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	// SPDX-License-Identifier: BSD-3-Clause

	// dxf.cpp
	// Copyright (c) 2009, Dan Heeks
	// This program is released under the BSD license. See the file COPYING for details.
	// modified 2018 wandererfan


	#include <cmath>
	#include <fstream>
	#include <iomanip>
	#include <iostream>
	#include <sstream>
	#include <exception>
	#include <string>

	#include "dxf.h"
	#include <App/Application.h>
	#include <Base/Color.h>
	#include <Base/Console.h>
	#include <Base/Exception.h>
	#include <Base/FileInfo.h>
	#include <Base/Interpreter.h>
	#include <Base/Stream.h>
	#include <Base/Tools.h>
	#include <Base/Vector3D.h>


	using namespace std;

	namespace
	{

	std::string DxfUnitToString(DxfUnits::eDxfUnits_t unit)
	{
	switch (unit) {
	case DxfUnits::eInches:
	return "Inches";
	case DxfUnits::eFeet:
	return "Feet";
	case DxfUnits::eMiles:
	return "Miles";
	case DxfUnits::eMillimeters:
	return "Millimeters";
	case DxfUnits::eCentimeters:
	return "Centimeters";
	case DxfUnits::eMeters:
	return "Meters";
	case DxfUnits::eKilometers:
	return "Kilometers";
	case DxfUnits::eMicroinches:
	return "Microinches";
	case DxfUnits::eMils:
	return "Mils";
	case DxfUnits::eYards:
	return "Yards";
	case DxfUnits::eAngstroms:
	return "Angstroms";
	case DxfUnits::eNanometers:
	return "Nanometers";
	case DxfUnits::eMicrons:
	return "Microns";
	case DxfUnits::eDecimeters:
	return "Decimeters";
	case DxfUnits::eDekameters:
	return "Dekameters";
	case DxfUnits::eHectometers:
	return "Hectometers";
	case DxfUnits::eGigameters:
	return "Gigameters";
	case DxfUnits::eAstronomicalUnits:
	return "Astronomical Units";
	case DxfUnits::eLightYears:
	return "Light Years";
	case DxfUnits::eParsecs:
	return "Parsecs";
	case DxfUnits::eUnspecified:
	default:
	return "Unspecified";
	}
	}

	} // namespace

	static Base::Vector3d MakeVector3d(const double coordinates[3])
	{
	// NOLINTNEXTLINE(readability/nolint)
	// NOLINTNEXTLINE(cppcoreguidelines-pro-bounds-pointer-arithmetic)
	return Base::Vector3d(coordinates[0], coordinates[1], coordinates[2]);
	}

	CDxfWrite::CDxfWrite(const char* filepath)
	: // TODO: these should probably be parameters in config file
	// handles:
	// boilerplate 0 - A00
	// used by dxf.cpp A01 - FFFE
	// ACAD HANDSEED FFFF

	m_fail(false)
	, m_ssBlock(new std::ostringstream())
	, m_ssBlkRecord(new std::ostringstream())
	, m_ssEntity(new std::ostringstream())
	, m_ssLayer(new std::ostringstream())
	, m_version(12)
	, m_handle(0xA00)
	, // room for 2560 handles in boilerplate files
	// m_entityHandle(0x300), //don't need special ranges for handles
	// m_layerHandle(0x30),
	// m_blockHandle(0x210),
	// m_blkRecordHandle(0x110),
	m_polyOverride(false)
	, m_layerName("none")
	{
	// start the file
	Base::FileInfo fi(filepath);
	m_ofs = new Base::ofstream(fi, ios::out);

	if (!(*m_ofs)) {
	m_fail = true;
	return;
	}
	m_ofs->imbue(std::locale("C"));

	// use lots of digits to avoid rounding errors
	m_ssEntity->setf(std::ios::fixed);
	m_ssEntity->precision(9);
	}

	CDxfWrite::~CDxfWrite()
	{
	delete m_ofs;
	delete m_ssBlock;
	delete m_ssBlkRecord;
	delete m_ssEntity;
	delete m_ssLayer;
	}

	void CDxfWrite::init()
	{
	writeHeaderSection();
	makeBlockRecordTableHead();
	makeBlockSectionHead();
	}

	//! assemble pieces into output file
	void CDxfWrite::endRun()
	{
	makeLayerTable();
	makeBlockRecordTableBody();

	writeClassesSection();
	writeTablesSection();
	writeBlocksSection();
	writeEntitiesSection();
	writeObjectsSection();

	(*m_ofs) << " 0" << endl;
	(*m_ofs) << "EOF";
	}

	//***************************
	// writeHeaderSection
	// added by Wandererfan 2018 (wandererfan@gmail.com) for FreeCAD project
	void CDxfWrite::writeHeaderSection()
	{
	std::stringstream ss;
	ss << "FreeCAD v" << App::Application::Config()["BuildVersionMajor"] << "."
	<< App::Application::Config()["BuildVersionMinor"] << " "
	<< App::Application::Config()["BuildRevision"];

	// header & version
	(*m_ofs) << "999" << endl;
	(*m_ofs) << ss.str() << endl;

	// static header content
	ss.str("");
	ss.clear();
	ss << "header" << m_version << ".rub";
	std::string fileSpec = m_dataDir + ss.str();
	(*m_ofs) << getPlateFile(fileSpec);
	}

	//***************************
	// writeClassesSection
	// added by Wandererfan 2018 (wandererfan@gmail.com) for FreeCAD project
	void CDxfWrite::writeClassesSection()
	{
	if (m_version < 14) {
	return;
	}

	// static classes section content
	std::stringstream ss;
	ss << "classes" << m_version << ".rub";
	std::string fileSpec = m_dataDir + ss.str();
	(*m_ofs) << getPlateFile(fileSpec);
	}

	//***************************
	// writeTablesSection
	// added by Wandererfan 2018 (wandererfan@gmail.com) for FreeCAD project
	void CDxfWrite::writeTablesSection()
	{
	// static tables section head end content
	std::stringstream ss;
	ss << "tables1" << m_version << ".rub";
	std::string fileSpec = m_dataDir + ss.str();
	(*m_ofs) << getPlateFile(fileSpec);

	(m_ofs) << (m_ssLayer).str();

	// static tables section tail end content
	ss.str("");
	ss.clear();
	ss << "tables2" << m_version << ".rub";
	fileSpec = m_dataDir + ss.str();
	(*m_ofs) << getPlateFile(fileSpec);

	if (m_version > 12) {
	(m_ofs) << (m_ssBlkRecord).str();
	(*m_ofs) << " 0" << endl;
	(*m_ofs) << "ENDTAB" << endl;
	}
	(*m_ofs) << " 0" << endl;
	(*m_ofs) << "ENDSEC" << endl;
	}

	//***************************
	// makeLayerTable
	// added by Wandererfan 2018 (wandererfan@gmail.com) for FreeCAD project
	void CDxfWrite::makeLayerTable()
	{
	std::string tablehash = getLayerHandle();
	(*m_ssLayer) << " 0" << endl;
	(*m_ssLayer) << "TABLE" << endl;
	(*m_ssLayer) << " 2" << endl;
	(*m_ssLayer) << "LAYER" << endl;
	(*m_ssLayer) << " 5" << endl;
	(*m_ssLayer) << tablehash << endl;
	if (m_version > 12) {
	(*m_ssLayer) << "330" << endl;
	(*m_ssLayer) << 0 << endl;
	(*m_ssLayer) << "100" << endl;
	(*m_ssLayer) << "AcDbSymbolTable" << endl;
	}
	(*m_ssLayer) << " 70" << endl;
	(*m_ssLayer) << m_layerList.size() + 1 << endl;

	(*m_ssLayer) << " 0" << endl;
	(*m_ssLayer) << "LAYER" << endl;
	(*m_ssLayer) << " 5" << endl;
	(*m_ssLayer) << getLayerHandle() << endl;
	if (m_version > 12) {
	(*m_ssLayer) << "330" << endl;
	(*m_ssLayer) << tablehash << endl;
	(*m_ssLayer) << "100" << endl;
	(*m_ssLayer) << "AcDbSymbolTableRecord" << endl;
	(*m_ssLayer) << "100" << endl;
	(*m_ssLayer) << "AcDbLayerTableRecord" << endl;
	}
	(*m_ssLayer) << " 2" << endl;
	(*m_ssLayer) << "0" << endl;
	(*m_ssLayer) << " 70" << endl;
	(*m_ssLayer) << " 0" << endl;
	(*m_ssLayer) << " 62" << endl;
	(*m_ssLayer) << " 7" << endl;
	(*m_ssLayer) << " 6" << endl;
	(*m_ssLayer) << "CONTINUOUS" << endl;

	for (auto& l : m_layerList) {
	(*m_ssLayer) << " 0" << endl;
	(*m_ssLayer) << "LAYER" << endl;
	(*m_ssLayer) << " 5" << endl;
	(*m_ssLayer) << getLayerHandle() << endl;
	if (m_version > 12) {
	(*m_ssLayer) << "330" << endl;
	(*m_ssLayer) << tablehash << endl;
	(*m_ssLayer) << "100" << endl;
	(*m_ssLayer) << "AcDbSymbolTableRecord" << endl;
	(*m_ssLayer) << "100" << endl;
	(*m_ssLayer) << "AcDbLayerTableRecord" << endl;
	}
	(*m_ssLayer) << " 2" << endl;
	(*m_ssLayer) << l << endl;
	(*m_ssLayer) << " 70" << endl;
	(*m_ssLayer) << " 0" << endl;
	(*m_ssLayer) << " 62" << endl;
	(*m_ssLayer) << " 7" << endl;
	(*m_ssLayer) << " 6" << endl;
	(*m_ssLayer) << "CONTINUOUS" << endl;
	}
	(*m_ssLayer) << " 0" << endl;
	(*m_ssLayer) << "ENDTAB" << endl;
	}

	//***************************
	// makeBlockRecordTableHead
	// added by Wandererfan 2018 (wandererfan@gmail.com) for FreeCAD project
	void CDxfWrite::makeBlockRecordTableHead()
	{
	if (m_version < 14) {
	return;
	}
	std::string tablehash = getBlkRecordHandle();
	m_saveBlockRecordTableHandle = tablehash;
	(*m_ssBlkRecord) << " 0" << endl;
	(*m_ssBlkRecord) << "TABLE" << endl;
	(*m_ssBlkRecord) << " 2" << endl;
	(*m_ssBlkRecord) << "BLOCK_RECORD" << endl;
	(*m_ssBlkRecord) << " 5" << endl;
	(*m_ssBlkRecord) << tablehash << endl;
	(*m_ssBlkRecord) << "330" << endl;
	(*m_ssBlkRecord) << "0" << endl;
	(*m_ssBlkRecord) << "100" << endl;
	(*m_ssBlkRecord) << "AcDbSymbolTable" << endl;
	(*m_ssBlkRecord) << " 70" << endl;
	(*m_ssBlkRecord) << (m_blockList.size() + 5) << endl;

	m_saveModelSpaceHandle = getBlkRecordHandle();
	(*m_ssBlkRecord) << " 0" << endl;
	(*m_ssBlkRecord) << "BLOCK_RECORD" << endl;
	(*m_ssBlkRecord) << " 5" << endl;
	(*m_ssBlkRecord) << m_saveModelSpaceHandle << endl;
	(*m_ssBlkRecord) << "330" << endl;
	(*m_ssBlkRecord) << tablehash << endl;
	(*m_ssBlkRecord) << "100" << endl;
	(*m_ssBlkRecord) << "AcDbSymbolTableRecord" << endl;
	(*m_ssBlkRecord) << "100" << endl;
	(*m_ssBlkRecord) << "AcDbBlockTableRecord" << endl;
	(*m_ssBlkRecord) << " 2" << endl;
	(m_ssBlkRecord) << "MODEL_SPACE" << endl;
	// (*m_ssBlkRecord) << " 1" << endl;
	// (*m_ssBlkRecord) << " " << endl;

	m_savePaperSpaceHandle = getBlkRecordHandle();
	(*m_ssBlkRecord) << " 0" << endl;
	(*m_ssBlkRecord) << "BLOCK_RECORD" << endl;
	(*m_ssBlkRecord) << " 5" << endl;
	(*m_ssBlkRecord) << m_savePaperSpaceHandle << endl;
	(*m_ssBlkRecord) << "330" << endl;
	(*m_ssBlkRecord) << tablehash << endl;
	(*m_ssBlkRecord) << "100" << endl;
	(*m_ssBlkRecord) << "AcDbSymbolTableRecord" << endl;
	(*m_ssBlkRecord) << "100" << endl;
	(*m_ssBlkRecord) << "AcDbBlockTableRecord" << endl;
	(*m_ssBlkRecord) << " 2" << endl;
	(m_ssBlkRecord) << "PAPER_SPACE" << endl;
	// (*m_ssBlkRecord) << " 1" << endl;
	// (*m_ssBlkRecord) << " " << endl;
	}

	//***************************
	// makeBlockRecordTableBody
	// added by Wandererfan 2018 (wandererfan@gmail.com) for FreeCAD project
	void CDxfWrite::makeBlockRecordTableBody()
	{
	if (m_version < 14) {
	return;
	}

	int iBlkRecord = 0;
	for (auto& b : m_blockList) {
	(*m_ssBlkRecord) << " 0" << endl;
	(*m_ssBlkRecord) << "BLOCK_RECORD" << endl;
	(*m_ssBlkRecord) << " 5" << endl;
	(*m_ssBlkRecord) << m_blkRecordList.at(iBlkRecord) << endl;
	(*m_ssBlkRecord) << "330" << endl;
	(*m_ssBlkRecord) << m_saveBlockRecordTableHandle << endl;
	(*m_ssBlkRecord) << "100" << endl;
	(*m_ssBlkRecord) << "AcDbSymbolTableRecord" << endl;
	(*m_ssBlkRecord) << "100" << endl;
	(*m_ssBlkRecord) << "AcDbBlockTableRecord" << endl;
	(*m_ssBlkRecord) << " 2" << endl;
	(*m_ssBlkRecord) << b << endl;
	// (*m_ssBlkRecord) << " 70" << endl;
	// (*m_ssBlkRecord) << " 0" << endl;
	iBlkRecord++;
	}
	}

	//***************************
	// makeBlockSectionHead
	// added by Wandererfan 2018 (wandererfan@gmail.com) for FreeCAD project
	void CDxfWrite::makeBlockSectionHead()
	{
	(*m_ssBlock) << " 0" << endl;
	(*m_ssBlock) << "SECTION" << endl;
	(*m_ssBlock) << " 2" << endl;
	(*m_ssBlock) << "BLOCKS" << endl;
	(*m_ssBlock) << " 0" << endl;
	(*m_ssBlock) << "BLOCK" << endl;
	(*m_ssBlock) << " 5" << endl;
	m_currentBlock = getBlockHandle();
	(*m_ssBlock) << m_currentBlock << endl;
	if (m_version > 12) {
	(*m_ssBlock) << "330" << endl;
	(*m_ssBlock) << m_saveModelSpaceHandle << endl;
	(*m_ssBlock) << "100" << endl;
	(*m_ssBlock) << "AcDbEntity" << endl;
	}
	(*m_ssBlock) << " 8" << endl;
	(*m_ssBlock) << "0" << endl;
	if (m_version > 12) {
	(*m_ssBlock) << "100" << endl;
	(*m_ssBlock) << "AcDbBlockBegin" << endl;
	}
	(*m_ssBlock) << " 2" << endl;
	(m_ssBlock) << "MODEL_SPACE" << endl;
	(*m_ssBlock) << " 70" << endl;
	(*m_ssBlock) << " 0" << endl;
	(*m_ssBlock) << " 10" << endl;
	(*m_ssBlock) << 0.0 << endl;
	(*m_ssBlock) << " 20" << endl;
	(*m_ssBlock) << 0.0 << endl;
	(*m_ssBlock) << " 30" << endl;
	(*m_ssBlock) << 0.0 << endl;
	(*m_ssBlock) << " 3" << endl;
	(m_ssBlock) << "MODEL_SPACE" << endl;
	(*m_ssBlock) << " 1" << endl;
	(*m_ssBlock) << " " << endl;
	(*m_ssBlock) << " 0" << endl;
	(*m_ssBlock) << "ENDBLK" << endl;
	(*m_ssBlock) << " 5" << endl;
	(*m_ssBlock) << getBlockHandle() << endl;
	if (m_version > 12) {
	(*m_ssBlock) << "330" << endl;
	(*m_ssBlock) << m_saveModelSpaceHandle << endl;
	(*m_ssBlock) << "100" << endl;
	(*m_ssBlock) << "AcDbEntity" << endl;
	}
	(*m_ssBlock) << " 8" << endl;
	(*m_ssBlock) << "0" << endl;
	if (m_version > 12) {
	(*m_ssBlock) << "100" << endl;
	(*m_ssBlock) << "AcDbBlockEnd" << endl;
	}

	(*m_ssBlock) << " 0" << endl;
	(*m_ssBlock) << "BLOCK" << endl;
	(*m_ssBlock) << " 5" << endl;
	m_currentBlock = getBlockHandle();
	(*m_ssBlock) << m_currentBlock << endl;
	if (m_version > 12) {
	(*m_ssBlock) << "330" << endl;
	(*m_ssBlock) << m_savePaperSpaceHandle << endl;
	(*m_ssBlock) << "100" << endl;
	(*m_ssBlock) << "AcDbEntity" << endl;
	(*m_ssBlock) << " 67" << endl;
	(*m_ssBlock) << "1" << endl;
	}
	(*m_ssBlock) << " 8" << endl;
	(*m_ssBlock) << "0" << endl;
	if (m_version > 12) {
	(*m_ssBlock) << "100" << endl;
	(*m_ssBlock) << "AcDbBlockBegin" << endl;
	}
	(*m_ssBlock) << " 2" << endl;
	(m_ssBlock) << "PAPER_SPACE" << endl;
	(*m_ssBlock) << " 70" << endl;
	(*m_ssBlock) << " 0" << endl;
	(*m_ssBlock) << " 10" << endl;
	(*m_ssBlock) << 0.0 << endl;
	(*m_ssBlock) << " 20" << endl;
	(*m_ssBlock) << 0.0 << endl;
	(*m_ssBlock) << " 30" << endl;
	(*m_ssBlock) << 0.0 << endl;
	(*m_ssBlock) << " 3" << endl;
	(m_ssBlock) << "PAPER_SPACE" << endl;
	(*m_ssBlock) << " 1" << endl;
	(*m_ssBlock) << " " << endl;
	(*m_ssBlock) << " 0" << endl;
	(*m_ssBlock) << "ENDBLK" << endl;
	(*m_ssBlock) << " 5" << endl;
	(*m_ssBlock) << getBlockHandle() << endl;
	if (m_version > 12) {
	(*m_ssBlock) << "330" << endl;
	(*m_ssBlock) << m_savePaperSpaceHandle << endl;
	(*m_ssBlock) << "100" << endl;
	(*m_ssBlock) << "AcDbEntity" << endl;
	(*m_ssBlock) << " 67" << endl; // paper_space flag
	(*m_ssBlock) << " 1" << endl;
	}
	(*m_ssBlock) << " 8" << endl;
	(*m_ssBlock) << "0" << endl;
	if (m_version > 12) {
	(*m_ssBlock) << "100" << endl;
	(*m_ssBlock) << "AcDbBlockEnd" << endl;
	}
	}

	std::string CDxfWrite::getPlateFile(std::string fileSpec)
	{
	std::stringstream outString;
	Base::FileInfo fi(fileSpec);
	if (!fi.isReadable()) {
	Base::Console().message("dxf unable to open %s!\n", fileSpec.c_str());
	}
	else {
	string line;
	ifstream inFile(fi.filePath());

	while (!inFile.eof()) {
	getline(inFile, line);
	if (!inFile.eof()) {
	outString << line << '\n';
	}
	}
	}
	return outString.str();
	}

	std::string CDxfWrite::getHandle()
	{
	m_handle++;
	std::stringstream ss;
	ss << std::uppercase << std::hex << std::setfill('0') << std::setw(2);
	ss << m_handle;
	return ss.str();
	}

	std::string CDxfWrite::getEntityHandle()
	{
	return getHandle();
	// m_entityHandle++;
	// std::stringstream ss;
	// ss << std::uppercase << std::hex << std::setfill('0') << std::setw(2);
	// ss << m_entityHandle;
	// return ss.str();
	}

	std::string CDxfWrite::getLayerHandle()
	{
	return getHandle();
	// m_layerHandle++;
	// std::stringstream ss;
	// ss << std::uppercase << std::hex << std::setfill('0') << std::setw(2);
	// ss << m_layerHandle;
	// return ss.str();
	}

	std::string CDxfWrite::getBlockHandle()
	{
	return getHandle();
	// m_blockHandle++;
	// std::stringstream ss;
	// ss << std::uppercase << std::hex << std::setfill('0') << std::setw(2);
	// ss << m_blockHandle;
	// return ss.str();
	}

	std::string CDxfWrite::getBlkRecordHandle()
	{
	return getHandle();
	// m_blkRecordHandle++;
	// std::stringstream ss;
	// ss << std::uppercase << std::hex << std::setfill('0') << std::setw(2);
	// ss << m_blkRecordHandle;
	// return ss.str();
	}

	void CDxfWrite::addBlockName(const std::string& name, const std::string& blkRecordHandle)
	{
	m_blockList.push_back(name);
	m_blkRecordList.push_back(blkRecordHandle);
	}

	void CDxfWrite::setLayerName(std::string name)
	{
	m_layerName = name;
	m_layerList.push_back(name);
	}

	void CDxfWrite::writeLine(const double* start, const double* end)
	{
	putLine(toVector3d(start), toVector3d(end), m_ssEntity, getEntityHandle(), m_saveModelSpaceHandle);
	}

	void CDxfWrite::putLine(
	const Base::Vector3d& start,
	const Base::Vector3d& end,
	std::ostringstream* outStream,
	const std::string& handle,
	const std::string& ownerHandle
	)
	{
	(*outStream) << " 0" << endl;
	(*outStream) << "LINE" << endl;
	(*outStream) << " 5" << endl;
	(*outStream) << handle << endl;
	if (m_version > 12) {
	(*outStream) << "330" << endl;
	(*outStream) << ownerHandle << endl;
	(*outStream) << "100" << endl;
	(*outStream) << "AcDbEntity" << endl;
	}
	(*outStream) << " 8" << endl; // Group code for layer name
	(*outStream) << getLayerName() << endl; // Layer number
	if (m_version > 12) {
	(*outStream) << "100" << endl;
	(*outStream) << "AcDbLine" << endl;
	}
	(*outStream) << " 10" << endl; // Start point of line
	(*outStream) << start.x << endl; // X in WCS coordinates
	(*outStream) << " 20" << endl;
	(*outStream) << start.y << endl; // Y in WCS coordinates
	(*outStream) << " 30" << endl;
	(*outStream) << start.z << endl; // Z in WCS coordinates
	(*outStream) << " 11" << endl; // End point of line
	(*outStream) << end.x << endl; // X in WCS coordinates
	(*outStream) << " 21" << endl;
	(*outStream) << end.y << endl; // Y in WCS coordinates
	(*outStream) << " 31" << endl;
	(*outStream) << end.z << endl; // Z in WCS coordinates
	}


	//***************************
	// writeLWPolyLine (Note: LWPolyline might not be supported in R12
	// added by Wandererfan 2018 (wandererfan@gmail.com) for FreeCAD project
	void CDxfWrite::writeLWPolyLine(const LWPolyDataOut& pd)
	{
	(*m_ssEntity) << " 0" << endl;
	(*m_ssEntity) << "LWPOLYLINE" << endl;
	(*m_ssEntity) << " 5" << endl;
	(*m_ssEntity) << getEntityHandle() << endl;
	if (m_version > 12) {
	(*m_ssEntity) << "330" << endl;
	(*m_ssEntity) << m_saveModelSpaceHandle << endl;
	(*m_ssEntity) << "100" << endl;
	(*m_ssEntity) << "AcDbEntity" << endl;
	}
	if (m_version > 12) {
	(*m_ssEntity) << "100" << endl; // 100 groups are not part of R12
	(*m_ssEntity) << "AcDbPolyline" << endl;
	}
	(*m_ssEntity) << " 8" << endl; // Group code for layer name
	(*m_ssEntity) << getLayerName() << endl; // Layer name
	(*m_ssEntity) << " 90" << endl;
	(*m_ssEntity) << pd.nVert << endl; // number of vertices
	(*m_ssEntity) << " 70" << endl;
	(*m_ssEntity) << pd.Flag << endl;
	(*m_ssEntity) << " 43" << endl;
	(*m_ssEntity) << "0" << endl; // Constant width opt
	// (*m_ssEntity) << pd.Width << endl; //Constant width opt
	// (*m_ssEntity) << " 38" << endl;
	// (*m_ssEntity) << pd.Elev << endl; // Elevation
	// (*m_ssEntity) << " 39" << endl;
	// (*m_ssEntity) << pd.Thick << endl; // Thickness
	for (auto& p : pd.Verts) {
	(*m_ssEntity) << " 10" << endl; // Vertices
	(*m_ssEntity) << p.x << endl;
	(*m_ssEntity) << " 20" << endl;
	(*m_ssEntity) << p.y << endl;
	}
	for (auto& s : pd.StartWidth) {
	(*m_ssEntity) << " 40" << endl;
	(*m_ssEntity) << s << endl; // Start Width
	}
	for (auto& e : pd.EndWidth) {
	(*m_ssEntity) << " 41" << endl;
	(*m_ssEntity) << e << endl; // End Width
	}
	for (auto& b : pd.Bulge) { // Bulge
	(*m_ssEntity) << " 42" << endl;
	(*m_ssEntity) << b << endl;
	}
	// (*m_ssEntity) << "210" << endl; //Extrusion dir
	// (*m_ssEntity) << pd.Extr.x << endl;
	// (*m_ssEntity) << "220" << endl;
	// (*m_ssEntity) << pd.Extr.y << endl;
	// (*m_ssEntity) << "230" << endl;
	// (*m_ssEntity) << pd.Extr.z << endl;
	}

	//***************************
	// writePolyline
	// added by Wandererfan 2018 (wandererfan@gmail.com) for FreeCAD project
	void CDxfWrite::writePolyline(const LWPolyDataOut& pd)
	{
	(*m_ssEntity) << " 0" << endl;
	(*m_ssEntity) << "POLYLINE" << endl;
	(*m_ssEntity) << " 5" << endl;
	(*m_ssEntity) << getEntityHandle() << endl;
	if (m_version > 12) {
	(*m_ssEntity) << "330" << endl;
	(*m_ssEntity) << m_saveModelSpaceHandle << endl;
	(*m_ssEntity) << "100" << endl;
	(*m_ssEntity) << "AcDbEntity" << endl;
	}
	(*m_ssEntity) << " 8" << endl;
	(*m_ssEntity) << getLayerName() << endl; // Layer name
	if (m_version > 12) {
	(*m_ssEntity) << "100" << endl; // 100 groups are not part of R12
	(*m_ssEntity) << "AcDbPolyline" << endl;
	}
	(*m_ssEntity) << " 66" << endl;
	(*m_ssEntity) << " 1" << endl; // vertices follow
	(*m_ssEntity) << " 10" << endl;
	(*m_ssEntity) << "0.0" << endl;
	(*m_ssEntity) << " 20" << endl;
	(*m_ssEntity) << "0.0" << endl;
	(*m_ssEntity) << " 30" << endl;
	(*m_ssEntity) << "0.0" << endl;
	(*m_ssEntity) << " 70" << endl;
	(*m_ssEntity) << "0" << endl;
	for (auto& p : pd.Verts) {
	(*m_ssEntity) << " 0" << endl;
	(*m_ssEntity) << "VERTEX" << endl;
	(*m_ssEntity) << " 5" << endl;
	(*m_ssEntity) << getEntityHandle() << endl;
	(*m_ssEntity) << " 8" << endl;
	(*m_ssEntity) << getLayerName() << endl;
	(*m_ssEntity) << " 10" << endl;
	(*m_ssEntity) << p.x << endl;
	(*m_ssEntity) << " 20" << endl;
	(*m_ssEntity) << p.y << endl;
	(*m_ssEntity) << " 30" << endl;
	(*m_ssEntity) << p.z << endl;
	}
	(*m_ssEntity) << " 0" << endl;
	(*m_ssEntity) << "SEQEND" << endl;
	(*m_ssEntity) << " 5" << endl;
	(*m_ssEntity) << getEntityHandle() << endl;
	(*m_ssEntity) << " 8" << endl;
	(*m_ssEntity) << getLayerName() << endl;
	}

	void CDxfWrite::writePoint(const double* point)
	{
	(*m_ssEntity) << " 0" << endl;
	(*m_ssEntity) << "POINT" << endl;
	(*m_ssEntity) << " 5" << endl;
	(*m_ssEntity) << getEntityHandle() << endl;
	if (m_version > 12) {
	(*m_ssEntity) << "330" << endl;
	(*m_ssEntity) << m_saveModelSpaceHandle << endl;
	(*m_ssEntity) << "100" << endl;
	(*m_ssEntity) << "AcDbEntity" << endl;
	}
	(*m_ssEntity) << " 8" << endl; // Group code for layer name
	(*m_ssEntity) << getLayerName() << endl; // Layer name
	if (m_version > 12) {
	(*m_ssEntity) << "100" << endl;
	(*m_ssEntity) << "AcDbPoint" << endl;
	}
	(*m_ssEntity) << " 10" << endl;
	(*m_ssEntity) << point[0] << endl; // X in WCS coordinates
	(*m_ssEntity) << " 20" << endl;
	(*m_ssEntity) << point[1] << endl; // Y in WCS coordinates
	(*m_ssEntity) << " 30" << endl;
	(*m_ssEntity) << point[2] << endl; // Z in WCS coordinates
	}

	//! arc from 3 points - start, end, center. dir true if arc is AntiClockwise. unspecified assumption
	//! is that points are on XY plane in coord system OXYZ.
	void CDxfWrite::writeArc(const double* start, const double* end, const double* center, bool dir)

	{
	double ax = start[0] - center[0];
	double ay = start[1] - center[1];
	double bx = end[0] - center[0];
	double by = end[1] - center[1];

	double start_angle = Base::toDegrees(atan2(ay, ax));
	double end_angle = Base::toDegrees(atan2(by, bx));
	double radius = sqrt(ax * ax + ay * ay);
	if (!dir) {
	double temp = start_angle;
	start_angle = end_angle;
	end_angle = temp;
	}
	(*m_ssEntity) << " 0" << endl;
	(*m_ssEntity) << "ARC" << endl;
	(*m_ssEntity) << " 5" << endl;
	(*m_ssEntity) << getEntityHandle() << endl;
	if (m_version > 12) {
	(*m_ssEntity) << "330" << endl;
	(*m_ssEntity) << m_saveModelSpaceHandle << endl;
	(*m_ssEntity) << "100" << endl;
	(*m_ssEntity) << "AcDbEntity" << endl;
	}
	(*m_ssEntity) << " 8" << endl; // Group code for layer name
	(*m_ssEntity) << getLayerName() << endl; // Layer number
	// (*m_ssEntity) << " 62" << endl;
	// (*m_ssEntity) << " 0" << endl;
	if (m_version > 12) {
	(*m_ssEntity) << "100" << endl;
	(*m_ssEntity) << "AcDbCircle" << endl;
	}
	(*m_ssEntity) << " 10" << endl; // Centre X
	(*m_ssEntity) << center[0] << endl; // X in WCS coordinates
	(*m_ssEntity) << " 20" << endl;
	(*m_ssEntity) << center[1] << endl; // Y in WCS coordinates
	(*m_ssEntity) << " 30" << endl;
	(*m_ssEntity) << center[2] << endl; // Z in WCS coordinates
	(*m_ssEntity) << " 40" << endl; //
	(*m_ssEntity) << radius << endl; // Radius

	if (m_version > 12) {
	(*m_ssEntity) << "100" << endl;
	(*m_ssEntity) << "AcDbArc" << endl;
	}
	(*m_ssEntity) << " 50" << endl;
	(*m_ssEntity) << start_angle << endl; // Start angle
	(*m_ssEntity) << " 51" << endl;
	(*m_ssEntity) << end_angle << endl; // End angle
	}

	void CDxfWrite::writeCircle(const double* center, double radius)
	{
	(*m_ssEntity) << " 0" << endl;
	(*m_ssEntity) << "CIRCLE" << endl;
	(*m_ssEntity) << " 5" << endl;
	(*m_ssEntity) << getEntityHandle() << endl;
	if (m_version > 12) {
	(*m_ssEntity) << "330" << endl;
	(*m_ssEntity) << m_saveModelSpaceHandle << endl;
	(*m_ssEntity) << "100" << endl;
	(*m_ssEntity) << "AcDbEntity" << endl;
	}
	(*m_ssEntity) << " 8" << endl; // Group code for layer name
	(*m_ssEntity) << getLayerName() << endl; // Layer number
	if (m_version > 12) {
	(*m_ssEntity) << "100" << endl;
	(*m_ssEntity) << "AcDbCircle" << endl;
	}
	(*m_ssEntity) << " 10" << endl; // Centre X
	(*m_ssEntity) << center[0] << endl; // X in WCS coordinates
	(*m_ssEntity) << " 20" << endl;
	(*m_ssEntity) << center[1] << endl; // Y in WCS coordinates
	(*m_ssEntity) << " 30" << endl;
	(*m_ssEntity) << center[2] << endl; // Z in WCS coordinates
	(*m_ssEntity) << " 40" << endl; //
	(*m_ssEntity) << radius << endl; // Radius
	}

	void CDxfWrite::writeEllipse(
	const double* center,
	double major_radius,
	double minor_radius,
	double rotation,
	double start_angle,
	double end_angle,
	bool endIsCW
	)
	{
	Base::Vector3d m(major_radius * sin(rotation), major_radius * cos(rotation), 0);
	double ratio = minor_radius / major_radius;

	if (!endIsCW) { // end is NOT CW from start
	double temp = start_angle;
	start_angle = end_angle;
	end_angle = temp;
	}
	(*m_ssEntity) << " 0" << endl;
	(*m_ssEntity) << "ELLIPSE" << endl;
	(*m_ssEntity) << " 5" << endl;
	(*m_ssEntity) << getEntityHandle() << endl;
	if (m_version > 12) {
	(*m_ssEntity) << "330" << endl;
	(*m_ssEntity) << m_saveModelSpaceHandle << endl;
	(*m_ssEntity) << "100" << endl;
	(*m_ssEntity) << "AcDbEntity" << endl;
	}
	(*m_ssEntity) << " 8" << endl; // Group code for layer name
	(*m_ssEntity) << getLayerName() << endl; // Layer number
	if (m_version > 12) {
	(*m_ssEntity) << "100" << endl;
	(*m_ssEntity) << "AcDbEllipse" << endl;
	}
	(*m_ssEntity) << " 10" << endl; // Centre X
	(*m_ssEntity) << center[0] << endl; // X in WCS coordinates
	(*m_ssEntity) << " 20" << endl;
	(*m_ssEntity) << center[1] << endl; // Y in WCS coordinates
	(*m_ssEntity) << " 30" << endl;
	(*m_ssEntity) << center[2] << endl; // Z in WCS coordinates
	(*m_ssEntity) << " 11" << endl; //
	(*m_ssEntity) << m.x << endl; // Major X
	(*m_ssEntity) << " 21" << endl;
	(*m_ssEntity) << m.y << endl; // Major Y
	(*m_ssEntity) << " 31" << endl;
	(*m_ssEntity) << m.z << endl; // Major Z
	(*m_ssEntity) << " 40" << endl; //
	(*m_ssEntity) << ratio << endl; // Ratio
	// (*m_ssEntity) << "210" << endl; //extrusion dir??
	// (*m_ssEntity) << "0" << endl;
	// (*m_ssEntity) << "220" << endl;
	// (*m_ssEntity) << "0" << endl;
	// (*m_ssEntity) << "230" << endl;
	// (*m_ssEntity) << "1" << endl;
	(*m_ssEntity) << " 41" << endl;
	(*m_ssEntity) << start_angle << endl; // Start angle (radians [0..2pi])
	(*m_ssEntity) << " 42" << endl;
	(*m_ssEntity) << end_angle << endl; // End angle
	}

	//***************************
	// writeSpline
	// added by Wandererfan 2018 (wandererfan@gmail.com) for FreeCAD project
	void CDxfWrite::writeSpline(const SplineDataOut& sd)
	{
	(*m_ssEntity) << " 0" << endl;
	(*m_ssEntity) << "SPLINE" << endl;
	(*m_ssEntity) << " 5" << endl;
	(*m_ssEntity) << getEntityHandle() << endl;
	if (m_version > 12) {
	(*m_ssEntity) << "330" << endl;
	(*m_ssEntity) << m_saveModelSpaceHandle << endl;
	(*m_ssEntity) << "100" << endl;
	(*m_ssEntity) << "AcDbEntity" << endl;
	}
	(*m_ssEntity) << " 8" << endl; // Group code for layer name
	(*m_ssEntity) << getLayerName() << endl; // Layer name
	if (m_version > 12) {
	(*m_ssEntity) << "100" << endl;
	(*m_ssEntity) << "AcDbSpline" << endl;
	}
	(*m_ssEntity) << "210" << endl;
	(*m_ssEntity) << "0" << endl;
	(*m_ssEntity) << "220" << endl;
	(*m_ssEntity) << "0" << endl;
	(*m_ssEntity) << "230" << endl;
	(*m_ssEntity) << "1" << endl;

	(*m_ssEntity) << " 70" << endl;
	(*m_ssEntity) << sd.flag << endl; // flags
	(*m_ssEntity) << " 71" << endl;
	(*m_ssEntity) << sd.degree << endl;
	(*m_ssEntity) << " 72" << endl;
	(*m_ssEntity) << sd.knots << endl;
	(*m_ssEntity) << " 73" << endl;
	(*m_ssEntity) << sd.control_points << endl;
	(*m_ssEntity) << " 74" << endl;
	(*m_ssEntity) << 0 << endl;

	// (*m_ssEntity) << " 12" << endl;
	// (*m_ssEntity) << sd.starttan.x << endl;
	// (*m_ssEntity) << " 22" << endl;
	// (*m_ssEntity) << sd.starttan.y << endl;
	// (*m_ssEntity) << " 32" << endl;
	// (*m_ssEntity) << sd.starttan.z << endl;
	// (*m_ssEntity) << " 13" << endl;
	// (*m_ssEntity) << sd.endtan.x << endl;
	// (*m_ssEntity) << " 23" << endl;
	// (*m_ssEntity) << sd.endtan.y << endl;
	// (*m_ssEntity) << " 33" << endl;
	// (*m_ssEntity) << sd.endtan.z << endl;

	for (auto& k : sd.knot) {
	(*m_ssEntity) << " 40" << endl;
	(*m_ssEntity) << k << endl;
	}

	for (auto& w : sd.weight) {
	(*m_ssEntity) << " 41" << endl;
	(*m_ssEntity) << w << endl;
	}

	for (auto& center : sd.control) {
	(*m_ssEntity) << " 10" << endl;
	(*m_ssEntity) << center.x << endl; // X in WCS coordinates
	(*m_ssEntity) << " 20" << endl;
	(*m_ssEntity) << center.y << endl; // Y in WCS coordinates
	(*m_ssEntity) << " 30" << endl;
	(*m_ssEntity) << center.z << endl; // Z in WCS coordinates
	}
	for (auto& f : sd.fit) {
	(*m_ssEntity) << " 11" << endl;
	(*m_ssEntity) << f.x << endl; // X in WCS coordinates
	(*m_ssEntity) << " 21" << endl;
	(*m_ssEntity) << f.y << endl; // Y in WCS coordinates
	(*m_ssEntity) << " 31" << endl;
	(*m_ssEntity) << f.z << endl; // Z in WCS coordinates
	}
	}

	//***************************
	// writeVertex
	// added by Wandererfan 2018 (wandererfan@gmail.com) for FreeCAD project
	void CDxfWrite::writeVertex(double x, double y, double z)
	{
	(*m_ssEntity) << " 0" << endl;
	(*m_ssEntity) << "VERTEX" << endl;
	(*m_ssEntity) << " 5" << endl;
	(*m_ssEntity) << getEntityHandle() << endl;
	if (m_version > 12) {
	(*m_ssEntity) << "330" << endl;
	(*m_ssEntity) << m_saveModelSpaceHandle << endl;
	(*m_ssEntity) << "100" << endl;
	(*m_ssEntity) << "AcDbEntity" << endl;
	}
	(*m_ssEntity) << " 8" << endl;
	(*m_ssEntity) << getLayerName() << endl;
	if (m_version > 12) {
	(*m_ssEntity) << "100" << endl;
	(*m_ssEntity) << "AcDbVertex" << endl;
	}
	(*m_ssEntity) << " 10" << endl;
	(*m_ssEntity) << x << endl;
	(*m_ssEntity) << " 20" << endl;
	(*m_ssEntity) << y << endl;
	(*m_ssEntity) << " 30" << endl;
	(*m_ssEntity) << z << endl;
	(*m_ssEntity) << " 70" << endl;
	(*m_ssEntity) << 0 << endl;
	}

	void CDxfWrite::writeText(
	const char* text,
	const double* location1,
	const double* location2,
	const double height,
	const int horizJust
	)
	{
	putText(
	text,
	toVector3d(location1),
	toVector3d(location2),
	height,
	horizJust,
	m_ssEntity,
	getEntityHandle(),
	m_saveModelSpaceHandle
	);
	}

	//***************************
	// putText
	// added by Wandererfan 2018 (wandererfan@gmail.com) for FreeCAD project
	void CDxfWrite::putText(
	const char* text,
	const Base::Vector3d& location1,
	const Base::Vector3d& location2,
	const double height,
	const int horizJust,
	std::ostringstream* outStream,
	const std::string& handle,
	const std::string& ownerHandle
	)
	{
	(void)location2;

	(*outStream) << " 0" << endl;
	(*outStream) << "TEXT" << endl;
	(*outStream) << " 5" << endl;
	(*outStream) << handle << endl;
	if (m_version > 12) {
	(*outStream) << "330" << endl;
	(*outStream) << ownerHandle << endl;
	(*outStream) << "100" << endl;
	(*outStream) << "AcDbEntity" << endl;
	}
	(*outStream) << " 8" << endl;
	(*outStream) << getLayerName() << endl;
	if (m_version > 12) {
	(*outStream) << "100" << endl;
	(*outStream) << "AcDbText" << endl;
	}
	// (*outStream) << " 39" << endl;
	// (*outStream) << 0 << endl; //thickness
	(*outStream) << " 10" << endl; // first alignment point
	(*outStream) << location1.x << endl;
	(*outStream) << " 20" << endl;
	(*outStream) << location1.y << endl;
	(*outStream) << " 30" << endl;
	(*outStream) << location1.z << endl;
	(*outStream) << " 40" << endl;
	(*outStream) << height << endl;
	(*outStream) << " 1" << endl;
	(*outStream) << text << endl;
	// (*outStream) << " 50" << endl;
	// (*outStream) << 0 << endl; //rotation
	// (*outStream) << " 41" << endl;
	// (*outStream) << 1 << endl;
	// (*outStream) << " 51" << endl;
	// (*outStream) << 0 << endl;

	(*outStream) << " 7" << endl;
	(*outStream) << "STANDARD" << endl; // style
	// (*outStream) << " 71" << endl; //default
	// (*outStream) << "0" << endl;
	(*outStream) << " 72" << endl;
	(*outStream) << horizJust << endl;
	//// (*outStream) << " 73" << endl;
	//// (*outStream) << "0" << endl;
	(*outStream) << " 11" << endl; // second alignment point
	(*outStream) << location2.x << endl;
	(*outStream) << " 21" << endl;
	(*outStream) << location2.y << endl;
	(*outStream) << " 31" << endl;
	(*outStream) << location2.z << endl;
	// (*outStream) << "210" << endl;
	// (*outStream) << "0" << endl;
	// (*outStream) << "220" << endl;
	// (*outStream) << "0" << endl;
	// (*outStream) << "230" << endl;
	// (*outStream) << "1" << endl;
	if (m_version > 12) {
	(*outStream) << "100" << endl;
	(*outStream) << "AcDbText" << endl;
	}
	}

	void CDxfWrite::putArrow(
	Base::Vector3d& arrowPos,
	Base::Vector3d& barb1Pos,
	Base::Vector3d& barb2Pos,
	std::ostringstream* outStream,
	const std::string& handle,
	const std::string& ownerHandle
	)
	{
	(*outStream) << " 0" << endl;
	(*outStream) << "SOLID" << endl;
	(*outStream) << " 5" << endl;
	(*outStream) << handle << endl;
	if (m_version > 12) {
	(*outStream) << "330" << endl;
	(*outStream) << ownerHandle << endl;
	(*outStream) << "100" << endl;
	(*outStream) << "AcDbEntity" << endl;
	}
	(*outStream) << " 8" << endl;
	(*outStream) << "0" << endl;
	(*outStream) << " 62" << endl;
	(*outStream) << " 0" << endl;
	if (m_version > 12) {
	(*outStream) << "100" << endl;
	(*outStream) << "AcDbTrace" << endl;
	}
	(*outStream) << " 10" << endl;
	(*outStream) << barb1Pos.x << endl;
	(*outStream) << " 20" << endl;
	(*outStream) << barb1Pos.y << endl;
	(*outStream) << " 30" << endl;
	(*outStream) << barb1Pos.z << endl;
	(*outStream) << " 11" << endl;
	(*outStream) << barb2Pos.x << endl;
	(*outStream) << " 21" << endl;
	(*outStream) << barb2Pos.y << endl;
	(*outStream) << " 31" << endl;
	(*outStream) << barb2Pos.z << endl;
	(*outStream) << " 12" << endl;
	(*outStream) << arrowPos.x << endl;
	(*outStream) << " 22" << endl;
	(*outStream) << arrowPos.y << endl;
	(*outStream) << " 32" << endl;
	(*outStream) << arrowPos.z << endl;
	(*outStream) << " 13" << endl;
	(*outStream) << arrowPos.x << endl;
	(*outStream) << " 23" << endl;
	(*outStream) << arrowPos.y << endl;
	(*outStream) << " 33" << endl;
	(*outStream) << arrowPos.z << endl;
	}

	//***************************
	// writeLinearDim
	// added by Wandererfan 2018 (wandererfan@gmail.com) for FreeCAD project
	#define ALIGNED 0
	#define HORIZONTAL 1
	#define VERTICAL 2
	void CDxfWrite::writeLinearDim(
	const double* textMidPoint,
	const double* lineDefPoint,
	const double* extLine1,
	const double* extLine2,
	const char* dimText,
	int type
	)
	{
	(*m_ssEntity) << " 0" << endl;
	(*m_ssEntity) << "DIMENSION" << endl;
	(*m_ssEntity) << " 5" << endl;
	(*m_ssEntity) << getEntityHandle() << endl;
	if (m_version > 12) {
	(*m_ssEntity) << "330" << endl;
	(*m_ssEntity) << m_saveModelSpaceHandle << endl;
	(*m_ssEntity) << "100" << endl;
	(*m_ssEntity) << "AcDbEntity" << endl;
	}
	(*m_ssEntity) << " 8" << endl;
	(*m_ssEntity) << getLayerName() << endl;
	if (m_version > 12) {
	(*m_ssEntity) << "100" << endl;
	(*m_ssEntity) << "AcDbDimension" << endl;
	}
	(*m_ssEntity) << " 2" << endl;
	(m_ssEntity) << "" << getLayerName() << endl; // blockName
	(*m_ssEntity) << " 10" << endl; // dimension line definition point
	(*m_ssEntity) << lineDefPoint[0] << endl;
	(*m_ssEntity) << " 20" << endl;
	(*m_ssEntity) << lineDefPoint[1] << endl;
	(*m_ssEntity) << " 30" << endl;
	(*m_ssEntity) << lineDefPoint[2] << endl;
	(*m_ssEntity) << " 11" << endl; // text mid point
	(*m_ssEntity) << textMidPoint[0] << endl;
	(*m_ssEntity) << " 21" << endl;
	(*m_ssEntity) << textMidPoint[1] << endl;
	(*m_ssEntity) << " 31" << endl;
	(*m_ssEntity) << textMidPoint[2] << endl;
	if (type == ALIGNED) {
	(*m_ssEntity) << " 70" << endl;
	(*m_ssEntity) << 1 << endl; // dimType1 = Aligned
	}
	if ((type == HORIZONTAL) \|\| (type == VERTICAL)) {
	(*m_ssEntity) << " 70" << endl;
	(*m_ssEntity) << 32 << endl; // dimType0 = Aligned + 32 (bit for unique block)?
	}
	// (*m_ssEntity) << " 71" << endl; // not R12
	// (*m_ssEntity) << 1 << endl; // attachPoint ??1 = topleft
	(*m_ssEntity) << " 1" << endl;
	(*m_ssEntity) << dimText << endl;
	(*m_ssEntity) << " 3" << endl;
	(*m_ssEntity) << "STANDARD" << endl; // style
	// linear dims
	if (m_version > 12) {
	(*m_ssEntity) << "100" << endl;
	(*m_ssEntity) << "AcDbAlignedDimension" << endl;
	}
	(*m_ssEntity) << " 13" << endl;
	(*m_ssEntity) << extLine1[0] << endl;
	(*m_ssEntity) << " 23" << endl;
	(*m_ssEntity) << extLine1[1] << endl;
	(*m_ssEntity) << " 33" << endl;
	(*m_ssEntity) << extLine1[2] << endl;
	(*m_ssEntity) << " 14" << endl;
	(*m_ssEntity) << extLine2[0] << endl;
	(*m_ssEntity) << " 24" << endl;
	(*m_ssEntity) << extLine2[1] << endl;
	(*m_ssEntity) << " 34" << endl;
	(*m_ssEntity) << extLine2[2] << endl;
	if (m_version > 12) {
	if (type == VERTICAL) {
	(*m_ssEntity) << " 50" << endl;
	(*m_ssEntity) << "90" << endl;
	}
	if ((type == HORIZONTAL) \|\| (type == VERTICAL)) {
	(*m_ssEntity) << "100" << endl;
	(*m_ssEntity) << "AcDbRotatedDimension" << endl;
	}
	}

	writeDimBlockPreamble();
	writeLinearDimBlock(textMidPoint, lineDefPoint, extLine1, extLine2, dimText, type);
	writeBlockTrailer();
	}

	//***************************
	// writeAngularDim
	// added by Wandererfan 2018 (wandererfan@gmail.com) for FreeCAD project
	void CDxfWrite::writeAngularDim(
	const double* textMidPoint,
	const double* lineDefPoint,
	const double* startExt1,
	const double* endExt1,
	const double* startExt2,
	const double* endExt2,
	const char* dimText
	)
	{
	(*m_ssEntity) << " 0" << endl;
	(*m_ssEntity) << "DIMENSION" << endl;
	(*m_ssEntity) << " 5" << endl;
	(*m_ssEntity) << getEntityHandle() << endl;
	if (m_version > 12) {
	(*m_ssEntity) << "330" << endl;
	(*m_ssEntity) << m_saveModelSpaceHandle << endl;
	(*m_ssEntity) << "100" << endl;
	(*m_ssEntity) << "AcDbEntity" << endl;
	}
	(*m_ssEntity) << " 8" << endl;
	(*m_ssEntity) << getLayerName() << endl;
	if (m_version > 12) {
	(*m_ssEntity) << "100" << endl;
	(*m_ssEntity) << "AcDbDimension" << endl;
	}
	(*m_ssEntity) << " 2" << endl;
	(m_ssEntity) << "" << getLayerName() << endl; // blockName

	(*m_ssEntity) << " 10" << endl;
	(*m_ssEntity) << endExt2[0] << endl;
	(*m_ssEntity) << " 20" << endl;
	(*m_ssEntity) << endExt2[1] << endl;
	(*m_ssEntity) << " 30" << endl;
	(*m_ssEntity) << endExt2[2] << endl;

	(*m_ssEntity) << " 11" << endl;
	(*m_ssEntity) << textMidPoint[0] << endl;
	(*m_ssEntity) << " 21" << endl;
	(*m_ssEntity) << textMidPoint[1] << endl;
	(*m_ssEntity) << " 31" << endl;
	(*m_ssEntity) << textMidPoint[2] << endl;

	(*m_ssEntity) << " 70" << endl;
	(*m_ssEntity) << 2 << endl; // dimType 2 = Angular 5 = Angular 3 point
	// +32 for block?? (not R12)
	// (*m_ssEntity) << " 71" << endl; // not R12? not required?
	// (*m_ssEntity) << 5 << endl; // attachPoint 5 = middle
	(*m_ssEntity) << " 1" << endl;
	(*m_ssEntity) << dimText << endl;
	(*m_ssEntity) << " 3" << endl;
	(*m_ssEntity) << "STANDARD" << endl; // style
	// angular dims
	if (m_version > 12) {
	(*m_ssEntity) << "100" << endl;
	(*m_ssEntity) << "AcDb2LineAngularDimension" << endl;
	}
	(*m_ssEntity) << " 13" << endl;
	(*m_ssEntity) << startExt1[0] << endl;
	(*m_ssEntity) << " 23" << endl;
	(*m_ssEntity) << startExt1[1] << endl;
	(*m_ssEntity) << " 33" << endl;
	(*m_ssEntity) << startExt1[2] << endl;

	(*m_ssEntity) << " 14" << endl;
	(*m_ssEntity) << endExt1[0] << endl;
	(*m_ssEntity) << " 24" << endl;
	(*m_ssEntity) << endExt1[1] << endl;
	(*m_ssEntity) << " 34" << endl;
	(*m_ssEntity) << endExt1[2] << endl;

	(*m_ssEntity) << " 15" << endl;
	(*m_ssEntity) << startExt2[0] << endl;
	(*m_ssEntity) << " 25" << endl;
	(*m_ssEntity) << startExt2[1] << endl;
	(*m_ssEntity) << " 35" << endl;
	(*m_ssEntity) << startExt2[2] << endl;

	(*m_ssEntity) << " 16" << endl;
	(*m_ssEntity) << lineDefPoint[0] << endl;
	(*m_ssEntity) << " 26" << endl;
	(*m_ssEntity) << lineDefPoint[1] << endl;
	(*m_ssEntity) << " 36" << endl;
	(*m_ssEntity) << lineDefPoint[2] << endl;
	writeDimBlockPreamble();
	writeAngularDimBlock(textMidPoint, lineDefPoint, startExt1, endExt1, startExt2, endExt2, dimText);
	writeBlockTrailer();
	}

	//***************************
	// writeRadialDim
	// added by Wandererfan 2018 (wandererfan@gmail.com) for FreeCAD project
	void CDxfWrite::writeRadialDim(
	const double* centerPoint,
	const double* textMidPoint,
	const double* arcPoint,
	const char* dimText
	)
	{
	(*m_ssEntity) << " 0" << endl;
	(*m_ssEntity) << "DIMENSION" << endl;
	(*m_ssEntity) << " 5" << endl;
	(*m_ssEntity) << getEntityHandle() << endl;
	if (m_version > 12) {
	(*m_ssEntity) << "330" << endl;
	(*m_ssEntity) << m_saveModelSpaceHandle << endl;
	(*m_ssEntity) << "100" << endl;
	(*m_ssEntity) << "AcDbEntity" << endl;
	}
	(*m_ssEntity) << " 8" << endl;
	(*m_ssEntity) << getLayerName() << endl;
	if (m_version > 12) {
	(*m_ssEntity) << "100" << endl;
	(*m_ssEntity) << "AcDbDimension" << endl;
	}
	(*m_ssEntity) << " 2" << endl;
	(m_ssEntity) << "" << getLayerName() << endl; // blockName
	(*m_ssEntity) << " 10" << endl; // arc center point
	(*m_ssEntity) << centerPoint[0] << endl;
	(*m_ssEntity) << " 20" << endl;
	(*m_ssEntity) << centerPoint[1] << endl;
	(*m_ssEntity) << " 30" << endl;
	(*m_ssEntity) << centerPoint[2] << endl;
	(*m_ssEntity) << " 11" << endl; // text mid point
	(*m_ssEntity) << textMidPoint[0] << endl;
	(*m_ssEntity) << " 21" << endl;
	(*m_ssEntity) << textMidPoint[1] << endl;
	(*m_ssEntity) << " 31" << endl;
	(*m_ssEntity) << textMidPoint[2] << endl;
	(*m_ssEntity) << " 70" << endl;
	(*m_ssEntity) << 4 << endl; // dimType 4 = Radius
	// (*m_ssEntity) << " 71" << endl; // not R12
	// (*m_ssEntity) << 1 << endl; // attachPoint 5 = middle center
	(*m_ssEntity) << " 1" << endl;
	(*m_ssEntity) << dimText << endl;
	(*m_ssEntity) << " 3" << endl;
	(*m_ssEntity) << "STANDARD" << endl; // style
	// radial dims
	if (m_version > 12) {
	(*m_ssEntity) << "100" << endl;
	(*m_ssEntity) << "AcDbRadialDimension" << endl;
	}
	(*m_ssEntity) << " 15" << endl;
	(*m_ssEntity) << arcPoint[0] << endl;
	(*m_ssEntity) << " 25" << endl;
	(*m_ssEntity) << arcPoint[1] << endl;
	(*m_ssEntity) << " 35" << endl;
	(*m_ssEntity) << arcPoint[2] << endl;
	(*m_ssEntity) << " 40" << endl; // leader length????
	(*m_ssEntity) << 0 << endl;

	writeDimBlockPreamble();
	writeRadialDimBlock(centerPoint, textMidPoint, arcPoint, dimText);
	writeBlockTrailer();
	}

	//***************************
	// writeDiametricDim
	// added by Wandererfan 2018 (wandererfan@gmail.com) for FreeCAD project
	void CDxfWrite::writeDiametricDim(
	const double* textMidPoint,
	const double* arcPoint1,
	const double* arcPoint2,
	const char* dimText
	)
	{
	(*m_ssEntity) << " 0" << endl;
	(*m_ssEntity) << "DIMENSION" << endl;
	(*m_ssEntity) << " 5" << endl;
	(*m_ssEntity) << getEntityHandle() << endl;
	if (m_version > 12) {
	(*m_ssEntity) << "330" << endl;
	(*m_ssEntity) << m_saveModelSpaceHandle << endl;
	(*m_ssEntity) << "100" << endl;
	(*m_ssEntity) << "AcDbEntity" << endl;
	}
	(*m_ssEntity) << " 8" << endl;
	(*m_ssEntity) << getLayerName() << endl;
	if (m_version > 12) {
	(*m_ssEntity) << "100" << endl;
	(*m_ssEntity) << "AcDbDimension" << endl;
	}
	(*m_ssEntity) << " 2" << endl;
	(m_ssEntity) << "" << getLayerName() << endl; // blockName
	(*m_ssEntity) << " 10" << endl;
	(*m_ssEntity) << arcPoint1[0] << endl;
	(*m_ssEntity) << " 20" << endl;
	(*m_ssEntity) << arcPoint1[1] << endl;
	(*m_ssEntity) << " 30" << endl;
	(*m_ssEntity) << arcPoint1[2] << endl;
	(*m_ssEntity) << " 11" << endl; // text mid point
	(*m_ssEntity) << textMidPoint[0] << endl;
	(*m_ssEntity) << " 21" << endl;
	(*m_ssEntity) << textMidPoint[1] << endl;
	(*m_ssEntity) << " 31" << endl;
	(*m_ssEntity) << textMidPoint[2] << endl;
	(*m_ssEntity) << " 70" << endl;
	(*m_ssEntity) << 3 << endl; // dimType 3 = Diameter
	// (*m_ssEntity) << " 71" << endl; // not R12
	// (*m_ssEntity) << 5 << endl; // attachPoint 5 = middle center
	(*m_ssEntity) << " 1" << endl;
	(*m_ssEntity) << dimText << endl;
	(*m_ssEntity) << " 3" << endl;
	(*m_ssEntity) << "STANDARD" << endl; // style
	// diametric dims
	if (m_version > 12) {
	(*m_ssEntity) << "100" << endl;
	(*m_ssEntity) << "AcDbDiametricDimension" << endl;
	}
	(*m_ssEntity) << " 15" << endl;
	(*m_ssEntity) << arcPoint2[0] << endl;
	(*m_ssEntity) << " 25" << endl;
	(*m_ssEntity) << arcPoint2[1] << endl;
	(*m_ssEntity) << " 35" << endl;
	(*m_ssEntity) << arcPoint2[2] << endl;
	(*m_ssEntity) << " 40" << endl; // leader length????
	(*m_ssEntity) << 0 << endl;

	writeDimBlockPreamble();
	writeDiametricDimBlock(textMidPoint, arcPoint1, arcPoint2, dimText);
	writeBlockTrailer();
	}

	//***************************
	// writeDimBlockPreamble
	// added by Wandererfan 2018 (wandererfan@gmail.com) for FreeCAD project
	void CDxfWrite::writeDimBlockPreamble()
	{
	if (m_version > 12) {
	std::string blockName("*");
	blockName += getLayerName();
	m_saveBlkRecordHandle = getBlkRecordHandle();
	addBlockName(blockName, m_saveBlkRecordHandle);
	}

	m_currentBlock = getBlockHandle();
	(*m_ssBlock) << " 0" << endl;
	(*m_ssBlock) << "BLOCK" << endl;
	(*m_ssBlock) << " 5" << endl;
	(*m_ssBlock) << m_currentBlock << endl;
	if (m_version > 12) {
	(*m_ssBlock) << "330" << endl;
	(*m_ssBlock) << m_saveBlkRecordHandle << endl;
	(*m_ssBlock) << "100" << endl;
	(*m_ssBlock) << "AcDbEntity" << endl;
	}
	(*m_ssBlock) << " 8" << endl;
	(*m_ssBlock) << getLayerName() << endl;
	if (m_version > 12) {
	(*m_ssBlock) << "100" << endl;
	(*m_ssBlock) << "AcDbBlockBegin" << endl;
	}
	(*m_ssBlock) << " 2" << endl;
	(m_ssBlock) << "" << getLayerName() << endl; // blockName
	(*m_ssBlock) << " 70" << endl;
	(*m_ssBlock) << " 1" << endl;
	(*m_ssBlock) << " 10" << endl;
	(*m_ssBlock) << 0.0 << endl;
	(*m_ssBlock) << " 20" << endl;
	(*m_ssBlock) << 0.0 << endl;
	(*m_ssBlock) << " 30" << endl;
	(*m_ssBlock) << 0.0 << endl;
	(*m_ssBlock) << " 3" << endl;
	(m_ssBlock) << "" << getLayerName() << endl; // blockName
	(*m_ssBlock) << " 1" << endl;
	(*m_ssBlock) << " " << endl;
	}

	//***************************
	// writeBlockTrailer
	// added by Wandererfan 2018 (wandererfan@gmail.com) for FreeCAD project
	void CDxfWrite::writeBlockTrailer()
	{
	(*m_ssBlock) << " 0" << endl;
	(*m_ssBlock) << "ENDBLK" << endl;
	(*m_ssBlock) << " 5" << endl;
	(*m_ssBlock) << getBlockHandle() << endl;
	if (m_version > 12) {
	(*m_ssBlock) << "330" << endl;
	(*m_ssBlock) << m_saveBlkRecordHandle << endl;
	(*m_ssBlock) << "100" << endl;
	(*m_ssBlock) << "AcDbEntity" << endl;
	}
	// (*m_ssBlock) << " 67" << endl;
	// (*m_ssBlock) << "1" << endl;
	(*m_ssBlock) << " 8" << endl;
	(*m_ssBlock) << getLayerName() << endl;
	if (m_version > 12) {
	(*m_ssBlock) << "100" << endl;
	(*m_ssBlock) << "AcDbBlockEnd" << endl;
	}
	}

	//***************************
	// writeLinearDimBlock
	// added by Wandererfan 2018 (wandererfan@gmail.com) for FreeCAD project
	void CDxfWrite::writeLinearDimBlock(
	const double* textMidPoint,
	const double* lineDefPoint,
	const double* extLine1,
	const double* extLine2,
	const char* dimText,
	int type
	)
	{
	Base::Vector3d e1S(MakeVector3d(extLine1));
	Base::Vector3d e2S(MakeVector3d(extLine2));
	// point on DimLine (somewhere!)
	Base::Vector3d dl(MakeVector3d(lineDefPoint));
	Base::Vector3d perp = dl.DistanceToLineSegment(e2S, e1S);
	Base::Vector3d e1E = e1S - perp;
	Base::Vector3d e2E = e2S - perp;
	Base::Vector3d para = e1E - e2E;
	if (type == ALIGNED) {
	// NOP
	}
	else if (type == HORIZONTAL) {
	double x = extLine1[0];
	double y = lineDefPoint[1];
	e1E = Base::Vector3d(x, y, 0.0);
	x = extLine2[0];
	e2E = Base::Vector3d(x, y, 0.0);
	perp = Base::Vector3d(0, -1, 0); // down
	para = Base::Vector3d(1, 0, 0); // right
	if (lineDefPoint[1] > extLine1[1]) {
	perp = Base::Vector3d(0, 1, 0); // up
	}
	if (extLine1[0] > extLine2[0]) {
	para = Base::Vector3d(-1, 0, 0); // left
	}
	}
	else if (type == VERTICAL) {
	double x = lineDefPoint[0];
	double y = extLine1[1];
	e1E = Base::Vector3d(x, y, 0.0);
	y = extLine2[1];
	e2E = Base::Vector3d(x, y, 0.0);
	perp = Base::Vector3d(1, 0, 0);
	para = Base::Vector3d(0, 1, 0);
	if (lineDefPoint[0] < extLine1[0]) {
	perp = Base::Vector3d(-1, 0, 0);
	}
	if (extLine1[1] > extLine2[1]) {
	para = Base::Vector3d(0, -1, 0);
	}
	}

	double arrowLen = 5.0; // magic number
	double arrowWidth = arrowLen / 6.0 / 2.0; // magic number calc!

	putLine(e2S, e2E, m_ssBlock, getBlockHandle(), m_saveBlkRecordHandle);

	putLine(e1S, e1E, m_ssBlock, getBlockHandle(), m_saveBlkRecordHandle);

	putLine(e1E, e2E, m_ssBlock, getBlockHandle(), m_saveBlkRecordHandle);

	putText(
	dimText,
	toVector3d(textMidPoint),
	toVector3d(lineDefPoint),
	3.5,
	1,
	m_ssBlock,
	getBlockHandle(),
	m_saveBlkRecordHandle
	);

	perp.Normalize();
	para.Normalize();
	Base::Vector3d arrowStart = e1E;
	Base::Vector3d barb1 = arrowStart + perp * arrowWidth - para * arrowLen;
	Base::Vector3d barb2 = arrowStart - perp * arrowWidth - para * arrowLen;
	putArrow(arrowStart, barb1, barb2, m_ssBlock, getBlockHandle(), m_saveBlkRecordHandle);


	arrowStart = e2E;
	barb1 = arrowStart + perp * arrowWidth + para * arrowLen;
	barb2 = arrowStart - perp * arrowWidth + para * arrowLen;
	putArrow(arrowStart, barb1, barb2, m_ssBlock, getBlockHandle(), m_saveBlkRecordHandle);
	}

	//***************************
	// writeAngularDimBlock
	// added by Wandererfan 2018 (wandererfan@gmail.com) for FreeCAD project
	void CDxfWrite::writeAngularDimBlock(
	const double* textMidPoint,
	const double* lineDefPoint,
	const double* startExt1,
	const double* endExt1,
	const double* startExt2,
	const double* endExt2,
	const char* dimText
	)
	{
	Base::Vector3d e1S(MakeVector3d(startExt1)); // apex
	Base::Vector3d e2S(MakeVector3d(startExt2));
	Base::Vector3d e1E(MakeVector3d(endExt1));
	Base::Vector3d e2E(MakeVector3d(endExt2));
	Base::Vector3d e1 = e1E - e1S;
	Base::Vector3d e2 = e2E - e2S;

	double startAngle = atan2(e2.y, e2.x);
	double endAngle = atan2(e1.y, e1.x);
	double span = fabs(endAngle - startAngle);
	double offset = span * 0.10;
	if (startAngle < 0) {
	startAngle += 2 * std::numbers::pi;
	}
	if (endAngle < 0) {
	endAngle += 2 * std::numbers::pi;
	}
	Base::Vector3d startOff(cos(startAngle + offset), sin(startAngle + offset), 0.0);
	Base::Vector3d endOff(cos(endAngle - offset), sin(endAngle - offset), 0.0);
	startAngle = Base::toDegrees(startAngle);
	endAngle = Base::toDegrees(endAngle);

	Base::Vector3d linePt(MakeVector3d(lineDefPoint));
	double radius = (e2S - linePt).Length();

	(*m_ssBlock) << " 0" << endl;
	(*m_ssBlock) << "ARC" << endl; // dimline arc
	(*m_ssBlock) << " 5" << endl;
	(*m_ssBlock) << getBlockHandle() << endl;
	if (m_version > 12) {
	(*m_ssBlock) << "330" << endl;
	(*m_ssBlock) << m_saveBlkRecordHandle << endl;
	(*m_ssBlock) << "100" << endl;
	(*m_ssBlock) << "AcDbEntity" << endl;
	}
	(*m_ssBlock) << " 8" << endl;
	(*m_ssBlock) << "0" << endl;
	// (*m_ssBlock) << " 62" << endl;
	// (*m_ssBlock) << " 0" << endl;
	if (m_version > 12) {
	(*m_ssBlock) << "100" << endl;
	(*m_ssBlock) << "AcDbCircle" << endl;
	}
	(*m_ssBlock) << " 10" << endl;
	(*m_ssBlock) << startExt2[0] << endl; // arc center
	(*m_ssBlock) << " 20" << endl;
	(*m_ssBlock) << startExt2[1] << endl;
	(*m_ssBlock) << " 30" << endl;
	(*m_ssBlock) << startExt2[2] << endl;
	(*m_ssBlock) << " 40" << endl;
	(*m_ssBlock) << radius << endl; // radius
	if (m_version > 12) {
	(*m_ssBlock) << "100" << endl;
	(*m_ssBlock) << "AcDbArc" << endl;
	}
	(*m_ssBlock) << " 50" << endl;
	(*m_ssBlock) << startAngle << endl; // start angle
	(*m_ssBlock) << " 51" << endl;
	(*m_ssBlock) << endAngle << endl; // end angle

	putText(
	dimText,
	toVector3d(textMidPoint),
	toVector3d(textMidPoint),
	3.5,
	1,
	m_ssBlock,
	getBlockHandle(),
	m_saveBlkRecordHandle
	);

	e1.Normalize();
	e2.Normalize();
	Base::Vector3d arrow1Start = e1S + e1 * radius;
	Base::Vector3d arrow2Start = e2S + e2 * radius;

	// wf: idk why the Tan pts have to be reversed. something to do with CW angles in Dxf?
	Base::Vector3d endTan = e1S + (startOff * radius);
	Base::Vector3d startTan = e2S + (endOff * radius);
	Base::Vector3d tanP1 = (arrow1Start - startTan).Normalize();
	Base::Vector3d perp1(-tanP1.y, tanP1.x, tanP1.z);
	Base::Vector3d tanP2 = (arrow2Start - endTan).Normalize();
	Base::Vector3d perp2(-tanP2.y, tanP2.x, tanP2.z);
	double arrowLen = 5.0; // magic number
	double arrowWidth = arrowLen / 6.0 / 2.0; // magic number calc!

	Base::Vector3d barb1 = arrow1Start + perp1 * arrowWidth - tanP1 * arrowLen;
	Base::Vector3d barb2 = arrow1Start - perp1 * arrowWidth - tanP1 * arrowLen;

	putArrow(arrow1Start, barb1, barb2, m_ssBlock, getBlockHandle(), m_saveBlkRecordHandle);

	barb1 = arrow2Start + perp2 * arrowWidth - tanP2 * arrowLen;
	barb2 = arrow2Start - perp2 * arrowWidth - tanP2 * arrowLen;

	putArrow(arrow2Start, barb1, barb2, m_ssBlock, getBlockHandle(), m_saveBlkRecordHandle);
	}

	//***************************
	// writeRadialDimBlock
	// added by Wandererfan 2018 (wandererfan@gmail.com) for FreeCAD project
	void CDxfWrite::writeRadialDimBlock(
	const double* centerPoint,
	const double* textMidPoint,
	const double* arcPoint,
	const char* dimText
	)
	{
	putLine(
	toVector3d(centerPoint),
	toVector3d(arcPoint),
	m_ssBlock,
	getBlockHandle(),
	m_saveBlkRecordHandle
	);

	putText(
	dimText,
	toVector3d(textMidPoint),
	toVector3d(textMidPoint),
	3.5,
	1,
	m_ssBlock,
	getBlockHandle(),
	m_saveBlkRecordHandle
	);

	Base::Vector3d center(MakeVector3d(centerPoint));
	Base::Vector3d a(MakeVector3d(arcPoint));
	Base::Vector3d para = a - center;
	double arrowLen = 5.0; // magic number
	double arrowWidth = arrowLen / 6.0 / 2.0; // magic number calc!
	para.Normalize();
	Base::Vector3d perp(-para.y, para.x, para.z);
	Base::Vector3d arrowStart = a;
	Base::Vector3d barb1 = arrowStart + perp * arrowWidth - para * arrowLen;
	Base::Vector3d barb2 = arrowStart - perp * arrowWidth - para * arrowLen;

	putArrow(arrowStart, barb1, barb2, m_ssBlock, getBlockHandle(), m_saveBlkRecordHandle);
	}

	//***************************
	// writeDiametricDimBlock
	// added by Wandererfan 2018 (wandererfan@gmail.com) for FreeCAD project
	void CDxfWrite::writeDiametricDimBlock(
	const double* textMidPoint,
	const double* arcPoint1,
	const double* arcPoint2,
	const char* dimText
	)
	{
	putLine(toVector3d(arcPoint1), toVector3d(arcPoint2), m_ssBlock, getBlockHandle(), m_saveBlkRecordHandle);

	putText(
	dimText,
	toVector3d(textMidPoint),
	toVector3d(textMidPoint),
	3.5,
	1,
	m_ssBlock,
	getBlockHandle(),
	m_saveBlkRecordHandle
	);

	Base::Vector3d a1(MakeVector3d(arcPoint1));
	Base::Vector3d a2(MakeVector3d(arcPoint2));
	Base::Vector3d para = a2 - a1;
	double arrowLen = 5.0; // magic number
	double arrowWidth = arrowLen / 6.0 / 2.0; // magic number calc!
	para.Normalize();
	Base::Vector3d perp(-para.y, para.x, para.z);
	Base::Vector3d arrowStart = a1;
	Base::Vector3d barb1 = arrowStart + perp * arrowWidth + para * arrowLen;
	Base::Vector3d barb2 = arrowStart - perp * arrowWidth + para * arrowLen;

	putArrow(arrowStart, barb1, barb2, m_ssBlock, getBlockHandle(), m_saveBlkRecordHandle);

	arrowStart = a2;
	barb1 = arrowStart + perp * arrowWidth - para * arrowLen;
	barb2 = arrowStart - perp * arrowWidth - para * arrowLen;
	putArrow(arrowStart, barb1, barb2, m_ssBlock, getBlockHandle(), m_saveBlkRecordHandle);
	}

	//***************************
	// writeBlocksSection
	// added by Wandererfan 2018 (wandererfan@gmail.com) for FreeCAD project
	void CDxfWrite::writeBlocksSection()
	{
	if (m_version < 14) {
	std::stringstream ss;
	ss << "blocks1" << m_version << ".rub";
	std::string fileSpec = m_dataDir + ss.str();
	(*m_ofs) << getPlateFile(fileSpec);
	}

	// write blocks content
	(m_ofs) << (m_ssBlock).str();

	(*m_ofs) << " 0" << endl;
	(*m_ofs) << "ENDSEC" << endl;
	}

	//***************************
	// writeEntitiesSection
	// added by Wandererfan 2018 (wandererfan@gmail.com) for FreeCAD project
	void CDxfWrite::writeEntitiesSection()
	{
	std::stringstream ss;
	ss << "entities" << m_version << ".rub";
	std::string fileSpec = m_dataDir + ss.str();
	(*m_ofs) << getPlateFile(fileSpec);

	// write entities content
	(m_ofs) << (m_ssEntity).str();


	(*m_ofs) << " 0" << endl;
	(*m_ofs) << "ENDSEC" << endl;
	}

	//***************************
	// writeObjectsSection
	// added by Wandererfan 2018 (wandererfan@gmail.com) for FreeCAD project
	void CDxfWrite::writeObjectsSection()
	{
	if (m_version < 14) {
	return;
	}
	std::stringstream ss;
	ss << "objects" << m_version << ".rub";
	std::string fileSpec = m_dataDir + ss.str();
	(*m_ofs) << getPlateFile(fileSpec);
	}

	const DxfUnits DxfUnits::Instance;

	CDxfRead::CDxfRead(const std::string& filepath)
	: m_ifs(new ifstream(filepath))
	{
	if (!(*m_ifs)) {
	m_fail = true;
	ImportError("DXF file didn't load\n");
	return;
	}
	m_ifs->imbue(std::locale("C"));
	}

	CDxfRead::~CDxfRead()
	{
	delete m_ifs;
	// Delete the Layer objects which are referenced by pointer from the Layers table.
	for (auto& pair : Layers) {
	delete pair.second;
	}
	}

	// Static member initializers
	const std::string CDxfRead::LineTypeByLayer("BYLAYER"); // NOLINT(runtime/string)
	const std::string CDxfRead::LineTypeByBlock("BYBLOCK"); // NOLINT(runtime/string)
	const std::string CDxfRead::DefaultLineType("CONTINUOUS"); // NOLINT(runtime/string)

	//
	// Setup for ProcessCommonEntityAttribute
	void CDxfRead::Setup3DVectorAttribute(eDXFGroupCode_t x_record_type, Base::Vector3d& destination)
	{
	SetupScaledDoubleAttribute((eDXFGroupCode_t)(x_record_type + eXOffset), destination.x);
	SetupScaledDoubleAttribute((eDXFGroupCode_t)(x_record_type + eYOffset), destination.y);
	SetupScaledDoubleAttribute((eDXFGroupCode_t)(x_record_type + eZOffset), destination.z);
	}
	void CDxfRead::Setup3DCoordinatesIntoLists(
	eDXFGroupCode_t x_record_type,
	list<double>& x_destination,
	list<double>& y_destination,
	list<double>& z_destination
	)
	{
	SetupScaledDoubleIntoList((eDXFGroupCode_t)(x_record_type + eXOffset), x_destination);
	SetupScaledDoubleIntoList((eDXFGroupCode_t)(x_record_type + eYOffset), y_destination);
	SetupScaledDoubleIntoList((eDXFGroupCode_t)(x_record_type + eZOffset), z_destination);
	}
	void CDxfRead::SetupScaledDoubleAttribute(eDXFGroupCode_t x_record_type, double& destination)
	{
	m_coordinate_attributes.emplace(x_record_type, std::pair(&ProcessScaledDouble, &destination));
	}
	void CDxfRead::SetupScaledDoubleIntoList(eDXFGroupCode_t x_record_type, list<double>& destination)
	{
	m_coordinate_attributes.emplace(
	x_record_type,
	std::pair(&ProcessScaledDoubleIntoList, &destination)
	);
	}
	void CDxfRead::Setup3DDirectionAttribute(eDXFGroupCode_t x_record_type, Base::Vector3d& destination)
	{
	SetupValueAttribute((eDXFGroupCode_t)(x_record_type + eXOffset), destination.x);
	SetupValueAttribute((eDXFGroupCode_t)(x_record_type + eYOffset), destination.y);
	SetupValueAttribute((eDXFGroupCode_t)(x_record_type + eZOffset), destination.z);
	}
	void CDxfRead::SetupStringAttribute(eDXFGroupCode_t x_record_type, std::string& destination)
	{
	m_coordinate_attributes.emplace(x_record_type, std::pair(&ProcessStdString, &destination));
	}
	template<typename T>
	void CDxfRead::SetupValueAttribute(eDXFGroupCode_t record_type, T& destination)
	{
	m_coordinate_attributes.emplace(record_type, std::pair(&ProcessValue<T>, &destination));
	}

	//
	// Static processing helpers for ProcessCommonEntityAttribute
	void CDxfRead::ProcessScaledDouble(CDxfRead* object, void* target)
	{
	std::istringstream ss;
	ss.imbue(std::locale("C"));

	ss.str(object->m_record_data);
	double value = 0;
	ss >> value;
	if (ss.fail()) {
	object->ImportError(
	"Unable to parse value '%s', using zero as its value\n",
	object->m_record_data
	);
	}
	static_cast<double>(target) = object->mm(value);
	}
	void CDxfRead::ProcessScaledDoubleIntoList(CDxfRead* object, void* target)
	{
	std::istringstream ss;
	ss.imbue(std::locale("C"));

	ss.str(object->m_record_data);
	double value = 0;
	ss >> value;
	if (ss.fail()) {
	object->ImportError(
	"Unable to parse value '%s', using zero as its value\n",
	object->m_record_data
	);
	}
	static_cast<std::list<double>*>(target)->push_back(object->mm(value));
	}
	template<typename T>
	bool CDxfRead::ParseValue(CDxfRead* object, void* target)
	{
	std::istringstream ss;
	ss.imbue(std::locale("C"));

	ss.str(object->m_record_data);
	ss >> static_cast<T>(target);
	if (ss.fail()) {
	object->ImportError(
	"Unable to parse value '%s', using zero as its value\n",
	object->m_record_data
	);
	static_cast<T>(target) = 0;
	return false;
	}
	// TODO: Verify nothing it left but whitespace in ss.
	return true;
	}
	void CDxfRead::ProcessStdString(CDxfRead* object, void* target)
	{
	static_cast<std::string>(target) = object->m_record_data;
	}

	void CDxfRead::InitializeAttributes()
	{
	m_coordinate_attributes.clear();
	}
	bool CDxfRead::ProcessAttribute()
	{
	auto found = m_coordinate_attributes.find(m_record_type);
	if (found != m_coordinate_attributes.end()) {
	(*found->second.first)(this, found->second.second);
	return true;
	}
	return false;
	}
	void CDxfRead::ProcessAllAttributes()
	{
	while (get_next_record() && m_record_type != eObjectType) {
	ProcessAttribute();
	}
	repeat_last_record();
	}
	void CDxfRead::ProcessAllEntityAttributes()
	{
	ProcessAllAttributes();
	ResolveEntityAttributes();
	}
	void CDxfRead::ResolveEntityAttributes()
	{
	m_entityAttributes.ResolveBylayerAttributes(*this);
	if (m_entityAttributes.m_paperSpace) {
	m_stats.entityCounts["ENTITIES_IN_PAPERSPACE"]++;
	}
	// TODO: Look at the space and layer (hidden/frozen?) and options and return false if the entity
	// is not needed.
	// TODO: INSERT must not call this because an INSERT on a hidden layer should always be
	// honoured.

	// Calculate the net entity transformation.

	// This is to handle the Object Coordinate System used in many DXF records. Note that versions
	// before R13 used the term ECS (Entity Coordinate System) instead. Here's who uses OCS: Lines
	// and Points use WCS except they can be extruded (have nonzero Thickness (39)) which occurs in
	// the OCS Z direction all 3D objects use WCS entirely Dimensions use a mix of OCS and WCS,
	// Circle, Arc, Dolid, Trace, Text, Attib, Attdef, Shape, Insert, (lw)Polyline/Vertex, hatch,
	// image all use the OCS
	//
	// The transformed Z axis is in EntityNormalVector, but we rescale it in case the DXF contains
	// an unnormalized value
	if (EntityNormalVector.IsNull()) {
	ImportError("Entity has zero-length extrusion direction\n");
	}
	EntityNormalVector.Normalize();
	// Apply the Arbitrary Axis Algorithm to determine the X and Y directions
	// The purpose of this algorithm is to calculate a conventional 3d orientation based only on a Z
	// direction, while avoiding taking the cross product of two vectors that are nearly parallel,
	// which would be subject to a lot of numerical inaccuracy. In this case, "close to" the Z axis
	// means the X and Y components of EntityNormalVector are less than 1/64, a value chosen because
	// it is exactly representable in all binary floating-point systems.
	Base::Vector3d xDirection;
	if (EntityNormalVector.x < ArbitraryAxisAlgorithmThreshold
	&& EntityNormalVector.y < ArbitraryAxisAlgorithmThreshold) {
	// The Z axis is close to the UCS Z axis, the X direction is UCSY × OCSZ
	static const Base::Vector3d UCSYAxis(0, 1, 0);
	xDirection = UCSYAxis % EntityNormalVector;
	}
	else {
	// otherwise, the X direction is UCSZ × OCSZ
	static const Base::Vector3d UCSZAxis(0, 0, 1);
	xDirection = UCSZAxis % EntityNormalVector;
	}
	OCSOrientationTransform.setCol(0, xDirection);
	// In all cases the Y direction is the Zdirection × XDirection which gives a right-hand
	// orthonormal coordinate system
	OCSOrientationTransform.setCol(1, EntityNormalVector % xDirection);
	// and EntityNormalVector is of course the direction of the Z axis in the UCS.
	OCSOrientationTransform.setCol(2, EntityNormalVector);
	}

	//
	// The individual Entity reader functions
	// These return false if they catch an exception and ignore it because of ignore_errors.
	bool CDxfRead::ReadLine()
	{
	Base::Vector3d start;
	Base::Vector3d end;
	Setup3DVectorAttribute(ePrimaryPoint, start);
	Setup3DVectorAttribute(ePoint2, end);
	ProcessAllEntityAttributes();

	OnReadLine(start, end, LineTypeIsHidden());
	return true;
	}

	bool CDxfRead::ReadPoint()
	{
	Base::Vector3d location;
	Setup3DVectorAttribute(ePrimaryPoint, location);
	ProcessAllEntityAttributes();

	OnReadPoint(location);
	return true;
	}

	bool CDxfRead::ReadArc()
	{
	double start_angle_degrees = 0;
	double end_angle_degrees = 0;
	double radius = 0;
	Base::Vector3d centre;
	Base::Vector3d extrusionDirection(0, 0, 1);

	Setup3DVectorAttribute(ePrimaryPoint, centre);
	SetupScaledDoubleAttribute(eFloat1, radius);
	SetupValueAttribute(eAngleDegrees1, start_angle_degrees);
	SetupValueAttribute(eAngleDegrees2, end_angle_degrees);
	Setup3DVectorAttribute(eExtrusionDirection, extrusionDirection);
	ProcessAllEntityAttributes();

	OnReadArc(
	start_angle_degrees,
	end_angle_degrees,
	radius,
	centre,
	extrusionDirection.z,
	LineTypeIsHidden()
	);
	return true;
	}

	bool CDxfRead::ReadSpline()
	{
	struct SplineData sd;
	sd.degree = 0;
	sd.knots = 0;
	sd.flag = 0;
	sd.control_points = 0;
	sd.fit_points = 0;

	Setup3DVectorAttribute(eExtrusionDirection, sd.norm);
	SetupValueAttribute(eInteger1, sd.flag);
	SetupValueAttribute(eInteger2, sd.degree);
	SetupValueAttribute(eInteger3, sd.knots);
	SetupValueAttribute(eInteger4, sd.control_points);
	SetupValueAttribute(eInteger5, sd.fit_points);
	SetupScaledDoubleIntoList(eFloat1, sd.knot);
	SetupScaledDoubleIntoList(eFloat2, sd.weight);
	Setup3DCoordinatesIntoLists(ePrimaryPoint, sd.controlx, sd.controly, sd.controlz);
	Setup3DCoordinatesIntoLists(ePoint2, sd.fitx, sd.fity, sd.fitz);
	Setup3DCoordinatesIntoLists(ePoint3, sd.starttanx, sd.starttany, sd.starttanz);
	Setup3DCoordinatesIntoLists(ePoint4, sd.endtanx, sd.endtany, sd.endtanz);
	ProcessAllEntityAttributes();

	OnReadSpline(sd);
	return true;
	}

	bool CDxfRead::ReadCircle()
	{
	double radius = 0.0;
	Base::Vector3d centre;

	Setup3DVectorAttribute(ePrimaryPoint, centre);
	SetupScaledDoubleAttribute(eFloat1, radius);
	ProcessAllEntityAttributes();

	OnReadCircle(centre, radius, LineTypeIsHidden());
	return true;
	}

	bool CDxfRead::ReadText()
	{
	Base::Vector3d insertionPoint;
	// NOLINTBEGIN(cppcoreguidelines-avoid-magic-numbers, readability-magic-numbers)
	double height = 0.03082;
	double rotation = 0;
	std::string textPrefix;

	Setup3DVectorAttribute(ePrimaryPoint, insertionPoint);
	SetupScaledDoubleAttribute(eFloat1, height);
	SetupValueAttribute(eAngleDegrees1, rotation);
	while (get_next_record() && m_record_type != eObjectType) {
	if (!ProcessAttribute()) {
	switch (m_record_type) {
	case eExtraText:
	// Additional text that goes before the type 1 text
	// Note that if breaking the text into type-3 records splits a UFT-8 encoding we
	// do the decoding after splicing the lines together. I'm not sure if this
	// actually occurs, but handling the text this way will treat this condition
	// properly.
	case ePrimaryText:
	// final text is treated the same.
	// ORDER: We are asusming the type 1 record follows all the type 3's.
	textPrefix.append(m_record_data);
	break;
	default:
	break;
	}
	}
	}
	ResolveEntityAttributes();

	if ((this->*stringToUTF8)(textPrefix)) {
	OnReadText(insertionPoint, height, textPrefix, rotation);
	}
	else {
	ImportError("Unable to process encoding for TEXT/MTEXT '%s'\n", textPrefix);
	}
	repeat_last_record();
	return true;
	}

	bool CDxfRead::ReadEllipse()
	{
	Base::Vector3d centre;
	Base::Vector3d majorAxisEnd; // relative to centre
	double eccentricity = 0;
	double startAngleRadians = 0;
	double endAngleRadians = 2 * std::numbers::pi;

	Setup3DVectorAttribute(ePrimaryPoint, centre);
	Setup3DVectorAttribute(ePoint2, majorAxisEnd);
	SetupValueAttribute(eFloat1, eccentricity);
	SetupValueAttribute(eFloat2, startAngleRadians);
	SetupValueAttribute(eFloat3, endAngleRadians);
	ProcessAllEntityAttributes();

	OnReadEllipse(centre, majorAxisEnd, eccentricity, startAngleRadians, endAngleRadians);
	return true;
	}

	bool CDxfRead::ReadLwPolyLine()
	{
	VertexInfo currentVertex;
	list<VertexInfo> vertices;
	int flags = 0;

	bool have_x = false;
	bool have_y = false;

	// The documentation for LZPOLYLINE does not specify how you know if you have a new vertex.
	// It also does not specify where the bulge, line-width, etc for a particular segment are placed
	// relative to the two end vertices.
	// We assume here that if we see an X or Y coordinate but we already have the same coordinate,
	// a new vertex is starting, and any previous vertex is completely specified. Furthermore, line
	// attributes like bulge are placed between the X/Y coordinates for the vertex that starts the
	// stroke and the X/Y coordinates for the vertex that ends the stroke or the end of the entity.
	// In the latter case the stroke attributes apply to the closure stroke (if any) which ends at
	// the first vertex.
	Setup3DVectorAttribute(ePrimaryPoint, currentVertex.location);
	SetupValueAttribute(eFloat3, currentVertex.bulge);
	SetupValueAttribute(eInteger1, flags);
	while (get_next_record() && m_record_type != eObjectType) {
	if ((m_record_type == ePrimaryPoint + eXOffset && have_x)
	\|\| (m_record_type == ePrimaryPoint + eYOffset && have_y)) {
	// Starting a new vertex and there is a previous vertex. Save it and init a new one.
	vertices.push_back(currentVertex);
	currentVertex.location = Base::Vector3d();
	currentVertex.bulge = 0.0;
	have_x = m_record_type == ePrimaryPoint + eXOffset;
	have_y = m_record_type == ePrimaryPoint + eYOffset;
	}
	else if (m_record_type == ePrimaryPoint + eXOffset) {
	have_x = true;
	}
	else if (m_record_type == ePrimaryPoint + eYOffset) {
	have_y = true;
	}
	ProcessAttribute();
	}
	// At the end of the entity if we have vertex information use this as the final vertex.
	// (else it was a line with no vertices at all)
	if (have_x \|\| have_y) {
	vertices.push_back(currentVertex);
	}

	ResolveEntityAttributes();

	OnReadPolyline(vertices, flags);
	repeat_last_record();
	return true;
	}

	bool CDxfRead::ReadPolyLine()
	{
	VertexInfo currentVertex;
	list<VertexInfo> vertices;
	int flags = 0;

	SetupValueAttribute(eInteger1, flags);
	ProcessAllEntityAttributes();

	// We are now followed by a series of VERTEX entities followed by ENDSEQ.
	// To avoid eating and discarding the rest of the entieies if ENDSEQ is missing,
	// we quit on any unknown type-0 record.
	Setup3DVectorAttribute(ePrimaryPoint, currentVertex.location);
	SetupValueAttribute(eFloat3, currentVertex.bulge);
	while (get_next_record() && m_record_type == eObjectType && IsObjectName("VERTEX")) {
	// Set vertex defaults
	currentVertex.location = Base::Vector3d();
	currentVertex.bulge = 0.0;
	ProcessAllEntityAttributes();
	vertices.push_back(currentVertex);
	}
	if (!IsObjectName("SEQEND")) {
	ImportError("POLYLINE ends with '%s' record rather than 'SEQEND'\n", m_record_data);
	repeat_last_record();
	}

	OnReadPolyline(vertices, flags);
	return true;
	}

	bool CDxfRead::ReadInsert()
	{
	Base::Vector3d center;
	Base::Vector3d scale(1, 1, 1);
	double rotationDegrees = 0.0;
	std::string blockName;

	Setup3DVectorAttribute(ePrimaryPoint, center);
	SetupValueAttribute(eFloat2, scale.x);
	SetupValueAttribute(eFloat3, scale.y);
	SetupValueAttribute(eFloat4, scale.z);
	SetupValueAttribute(eAngleDegrees1, rotationDegrees);
	SetupStringAttribute(eName, blockName);
	ProcessAllEntityAttributes();
	OnReadInsert(center, scale, blockName, Base::toRadians(rotationDegrees));
	return (true);
	}

	bool CDxfRead::ReadDimension()
	{
	Base::Vector3d start;
	Base::Vector3d end;
	Base::Vector3d linePosition;
	Base::Vector3d textPosition;
	double rotation = 0;
	int dimensionType = 0; // This appears to default to zero

	// Per documentation:
	// 10 is the "dimension line location"
	// 11 is the midpoint of the dimension text
	// 13 is the start point of the 1st extension line
	// 14 is the start point of the 2nd extension line
	// 50 is the rotation of the dimension (the direction of the dimension line)
	// 52 (if present) is the angle relative to the dimension line for the extension lines; default
	// 90 degrees
	Setup3DVectorAttribute(ePoint4, start); // WCS
	Setup3DVectorAttribute(ePoint5, end); // WCS
	Setup3DVectorAttribute(ePrimaryPoint, linePosition); // WCS
	Setup3DVectorAttribute(ePoint2, textPosition); // OCS
	SetupValueAttribute(eAngleDegrees1, rotation);
	SetupValueAttribute(eInteger1, dimensionType);
	ProcessAllEntityAttributes();

	dimensionType &= eTypeMask; // Remove flags
	switch ((eDimensionType_t)dimensionType) {
	case eLinear:
	case eAligned:
	OnReadDimension(start, end, linePosition, dimensionType, Base::toRadians(rotation));
	break;
	default:
	UnsupportedFeature("Dimension type '%d'", dimensionType);
	break;
	}
	return true;
	}

	bool CDxfRead::ReadUnknownEntity()
	{
	ProcessAllEntityAttributes();
	UnsupportedFeature("Entity type '%s'", m_current_entity_name.c_str());
	return true;
	}

	bool CDxfRead::ReadBlockInfo()
	{
	int blockType = 0;
	std::string blockName;
	InitializeAttributes();
	// Both 2 and 3 are the block name.
	SetupStringAttribute(eName, blockName);
	SetupStringAttribute(eExtraText, blockName);
	SetupValueAttribute(eInteger1, blockType);
	ProcessAllAttributes();

	return OnReadBlock(blockName, blockType);
	}
	bool CDxfRead::ReadBlockContents()
	{
	while (get_next_record() && m_record_type == eObjectType && !IsObjectName("ENDBLK")) {
	if (IgnoreErrors()) {
	try {
	if (!ReadEntity()) {
	return false;
	}
	}
	catch (...) {
	}
	}
	else {
	if (!ReadEntity()) {
	return false;
	}
	}
	}
	return true;
	}
	bool CDxfRead::SkipBlockContents()
	{
	while (get_next_record() && m_record_type == eObjectType && !IsObjectName("ENDBLK")) {
	if (IgnoreErrors()) {
	try {
	ProcessAllAttributes();
	}
	catch (...) {
	}
	}
	else {
	ProcessAllAttributes();
	}
	}
	return true;
	}

	template<typename... args>
	void CDxfRead::UnsupportedFeature(const char* format, args&&... argValuess)
	{
	// NOLINTNEXTLINE(runtime/printf)
	std::string formattedMessage = fmt::sprintf(format, std::forward<args>(argValuess)...);
	m_stats.unsupportedFeatures[formattedMessage].emplace_back(
	m_current_entity_line_number,
	m_current_entity_handle
	);
	}

	bool CDxfRead::get_next_record()
	{
	if (m_repeat_last_record) {
	m_repeat_last_record = false;
	return m_not_eof;
	}

	do {
	if ((*m_ifs).eof()) {
	m_not_eof = false;
	return false;
	}

	std::getline(*m_ifs, m_record_data);
	++m_line;
	int temp = 0;
	if (!ParseValue<int>(this, &temp)) {
	ImportError(
	"CDxfRead::get_next_record() Failed to get integer record type from '%s'\n",
	m_record_data
	);
	return false;
	}
	m_record_type = (eDXFGroupCode_t)temp;
	if ((*m_ifs).eof()) {
	return false;
	}

	std::getline(*m_ifs, m_record_data);
	++m_line;
	} while (m_record_type == eComment);

	// Remove any carriage return at the end of m_str which may occur because of inconsistent
	// handling of LF vs. CRLF line termination.
	auto last = m_record_data.rbegin();
	if (last != m_record_data.rend() && *last == '\r') {
	m_record_data.pop_back();
	}
	// The code that was here just blindly trimmed leading white space, but if you have, for
	// instance, a TEXT entity whose text starts with spaces, or, more plausibly, a long TEXT entity
	// where the text is broken into one or more type-3 records with a final type-1 and the break
	// happens to be just before a space, this would be wrong.
	return true;
	}

	void CDxfRead::repeat_last_record()
	{
	m_repeat_last_record = true;
	}

	//
	// Intercepts for On... calls to derived class
	// (These have distinct signatures from the ones they call)
	bool CDxfRead::ExplodePolyline(std::list<VertexInfo>& vertices, int flags)
	{
	if (vertices.size() < 2) {
	// TODO: Warning
	return true;
	}

	bool closed = ((flags & 1) != 0);
	auto startVertex = vertices.end();
	if (closed) {
	// If the shape is closed, point at the last vertex. The first stroke drawn will be the
	// closure.
	--startVertex;
	}
	for (auto endVertex = vertices.begin(); endVertex != vertices.end(); endVertex++) {
	if (startVertex != vertices.end()) {
	if (startVertex->bulge != 0.0) {
	// Bulge is 1/4 tan(arc angle), positive for CCW arc.
	double cot = ((1.0 / startVertex->bulge) - startVertex->bulge) / 2;
	double cx = ((startVertex->location.x + endVertex->location.x)
	- ((endVertex->location.y - startVertex->location.y) * cot))
	/ 2;
	double cy = ((startVertex->location.y + endVertex->location.y)
	+ ((endVertex->location.x - startVertex->location.x) * cot))
	/ 2;
	Base::Vector3d pc(cx, cy, (startVertex->location.z + endVertex->location.z) / 2);
	OnReadArc(startVertex->location, endVertex->location, pc, startVertex->bulge >= 0, false);
	}
	else {
	OnReadLine(startVertex->location, endVertex->location, false);
	}
	}
	// elsethis is the first loop iteration on an open shape, endVertex is the first point, and
	// there is no closure line to draw engin there.
	startVertex = endVertex;
	}
	return true;
	}
	void CDxfRead::OnReadArc(
	double start_angle,
	double end_angle,
	double radius,
	const Base::Vector3d& center,
	double z_extrusion_dir,
	bool hidden
	)
	{
	Base::Vector3d temp(center);
	// Calculate the start and end points of the arc
	Base::Vector3d start(center);
	start.x += radius * cos(Base::toRadians(start_angle));
	start.y += radius * sin(Base::toRadians(start_angle));
	Base::Vector3d end(center);
	end.x += radius * cos(Base::toRadians(end_angle));
	end.y += radius * sin(Base::toRadians(end_angle));
	if (z_extrusion_dir < 0) {
	// This is a dumbed-down handling of general OCS. This only works
	// for arcs drawn exactly upside down (i.e. with the extrusion vector
	// being (0, 0, <0).
	// We treat this as 180-degree mirroring through the YZ plane
	// TODO: I don't even think this is correct, but it is functionally what the
	// code did before.
	temp.x = -temp.x;
	start.x = -start.x;
	end.x = -end.x;
	}
	OnReadArc(start, end, temp, true, hidden);
	}

	void CDxfRead::OnReadCircle(const Base::Vector3d& center, double radius, bool hidden)
	{
	// OnReadCircle wants a start point, so we pick an arbitrary point on the circumference
	Base::Vector3d start(center);
	start.x += radius;

	OnReadCircle(
	start,
	center,
	false,
	hidden
	); // false to change direction because otherwise the arc length is zero
	}

	// NOLINTBEGIN(bugprone-easily-swappable-parameters)
	void CDxfRead::OnReadEllipse(
	const Base::Vector3d& center,
	const Base::Vector3d& majorAxisEnd,
	double ratio,
	double start_angle,
	double end_angle
	)
	// NOLINTEND(bugprone-easily-swappable-parameters)
	{
	double major_radius = majorAxisEnd.Length();
	double minor_radius = major_radius * ratio;

	// Since we only support 2d stuff, we can calculate the rotation from the major axis x and y
	// value only, since z is zero, major_radius is the vector length

	double rotation = atan2(majorAxisEnd.y, majorAxisEnd.x);


	OnReadEllipse(center, major_radius, minor_radius, rotation, start_angle, end_angle, true);
	}

	bool CDxfRead::ReadVersion()
	{
	static const std::vector<std::string> VersionNames = {
	// This table is indexed by eDXFVersion_t - (ROlder+1)
	"AC1006",
	"AC1009",
	"AC1012",
	"AC1014",
	"AC1015",
	"AC1018",
	"AC1021",
	"AC1024",
	"AC1027",
	"AC1032"
	};

	assert(VersionNames.size() == RNewer - ROlder - 1);
	get_next_record(); // Get the value for the variable
	auto first = VersionNames.cbegin();
	auto last = VersionNames.cend();
	auto found = std::lower_bound(first, last, m_record_data);
	if (found == last) {
	m_version = RNewer;
	}
	else if (*found == m_record_data) {
	m_version = (eDXFVersion_t)((int)std::distance(first, found) + (ROlder + 1));
	}
	else if (found == first) {
	m_version = ROlder;
	}
	else {
	m_version = RUnknown;
	}

	m_stats.dxfVersion = m_record_data;

	return ResolveEncoding();
	}

	bool CDxfRead::ReadDWGCodePage()
	{
	get_next_record(); // Get the value for the variable
	assert(m_CodePage.empty()); // If not, we have found two DWGCODEPAGE variables or DoRead
	// was called twice on the same CDxfRead object.
	m_CodePage = m_record_data;

	return ResolveEncoding();
	}

	bool CDxfRead::ResolveEncoding()
	{
	if (m_version >= R2007) { // Note this does not include RUnknown, but does include RLater
	m_encoding = "utf_8";
	stringToUTF8 = &CDxfRead::UTF8ToUTF8;
	}
	else if (m_CodePage.empty()) {
	// cp1252
	m_encoding = "cp1252";
	stringToUTF8 = &CDxfRead::GeneralToUTF8;
	}
	else {
	// Codepage names may be of the form "ansi_1252" which we map to "cp1252" but we don't map
	// "ansi_x3xxxx" (which happens to mean "ascii")
	// Also some DXF files have the codepage name in uppercase so we lowercase it.
	m_encoding = m_CodePage;
	std::transform(m_encoding.begin(), m_encoding.end(), m_encoding.begin(), ::tolower);

	// Add mapping for common non-standard encoding names.
	if (m_encoding == "8859_1") {
	m_encoding = "iso-8859-1"; // Replace with a name Python understands
	}

	// NOLINTNEXTLINE(readability/nolint)
	#define ANSI_ENCODING_PREFIX "ansi_" // NOLINT(cppcoreguidelines-macro-usage)
	if (m_encoding.rfind(ANSI_ENCODING_PREFIX, 0) == 0 && m_encoding.rfind("ansi_x3", 0) != 0) {
	m_encoding.replace(0, (sizeof ANSI_ENCODING_PREFIX) - 1, "cp");
	}
	// At this point we want to recognize synonyms for "utf_8" and use the custom decoder
	// function. This is because this is one of the common cases and our decoder function is a
	// fast no-op. We don't actually use the decoder function we get from PyCodec_Decoder
	// because to call it we have to convert the (char *) text into a 'bytes' object first so we
	// can pass it to the function using PyObject_Callxxx(), getting the PYObject containing the
	// Python string, which we then decode back to UTF-8. It is simpler to call
	// PyUnicode_DecodeXxxx which takes a (const char *) and is just a direct c++ callable.
	Base::PyGILStateLocker lock;
	PyObject* pyDecoder = PyCodec_Decoder(m_encoding.c_str());
	if (pyDecoder == nullptr) {
	// PyCodec_Decoder failed, which means Python could not find the encoding.
	// This sets a Python LookupError. We clear this low-level error because
	// our caller will throw a more informative, high-level exception.
	PyErr_Clear();
	return false;
	}
	PyObject* pyUTF8Decoder = PyCodec_Decoder("utf_8");
	assert(pyUTF8Decoder != nullptr);
	if (pyDecoder == pyUTF8Decoder) {
	stringToUTF8 = &CDxfRead::UTF8ToUTF8;
	}
	else {
	stringToUTF8 = &CDxfRead::GeneralToUTF8;
	}
	Py_DECREF(pyDecoder);
	Py_DECREF(pyUTF8Decoder);
	}

	m_stats.dxfEncoding = m_encoding;

	return !m_encoding.empty();
	}

	// NOLINTNEXTLINE(readability/nolint)
	// NOLINTNEXTLINE(readability-convert-member-functions-to-static)
	bool CDxfRead::UTF8ToUTF8(std::string& /encoded/) const
	{
	return true;
	}

	bool CDxfRead::GeneralToUTF8(std::string& encoded) const
	{
	Base::PyGILStateLocker lock;
	PyObject* decoded
	= PyUnicode_Decode(encoded.c_str(), (Py_ssize_t)encoded.length(), m_encoding.c_str(), "strict");
	if (decoded == nullptr) {
	return false;
	}
	const char* converted = PyUnicode_AsUTF8(decoded);
	// converted has the same lifetime as decoded so we don't have to delete it.
	if (converted != nullptr) {
	encoded = converted;
	}
	Py_DECREF(decoded);
	return converted != nullptr;
	}

	void CDxfRead::DoRead(const bool ignore_errors /* = false */)
	{
	m_ignore_errors = ignore_errors;
	if (m_fail) {
	return;
	}

	try {
	StartImport();
	// Loop reading the sections.
	while (get_next_record()) {
	if (m_record_type != eObjectType) {
	ImportError(
	"Found type %d record when expecting start of a SECTION or EOF\n",
	(int)m_record_type
	);
	continue;
	}
	if (IsObjectName("EOF")) { // TODO: Check for drivel beyond EOF record
	break;
	}
	if (!IsObjectName("SECTION")) {
	ImportError(
	"Found %s record when expecting start of a SECTION\n",
	m_record_data.c_str()
	);
	continue;
	}
	if (!ReadSection()) {
	throw Base::Exception("Failed to read DXF section (returned false).");
	}
	}
	FinishImport();
	}
	catch (const Base::Exception& e) {
	// This catches specific FreeCAD exceptions and re-throws them.
	throw;
	}
	catch (const std::exception& e) {
	// This catches all standard C++ exceptions and converts them
	// to a FreeCAD exception, which the binding layer can handle.
	throw Base::Exception(e.what());
	}
	catch (...) {
	// This is a catch-all for any other non-standard C++ exceptions.
	throw Base::Exception("An unknown, non-standard C++ exception occurred during DXF import.");
	}
	}

	bool CDxfRead::ReadSection()
	{
	if (!get_next_record()) {
	throw Base::Exception("Unexpected end of file after SECTION tag.");
	}
	if (m_record_type != eName) {
	ImportError("Ignored SECTION with no name record\n");
	return ReadIgnoredSection();
	}

	if (IsObjectName("HEADER")) {
	if (!ReadHeaderSection()) {
	throw Base::Exception("Failed while reading HEADER section.");
	}
	return true;
	}
	if (IsObjectName("TABLES")) {
	if (!ReadTablesSection()) {
	throw Base::Exception("Failed while reading TABLES section.");
	}
	return true;
	}
	if (IsObjectName("BLOCKS")) {
	if (!ReadBlocksSection()) {
	throw Base::Exception("Failed while reading BLOCKS section.");
	}
	return true;
	}
	if (IsObjectName("ENTITIES")) {
	if (!ReadEntitiesSection()) {
	throw Base::Exception("Failed while reading ENTITIES section.");
	}
	return true;
	}

	if (!ReadIgnoredSection()) {
	throw Base::Exception("Failed while reading an unknown/ignored section.");
	}

	return true;
	}

	void CDxfRead::ProcessLayerReference(CDxfRead* object, void* target)
	{
	if (!object->Layers.contains(object->m_record_data)) {
	object->ImportError("First reference to missing Layer '%s'", object->m_record_data);
	// Synthesize the Layer so we don't get the same error again.
	// We need to take copies of the string arguments because MakeLayer uses them as move
	// inputs.
	object->Layers[object->m_record_data]
	= object->MakeLayer(object->m_record_data, DefaultColor, std::string(DefaultLineType));
	}
	static_cast<Layer*>(target) = object->Layers.at(object->m_record_data);
	}
	bool CDxfRead::ReadEntity()
	{
	m_current_entity_line_number = m_line;
	m_current_entity_name = m_record_data;
	InitializeAttributes();
	m_entityAttributes.SetDefaults();
	m_current_entity_handle.clear();
	SetupStringAttribute(eHandle, m_current_entity_handle);
	EntityNormalVector.Set(0, 0, 1);
	Setup3DVectorAttribute(eExtrusionDirection, EntityNormalVector);
	SetupStringAttribute(eLinetypeName, m_entityAttributes.m_LineType);
	m_coordinate_attributes.emplace(
	eLayerName,
	std::pair(&ProcessLayerReference, &m_entityAttributes.m_Layer)
	);
	SetupValueAttribute(
	eCoordinateSpace,
	m_entityAttributes.m_paperSpace
	); // TODO: Ensure the stream is noboolalpha (for that
	// matter ensure the stream has the "C" locale
	SetupValueAttribute(eColor, m_entityAttributes.m_Color);

	m_stats.entityCounts[m_record_data]++;

	// The entity record is already the current record and is already checked as a type 0 record
	if (IsObjectName("LINE")) {
	return ReadLine();
	}
	if (IsObjectName("ARC")) {
	return ReadArc();
	}
	if (IsObjectName("CIRCLE")) {
	return ReadCircle();
	}
	if (IsObjectName("MTEXT")) {
	return ReadText();
	}
	if (IsObjectName("TEXT")) {
	return ReadText();
	}
	if (IsObjectName("ELLIPSE")) {
	return ReadEllipse();
	}
	if (IsObjectName("SPLINE")) {
	return ReadSpline();
	}
	if (IsObjectName("LWPOLYLINE")) {
	return ReadLwPolyLine();
	}
	if (IsObjectName("POLYLINE")) {
	return ReadPolyLine();
	}
	if (IsObjectName("POINT")) {
	return ReadPoint();
	}
	if (IsObjectName("INSERT")) {
	return ReadInsert();
	}
	if (IsObjectName("DIMENSION")) {
	return ReadDimension();
	}
	return ReadUnknownEntity();
	}

	bool CDxfRead::ReadHeaderSection()
	{
	// Read to the next ENDSEC record marking the end of the section.
	// This section contains variables, most of which we ignore. Each one is a type-9 record giving
	// the variable name, followed by a single record giving the value; the record type depends on
	// the variable's data type.
	while (get_next_record()) {
	if (m_record_type == eObjectType && IsObjectName("ENDSEC")) {
	if (m_unitScalingFactor == 0.0) {
	// Neither INSUNITS nor MEASUREMENT found, assume 1 DXF unit = 1mm
	// TODO: Perhaps this default should depend on the current project's unit system
	m_unitScalingFactor = m_additionalScaling;
	m_stats.fileUnits = "Unspecified (Defaulting to 1:1)";
	}
	m_stats.finalScalingFactor = m_unitScalingFactor;
	return true;
	}
	if (m_record_type != eVariableName) {
	continue; // Quietly ignore unknown record types
	}

	// Store the variable name before we try to read its value.
	std::string currentVarName = m_record_data;
	if (!ReadVariable()) {
	// If ReadVariable returns false, throw an exception with the variable name.
	throw Base::Exception("Failed while reading value for HEADER variable: " + currentVarName);
	}
	}

	// If the loop finishes without finding ENDSEC, it's an error.
	throw Base::Exception("Unexpected end of file inside HEADER section.");
	}

	bool CDxfRead::ReadVariable()
	{
	if (IsVariableName("$INSUNITS")) {
	get_next_record(); // Get the value for the variable
	int varValue = 0;
	if (!ParseValue<int>(this, &varValue)) {
	ImportError("Failed to get integer from INSUNITS value '%s'\n", m_record_data);
	}
	else {
	auto units = DxfUnits::eDxfUnits_t(varValue);
	if (!DxfUnits::IsValid(units)) {
	units = DxfUnits::eUnspecified;
	}
	m_unitScalingFactor = DxfUnits::Factor(units) * m_additionalScaling;
	m_stats.scalingSource = "$INSUNITS";
	m_stats.fileUnits = DxfUnitToString(units);
	}
	return true;
	}
	if (IsVariableName("$MEASUREMENT")) {
	get_next_record();
	int varValue = 1;
	if (m_unitScalingFactor == 0.0 && ParseValue<int>(this, &varValue)) {
	auto units = (varValue != 0 ? DxfUnits::eMillimeters : DxfUnits::eInches);
	m_unitScalingFactor = DxfUnits::Factor(units) * m_additionalScaling;
	m_stats.scalingSource = "$MEASUREMENT";
	m_stats.fileUnits = DxfUnitToString(units);
	}
	return true;
	}
	if (IsVariableName("$ACADVER")) {
	return ReadVersion();
	}
	if (IsVariableName("$DWGCODEPAGE")) {
	return ReadDWGCodePage();
	}
	// any other variable, skip its value
	return get_next_record();
	}

	bool CDxfRead::ReadTablesSection()
	{
	// Read to the next ENDSEC record marking the end of the section.
	// This section contains various tables, many of which we ignore. Each one is a type-0 TABLE
	// record followed by a type-2 (name) record giving the table name, followed by the table
	// contents. Each set of contents is terminates by the next type-0 TABLE or ENDSEC directive.
	while (get_next_record()) {
	if (m_record_type != eObjectType) {
	continue; // Ignore any non-type-0 contents in the section.
	}
	if (IsObjectName("ENDSEC")) {
	return true;
	}
	if (!IsObjectName("TABLE")) {
	continue; // Ignore any type-0 non-TABLE contents in the section
	}
	get_next_record();
	if (m_record_type != eName) {
	ImportError("Found unexpected type %d record instead of table name\n", (int)m_record_type);
	}
	else if (IsObjectName("LAYER")) {
	if (!ReadLayerTable()) {
	return false;
	}
	}
	else {
	if (!ReadIgnoredTable()) {
	return false;
	}
	}
	}
	return false;
	}

	bool CDxfRead::ReadIgnoredSection()
	{
	// Read to the next ENDSEC record marking the end of the section.
	while (get_next_record()) {
	if (m_record_type == eObjectType && IsObjectName("ENDSEC")) {
	return true;
	}
	}
	return false;
	}

	bool CDxfRead::ReadBlocksSection()
	{
	// Read to the next ENDSEC record marking the end of the section.
	// Within this section we should find type-0 BLOCK groups
	while (get_next_record()) {
	if (m_record_type != eObjectType) {
	continue; // quietly ignore non-type-0 records;
	}
	if (IsObjectName("ENDSEC")) {
	// End of section
	return true;
	}
	if (!IsObjectName("BLOCK")) {
	continue; // quietly ignore non-BLOCK records
	}
	if (!ReadBlockInfo()) {
	ImportError("CDxfRead::DoRead() Failed to read block\n");
	}
	}

	return false;
	}

	bool CDxfRead::ReadEntitiesSection()
	{
	// Read to the next ENDSEC record marking the end of the section.
	// Within this section we should find type-0 BLOCK groups
	while (get_next_record()) {
	if (m_record_type != eObjectType) {
	continue; // quietly ignore non-type-0 records;
	}
	if (IsObjectName("ENDSEC")) {
	// End of section
	return true;
	}
	if (IgnoreErrors()) {
	try {
	if (!ReadEntity()) {
	return false;
	}
	}
	catch (const Base::Exception& e) {
	e.reportException();
	}
	catch (...) {
	ImportError("CDxfRead::ReadEntity raised unknown exception\n");
	}
	}
	else {
	if (!ReadEntity()) {
	return false;
	}
	}
	}

	return false;
	}

	bool CDxfRead::ReadLayer()
	{
	std::string layername;
	ColorIndex_t layerColor = DefaultColor;
	int layerFlags = 0;
	std::string lineTypeName(DefaultLineType);
	InitializeAttributes();

	SetupStringAttribute(eName, layername);
	SetupValueAttribute(eColor, layerColor);
	SetupValueAttribute(eInteger1, layerFlags);
	SetupStringAttribute(eLinetypeName, lineTypeName);
	ProcessAllAttributes();
	if (layername.empty()) {
	ImportError("CDxfRead::ReadLayer() - no layer name\n");
	return false;
	}
	if ((layerFlags & 0x01) != 0) {
	// Frozen layers are implicitly hidden which we don't do yet.
	// TODO: Should have an import option to omit frozen layers.
	UnsupportedFeature("Frozen layers");
	}
	Layers[layername] = MakeLayer(layername, layerColor, std::move(lineTypeName));
	return true;
	}
	CDxfRead::Layer* CDxfRead::MakeLayer(const std::string& name, ColorIndex_t color, std::string&& lineType)
	{
	return new Layer(name, color, std::move(lineType));
	}

	bool CDxfRead::ReadLayerTable()
	{
	// Read to the next TABLE record indicating another table in the TABLES section, or to the
	// ENDSEC record marking the end of the TABLES section. This table contains a series of type-0
	// LAYER groups
	while (get_next_record()) {
	if (m_record_type != eObjectType) {
	continue; // quietly ignore non-type-0 records; this table has some preamble
	}
	if (IsObjectName("TABLE") \|\| IsObjectName("ENDSEC")) {
	// End of table
	repeat_last_record();
	return true;
	}
	if (!IsObjectName("LAYER")) {
	continue; // quietly ignore non-LAYER records
	}
	if (!ReadLayer()) {
	ImportError("CDxfRead::DoRead() Failed to read layer\n");
	}
	}

	return false;
	}

	bool CDxfRead::ReadIgnoredTable()
	{
	// Read to the next TABLE record indicating another table in the TABLES section, or to the
	// ENDSEC record marking the end of the TABLES section.
	while (get_next_record()) {
	if (m_record_type == eObjectType && (IsObjectName("TABLE") \|\| IsObjectName("ENDSEC"))) {
	repeat_last_record();
	return true;
	}
	}
	return false;
	}

	// NOLINTBEGIN(cppcoreguidelines-avoid-magic-numbers, readability-magic-numbers)
	inline static double level(int distance, double blackLevel)
	{
	// Distance is the number of 24ths around the color wheel between the desired hue and
	// the primary hue in question. Coming in it is a ordinate difference and so can be negative
	// so the first thing we do is take its absolute value.
	if (distance < 0) {
	distance = -distance;
	}
	// If the distance is greater than 12, it is measuring the long way around the color wheel so we
	// reduce it to measuring along the short way instead
	if (distance > 12) {
	distance = 24 - distance;
	}
	if (distance <= 4) {
	// A distance 4 or less givs full intensity of the primary color
	return 1.0;
	}
	if (distance < 8) {
	// Between 4 and 8 gives a blend of the full primary and the black level
	return ((8 - distance) + blackLevel * (distance - 4)) / 4;
	}
	// 8 and beyond yield the black level
	return blackLevel;
	}
	inline static Base::Color wheel(int hue, double blackLevel, double multiplier = 1.0)
	{
	return Base::Color(
	(float)(level(hue - 0, blackLevel) * multiplier),
	(float)(level(hue - 8, blackLevel) * multiplier),
	(float)(level(hue - 16, blackLevel) * multiplier)
	);
	}
	Base::Color CDxfRead::ObjectColor(ColorIndex_t index)
	{
	// TODO: If it is ColorByBlock we need to use the color of the INSERT entity.
	// This is tricky because a block can itself contain INSERT entities and we don't currently
	// record the required information. IIRC INSERT in a block will do something strange like
	// try to insert the block into the main drawing instead of into the block being defined.

	// The first 7 colors (1-7) have ad hoc names red, yellow, green, cyan, blue, magenta, and
	// black. 8, 9, 250-254 are lightening shades of gray. These are rendered by the app in a manner
	// to contrast with the background color.
	// For others, (color/10) determines the hue around the
	// color circle, with even numbers fading to black on the tens digit,
	// and odd numberd being blended with AA and again fading to black.
	// The fade is FF BD 81 68 4F (100%, 74%, 50%, 40%, 30%) indexed by (index/2)%5
	// The AA fades as AA 7E 56 45 35 which is almost the exact same percentages.
	// For hue, (index-10)/10 : 0 is ff0000, and each step linearly adds green until 4 is pure
	// yellow ffff00, then red starts to fade... until but not including 24 which is back to ff0000.
	Base::Color result = Base::Color();
	if (index == 0) {
	// Technically, 0 is BYBLOCK and not a real color, but all that means is that an object in a
	// block cannot specifically ask to be black. These colors are all contrasted to the
	// background so there is no objective black colour, through 255 is an objective white.
	result = Base::Color();
	}
	else if (index < 7) {
	result = wheel((index - 1) * 4, 0x00);
	}
	else if (index == 7) {
	// DXF color 7 is "black/white" and should adapt to the background.
	// Since we cannot easily query the background theme from here, we will use a
	// neutral mid-gray, which is visible on both light and dark themes.
	result = Base::Color(0.5f, 0.5f, 0.5f);
	}
	else if (index == 8) {
	result = Base::Color(0.5, 0.5, 0.5);
	}
	else if (index == 9) {
	result = Base::Color(0.75, 0.75, 0.75);
	}
	else if (index >= 250) {
	auto brightness = (float)((index - 250 + (255 - index) * 0.2) / 5);
	result = Base::Color(brightness, brightness, brightness);
	}
	else {
	static const std::array<float, 5> fades = {1.00F, 0.74F, 0.50F, 0.40F, 0.30F};
	return wheel(index / 10 - 1, (index & 1) != 0 ? 0.69 : 0, fades[(index / 2) % 5]);
	}
	// TODO: These colors are modified to contrast with the background. In the original program
	// this is just a rendering feature, but FreeCAD does not support this so the user has the
	// option of modifying the colors to contrast with the background at time of import.
	return result;
	}
	// NOLINTEND(cppcoreguidelines-avoid-magic-numbers, readability-magic-numbers)

	template void CDxfRead::UnsupportedFeature<>(const char*);