;
        return NULL;
    } else {
        delete[] f;
        return dw;
    }
}



/**
 * @brief Writes a DXF header to the file currently opened 
 * by the given DXF writer object.
 */
void DL_Dxf::writeHeader(DL_WriterA& dw) {
    dw.comment("dxflib " DL_VERSION);
    dw.sectionHeader();

    dw.dxfString(9, "$ACADVER");
    switch (version) {
    case DL_Codes::AC1009:
        dw.dxfString(1, "AC1009");
        break;
    case DL_Codes::AC1012:
        dw.dxfString(1, "AC1012");
        break;
    case DL_Codes::AC1014:
        dw.dxfString(1, "AC1014");
        break;
    case DL_Codes::AC1015:
        dw.dxfString(1, "AC1015");
        break;
    }

    // Newer version require that (otherwise a*cad crashes..)
    if (version==VER_2000) {
        dw.dxfString(9, "$HANDSEED");
        dw.dxfHex(5, 0xFFFF);
    }

    //dw.sectionEnd();
}




/**
 * Writes a point entity to the file.
 *
 * @param dw DXF writer
 * @param data Entity data from the file
 * @param attrib Attributes
 */
void DL_Dxf::writePoint(DL_WriterA& dw,
                        const DL_PointData& data,
                        const DL_Attributes& attrib) {
    dw.entity("POINT");
    if (version==VER_2000) {
        dw.dxfString(100, "AcDbEntity");
        dw.dxfString(100, "AcDbPoint");
    }
    dw.entityAttributes(attrib);
    dw.coord(POINT_COORD_CODE, data.x, data.y);
}



/**
 * Writes a line entity to the file.
 *
 * @param dw DXF writer
 * @param data Entity data from the file
 * @param attrib Attributes
 */
void DL_Dxf::writeLine(DL_WriterA& dw,
                       const DL_LineData& data,
                       const DL_Attributes& attrib) {
    dw.entity("LINE");
    if (version==VER_2000) {
        dw.dxfString(100, "AcDbEntity");
        dw.dxfString(100, "AcDbLine");
    }
    dw.entityAttributes(attrib);
    dw.coord(LINE_START_CODE, data.x1, data.y1);
    dw.coord(LINE_END_CODE, data.x2, data.y2);
}



/**
 * Writes a polyline entity to the file.
 *
 * @param dw DXF writer
 * @param data Entity data from the file
 * @param attrib Attributes
 * @see writeVertex
 */
void DL_Dxf::writePolyline(DL_WriterA& dw,
                           const DL_PolylineData& data,
                           const DL_Attributes& attrib) {
    if (version==VER_2000) {
        dw.entity("LWPOLYLINE");
        dw.entityAttributes(attrib);
        dw.dxfString(100, "AcDbEntity");
        dw.dxfString(100, "AcDbPolyline");
        dw.dxfInt(90, (int)data.number);
        dw.dxfInt(70, data.flags);
    } else {
        dw.entity("POLYLINE");
        dw.entityAttributes(attrib);
		polylineLayer = attrib.getLayer();
        dw.dxfInt(66, 1);
        dw.dxfInt(70, data.flags);
        dw.coord(VERTEX_COORD_CODE, 0.0, 0.0);
    }
}



/**
 * Writes a single vertex of a polyline to the file.
 *
 * @param dw DXF writer
 * @param data Entity data from the file
 * @param attrib Attributes
 */
void DL_Dxf::writeVertex(DL_WriterA& dw,
                         const DL_VertexData& data) {


    if (version==VER_2000) {
        dw.dxfReal(10, data.x);
        dw.dxfReal(20, data.y);
        if (fabs(data.bulge)>1.0e-10) {
            dw.dxfReal(42, data.bulge);
        }
    } else {
        dw.entity("VERTEX");
        //dw.entityAttributes(attrib);
    	dw.dxfString(8, polylineLayer);
        dw.coord(VERTEX_COORD_CODE, data.x, data.y);
        if (fabs(data.bulge)>1.0e-10) {
            dw.dxfReal(42, data.bulge);
        }
    }
}

    
	
/**
 * Writes the polyline end. Only needed for DXF R12.
 */
void DL_Dxf::writePolylineEnd(DL_WriterA& dw) {
    if (version==VER_2000) {
    } else {
        dw.entity("SEQEND");
    }
}


/**
 * Writes a spline entity to the file.
 *
 * @param dw DXF writer
 * @param data Entity data from the file
 * @param attrib Attributes
 * @see writeControlPoint
 */
void DL_Dxf::writeSpline(DL_WriterA& dw,
                         const DL_SplineData& data,
                         const DL_Attributes& attrib) {

    dw.entity("SPLINE");
    dw.entityAttributes(attrib);
    if (version==VER_2000) {
        dw.dxfString(100, "AcDbEntity");
        dw.dxfString(100, "AcDbSpline");
    }
    dw.dxfInt(70, data.flags);
    dw.dxfInt(71, data.degree);
    dw.dxfInt(72, data.nKnots);            // number of knots
    dw.dxfInt(73, data.nControl);          // number of control points
    dw.dxfInt(74, 0);                      // number of fit points
}



/**
 * Writes a single control point of a spline to the file.
 *
 * @param dw DXF writer
 * @param data Entity data from the file
 * @param attrib Attributes
 */
void DL_Dxf::writeControlPoint(DL_WriterA& dw,
                               const DL_ControlPointData& data) {

    dw.dxfReal(10, data.x);
    dw.dxfReal(20, data.y);
    dw.dxfReal(30, data.z);
}



/**
 * Writes a single knot of a spline to the file.
 *
 * @param dw DXF writer
 * @param data Entity data from the file
 * @param attrib Attributes
 */
void DL_Dxf::writeKnot(DL_WriterA& dw,
                       const DL_KnotData& data) {

    dw.dxfReal(40, data.k);
}



/**
 * Writes a circle entity to the file.
 *
 * @param dw DXF writer
 * @param data Entity data from the file
 * @param attrib Attributes
 */
void DL_Dxf::writeCircle(DL_WriterA& dw,
                         const DL_CircleData& data,
                         const DL_Attributes& attrib) {
    dw.entity("CIRCLE");
    if (version==VER_2000) {
        dw.dxfString(100, "AcDbEntity");
        dw.dxfString(100, "AcDbCircle");
    }
    dw.entityAttributes(attrib);
    dw.coord(10, data.cx, data.cy);
    dw.dxfReal(40, data.radius);
}



/**
 * Writes an arc entity to the file.
 *
 * @param dw DXF writer
 * @param data Entity data from the file
 * @param attrib Attributes
 */
void DL_Dxf::writeArc(DL_WriterA& dw,
                      const DL_ArcData& data,
                      const DL_Attributes& attrib) {
    dw.entity("ARC");
    if (version==VER_2000) {
        dw.dxfString(100, "AcDbEntity");
    }
    dw.entityAttributes(attrib);
    if (version==VER_2000) {
        dw.dxfString(100, "AcDbCircle");
    }
    dw.coord(10, data.cx, data.cy);
    dw.dxfReal(40, data.radius);
    if (version==VER_2000) {
        dw.dxfString(100, "AcDbArc");
    }
    dw.dxfReal(50, data.angle1);
    dw.dxfReal(51, data.angle2);
}



/**
 * Writes an ellipse entity to the file.
 *
 * @param dw DXF writer
 * @param data Entity data from the file
 * @param attrib Attributes
 */
void DL_Dxf::writeEllipse(DL_WriterA& dw,
                          const DL_EllipseData& data,
                          const DL_Attributes& attrib) {

    if (version>VER_R12) {
        dw.entity("ELLIPSE");
        if (version==VER_2000) {
            dw.dxfString(100, "AcDbEntity");
            dw.dxfString(100, "AcDbEllipse");
        }
        dw.entityAttributes(attrib);
        dw.coord(10, data.cx, data.cy);
        dw.coord(11, data.mx, data.my);
        dw.dxfReal(40, data.ratio);
        dw.dxfReal(41, data.angle1);
        dw.dxfReal(42, data.angle2);
    }
}



/**
 * Writes an insert to the file.
 *
 * @param dw DXF writer
 * @param data Entity data from the file
 * @param attrib Attributes
 */
void DL_Dxf::writeInsert(DL_WriterA& dw,
                         const DL_InsertData& data,
                         const DL_Attributes& attrib) {

    if (data.name.empty()) {
        std::cerr << "DL_Dxf::writeInsert: "
        << "Block name must not be empty\n";
        return;
    }

    dw.entity("INSERT");
    if (version==VER_2000) {
        dw.dxfString(100, "AcDbEntity");
        dw.dxfString(100, "AcDbBlockReference");
    }
    dw.entityAttributes(attrib);
    dw.dxfString(2, data.name);
    dw.dxfReal(10, data.ipx);
    dw.dxfReal(20, data.ipy);
    dw.dxfReal(30, 0.0);
    if (data.sx!=1.0 || data.sy!=1.0) {
        dw.dxfReal(41, data.sx);
        dw.dxfReal(42, data.sy);
        dw.dxfReal(43, 1.0);
    }
    if (data.angle!=0.0) {
        dw.dxfReal(50, data.angle);
    }
    if (data.cols!=1 || data.rows!=1) {
        dw.dxfInt(70, data.cols);
        dw.dxfInt(71, data.rows);
    }
    if (data.colSp!=0.0 || data.rowSp!=0.0) {
        dw.dxfReal(44, data.colSp);
        dw.dxfReal(45, data.rowSp);
    }

}



/**
 * Writes a multi text entity to the file.
 *
 * @param dw DXF writer
 * @param data Entity data from the file
 * @param attrib Attributes
 */
void DL_Dxf::writeMText(DL_WriterA& dw,
                        const DL_MTextData& data,
                        const DL_Attributes& attrib) {

    dw.entity("MTEXT");
    if (version==VER_2000) {
        dw.dxfString(100, "AcDbEntity");
        dw.dxfString(100, "AcDbMText");
    }
    dw.entityAttributes(attrib);
    dw.dxfReal(10, data.ipx);
    dw.dxfReal(20, data.ipy);
    dw.dxfReal(30, 0.0);
    dw.dxfReal(40, data.height);
    dw.dxfReal(41, data.width);

    dw.dxfInt(71, data.attachmentPoint);
    dw.dxfInt(72, data.drawingDirection);

    // Creare text chunks of 250 characters each:
    int length = data.text.length();
    char chunk[251];
    int i;
    for (i=250; i<length; i+=250) {
        strncpy(chunk, &data.text.c_str()[i-250], 250);
        chunk[250]='\0';
        dw.dxfString(3, chunk);
    }
    strncpy(chunk, &data.text.c_str()[i-250], 250);
    chunk[250]='\0';
    dw.dxfString(1, chunk);

    dw.dxfString(7, data.style);

    // since dxflib 2.0.2.1: degrees not rad (error in autodesk dxf doc)
    dw.dxfReal(50, data.angle/(2.0*M_PI)*360.0);

    dw.dxfInt(73, data.lineSpacingStyle);
    dw.dxfReal(44, data.lineSpacingFactor);
}



/**
 * Writes a text entity to the file.
 *
 * @param dw DXF writer
 * @param data Entity data from the file
 * @param attrib Attributes
 */
void DL_Dxf::writeText(DL_WriterA& dw,
                       const DL_TextData& data,
                       const DL_Attributes& attrib) {

    dw.entity("TEXT");
    if (version==VER_2000) {
        dw.dxfString(100, "AcDbEntity");
        dw.dxfString(100, "AcDbText");
    }
    dw.entityAttributes(attrib);
    dw.dxfReal(10, data.ipx);
    dw.dxfReal(20, data.ipy);
    dw.dxfReal(30, 0.0);
    dw.dxfReal(40, data.height);
    dw.dxfString(1, data.text);
    dw.dxfReal(50, data.angle/(2*M_PI)*360.0);
    dw.dxfReal(41, data.xScaleFactor);
    dw.dxfString(7, data.style);

    dw.dxfInt(71, data.textGenerationFlags);
    dw.dxfInt(72, data.hJustification);

    dw.dxfReal(11, data.apx);
    dw.dxfReal(21, data.apy);
    dw.dxfReal(31, 0.0);

    dw.dxfInt(73, data.vJustification);
}


/**
 * Writes an aligned dimension entity to the file.
 *
 * @param dw DXF writer
 * @param data Generic dimension data for from the file
 * @param data Specific aligned dimension data from the file
 * @param attrib Attributes
 */
void DL_Dxf::writeDimAligned(DL_WriterA& dw,
                             const DL_DimensionData& data,
                             const DL_DimAlignedData& edata,
                             const DL_Attributes& attrib) {

    dw.entity("DIMENSION");

    if (version==VER_2000) {
        dw.dxfString(100, "AcDbEntity");
    }
    dw.entityAttributes(attrib);
    if (version==VER_2000) {
        dw.dxfString(100, "AcDbDimension");
    }

    dw.dxfReal(10, data.dpx);
    dw.dxfReal(20, data.dpy);
    dw.dxfReal(30, 0.0);

    dw.dxfReal(11, data.mpx);
    dw.dxfReal(21, data.mpy);
    dw.dxfReal(31, 0.0);

    dw.dxfInt(70, 1);
    if (version>VER_R12) {
        dw.dxfInt(71, data.attachmentPoint);
        dw.dxfInt(72, data.lineSpacingStyle); // opt
        dw.dxfReal(41, data.lineSpacingFactor); // opt
    }

    dw.dxfReal(42, data.angle);

    dw.dxfString(1, data.text);   // opt
    //dw.dxfString(3, data.style);
    dw.dxfString(3, "Standard");

    if (version==VER_2000) {
        dw.dxfString(100, "AcDbAlignedDimension");
    }

    dw.dxfReal(13, edata.epx1);
    dw.dxfReal(23, edata.epy1);
    dw.dxfReal(33, 0.0);

    dw.dxfReal(14, edata.epx2);
    dw.dxfReal(24, edata.epy2);
    dw.dxfReal(34, 0.0);
}



/**
 * Writes a linear dimension entity to the file.
 *
 * @param dw DXF writer
 * @param data Generic dimension data for from the file
 * @param data Specific linear dimension data from the file
 * @param attrib Attributes
 */
void DL_Dxf::writeDimLinear(DL_WriterA& dw,
                            const DL_DimensionData& data,
                            const DL_DimLinearData& edata,
                            const DL_Attributes& attrib) {

    dw.entity("DIMENSION");

    if (version==VER_2000) {
        dw.dxfString(100, "AcDbEntity");
    }
    dw.entityAttributes(attrib);
    if (version==VER_2000) {
        dw.dxfString(100, "AcDbDimension");
    }

    dw.dxfReal(10, data.dpx);
    dw.dxfReal(20, data.dpy);
    dw.dxfReal(30, 0.0);

    dw.dxfReal(11, data.mpx);
    dw.dxfReal(21, data.mpy);
    dw.dxfReal(31, 0.0);

    dw.dxfInt(70, 0);
    if (version>VER_R12) {
        dw.dxfInt(71, data.attachmentPoint);
        dw.dxfInt(72, data.lineSpacingStyle); // opt
        dw.dxfReal(41, data.lineSpacingFactor); // opt
    }

    dw.dxfReal(42, data.angle);

    dw.dxfString(1, data.text);   // opt
    //dw.dxfString(3, data.style);
    dw.dxfString(3, "Standard");

    if (version==VER_2000) {
        dw.dxfString(100, "AcDbAlignedDimension");
    }

    dw.dxfReal(13, edata.dpx1);
    dw.dxfReal(23, edata.dpy1);
    dw.dxfReal(33, 0.0);

    dw.dxfReal(14, edata.dpx2);
    dw.dxfReal(24, edata.dpy2);
    dw.dxfReal(34, 0.0);

    dw.dxfReal(50, edata.angle/(2.0*M_PI)*360.0);

    if (version==VER_2000) {
        dw.dxfString(100, "AcDbRotatedDimension");
        /*
        dw.dxfString(1001, "ACAD");
        dw.dxfString(1000, "DSTYLE");
        dw.dxfString(1002, "{");
        dw.dxfInt(1070, 340);
        dw.dxfInt(1005, 11);
        dw.dxfString(1002, "}");
        */
    }
}



/**
 * Writes a radial dimension entity to the file.
 *
 * @param dw DXF writer
 * @param data Generic dimension data for from the file
 * @param data Specific radial dimension data from the file
 * @param attrib Attributes
 */
void DL_Dxf::writeDimRadial(DL_WriterA& dw,
                            const DL_DimensionData& data,
                            const DL_DimRadialData& edata,
                            const DL_Attributes& attrib) {

    dw.entity("DIMENSION");

    if (version==VER_2000) {
        dw.dxfString(100, "AcDbEntity");
    }
    dw.entityAttributes(attrib);
    if (version==VER_2000) {
        dw.dxfString(100, "AcDbDimension");
    }

    dw.dxfReal(10, data.dpx);
    dw.dxfReal(20, data.dpy);
    dw.dxfReal(30, 0.0);

    dw.dxfReal(11, data.mpx);
    dw.dxfReal(21, data.mpy);
    dw.dxfReal(31, 0.0);

    dw.dxfInt(70, 4);
    if (version>VER_R12) {
        dw.dxfInt(71, data.attachmentPoint);
        dw.dxfInt(72, data.lineSpacingStyle); // opt
        dw.dxfReal(41, data.lineSpacingFactor); // opt
    }

    dw.dxfReal(42, data.angle);

    dw.dxfString(1, data.text);   // opt
    //dw.dxfString(3, data.style);
    dw.dxfString(3, "Standard");

    if (version==VER_2000) {
        dw.dxfString(100, "AcDbRadialDimension");
    }

    dw.dxfReal(15, edata.dpx);
    dw.dxfReal(25, edata.dpy);
    dw.dxfReal(35, 0.0);

    dw.dxfReal(40, edata.leader);
}



/**
 * Writes a diametric dimension entity to the file.
 *
 * @param dw DXF writer
 * @param data Generic dimension data for from the file
 * @param data Specific diametric dimension data from the file
 * @param attrib Attributes
 */
void DL_Dxf::writeDimDiametric(DL_WriterA& dw,
                               const DL_DimensionData& data,
                               const DL_DimDiametricData& edata,
                               const DL_Attributes& attrib) {

    dw.entity("DIMENSION");

    if (version==VER_2000) {
        dw.dxfString(100, "AcDbEntity");
    }
    dw.entityAttributes(attrib);
    if (version==VER_2000) {
        dw.dxfString(100, "AcDbDimension");
    }

    dw.dxfReal(10, data.dpx);
    dw.dxfReal(20, data.dpy);
    dw.dxfReal(30, 0.0);

    dw.dxfReal(11, data.mpx);
    dw.dxfReal(21, data.mpy);
    dw.dxfReal(31, 0.0);

    dw.dxfInt(70, 3);
    if (version>VER_R12) {
        dw.dxfInt(71, data.attachmentPoint);
        dw.dxfInt(72, data.lineSpacingStyle); // opt
        dw.dxfReal(41, data.lineSpacingFactor); // opt
    }

    dw.dxfReal(42, data.angle);

    dw.dxfString(1, data.text);   // opt
    //dw.dxfString(3, data.style);
    dw.dxfString(3, "Standard");

    if (version==VER_2000) {
        dw.dxfString(100, "AcDbDiametricDimension");
    }

    dw.dxfReal(15, edata.dpx);
    dw.dxfReal(25, edata.dpy);
    dw.dxfReal(35, 0.0);

    dw.dxfReal(40, edata.leader);
}



/**
 * Writes an angular dimension entity to the file.
 *
 * @param dw DXF writer
 * @param data Generic dimension data for from the file
 * @param data Specific angular dimension data from the file
 * @param attrib Attributes
 */
void DL_Dxf::writeDimAngular(DL_WriterA& dw,
                             const DL_DimensionData& data,
                             const DL_DimAngularData& edata,
                             const DL_Attributes& attrib) {

    dw.entity("DIMENSION");

    if (version==VER_2000) {
        dw.dxfString(100, "AcDbEntity");
    }
    dw.entityAttributes(attrib);
    if (version==VER_2000) {
        dw.dxfString(100, "AcDbDimension");
    }

    dw.dxfReal(10, data.dpx);
    dw.dxfReal(20, data.dpy);
    dw.dxfReal(30, 0.0);

    dw.dxfReal(11, data.mpx);
    dw.dxfReal(21, data.mpy);
    dw.dxfReal(31, 0.0);

    dw.dxfInt(70, 2);
    if (version>VER_R12) {
        dw.dxfInt(71, data.attachmentPoint);
        dw.dxfInt(72, data.lineSpacingStyle); // opt
        dw.dxfReal(41, data.lineSpacingFactor); // opt
    }

    dw.dxfReal(42, data.angle);

    dw.dxfString(1, data.text);   // opt
    //dw.dxfString(3, data.style);
    dw.dxfString(3, "Standard");

    if (version==VER_2000) {
        dw.dxfString(100, "AcDb2LineAngularDimension");
    }

    dw.dxfReal(13, edata.dpx1);
    dw.dxfReal(23, edata.dpy1);
    dw.dxfReal(33, 0.0);

    dw.dxfReal(14, edata.dpx2);
    dw.dxfReal(24, edata.dpy2);
    dw.dxfReal(34, 0.0);

    dw.dxfReal(15, edata.dpx3);
    dw.dxfReal(25, edata.dpy3);
    dw.dxfReal(35, 0.0);

    dw.dxfReal(16, edata.dpx4);
    dw.dxfReal(26, edata.dpy4);
    dw.dxfReal(36, 0.0);
}



/**
 * Writes an angular dimension entity (3 points version) to the file.
 *
 * @param dw DXF writer
 * @param data Generic dimension data for from the file
 * @param data Specific angular dimension data from the file
 * @param attrib Attributes
 */
void DL_Dxf::writeDimAngular3P(DL_WriterA& dw,
                               const DL_DimensionData& data,
                               const DL_DimAngular3PData& edata,
                               const DL_Attributes& attrib) {

    dw.entity("DIMENSION");

    if (version==VER_2000) {
        dw.dxfString(100, "AcDbEntity");
    }
    dw.entityAttributes(attrib);
    if (version==VER_2000) {
        dw.dxfString(100, "AcDbDimension");
    }

    dw.dxfReal(10, data.dpx);
    dw.dxfReal(20, data.dpy);
    dw.dxfReal(30, 0.0);

    dw.dxfReal(11, data.mpx);
    dw.dxfReal(21, data.mpy);
    dw.dxfReal(31, 0.0);

    dw.dxfInt(70, 5);
    if (version>VER_R12) {
        dw.dxfInt(71, data.attachmentPoint);
        dw.dxfInt(72, data.lineSpacingStyle); // opt
        dw.dxfReal(41, data.lineSpacingFactor); // opt
    }

    dw.dxfReal(42, data.angle);

    dw.dxfString(1, data.text);   // opt
    //dw.dxfString(3, data.style);
    dw.dxfString(3, "Standard");

    if (version==VER_2000) {
        dw.dxfString(100, "AcDb3PointAngularDimension");
    }

    dw.dxfReal(13, edata.dpx1);
    dw.dxfReal(23, edata.dpy1);
    dw.dxfReal(33, 0.0);

    dw.dxfReal(14, edata.dpx2);
    dw.dxfReal(24, edata.dpy2);
    dw.dxfReal(34, 0.0);

    dw.dxfReal(15, edata.dpx3);
    dw.dxfReal(25, edata.dpy3);
    dw.dxfReal(35, 0.0);
}



/**
 * Writes a leader entity to the file.
 *
 * @param dw DXF writer
 * @param data Entity data from the file
 * @param attrib Attributes
 * @see writeVertex
 */
void DL_Dxf::writeLeader(DL_WriterA& dw,
                         const DL_LeaderData& data,
                         const DL_Attributes& attrib) {
    if (version>VER_R12) {
        dw.entity("LEADER");
        dw.entityAttributes(attrib);
        if (version==VER_2000) {
            dw.dxfString(100, "AcDbEntity");
            dw.dxfString(100, "AcDbLeader");
        }
        dw.dxfString(3, "Standard");
        dw.dxfInt(71, data.arrowHeadFlag);
        dw.dxfInt(72, data.leaderPathType);
        dw.dxfInt(73, data.leaderCreationFlag);
        dw.dxfInt(74, data.hooklineDirectionFlag);
        dw.dxfInt(75, data.hooklineFlag);
        dw.dxfReal(40, data.textAnnotationHeight);
        dw.dxfReal(41, data.textAnnotationWidth);
        dw.dxfInt(76, data.number);
    }
}



/**
 * Writes a single vertex of a leader to the file.
 *
 * @param dw DXF writer
 * @param data Entity data
 */
void DL_Dxf::writeLeaderVertex(DL_WriterA& dw,
                               const DL_LeaderVertexData& data) {
    if (version>VER_R12) {
        dw.dxfReal(10, data.x);
        dw.dxfReal(20, data.y);
    }
}



/**
 * Writes the beginning of a hatch entity to the file.
 * This must be followed by one or more writeHatchLoop()
 * calls and a writeHatch2() call.
 *
 * @param dw DXF writer
 * @param data Entity data.
 * @param attrib Attributes
 */
void DL_Dxf::writeHatch1(DL_WriterA& dw,
                         const DL_HatchData& data,
                         const DL_Attributes& attrib) {

    dw.entity("HATCH");
    dw.entityAttributes(attrib);
    if (version==VER_2000) {
        dw.dxfString(100, "AcDbEntity");
        dw.dxfString(100, "AcDbHatch");
    }
    dw.dxfReal(10, 0.0);             // elevation
    dw.dxfReal(20, 0.0);
    dw.dxfReal(30, 0.0);
    dw.dxfReal(210, 0.0);             // extrusion dir.
    dw.dxfReal(220, 0.0);
    dw.dxfReal(230, 1.0);
    if (data.solid==false) {
        dw.dxfString(2, data.pattern);
    } else {
        dw.dxfString(2, "SOLID");
    }
    dw.dxfInt(70, (int)data.solid);
    dw.dxfInt(71, 0);                // associative
    dw.dxfInt(91, data.numLoops);
}



/**
 * Writes the end of a hatch entity to the file.
 *
 * @param dw DXF writer
 * @param data Entity data.
 * @param attrib Attributes
 */
void DL_Dxf::writeHatch2(DL_WriterA& dw,
                         const DL_HatchData& data,
                         const DL_Attributes& /*attrib*/) {

    dw.dxfInt(75, 0);                // odd parity
    dw.dxfInt(76, 1);                // pattern type
    if (data.solid==false) {
        dw.dxfReal(52, data.angle);
        dw.dxfReal(41, data.scale);
        dw.dxfInt(77, 0);            // not double
        //dw.dxfInt(78, 0);
        dw.dxfInt(78, 1);
        dw.dxfReal(53, 45.0);
        dw.dxfReal(43, 0.0);
        dw.dxfReal(44, 0.0);
        dw.dxfReal(45, -0.0883883476483184);
        dw.dxfReal(46, 0.0883883476483185);
        dw.dxfInt(79, 0);
    }
    dw.dxfInt(98, 0);
}



/**
 * Writes the beginning of a hatch loop to the file. This
 * must happen after writing the beginning of a hatch entity.
 *
 * @param dw DXF writer
 * @param data Entity data.
 * @param attrib Attributes
 */
void DL_Dxf::writeHatchLoop1(DL_WriterA& dw,
                             const DL_HatchLoopData& data) {

    dw.dxfInt(92, 1);
    dw.dxfInt(93, data.numEdges);
    //dw.dxfInt(97, 0);
}



/**
 * Writes the end of a hatch loop to the file.
 *
 * @param dw DXF writer
 * @param data Entity data.
 * @param attrib Attributes
 */
void DL_Dxf::writeHatchLoop2(DL_WriterA& dw,
                             const DL_HatchLoopData& /*data*/) {

    dw.dxfInt(97, 0);
}


/**
 * Writes the beginning of a hatch entity to the file.
 *
 * @param dw DXF writer
 * @param data Entity data.
 * @param attrib Attributes
 */
void DL_Dxf::writeHatchEdge(DL_WriterA& dw,
                            const DL_HatchEdgeData& data) {

    dw.dxfInt(72, data.type);

    switch (data.type) {
    case 1:
        dw.dxfReal(10, data.x1);
        dw.dxfReal(20, data.y1);
        dw.dxfReal(11, data.x2);
        dw.dxfReal(21, data.y2);
        break;
    case 2:
        dw.dxfReal(10, data.cx);
        dw.dxfReal(20, data.cy);
        dw.dxfReal(40, data.radius);
        dw.dxfReal(50, data.angle1/(2*M_PI)*360.0);
        dw.dxfReal(51, data.angle2/(2*M_PI)*360.0);
        dw.dxfInt(73, (int)(data.ccw));
        break;
    default:
        break;
    }
}



/**
 * Writes an image entity.
 *
 * @return IMAGEDEF handle. Needed for the IMAGEDEF counterpart.
 */
int DL_Dxf::writeImage(DL_WriterA& dw,
                       const DL_ImageData& data,
                       const DL_Attributes& attrib) {

    /*if (data.file.empty()) {
        std::cerr << "DL_Dxf::writeImage: "
        << "Image file must not be empty\n";
        return;
}*/

    dw.entity("IMAGE");

    dw.entityAttributes(attrib);
    if (version==VER_2000) {
        dw.dxfString(100, "AcDbEntity");
        dw.dxfString(100, "AcDbRasterImage");
        dw.dxfInt(90, 0);
    }
    // insertion point
    dw.dxfReal(10, data.ipx);
    dw.dxfReal(20, data.ipy);
    dw.dxfReal(30, 0.0);

    // vector along bottom side (1 pixel long)
    dw.dxfReal(11, data.ux);
    dw.dxfReal(21, data.uy);
    dw.dxfReal(31, 0.0);

    // vector along left side (1 pixel long)
    dw.dxfReal(12, data.vx);
    dw.dxfReal(22, data.vy);
    dw.dxfReal(32, 0.0);

    // image size in pixel
    dw.dxfReal(13, data.width);
    dw.dxfReal(23, data.height);

    // handle of IMAGEDEF object
    int handle = dw.incHandle();
    dw.dxfHex(340, handle);

    // flags
    dw.dxfInt(70, 15);

    // clipping:
    dw.dxfInt(280, 0);

    // brightness, contrast, fade
    dw.dxfInt(281, data.brightness);
    dw.dxfInt(282, data.contrast);
    dw.dxfInt(283, data.fade);

    return handle;
}



/**
 * Writes an image definiition entity.
 */
void DL_Dxf::writeImageDef(DL_WriterA& dw,
                           int handle,
                           const DL_ImageData& data) {

    /*if (data.file.empty()) {
        std::cerr << "DL_Dxf::writeImage: "
        << "Image file must not be empty\n";
        return;
}*/

    dw.dxfString(0, "IMAGEDEF");
    if (version==VER_2000) {
    	dw.dxfHex(5, handle);
	}

    if (version==VER_2000) {
        dw.dxfString(100, "AcDbRasterImageDef");
        dw.dxfInt(90, 0);
    }
    // file name:
    dw.dxfString(1, data.ref);

    // image size in pixel
    dw.dxfReal(10, data.width);
    dw.dxfReal(20, data.height);

    dw.dxfReal(11, 1.0);
    dw.dxfReal(21, 1.0);

    // loaded:
    dw.dxfInt(280, 1);
    // units:
    dw.dxfInt(281, 0);
}


/**
 * Writes a layer to the file. Layers are stored in the 
 * tables section of a DXF file.
 *
 * @param dw DXF writer
 * @param data Entity data from the file
 * @param attrib Attributes
 */
void DL_Dxf::writeLayer(DL_WriterA& dw,
                        const DL_LayerData& data,
                        const DL_Attributes& attrib) {

    if (data.name.empty()) {
        std::cerr << "DL_Dxf::writeLayer: "
        << "Layer name must not be empty\n";
        return;
    }

    int color = attrib.getColor();
    if (color<=0 || color>=256) {
        std::cerr << "Layer color cannot be " << color << ". Changed to 7.\n";
        color = 7;
    }

    if (data.name == "0") {
        dw.tableLayerEntry(0x10);
    } else {
        dw.tableLayerEntry();
    }

    dw.dxfString(2, data.name);
    dw.dxfInt(70, data.flags);
    dw.dxfInt(62, color);

    dw.dxfString(6, (attrib.getLineType().length()==0 ?
                     string("CONTINUOUS") : attrib.getLineType()));

    if (version>=VER_2000) {
        // layer defpoints cannot be plotted
        std::string lstr = data.name;
        std::transform(lstr.begin(), lstr.end(), lstr.begin(), tolower);
        if (lstr=="defpoints") {
            dw.dxfInt(290, 0);
        }
    }
    if (version>=VER_2000 && attrib.getWidth()!=-1) {
        dw.dxfInt(370, attrib.getWidth());
    }
    if (version>=VER_2000) {
        dw.dxfHex(390, 0xF);
    }
}



/**
 * Writes a line type to the file. Line types are stored in the 
 * tables section of a DXF file.
 */
void DL_Dxf::writeLineType(DL_WriterA& dw,
                           const DL_LineTypeData& data) {
    //const char* description,
    //int elements,
    //double patternLength) {

    if (data.name.empty()) {
        std::cerr << "DL_Dxf::writeLineType: "
        << "Line type name must not be empty\n";
        return;
    }

	// ignore BYLAYER, BYBLOCK for R12
	if (version<VER_2000) {
		if (!strcasecmp(data.name.c_str(), "BYBLOCK") ||
		    !strcasecmp(data.name.c_str(), "BYLAYER")) {
			return;
		}
	}

	// write id (not for R12)
    if (!strcasecmp(data.name.c_str(), "BYBLOCK")) {
        dw.tableLineTypeEntry(0x14);
    } else if (!strcasecmp(data.name.c_str(), "BYLAYER")) {
        dw.tableLineTypeEntry(0x15);
    } else if (!strcasecmp(data.name.c_str(), "CONTINUOUS")) {
        dw.tableLineTypeEntry(0x16);
    } else {
        dw.tableLineTypeEntry();
    }

    dw.dxfString(2, data.name);
	//if (version>=VER_2000) {
    	dw.dxfInt(70, data.flags);
	//}

    if (!strcasecmp(data.name.c_str(), "BYBLOCK")) {
        dw.dxfString(3, "");
        dw.dxfInt(72, 65);
        dw.dxfInt(73, 0);
        dw.dxfReal(40, 0.0);
    } else if (!strcasecmp(data.name.c_str(), "BYLAYER")) {
        dw.dxfString(3, "");
        dw.dxfInt(72, 65);
        dw.dxfInt(73, 0);
        dw.dxfReal(40, 0.0);
    } else if (!strcasecmp(data.name.c_str(), "CONTINUOUS")) {
        dw.dxfString(3, "Solid line");
        dw.dxfInt(72, 65);
        dw.dxfInt(73, 0);
        dw.dxfReal(40, 0.0);
    } else if (!strcasecmp(data.name.c_str(), "ACAD_ISO02W100")) {
        dw.dxfString(3, "ISO Dashed __ __ __ __ __ __ __ __ __ __ _");
        dw.dxfInt(72, 65);
        dw.dxfInt(73, 2);
        dw.dxfReal(40, 15.0);
        dw.dxfReal(49, 12.0);
        if (version>=VER_R13)
            dw.dxfInt(74, 0);
        dw.dxfReal(49, -3.0);
        if (version>=VER_R13)
            dw.dxfInt(74, 0);
    } else if (!strcasecmp(data.name.c_str(), "ACAD_ISO03W100")) {
        dw.dxfString(3, "ISO Dashed with Distance __    __    __    _");
        dw.dxfInt(72, 65);
        dw.dxfInt(73, 2);
        dw.dxfReal(40, 30.0);
        dw.dxfReal(49, 12.0);
        if (version>=VER_R13)
            dw.dxfInt(74, 0);
        dw.dxfReal(49, -18.0);
        if (version>=VER_R13)
            dw.dxfInt(74, 0);
    } else if (!strcasecmp(data.name.c_str(), "ACAD_ISO04W100")) {
        dw.dxfString(3, "ISO Long Dashed Dotted ____ . ____ . __");
        dw.dxfInt(72, 65);
        dw.dxfInt(73, 4);
        dw.dxfReal(40, 30.0);
        dw.dxfReal(49, 24.0);
        if (version>=VER_R13)
            dw.dxfInt(74, 0);
        dw.dxfReal(49, -3.0);
        if (version>=VER_R13)
            dw.dxfInt(74, 0);
        dw.dxfReal(49, 0.0);
        if (version>=VER_R13)
            dw.dxfInt(74, 0);
        dw.dxfReal(49, -3.0);
        if (version>=VER_R13)
            dw.dxfInt(74, 0);
    } else if (!strcasecmp(data.name.c_str(), "ACAD_ISO05W100")) {
        dw.dxfString(3, "ISO Long Dashed Double Dotted ____ .. __");
        dw.dxfInt(72, 65);
        dw.dxfInt(73, 6);
        dw.dxfReal(40, 33.0);
        dw.dxfReal(49, 24.0);
        if (version>=VER_R13)
            dw.dxfInt(74, 0);
        dw.dxfReal(49, -3.0);
        if (version>=VER_R13)
            dw.dxfInt(74, 0);
        dw.dxfReal(49, 0.0);
        if (version>=VER_R13)
            dw.dxfInt(74, 0);
        dw.dxfReal(49, -3.0);
        if (version>=VER_R13)
            dw.dxfInt(74, 0);
        dw.dxfReal(49, 0.0);
        if (version>=VER_R13)
            dw.dxfInt(74, 0);
        dw.dxfReal(49, -3.0);
        if (version>=VER_R13)
            dw.dxfInt(74, 0);
    } else if (!strcasecmp(data.name.c_str(), "BORDER")) {
        dw.dxfString(3, "Border __ __ . __ __ . __ __ . __ __ . __ __ .");
        dw.dxfInt(72, 65);
        dw.dxfInt(73, 6);
        dw.dxfReal(40, 44.45);
        dw.dxfReal(49, 12.7);
        if (version>=VER_R13)
            dw.dxfInt(74, 0);
        dw.dxfReal(49, -6.35);
        if (version>=VER_R13)
            dw.dxfInt(74, 0);
        dw.dxfReal(49, 12.7);
        if (version>=VER_R13)
            dw.dxfInt(74, 0);
        dw.dxfReal(49, -6.35);
        if (version>=VER_R13)
            dw.dxfInt(74, 0);
        dw.dxfReal(49, 0.0);
        if (version>=VER_R13)
            dw.dxfInt(74, 0);
        dw.dxfReal(49, -6.35);
        if (version>=VER_R13)
            dw.dxfInt(74, 0);
    } else if (!strcasecmp(data.name.c_str(), "BORDER2")) {
        dw.dxfString(3, "Border (.5x) __.__.__.__.__.__.__.__.__.__.__.");
        dw.dxfInt(72, 65);
        dw.dxfInt(73, 6);
        dw.dxfReal(40, 22.225);
        dw.dxfReal(49, 6.35);
        if (version>=VER_R13)
            dw.dxfInt(74, 0);
        dw.dxfReal(49, -3.175);
        if (version>=VER_R13)
            dw.dxfInt(74, 0);
        dw.dxfReal(49, 6.35);
        if (version>=VER_R13)
            dw.dxfInt(74, 0);
        dw.dxfReal(49, -3.175);
        if (version>=VER_R13)
            dw.dxfInt(74, 0);
        dw.dxfReal(49, 0.0);
        if (version>=VER_R13)
            dw.dxfInt(74, 0);
        dw.dxfReal(49, -3.175);
        if (version>=VER_R13)
            dw.dxfInt(74, 0);
    } else if (!strcasecmp(data.name.c_str(), "BORDERX2")) {
        dw.dxfString(3, "Border (2x) ____  ____  .  ____  ____  .  ___");
        dw.dxfInt(72, 65);
        dw.dxfInt(73, 6);
        dw.dxfReal(40, 88.9);
        dw.dxfReal(49, 25.4);
        if (version>=VER_R13)
            dw.dxfInt(74, 0);
        dw.dxfReal(49, -12.7);
        if (version>=VER_R13)
            dw.dxfInt(74, 0);
        dw.dxfReal(49, 25.4);
        if (version>=VER_R13)
            dw.dxfInt(74, 0);
        dw.dxfReal(49, -12.7);
        if (version>=VER_R13)
            dw.dxfInt(74, 0);
        dw.dxfReal(49, 0.0);
        if (version>=VER_R13)
            dw.dxfInt(74, 0);
        dw.dxfReal(49, -12.7);
        if (version>=VER_R13)
            dw.dxfInt(74, 0);
    } else if (!strcasecmp(data.name.c_str(), "CENTER")) {
        dw.dxfString(3, "Center ____ _ ____ _ ____ _ ____ _ ____ _ ____");
        dw.dxfInt(72, 65);
        dw.dxfInt(73, 4);
        dw.dxfReal(40, 50.8);
        dw.dxfReal(49, 31.75);
        if (version>=VER_R13)
            dw.dxfInt(74, 0);
        dw.dxfReal(49, -6.35);
        if (version>=VER_R13)
            dw.dxfInt(74, 0);
        dw.dxfReal(49, 6.35);
        if (version>=VER_R13)
            dw.dxfInt(74, 0);
        dw.dxfReal(49, -6.35);
        if (version>=VER_R13)
            dw.dxfInt(74, 0);
    } else if (!strcasecmp(data.name.c_str(), "CENTER2")) {
        dw.dxfString(3, "Center (.5x) ___ _ ___ _ ___ _ ___ _ ___ _ ___");
        dw.dxfInt(72, 65);
        dw.dxfInt(73, 4);
        dw.dxfReal(40, 28.575);
        dw.dxfReal(49, 19.05);
        if (version>=VER_R13)
            dw.dxfInt(74, 0);
        dw.dxfReal(49, -3.175);
        if (version>=VER_R13)
            dw.dxfInt(74, 0);
        dw.dxfReal(49, 3.175);
        if (version>=VER_R13)
            dw.dxfInt(74, 0);
        dw.dxfReal(49, -3.175);
        if (version>=VER_R13)
            dw.dxfInt(74, 0);
    } else if (!strcasecmp(data.name.c_str(), "CENTERX2")) {
        dw.dxfString(3, "Center (2x) ________  __  ________  __  _____");
        dw.dxfInt(72, 65);
        dw.dxfInt(73, 4);
        dw.dxfReal(40, 101.6);
        dw.dxfReal(49, 63.5);
        if (version>=VER_R13)
            dw.dxfInt(74, 0);
        dw.dxfReal(49, -12.7);
        if (version>=VER_R13)
            dw.dxfInt(74, 0);
        dw.dxfReal(49, 12.7);
        if (version>=VER_R13)
            dw.dxfInt(74, 0);
        dw.dxfReal(49, -12.7);
        if (version>=VER_R13)
            dw.dxfInt(74, 0);
    } else if (!strcasecmp(data.name.c_str(), "DASHDOT")) {
        dw.dxfString(3, "Dash dot __ . __ . __ . __ . __ . __ . __ . __");
        dw.dxfInt(72, 65);
        dw.dxfInt(73, 4);
        dw.dxfReal(40, 25.4);
        dw.dxfReal(49, 12.7);
        if (version>=VER_R13)
            dw.dxfInt(74, 0);
        dw.dxfReal(49, -6.35);
        if (version>=VER_R13)
            dw.dxfInt(74, 0);
        dw.dxfReal(49, 0.0);
        if (version>=VER_R13)
            dw.dxfInt(74, 0);
        dw.dxfReal(49, -6.35);
        if (version>=VER_R13)
            dw.dxfInt(74, 0);
    } else if (!strcasecmp(data.name.c_str(), "DASHDOT2")) {
        dw.dxfString(3, "Dash dot (.5x) _._._._._._._._._._._._._._._.");
        dw.dxfInt(72, 65);
        dw.dxfInt(73, 4);
        dw.dxfReal(40, 12.7);
        dw.dxfReal(49, 6.35);
        if (version>=VER_R13)
            dw.dxfInt(74, 0);
        dw.dxfReal(49, -3.175);
        if (version>=VER_R13)
            dw.dxfInt(74, 0);
        dw.dxfReal(49, 0.0);
        if (version>=VER_R13)
            dw.dxfInt(74, 0);
        dw.dxfReal(49, -3.175);
        if (version>=VER_R13)
            dw.dxfInt(74, 0);
    } else if (!strcasecmp(data.name.c_str(), "DASHDOTX2")) {
        dw.dxfString(3, "Dash dot (2x) ____  .  ____  .  ____  .  ___");
        dw.dxfInt(72, 65);
        dw.dxfInt(73, 4);
        dw.dxfReal(40, 50.8);
        dw.dxfReal(49, 25.4);
        if (version>=VER_R13)
            dw.dxfInt(74, 0);
        dw.dxfReal(49, -12.7);
        if (version>=VER_R13)
            dw.dxfInt(74, 0);
        dw.dxfReal(49, 0.0);
        if (version>=VER_R13)
            dw.dxfInt(74, 0);
        dw.dxfReal(49, -12.7);
        if (version>=VER_R13)
            dw.dxfInt(74, 0);
    } else if (!strcasecmp(data.name.c_str(), "DASHED")) {
        dw.dxfString(3, "Dashed __ __ __ __ __ __ __ __ __ __ __ __ __ _");
        dw.dxfInt(72, 65);
        dw.dxfInt(73, 2);
        dw.dxfReal(40, 19.05);
        dw.dxfReal(49, 12.7);
        if (version>=VER_R13)
            dw.dxfInt(74, 0);
        dw.dxfReal(49, -6.35);
        if (version>=VER_R13)
            dw.dxfInt(74, 0);
    } else if (!strcasecmp(data.name.c_str(), "DASHED2")) {
        dw.dxfString(3, "Dashed (.5x) _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _");
        dw.dxfInt(72, 65);
        dw.dxfInt(73, 2);
        dw.dxfReal(40, 9.525);
        dw.dxfReal(49, 6.35);
        if (version>=VER_R13)
            dw.dxfInt(74, 0);
        dw.dxfReal(49, -3.175);
        if (version>=VER_R13)
            dw.dxfInt(74, 0);
    } else if (!strcasecmp(data.name.c_str(), "DASHEDX2")) {
        dw.dxfString(3, "Dashed (2x) ____  ____  ____  ____  ____  ___");
        dw.dxfInt(72, 65);
        dw.dxfInt(73, 2);
        dw.dxfReal(40, 38.1);
        dw.dxfReal(49, 25.4);
        if (version>=VER_R13)
            dw.dxfInt(74, 0);
        dw.dxfReal(49, -12.7);
        if (version>=VER_R13)
            dw.dxfInt(74, 0);
    } else if (!strcasecmp(data.name.c_str(), "DIVIDE")) {
        dw.dxfString(3, "Divide ____ . . ____ . . ____ . . ____ . . ____");
        dw.dxfInt(72, 65);
        dw.dxfInt(73, 6);
        dw.dxfReal(40, 31.75);
        dw.dxfReal(49, 12.7);
        if (version>=VER_R13)
            dw.dxfInt(74, 0);
        dw.dxfReal(49, -6.35);
        if (version>=VER_R13)
            dw.dxfInt(74, 0);
        dw.dxfReal(49, 0.0);
        if (version>=VER_R13)
            dw.dxfInt(74, 0);
        dw.dxfReal(49, -6.35);
        if (version>=VER_R13)
            dw.dxfInt(74, 0);
        dw.dxfReal(49, 0.0);
        if (version>=VER_R13)
            dw.dxfInt(74, 0);
        dw.dxfReal(49, -6.35);
        if (version>=VER_R13)
            dw.dxfInt(74, 0);
    } else if (!strcasecmp(data.name.c_str(), "DIVIDE2")) {
        dw.dxfString(3, "Divide (.5x) __..__..__..__..__..__..__..__.._");
        dw.dxfInt(72, 65);
        dw.dxfInt(73, 6);
        dw.dxfReal(40, 15.875);
        dw.dxfReal(49, 6.35);
        if (version>=VER_R13)
            dw.dxfInt(74, 0);
        dw.dxfReal(49, -3.175);
        if (version>=VER_R13)
            dw.dxfInt(74, 0);
        dw.dxfReal(49, 0.0);
        if (version>=VER_R13)
            dw.dxfInt(74, 0);
        dw.dxfReal(49, -3.175);
        if (version>=VER_R13)
            dw.dxfInt(74, 0);
        dw.dxfReal(49, 0.0);
        if (version>=VER_R13)
            dw.dxfInt(74, 0);
        dw.dxfReal(49, -3.175);
        if (version>=VER_R13)
            dw.dxfInt(74, 0);
    } else if (!strcasecmp(data.name.c_str(), "DIVIDEX2")) {
        dw.dxfString(3, "Divide (2x) ________  .  .  ________  .  .  _");
        dw.dxfInt(72, 65);
        dw.dxfInt(73, 6);
        dw.dxfReal(40, 63.5);
        dw.dxfReal(49, 25.4);
        if (version>=VER_R13)
            dw.dxfInt(74, 0);
        dw.dxfReal(49, -12.7);
        if (version>=VER_R13)
            dw.dxfInt(74, 0);
        dw.dxfReal(49, 0.0);
        if (version>=VER_R13)
            dw.dxfInt(74, 0);
        dw.dxfReal(49, -12.7);
        if (version>=VER_R13)
            dw.dxfInt(74, 0);
        dw.dxfReal(49, 0.0);
        if (version>=VER_R13)
            dw.dxfInt(74, 0);
        dw.dxfReal(49, -12.7);
        if (version>=VER_R13)
            dw.dxfInt(74, 0);
    } else if (!strcasecmp(data.name.c_str(), "DOT")) {
        dw.dxfString(3, "Dot . . . . . . . . . . . . . . . . . . . . . .");
        dw.dxfInt(72, 65);
        dw.dxfInt(73, 2);
        dw.dxfReal(40, 6.35);
        dw.dxfReal(49, 0.0);
        if (version>=VER_R13)
            dw.dxfInt(74, 0);
        dw.dxfReal(49, -6.35);
        if (version>=VER_R13)
            dw.dxfInt(74, 0);
    } else if (!strcasecmp(data.name.c_str(), "DOT2")) {
        dw.dxfString(3, "Dot (.5x) .....................................");
        dw.dxfInt(72, 65);
        dw.dxfInt(73, 2);
        dw.dxfReal(40, 3.175);
        dw.dxfReal(49, 0.0);
        if (version>=VER_R13)
            dw.dxfInt(74, 0);
        dw.dxfReal(49, -3.175);
        if (version>=VER_R13)
            dw.dxfInt(74, 0);
    } else if (!strcasecmp(data.name.c_str(), "DOTX2")) {
        dw.dxfString(3, "Dot (2x) .  .  .  .  .  .  .  .  .  .  .  .  .");
        dw.dxfInt(72, 65);
        dw.dxfInt(73, 2);
        dw.dxfReal(40, 12.7);
        dw.dxfReal(49, 0.0);
        if (version>=VER_R13)
            dw.dxfInt(74, 0);
        dw.dxfReal(49, -12.7);
        if (version>=VER_R13)
            dw.dxfInt(74, 0);
    } else {
        std::cerr << "dxflib warning: DL_Dxf::writeLineType: Unknown Line Type\n";
    }
}



/**
 * Writes the APPID section to the DXF file.
 *
 * @param name Application name
 */
void DL_Dxf::writeAppid(DL_WriterA& dw, const string& name) {
    if (name.empty()) {
        std::cerr << "DL_Dxf::writeAppid: "
        << "Application  name must not be empty\n";
        return;
    }

    if (!strcasecmp(name.c_str(), "ACAD")) {
        dw.tableAppidEntry(0x12);
    } else {
        dw.tableAppidEntry();
    }
    dw.dxfString(2, name);
    dw.dxfInt(70, 0);
}



/**
 * Writes a block's definition (no entities) to the DXF file.
 */
void DL_Dxf::writeBlock(DL_WriterA& dw, const DL_BlockData& data) {
    if (data.name.empty()) {
        std::cerr << "DL_Dxf::writeBlock: "
        << "Block name must not be empty\n";
        return;
    }

    //bool paperSpace = !strcasecmp(name, "*paper_space");
    //!strcasecmp(name, "*paper_space0");

    if (!strcasecmp(data.name.c_str(), "*paper_space")) {
        dw.sectionBlockEntry(0x1C);
    } else if (!strcasecmp(data.name.c_str(), "*model_space")) {
        dw.sectionBlockEntry(0x20);
    } else if (!strcasecmp(data.name.c_str(), "*paper_space0")) {
        dw.sectionBlockEntry(0x24);
    } else {
        dw.sectionBlockEntry();
    }
    dw.dxfString(2, data.name);
    dw.dxfInt(70, 0);
    dw.coord(10, data.bpx, data.bpy);
    dw.dxfString(3, data.name);
    dw.dxfString(1, "");
}



/**
 * Writes a block end.
 *
 * @param name Block name
 */
void DL_Dxf::writeEndBlock(DL_WriterA& dw, const string& name) {
    if (!strcasecmp(name.c_str(), "*paper_space")) {
        dw.sectionBlockEntryEnd(0x1D);
    } else if (!strcasecmp(name.c_str(), "*model_space")) {
        dw.sectionBlockEntryEnd(0x21);
    } else if (!strcasecmp(name.c_str(), "*paper_space0")) {
        dw.sectionBlockEntryEnd(0x25);
    } else {
        dw.sectionBlockEntryEnd();
    }
}



/**
 * Writes a viewport section. This section is needed in VER_R13.
 * Note that this method currently only writes a faked VPORT section
 * to make the file readable by Aut*cad.
 */
void DL_Dxf::writeVPort(DL_WriterA& dw) {
    dw.dxfString(0, "TABLE");
    dw.dxfString(2, "VPORT");
    if (version==VER_2000) {
        dw.dxfHex(5, 0x8);
    }
    //dw.dxfHex(330, 0);
    if (version==VER_2000) {
        dw.dxfString(100, "AcDbSymbolTable");
    }
    dw.dxfInt(70, 1);
    dw.dxfString(0, "VPORT");
    //dw.dxfHex(5, 0x2F);
    if (version==VER_2000) {
        dw.handle();
    }
    //dw.dxfHex(330, 8);
    if (version==VER_2000) {
        dw.dxfString(100, "AcDbSymbolTableRecord");
        dw.dxfString(100, "AcDbViewportTableRecord");
    }
    dw.dxfString(  2, "*Active");
    dw.dxfInt( 70, 0);
    dw.dxfReal( 10, 0.0);
    dw.dxfReal( 20, 0.0);
    dw.dxfReal( 11, 1.0);
    dw.dxfReal( 21, 1.0);
    dw.dxfReal( 12, 286.3055555555555);
    dw.dxfReal( 22, 148.5);
    dw.dxfReal( 13, 0.0);
    dw.dxfReal( 23, 0.0);
    dw.dxfReal( 14, 10.0);
    dw.dxfReal( 24, 10.0);
    dw.dxfReal( 15, 10.0);
    dw.dxfReal( 25, 10.0);
    dw.dxfReal( 16, 0.0);
    dw.dxfReal( 26, 0.0);
    dw.dxfReal( 36, 1.0);
    dw.dxfReal( 17, 0.0);
    dw.dxfReal( 27, 0.0);
    dw.dxfReal( 37, 0.0);
    dw.dxfReal( 40, 297.0);
    dw.dxfReal( 41, 1.92798353909465);
    dw.dxfReal( 42, 50.0);
    dw.dxfReal( 43, 0.0);
    dw.dxfReal( 44, 0.0);
    dw.dxfReal( 50, 0.0);
    dw.dxfReal( 51, 0.0);
    dw.dxfInt( 71, 0);
    dw.dxfInt( 72, 100);
    dw.dxfInt( 73, 1);
    dw.dxfInt( 74, 3);
    dw.dxfInt( 75, 1);
    dw.dxfInt( 76, 1);
    dw.dxfInt( 77, 0);
    dw.dxfInt( 78, 0);

    if (version==VER_2000) {
        dw.dxfInt(281, 0);
        dw.dxfInt( 65, 1);
        dw.dxfReal(110, 0.0);
        dw.dxfReal(120, 0.0);
        dw.dxfReal(130, 0.0);
        dw.dxfReal(111, 1.0);
        dw.dxfReal(121, 0.0);
        dw.dxfReal(131, 0.0);
        dw.dxfReal(112, 0.0);
        dw.dxfReal(122, 1.0);
        dw.dxfReal(132, 0.0);
        dw.dxfInt( 79, 0);
        dw.dxfReal(146, 0.0);
    }
    dw.dxfString(  0, "ENDTAB");
}



/**
 * Writes a style section. This section is needed in VER_R13.
 * Note that this method currently only writes a faked STYLE section
 * to make the file readable by Aut*cad.
 */
void DL_Dxf::writeStyle(DL_WriterA& dw) {
    dw.dxfString(  0, "TABLE");
    dw.dxfString(  2, "STYLE");
    if (version==VER_2000) {
    	dw.dxfHex(5, 3);
	}
    //dw.dxfHex(330, 0);
    if (version==VER_2000) {
        dw.dxfString(100, "AcDbSymbolTable");
    }
    dw.dxfInt( 70, 1);
    dw.dxfString(  0, "STYLE");
    if (version==VER_2000) {
    	dw.dxfHex(5, 0x11);
	}
    //styleHandleStd = dw.handle();
    //dw.dxfHex(330, 3);
    if (version==VER_2000) {
        dw.dxfString(100, "AcDbSymbolTableRecord");
        dw.dxfString(100, "AcDbTextStyleTableRecord");
    }
    dw.dxfString(  2, "Standard");
    dw.dxfInt( 70, 0);
    dw.dxfReal( 40, 0.0);
    dw.dxfReal( 41, 0.75);
    dw.dxfReal( 50, 0.0);
    dw.dxfInt( 71, 0);
    dw.dxfReal( 42, 2.5);
    dw.dxfString(  3, "txt");
    dw.dxfString(  4, "");
    dw.dxfString(  0, "ENDTAB");
}



/**
 * Writes a view section. This section is needed in VER_R13.
 * Note that this method currently only writes a faked VIEW section
 * to make the file readable by Aut*cad.
 */
void DL_Dxf::writeView(DL_WriterA& dw) {
    dw.dxfString(  0, "TABLE");
    dw.dxfString(  2, "VIEW");
    if (version==VER_2000) {
    	dw.dxfHex(5, 6);
	}
    //dw.dxfHex(330, 0);
    if (version==VER_2000) {
        dw.dxfString(100, "AcDbSymbolTable");
    }
    dw.dxfInt( 70, 0);
    dw.dxfString(  0, "ENDTAB");
}



/**
 * Writes a ucs section. This section is needed in VER_R13.
 * Note that this method currently only writes a faked UCS section
 * to make the file readable by Aut*cad.
 */
void DL_Dxf::writeUcs(DL_WriterA& dw) {
    dw.dxfString(  0, "TABLE");
    dw.dxfString(  2, "UCS");
    if (version==VER_2000) {
    	dw.dxfHex(5, 7);
	}
    //dw.dxfHex(330, 0);
    if (version==VER_2000) {
        dw.dxfString(100, "AcDbSymbolTable");
    }
    dw.dxfInt( 70, 0);
    dw.dxfString(  0, "ENDTAB");
}



/**
 * Writes a dimstyle section. This section is needed in VER_R13.
 * Note that this method currently only writes a faked DIMSTYLE section
 * to make the file readable by Aut*cad.
 */
void DL_Dxf::writeDimStyle(DL_WriterA& dw, 
					double dimasz, double dimexe, double dimexo,
                       double dimgap, double dimtxt) {

    dw.dxfString(  0, "TABLE");
    dw.dxfString(  2, "DIMSTYLE");
    if (version==VER_2000) {
        dw.dxfHex(5, 0xA);
        dw.dxfString(100, "AcDbSymbolTable");
    }
    dw.dxfInt( 70, 1);
    if (version==VER_2000) {
        dw.dxfString(100, "AcDbDimStyleTable");
        dw.dxfInt( 71, 0);
    }


    dw.dxfString(  0, "DIMSTYLE");
    if (version==VER_2000) {
        dw.dxfHex(105, 0x27);
    }
    //dw.handle(105);
    //dw.dxfHex(330, 0xA);
    if (version==VER_2000) {
        dw.dxfString(100, "AcDbSymbolTableRecord");
        dw.dxfString(100, "AcDbDimStyleTableRecord");
    }
    dw.dxfString(  2, "Standard");
    if (version==VER_R12) {
        dw.dxfString(  3, "");
        dw.dxfString(  4, "");
        dw.dxfString(  5, "");
        dw.dxfString(  6, "");
        dw.dxfString(  7, "");
        dw.dxfReal( 40, 1.0);
    }

    dw.dxfReal( 41, dimasz);
    dw.dxfReal( 42, dimexo);
    dw.dxfReal( 43, 3.75);
    dw.dxfReal( 44, dimexe);
    if (version==VER_R12) {
        dw.dxfReal( 45, 0.0);
        dw.dxfReal( 46, 0.0);
        dw.dxfReal( 47, 0.0);
        dw.dxfReal( 48, 0.0);
    }
    dw.dxfInt( 70, 0);
    if (version==VER_R12) {
        dw.dxfInt( 71, 0);
        dw.dxfInt( 72, 0);
    }
    dw.dxfInt( 73, 0);
    dw.dxfInt( 74, 0);
    if (version==VER_R12) {
        dw.dxfInt( 75, 0);
        dw.dxfInt( 76, 0);
    }
    dw.dxfInt( 77, 1);
    dw.dxfInt( 78, 8);
    dw.dxfReal(140, dimtxt);
    dw.dxfReal(141, 2.5);
    if (version==VER_R12) {
        dw.dxfReal(142, 0.0);
    }
    dw.dxfReal(143, 0.03937007874016);
    if (version==VER_R12) {
        dw.dxfReal(144, 1.0);
        dw.dxfReal(145, 0.0);
        dw.dxfReal(146, 1.0);
    }
    dw.dxfReal(147, dimgap);
    if (version==VER_R12) {
        dw.dxfInt(170, 0);
    }
    dw.dxfInt(171, 3);
    dw.dxfInt(172, 1);
    if (version==VER_R12) {
        dw.dxfInt(173, 0);
        dw.dxfInt(174, 0);
        dw.dxfInt(175, 0);
        dw.dxfInt(176, 0);
        dw.dxfInt(177, 0);
        dw.dxfInt(178, 0);
    }
    if (version==VER_2000) {
        dw.dxfInt(271, 2);
        dw.dxfInt(272, 2);
        dw.dxfInt(274, 3);
        dw.dxfInt(278, 44);
        dw.dxfInt(283, 0);
        dw.dxfInt(284, 8);
        //dw.dxfHex(340, styleHandleStd);
        dw.dxfHex(340, 0x11);
    }
    // * /
    dw.dxfString(  0, "ENDTAB");
}



/**
 * Writes a blockrecord section. This section is needed in VER_R13.
 * Note that this method currently only writes a faked BLOCKRECORD section
 * to make the file readable by Aut*cad.
 */
void DL_Dxf::writeBlockRecord(DL_WriterA& dw) {
    dw.dxfString(  0, "TABLE");
    dw.dxfString(  2, "BLOCK_RECORD");
    if (version==VER_2000) {
    	dw.dxfHex(5, 1);
	}
    //dw.dxfHex(330, 0);
    if (version==VER_2000) {
        dw.dxfString(100, "AcDbSymbolTable");
    }
    dw.dxfInt( 70, 1);

    dw.dxfString(  0, "BLOCK_RECORD");
    if (version==VER_2000) {
    	dw.dxfHex(5, 0x1F);
	}
    //int msh = dw.handle();
    //dw.setModelSpaceHandle(msh);
    //dw.dxfHex(330, 1);
    if (version==VER_2000) {
        dw.dxfString(100, "AcDbSymbolTableRecord");
        dw.dxfString(100, "AcDbBlockTableRecord");
    }
    dw.dxfString(  2, "*Model_Space");
    dw.dxfHex(340, 0x22);

    dw.dxfString(  0, "BLOCK_RECORD");
    if (version==VER_2000) {
    	dw.dxfHex(5, 0x1B);
	}
    //int psh = dw.handle();
    //dw.setPaperSpaceHandle(psh);
    //dw.dxfHex(330, 1);
    if (version==VER_2000) {
        dw.dxfString(100, "AcDbSymbolTableRecord");
        dw.dxfString(100, "AcDbBlockTableRecord");
    }
    dw.dxfString(  2, "*Paper_Space");
    dw.dxfHex(340, 0x1E);

    dw.dxfString(  0, "BLOCK_RECORD");
    if (version==VER_2000) {
    	dw.dxfHex(5, 0x23);
	}
    //int ps0h = dw.handle();
    //dw.setPaperSpace0Handle(ps0h);
    //dw.dxfHex(330, 1);
    if (version==VER_2000) {
        dw.dxfString(100, "AcDbSymbolTableRecord");
        dw.dxfString(100, "AcDbBlockTableRecord");
    }
    dw.dxfString(  2, "*Paper_Space0");
    dw.dxfHex(340, 0x26);

    //dw.dxfString(  0, "ENDTAB");
}



/**
 * Writes a single block record with the given name.
 */
void DL_Dxf::writeBlockRecord(DL_WriterA& dw, const string& name) {
    dw.dxfString(  0, "BLOCK_RECORD");
    if (version==VER_2000) {
    	dw.handle();
	}
    //dw->dxfHex(330, 1);
    if (version==VER_2000) {
        dw.dxfString(100, "AcDbSymbolTableRecord");
        dw.dxfString(100, "AcDbBlockTableRecord");
    }
    dw.dxfString(  2, name);
    dw.dxfHex(340, 0);
}



/**
 * Writes a objects section. This section is needed in VER_R13.
 * Note that this method currently only writes a faked OBJECTS section
 * to make the file readable by Aut*cad.
 */
void DL_Dxf::writeObjects(DL_WriterA& dw) {
    //int dicId, dicId2, dicId3, dicId4, dicId5;
    //int dicId5;

    dw.dxfString(  0, "SECTION");
    dw.dxfString(  2, "OBJECTS");
    dw.dxfString(  0, "DICTIONARY");
    dw.dxfHex(5, 0xC);                            // C
    //dw.dxfHex(330, 0);
    dw.dxfString(100, "AcDbDictionary");
    dw.dxfInt(280, 0);
    dw.dxfInt(281, 1);
    dw.dxfString(  3, "ACAD_GROUP");
    //dw.dxfHex(350, dw.getNextHandle());          // D
    dw.dxfHex(350, 0xD);          // D
    dw.dxfString(  3, "ACAD_LAYOUT");
    dw.dxfHex(350, 0x1A);
    //dw.dxfHex(350, dw.getNextHandle()+0);        // 1A
    dw.dxfString(  3, "ACAD_MLINESTYLE");
    dw.dxfHex(350, 0x17);
    //dw.dxfHex(350, dw.getNextHandle()+1);        // 17
    dw.dxfString(  3, "ACAD_PLOTSETTINGS");
    dw.dxfHex(350, 0x19);
    //dw.dxfHex(350, dw.getNextHandle()+2);        // 19
    dw.dxfString(  3, "ACAD_PLOTSTYLENAME");
    dw.dxfHex(350, 0xE);
    //dw.dxfHex(350, dw.getNextHandle()+3);        // E
    dw.dxfString(  3, "AcDbVariableDictionary");
    dw.dxfHex(350, dw.getNextHandle());        // 2C
    dw.dxfString(  0, "DICTIONARY");
    dw.dxfHex(5, 0xD);
    //dw.handle();                                    // D
    //dw.dxfHex(330, 0xC);
    dw.dxfString(100, "AcDbDictionary");
    dw.dxfInt(280, 0);
    dw.dxfInt(281, 1);
    dw.dxfString(  0, "ACDBDICTIONARYWDFLT");
    dw.dxfHex(5, 0xE);
    //dicId4 = dw.handle();                           // E
    //dw.dxfHex(330, 0xC);                       // C
    dw.dxfString(100, "AcDbDictionary");
    dw.dxfInt(281, 1);
    dw.dxfString(  3, "Normal");
    dw.dxfHex(350, 0xF);
    //dw.dxfHex(350, dw.getNextHandle()+5);        // F
    dw.dxfString(100, "AcDbDictionaryWithDefault");
    dw.dxfHex(340, 0xF);
    //dw.dxfHex(340, dw.getNextHandle()+5);        // F
    dw.dxfString(  0, "ACDBPLACEHOLDER");
    dw.dxfHex(5, 0xF);
    //dw.handle();                                    // F
    //dw.dxfHex(330, dicId4);                      // E
    dw.dxfString(  0, "DICTIONARY");
    //dicId3 = dw.handle();                           // 17
    dw.dxfHex(5, 0x17);
    //dw.dxfHex(330, 0xC);                       // C
    dw.dxfString(100, "AcDbDictionary");
    dw.dxfInt(280, 0);
    dw.dxfInt(281, 1);
    dw.dxfString(  3, "Standard");
    dw.dxfHex(350, 0x18);
    //dw.dxfHex(350, dw.getNextHandle()+5);        // 18
    dw.dxfString(  0, "MLINESTYLE");
    dw.dxfHex(5, 0x18);
    //dw.handle();                                    // 18
    //dw.dxfHex(330, dicId3);                      // 17
    dw.dxfString(100, "AcDbMlineStyle");
    dw.dxfString(  2, "STANDARD");
    dw.dxfInt( 70, 0);
    dw.dxfString(  3, "");
    dw.dxfInt( 62, 256);
    dw.dxfReal( 51, 90.0);
    dw.dxfReal( 52, 90.0);
    dw.dxfInt( 71, 2);
    dw.dxfReal( 49, 0.5);
    dw.dxfInt( 62, 256);
    dw.dxfString(  6, "BYLAYER");
    dw.dxfReal( 49, -0.5);
    dw.dxfInt( 62, 256);
    dw.dxfString(  6, "BYLAYER");
    dw.dxfString(  0, "DICTIONARY");
    dw.dxfHex(5, 0x19);
    //dw.handle();                           // 17
    //dw.dxfHex(330, 0xC);                       // C
    dw.dxfString(100, "AcDbDictionary");
    dw.dxfInt(280, 0);
    dw.dxfInt(281, 1);
    dw.dxfString(  0, "DICTIONARY");
    //dicId2 = dw.handle();                           // 1A
    dw.dxfHex(5, 0x1A);
    //dw.dxfHex(330, 0xC);
    dw.dxfString(100, "AcDbDictionary");
    dw.dxfInt(281, 1);
    dw.dxfString(  3, "Layout1");
    dw.dxfHex(350, 0x1E);
    //dw.dxfHex(350, dw.getNextHandle()+2);        // 1E
    dw.dxfString(  3, "Layout2");
    dw.dxfHex(350, 0x26);
    //dw.dxfHex(350, dw.getNextHandle()+4);        // 26
    dw.dxfString(  3, "Model");
    dw.dxfHex(350, 0x22);
    //dw.dxfHex(350, dw.getNextHandle()+5);        // 22

    dw.dxfString(  0, "LAYOUT");
    dw.dxfHex(5, 0x1E);
    //dw.handle();                                    // 1E
    //dw.dxfHex(330, dicId2);                      // 1A
    dw.dxfString(100, "AcDbPlotSettings");
    dw.dxfString(  1, "");
    dw.dxfString(  2, "C:\\Program Files\\AutoCAD 2002\\plotters\\DWF ePlot (optimized for plotting).pc3");
    dw.dxfString(  4, "");
    dw.dxfString(  6, "");
    dw.dxfReal( 40, 0.0);
    dw.dxfReal( 41, 0.0);
    dw.dxfReal( 42, 0.0);
    dw.dxfReal( 43, 0.0);
    dw.dxfReal( 44, 0.0);
    dw.dxfReal( 45, 0.0);
    dw.dxfReal( 46, 0.0);
    dw.dxfReal( 47, 0.0);
    dw.dxfReal( 48, 0.0);
    dw.dxfReal( 49, 0.0);
    dw.dxfReal(140, 0.0);
    dw.dxfReal(141, 0.0);
    dw.dxfReal(142, 1.0);
    dw.dxfReal(143, 1.0);
    dw.dxfInt( 70, 688);
    dw.dxfInt( 72, 0);
    dw.dxfInt( 73, 0);
    dw.dxfInt( 74, 5);
    dw.dxfString(  7, "");
    dw.dxfInt( 75, 16);
    dw.dxfReal(147, 1.0);
    dw.dxfReal(148, 0.0);
    dw.dxfReal(149, 0.0);
    dw.dxfString(100, "AcDbLayout");
    dw.dxfString(  1, "Layout1");
    dw.dxfInt( 70, 1);
    dw.dxfInt( 71, 1);
    dw.dxfReal( 10, 0.0);
    dw.dxfReal( 20, 0.0);
    dw.dxfReal( 11, 420.0);
    dw.dxfReal( 21, 297.0);
    dw.dxfReal( 12, 0.0);
    dw.dxfReal( 22, 0.0);
    dw.dxfReal( 32, 0.0);
    dw.dxfReal( 14, 1.000000000000000E+20);
    dw.dxfReal( 24, 1.000000000000000E+20);
    dw.dxfReal( 34, 1.000000000000000E+20);
    dw.dxfReal( 15, -1.000000000000000E+20);
    dw.dxfReal( 25, -1.000000000000000E+20);
    dw.dxfReal( 35, -1.000000000000000E+20);
    dw.dxfReal(146, 0.0);
    dw.dxfReal( 13, 0.0);
    dw.dxfReal( 23, 0.0);
    dw.dxfReal( 33, 0.0);
    dw.dxfReal( 16, 1.0);
    dw.dxfReal( 26, 0.0);
    dw.dxfReal( 36, 0.0);
    dw.dxfReal( 17, 0.0);
    dw.dxfReal( 27, 1.0);
    dw.dxfReal( 37, 0.0);
    dw.dxfInt( 76, 0);
    //dw.dxfHex(330, dw.getPaperSpaceHandle());    // 1B
    dw.dxfHex(330, 0x1B);
    dw.dxfString(  0, "LAYOUT");
    dw.dxfHex(5, 0x22);
    //dw.handle();                                    // 22
    //dw.dxfHex(330, dicId2);                      // 1A
    dw.dxfString(100, "AcDbPlotSettings");
    dw.dxfString(  1, "");
    dw.dxfString(  2, "C:\\Program Files\\AutoCAD 2002\\plotters\\DWF ePlot (optimized for plotting).pc3");
    dw.dxfString(  4, "");
    dw.dxfString(  6, "");
    dw.dxfReal( 40, 0.0);
    dw.dxfReal( 41, 0.0);
    dw.dxfReal( 42, 0.0);
    dw.dxfReal( 43, 0.0);
    dw.dxfReal( 44, 0.0);
    dw.dxfReal( 45, 0.0);
    dw.dxfReal( 46, 0.0);
    dw.dxfReal( 47, 0.0);
    dw.dxfReal( 48, 0.0);
    dw.dxfReal( 49, 0.0);
    dw.dxfReal(140, 0.0);
    dw.dxfReal(141, 0.0);
    dw.dxfReal(142, 1.0);
    dw.dxfReal(143, 1.0);
    dw.dxfInt( 70, 1712);
    dw.dxfInt( 72, 0);
    dw.dxfInt( 73, 0);
    dw.dxfInt( 74, 0);
    dw.dxfString(  7, "");
    dw.dxfInt( 75, 0);
    dw.dxfReal(147, 1.0);
    dw.dxfReal(148, 0.0);
    dw.dxfReal(149, 0.0);
    dw.dxfString(100, "AcDbLayout");
    dw.dxfString(  1, "Model");
    dw.dxfInt( 70, 1);
    dw.dxfInt( 71, 0);
    dw.dxfReal( 10, 0.0);
    dw.dxfReal( 20, 0.0);
    dw.dxfReal( 11, 12.0);
    dw.dxfReal( 21, 9.0);
    dw.dxfReal( 12, 0.0);
    dw.dxfReal( 22, 0.0);
    dw.dxfReal( 32, 0.0);
    dw.dxfReal( 14, 0.0);
    dw.dxfReal( 24, 0.0);
    dw.dxfReal( 34, 0.0);
    dw.dxfReal( 15, 0.0);
    dw.dxfReal( 25, 0.0);
    dw.dxfReal( 35, 0.0);
    dw.dxfReal(146, 0.0);
    dw.dxfReal( 13, 0.0);
    dw.dxfReal( 23, 0.0);
    dw.dxfReal( 33, 0.0);
    dw.dxfReal( 16, 1.0);
    dw.dxfReal( 26, 0.0);
    dw.dxfReal( 36, 0.0);
    dw.dxfReal( 17, 0.0);
    dw.dxfReal( 27, 1.0);
    dw.dxfReal( 37, 0.0);
    dw.dxfInt( 76, 0);
    //dw.dxfHex(330, dw.getModelSpaceHandle());    // 1F
    dw.dxfHex(330, 0x1F);
    dw.dxfString(  0, "LAYOUT");
    //dw.handle();                                    // 26
    dw.dxfHex(5, 0x26);
    //dw.dxfHex(330, dicId2);                      // 1A
    dw.dxfString(100, "AcDbPlotSettings");
    dw.dxfString(  1, "");
    dw.dxfString(  2, "C:\\Program Files\\AutoCAD 2002\\plotters\\DWF ePlot (optimized for plotting).pc3");
    dw.dxfString(  4, "");
    dw.dxfString(  6, "");
    dw.dxfReal( 40, 0.0);
    dw.dxfReal( 41, 0.0);
    dw.dxfReal( 42, 0.0);
    dw.dxfReal( 43, 0.0);
    dw.dxfReal( 44, 0.0);
    dw.dxfReal( 45, 0.0);
    dw.dxfReal( 46, 0.0);
    dw.dxfReal( 47, 0.0);
    dw.dxfReal( 48, 0.0);
    dw.dxfReal( 49, 0.0);
    dw.dxfReal(140, 0.0);
    dw.dxfReal(141, 0.0);
    dw.dxfReal(142, 1.0);
    dw.dxfReal(143, 1.0);
    dw.dxfInt( 70, 688);
    dw.dxfInt( 72, 0);
    dw.dxfInt( 73, 0);
    dw.dxfInt( 74, 5);
    dw.dxfString(  7, "");
    dw.dxfInt( 75, 16);
    dw.dxfReal(147, 1.0);
    dw.dxfReal(148, 0.0);
    dw.dxfReal(149, 0.0);
    dw.dxfString(100, "AcDbLayout");
    dw.dxfString(  1, "Layout2");
    dw.dxfInt( 70, 1);
    dw.dxfInt( 71, 2);
    dw.dxfReal( 10, 0.0);
    dw.dxfReal( 20, 0.0);
    dw.dxfReal( 11, 12.0);
    dw.dxfReal( 21, 9.0);
    dw.dxfReal( 12, 0.0);
    dw.dxfReal( 22, 0.0);
    dw.dxfReal( 32, 0.0);
    dw.dxfReal( 14, 0.0);
    dw.dxfReal( 24, 0.0);
    dw.dxfReal( 34, 0.0);
    dw.dxfReal( 15, 0.0);
    dw.dxfReal( 25, 0.0);
    dw.dxfReal( 35, 0.0);
    dw.dxfReal(146, 0.0);
    dw.dxfReal( 13, 0.0);
    dw.dxfReal( 23, 0.0);
    dw.dxfReal( 33, 0.0);
    dw.dxfReal( 16, 1.0);
    dw.dxfReal( 26, 0.0);
    dw.dxfReal( 36, 0.0);
    dw.dxfReal( 17, 0.0);
    dw.dxfReal( 27, 1.0);
    dw.dxfReal( 37, 0.0);
    dw.dxfInt( 76, 0);
    //dw.dxfHex(330, dw.getPaperSpace0Handle());   // 23
    dw.dxfHex(330, 0x23);
    dw.dxfString(  0, "DICTIONARY");
    //dw.dxfHex(5, 0x2C);
    //dicId5 =
    dw.handle();                           // 2C
    //dw.dxfHex(330, 0xC);                       // C
    dw.dxfString(100, "AcDbDictionary");
    dw.dxfInt(281, 1);
    dw.dxfString(  3, "DIMASSOC");
    //dw.dxfHex(350, 0x2F);
    dw.dxfHex(350, dw.getNextHandle()+1);        // 2E
    dw.dxfString(  3, "HIDETEXT");
    //dw.dxfHex(350, 0x2E);
    dw.dxfHex(350, dw.getNextHandle());        // 2D
    dw.dxfString(  0, "DICTIONARYVAR");
    //dw.dxfHex(5, 0x2E);
    dw.handle();                                    // 2E
    //dw.dxfHex(330, dicId5);                      // 2C
    dw.dxfString(100, "DictionaryVariables");
    dw.dxfInt(280, 0);
    dw.dxfInt(  1, 2);
    dw.dxfString(  0, "DICTIONARYVAR");
    //dw.dxfHex(5, 0x2D);
    dw.handle();                                    // 2D
    //dw.dxfHex(330, dicId5);                      // 2C
    dw.dxfString(100, "DictionaryVariables");
    dw.dxfInt(280, 0);
    dw.dxfInt(  1, 1);
}


/**
 * Writes the end of the objects section. This section is needed in VER_R13.
 * Note that this method currently only writes a faked OBJECTS section
 * to make the file readable by Aut*cad.
 */
void DL_Dxf::writeObjectsEnd(DL_WriterA& dw) {
    dw.dxfString(  0, "ENDSEC");
}



/**
 * Checks if the given variable is known by the given DXF version.
 */
bool DL_Dxf::checkVariable(const char* var, DL_Codes::version version) {
    if (version>=VER_2000) {
        return true;
    } else if (version==VER_R12) {
        // these are all the variables recognized by dxf r12:
        if (!strcmp(var, "$ACADVER")) {
            return true;
        }
        if (!strcmp(var, "$ACADVER")) {
            return true;
        }
        if (!strcmp(var, "$ANGBASE")) {
            return true;
        }
        if (!strcmp(var, "$ANGDIR")) {
            return true;
        }
        if (!strcmp(var, "$ATTDIA")) {
            return true;
        }
        if (!strcmp(var, "$ATTMODE")) {
            return true;
        }
        if (!strcmp(var, "$ATTREQ")) {
            return true;
        }
        if (!strcmp(var, "$AUNITS")) {
            return true;
        }
        if (!strcmp(var, "$AUPREC")) {
            return true;
        }
        if (!strcmp(var, "$AXISMODE")) {
            return true;
        }
        if (!strcmp(var, "$AXISUNIT")) {
            return true;
        }
        if (!strcmp(var, "$BLIPMODE")) {
            return true;
        }
        if (!strcmp(var, "$CECOLOR")) {
            return true;
        }
        if (!strcmp(var, "$CELTYPE")) {
            return true;
        }
        if (!strcmp(var, "$CHAMFERA")) {
            return true;
        }
        if (!strcmp(var, "$CHAMFERB")) {
            return true;
        }
        if (!strcmp(var, "$CLAYER")) {
            return true;
        }
        if (!strcmp(var, "$COORDS")) {
            return true;
        }
        if (!strcmp(var, "$DIMALT")) {
            return true;
        }
        if (!strcmp(var, "$DIMALTD")) {
            return true;
        }
        if (!strcmp(var, "$DIMALTF")) {
            return true;
        }
        if (!strcmp(var, "$DIMAPOST")) {
            return true;
        }
        if (!strcmp(var, "$DIMASO")) {
            return true;
        }
        if (!strcmp(var, "$DIMASZ")) {
            return true;
        }
        if (!strcmp(var, "$DIMBLK")) {
            return true;
        }
        if (!strcmp(var, "$DIMBLK1")) {
            return true;
        }
        if (!strcmp(var, "$DIMBLK2")) {
            return true;
        }
        if (!strcmp(var, "$DIMCEN")) {
            return true;
        }
        if (!strcmp(var, "$DIMCLRD")) {
            return true;
        }
        if (!strcmp(var, "$DIMCLRE")) {
            return true;
        }
        if (!strcmp(var, "$DIMCLRT")) {
            return true;
        }
        if (!strcmp(var, "$DIMDLE")) {
            return true;
        }
        if (!strcmp(var, "$DIMDLI")) {
            return true;
        }
        if (!strcmp(var, "$DIMEXE")) {
            return true;
        }
        if (!strcmp(var, "$DIMEXO")) {
            return true;
        }
        if (!strcmp(var, "$DIMGAP")) {
            return true;
        }
        if (!strcmp(var, "$DIMLFAC")) {
            return true;
        }
        if (!strcmp(var, "$DIMLIM")) {
            return true;
        }
        if (!strcmp(var, "$DIMPOST")) {
            return true;
        }
        if (!strcmp(var, "$DIMRND")) {
            return true;
        }
        if (!strcmp(var, "$DIMSAH")) {
            return true;
        }
        if (!strcmp(var, "$DIMSCALE")) {
            return true;
        }
        if (!strcmp(var, "$DIMSE1")) {
            return true;
        }
        if (!strcmp(var, "$DIMSE2")) {
            return true;
        }
        if (!strcmp(var, "$DIMSHO")) {
            return true;
        }
        if (!strcmp(var, "$DIMSOXD")) {
            return true;
        }
        if (!strcmp(var, "$DIMSTYLE")) {
            return true;
        }
        if (!strcmp(var, "$DIMTAD")) {
            return true;
        }
        if (!strcmp(var, "$DIMTFAC")) {
            return true;
        }
        if (!strcmp(var, "$DIMTIH")) {
            return true;
        }
        if (!strcmp(var, "$DIMTIX")) {
            return true;
        }
        if (!strcmp(var, "$DIMTM")) {
            return true;
        }
        if (!strcmp(var, "$DIMTOFL")) {
            return true;
        }
        if (!strcmp(var, "$DIMTOH")) {
            return true;
        }
        if (!strcmp(var, "$DIMTOL")) {
            return true;
        }
        if (!strcmp(var, "$DIMTP")) {
            return true;
        }
        if (!strcmp(var, "$DIMTSZ")) {
            return true;
        }
        if (!strcmp(var, "$DIMTVP")) {
            return true;
        }
        if (!strcmp(var, "$DIMTXT")) {
            return true;
        }
        if (!strcmp(var, "$DIMZIN")) {
            return true;
        }
        if (!strcmp(var, "$DWGCODEPAGE")) {
            return true;
        }
        if (!strcmp(var, "$DRAGMODE")) {
            return true;
        }
        if (!strcmp(var, "$ELEVATION")) {
            return true;
        }
        if (!strcmp(var, "$EXTMAX")) {
            return true;
        }
        if (!strcmp(var, "$EXTMIN")) {
            return true;
        }
        if (!strcmp(var, "$FILLETRAD")) {
            return true;
        }
        if (!strcmp(var, "$FILLMODE")) {
            return true;
        }
        if (!strcmp(var, "$HANDLING")) {
            return true;
        }
        if (!strcmp(var, "$HANDSEED")) {
            return true;
        }
        if (!strcmp(var, "$INSBASE")) {
            return true;
        }
        if (!strcmp(var, "$LIMCHECK")) {
            return true;
        }
        if (!strcmp(var, "$LIMMAX")) {
            return true;
        }
        if (!strcmp(var, "$LIMMIN")) {
            return true;
        }
        if (!strcmp(var, "$LTSCALE")) {
            return true;
        }
        if (!strcmp(var, "$LUNITS")) {
            return true;
        }
        if (!strcmp(var, "$LUPREC")) {
            return true;
        }
        if (!strcmp(var, "$MAXACTVP")) {
            return true;
        }
        if (!strcmp(var, "$MENU")) {
            return true;
        }
        if (!strcmp(var, "$MIRRTEXT")) {
            return true;
        }
        if (!strcmp(var, "$ORTHOMODE")) {
            return true;
        }
        if (!strcmp(var, "$OSMODE")) {
            return true;
        }
        if (!strcmp(var, "$PDMODE")) {
            return true;
        }
        if (!strcmp(var, "$PDSIZE")) {
            return true;
        }
        if (!strcmp(var, "$PELEVATION")) {
            return true;
        }
        if (!strcmp(var, "$PEXTMAX")) {
            return true;
        }
        if (!strcmp(var, "$PEXTMIN")) {
            return true;
        }
        if (!strcmp(var, "$PLIMCHECK")) {
            return true;
        }
        if (!strcmp(var, "$PLIMMAX")) {
            return true;
        }
        if (!strcmp(var, "$PLIMMIN")) {
            return true;
        }
        if (!strcmp(var, "$PLINEGEN")) {
            return true;
        }
        if (!strcmp(var, "$PLINEWID")) {
            return true;
        }
        if (!strcmp(var, "$PSLTSCALE")) {
            return true;
        }
        if (!strcmp(var, "$PUCSNAME")) {
            return true;
        }
        if (!strcmp(var, "$PUCSORG")) {
            return true;
        }
        if (!strcmp(var, "$PUCSXDIR")) {
            return true;
        }
        if (!strcmp(var, "$PUCSYDIR")) {
            return true;
        }
        if (!strcmp(var, "$QTEXTMODE")) {
            return true;
        }
        if (!strcmp(var, "$REGENMODE")) {
            return true;
        }
        if (!strcmp(var, "$SHADEDGE")) {
            return true;
        }
        if (!strcmp(var, "$SHADEDIF")) {
            return true;
        }
        if (!strcmp(var, "$SKETCHINC")) {
            return true;
        }
        if (!strcmp(var, "$SKPOLY")) {
            return true;
        }
        if (!strcmp(var, "$SPLFRAME")) {
            return true;
        }
        if (!strcmp(var, "$SPLINESEGS")) {
            return true;
        }
        if (!strcmp(var, "$SPLINETYPE")) {
            return true;
        }
        if (!strcmp(var, "$SURFTAB1")) {
            return true;
        }
        if (!strcmp(var, "$SURFTAB2")) {
            return true;
        }
        if (!strcmp(var, "$SURFTYPE")) {
            return true;
        }
        if (!strcmp(var, "$SURFU")) {
            return true;
        }
        if (!strcmp(var, "$SURFV")) {
            return true;
        }
        if (!strcmp(var, "$TDCREATE")) {
            return true;
        }
        if (!strcmp(var, "$TDINDWG")) {
            return true;
        }
        if (!strcmp(var, "$TDUPDATE")) {
            return true;
        }
        if (!strcmp(var, "$TDUSRTIMER")) {
            return true;
        }
        if (!strcmp(var, "$TEXTSIZE")) {
            return true;
        }
        if (!strcmp(var, "$TEXTSTYLE")) {
            return true;
        }
        if (!strcmp(var, "$THICKNESS")) {
            return true;
        }
        if (!strcmp(var, "$TILEMODE")) {
            return true;
        }
        if (!strcmp(var, "$TRACEWID")) {
            return true;
        }
        if (!strcmp(var, "$UCSNAME")) {
            return true;
        }
        if (!strcmp(var, "$UCSORG")) {
            return true;
        }
        if (!strcmp(var, "$UCSXDIR")) {
            return true;
        }
        if (!strcmp(var, "$UCSYDIR")) {
            return true;
        }
        if (!strcmp(var, "$UNITMODE")) {
            return true;
        }
        if (!strcmp(var, "$USERI1")) {
            return true;
        }
        if (!strcmp(var, "$USERR1")) {
            return true;
        }
        if (!strcmp(var, "$USRTIMER")) {
            return true;
        }
        if (!strcmp(var, "$VISRETAIN")) {
            return true;
        }
        if (!strcmp(var, "$WORLDVIEW")) {
            return true;
        }
        if (!strcmp(var, "$FASTZOOM")) {
            return true;
        }
        if (!strcmp(var, "$GRIDMODE")) {
            return true;
        }
        if (!strcmp(var, "$GRIDUNIT")) {
            return true;
        }
        if (!strcmp(var, "$SNAPANG")) {
            return true;
        }
        if (!strcmp(var, "$SNAPBASE")) {
            return true;
        }
        if (!strcmp(var, "$SNAPISOPAIR")) {
            return true;
        }
        if (!strcmp(var, "$SNAPMODE")) {
            return true;
        }
        if (!strcmp(var, "$SNAPSTYLE")) {
            return true;
        }
        if (!strcmp(var, "$SNAPUNIT")) {
            return true;
        }
        if (!strcmp(var, "$VIEWCTR")) {
            return true;
        }
        if (!strcmp(var, "$VIEWDIR")) {
            return true;
        }
        if (!strcmp(var, "$VIEWSIZE")) {
            return true;
        }
        return false;
    }

    return false;
}



/**
 * @returns the library version as int (4 bytes, each byte one version number).
 * e.g. if str = "2.0.2.0" getLibVersion returns 0x02000200
 */
int DL_Dxf::getLibVersion(const char* str) {
    int d[4];
    int idx = 0;
    char v[4][5];
    int ret = 0;

    for (unsigned int i=0; i<strlen(str) && idx<3; ++i) {
        if (str[i]=='.') {
            d[idx] = i;
            idx++;
        }
    }

    if (idx==3) {
        d[3] = strlen(str);

        strncpy(v[0], str, d[0]);
        v[0][d[0]] = '\0';
        //std::cout << "v[0]: " << atoi(v[0]) << "\n";

        strncpy(v[1], &str[d[0]+1], d[1]-d[0]-1);
        v[1][d[1]-d[0]-1] = '\0';
        //std::cout << "v[1]: " << atoi(v[1]) << "\n";

        strncpy(v[2], &str[d[1]+1], d[2]-d[1]-1);
        v[2][d[2]-d[1]-1] = '\0';
        //std::cout << "v[2]: " << atoi(v[2]) << "\n";

        strncpy(v[3], &str[d[2]+1], d[3]-d[2]-1);
        v[3][d[3]-d[2]-1] = '\0';
        //std::cout << "v[3]: " << atoi(v[3]) << "\n";

        ret = (atoi(v[0])<<(3*8)) +
              (atoi(v[1])<<(2*8)) +
              (atoi(v[2])<<(1*8)) +
              (atoi(v[3])<<(0*8));

        return ret;
    } else {
        std::cerr << "DL_Dxf::getLibVersion: invalid version number: " << str << "\n";
        return 0;
    }
}



/**
 * Some test routines.
 */
void DL_Dxf::test() {
    char* buf1;
    char* buf2;
    char* buf3;
    char* buf4;
    char* buf5;
    char* buf6;

    buf1 = new char[10];
    buf2 = new char[10];
    buf3 = new char[10];
    buf4 = new char[10];
    buf5 = new char[10];
    buf6 = new char[10];

    strcpy(buf1, "  10\n");
    strcpy(buf2, "10");
    strcpy(buf3, "10\n");
    strcpy(buf4, "  10 \n");
    strcpy(buf5, "  10 \r");
    strcpy(buf6, "\t10 \n");

    std::cout << "1 buf1: '" << buf1 << "'\n";
    stripWhiteSpace(&buf1);
    std::cout << "2 buf1: '" << buf1 << "'\n";
    //assert(!strcmp(buf1, "10"));

    std::cout << "1 buf2: '" << buf2 << "'\n";
    stripWhiteSpace(&buf2);
    std::cout << "2 buf2: '" << buf2 << "'\n";

    std::cout << "1 buf3: '" << buf3 << "'\n";
    stripWhiteSpace(&buf3);
    std::cout << "2 buf3: '" << buf3 << "'\n";

    std::cout << "1 buf4: '" << buf4 << "'\n";
    stripWhiteSpace(&buf4);
    std::cout << "2 buf4: '" << buf4 << "'\n";

    std::cout << "1 buf5: '" << buf5 << "'\n";
    stripWhiteSpace(&buf5);
    std::cout << "2 buf5: '" << buf5 << "'\n";

    std::cout << "1 buf6: '" << buf6 << "'\n";
    stripWhiteSpace(&buf6);
    std::cout << "2 buf6: '" << buf6 << "'\n";

}


