12008475829

Committed 25 Nov 2024 10:52AM UTC coverage: 75.339% (-0.3%) from 75.668%

Build # 12008475829

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Commit Message

Merge pull request #494 from DomCR/Issue-487_DBCOLOR

Issue 487 dbcolor

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42.16

/src/ACadSharp/IO/DWG/DwgStreamWriters/DwgObjectWriter.Objects.cs

﻿using ACadSharp.Objects;
using CSMath;
using CSUtilities.Converters;
using CSUtilities.IO;
using System;
using System.IO;
using System.Linq;

namespace ACadSharp.IO.DWG
{
        internal partial class DwgObjectWriter : DwgSectionIO
        {
                private void writeObjects()
                {
                        while (this._objects.Any())
                        {
                                CadObject obj = this._objects.Dequeue();

                                this.writeObject(obj);
                        }
                }

                private void writeObject(CadObject obj)
                {
                        switch (obj)
                        {
                                case Material:
                                case MultiLeaderAnnotContext:
                                case MultiLeaderStyle:
                                case SortEntitiesTable:
                                case UnknownNonGraphicalObject:
                                case VisualStyle:
                                        this.notify($"Object type not implemented {obj.GetType().FullName}", NotificationType.NotImplemented);
                                        return;
                        }

                        if (obj is XRecord && !this.WriteXRecords)
                        {
                                return;
                        }

                        this.writeCommonNonEntityData(obj);

                        switch (obj)
                        {
                                case AcdbPlaceHolder acdbPlaceHolder:
                                        this.writeAcdbPlaceHolder(acdbPlaceHolder);
                                        break;
                                case BookColor bookColor:
                                        this.writeBookColor(bookColor);
                                        break;
                                case CadDictionaryWithDefault dictionarydef:
                                        this.writeCadDictionaryWithDefault(dictionarydef);
                                        break;
                                case CadDictionary dictionary:
                                        this.writeDictionary(dictionary);
                                        break;
                                case DictionaryVariable dictionaryVariable:
                                        this.writeDictionaryVariable(dictionaryVariable);
                                        break;
                                case Group group:
                                        this.writeGroup(group);
                                        break;
                                case ImageDefinitionReactor definitionReactor:
                                        this.writeImageDefinitionReactor(definitionReactor);
                                        break;
                                case ImageDefinition definition:
                                        this.writeImageDefinition(definition);
                                        break;
                                case Layout layout:
                                        this.writeLayout(layout);
                                        break;
                                case MLineStyle style:
                                        this.writeMLineStyle(style);
                                        break;
                                case MultiLeaderStyle multiLeaderStyle:
                                        this.writeMultiLeaderStyle(multiLeaderStyle);
                                        break;
                                case PlotSettings plotsettings:
                                        this.writePlotSettings(plotsettings);
                                        break;
                                case Scale scale:
                                        this.writeScale(scale);
                                        break;
                                case SortEntitiesTable sorttables:
                                        this.writeSortEntitiesTable(sorttables);
                                        break;
                                case XRecord record:
                                        this.writeXRecord(record);
                                        break;
                                default:
                                        throw new NotImplementedException($"Object not implemented : {obj.GetType().FullName}");
                        }

                        this.registerObject(obj);
                }

                private void writeAcdbPlaceHolder(AcdbPlaceHolder acdbPlaceHolder)
                {
                }

                private void writeBookColor(BookColor color)
                {
                        this._writer.WriteBitShort(0);

                        if (this.R2004Plus)
                        {
                                byte[] arr = new byte[]
                                {
                                        color.Color.B,
                                        color.Color.G,
                                        color.Color.R,
                                        0b11000010
                                };

                                uint rgb = LittleEndianConverter.Instance.ToUInt32(arr);

                                this._writer.WriteBitLong((int)rgb);

                                byte flags = 0;
                                if (!string.IsNullOrEmpty(color.ColorName))
                                {
                                        flags = (byte)(flags | 1u);
                                }

                                if (!string.IsNullOrEmpty(color.BookName))
                                {
                                        flags = (byte)(flags | 2u);
                                }

                                this._writer.WriteByte(flags);
                                if (!string.IsNullOrEmpty(color.ColorName))
                                {
                                        this._writer.WriteVariableText(color.ColorName);
                                }

                                if (!string.IsNullOrEmpty(color.BookName))
                                {
                                        this._writer.WriteVariableText(color.BookName);
                                }
                        }
                }

                private void writeCadDictionaryWithDefault(CadDictionaryWithDefault dictionary)
                {
                        this.writeDictionary(dictionary);

                        //H 7 Default entry (hard pointer)
                        this._writer.HandleReference(DwgReferenceType.HardPointer, dictionary.DefaultEntry);
                }

                private void writeDictionary(CadDictionary dictionary)
                {
                        //Common:
                        //Numitems L number of dictonary items
                        this._writer.WriteBitLong(dictionary.Count());

                        //R14 Only:
                        if (this._version == ACadVersion.AC1014)
                        {
                                //Unknown R14 RC Unknown R14 byte, has always been 0
                                this._writer.WriteByte(0);
                        }

                        //R2000 +:
                        if (this.R2000Plus)
                        {
                                //Cloning flag BS 281
                                this._writer.WriteBitShort((short)dictionary.ClonningFlags);
                                this._writer.WriteByte((byte)(dictionary.HardOwnerFlag ? 1u : 0u));
                        }

                        //Common:
                        foreach (var item in dictionary)
                        {
                                if (item is XRecord && !this.WriteXRecords)
                                {
                                        return;
                                }

                                if (item is UnknownNonGraphicalObject)
                                {
                                        return;
                                }

                                this._writer.WriteVariableText(item.Name);
                                this._writer.HandleReference(DwgReferenceType.SoftOwnership, item.Handle);
                        }

                        this.addEntriesToWriter(dictionary);
                }

                private void addEntriesToWriter(CadDictionary dictionary)
                {
                        foreach (CadObject e in dictionary)
                        {
                                this._objects.Enqueue(e);
                        }
                }

                private void writeDictionaryVariable(DictionaryVariable dictionaryVariable)
                {
                        //Intval RC an integer value
                        this._writer.WriteByte(0);

                        //BS a string
                        this._writer.WriteVariableText(dictionaryVariable.Value);
                }

                private void writeGroup(Group group)
                {
                        //Str TV name of group
                        this._writer.WriteVariableText(group.Description);

                        //Unnamed BS 1 if group has no name
                        this._writer.WriteBitShort((short)(group.IsUnnamed ? 1 : 0));
                        //Selectable BS 1 if group selectable
                        this._writer.WriteBitShort((short)(group.Selectable ? 1 : 0));

                        //Numhandles BL # objhandles in this group
                        this._writer.WriteBitLong(group.Entities.Count);
                        foreach (ulong h in group.Entities.Keys)
                        {
                                //the entries in the group(hard pointer)
                                this._writer.HandleReference(DwgReferenceType.HardPointer, h);
                        }
                }

                private void writeImageDefinitionReactor(ImageDefinitionReactor definitionReactor)
                {
                        //Common:
                        //Classver BL 90 class version
                        this._writer.WriteBitLong(definitionReactor.ClassVersion);
                }

                private void writeImageDefinition(ImageDefinition definition)
                {
                        //Common:
                        //Clsver BL 0 class version
                        this._writer.WriteBitLong(definition.ClassVersion);
                        //Imgsize 2RD 10 size of image in pixels
                        this._writer.Write2RawDouble(definition.Size);
                        //Filepath TV 1 path to file
                        this._writer.WriteVariableText(definition.FileName);
                        //Isloaded B 280 0==no, 1==yes
                        this._writer.WriteBit(definition.IsLoaded);
                        //Resunits RC 281 0==none, 2==centimeters, 5==inches
                        this._writer.WriteByte((byte)definition.Units);
                        //Pixelsize 2RD 11 size of one pixel in AutoCAD units
                        this._writer.Write2RawDouble(definition.DefaultSize);
                }

                private void writeLayout(Layout layout)
                {
                        this.writePlotSettings(layout);

                        //Common:
                        //Layout name TV 1 layout name
                        this._writer.WriteVariableText(layout.Name);
                        //Tab order BL 71 layout tab order
                        this._writer.WriteBitLong(layout.TabOrder);
                        //Flag BS 70 layout flags
                        this._writer.WriteBitShort((short)layout.LayoutFlags);
                        //Ucs origin 3BD 13 layout ucs origin
                        this._writer.Write3BitDouble(layout.Origin);
                        //Limmin 2RD 10 layout minimum limits
                        this._writer.Write2RawDouble(layout.MinLimits);
                        //Limmax 2RD 11 layout maximum limits
                        this._writer.Write2RawDouble(layout.MinLimits);
                        //Inspoint 3BD 12 layout insertion base point
                        this._writer.Write3BitDouble(layout.InsertionBasePoint);
                        this._writer.Write3BitDouble(layout.XAxis);
                        this._writer.Write3BitDouble(layout.YAxis);
                        this._writer.WriteBitDouble(layout.Elevation);
                        this._writer.WriteBitShort((short)layout.UcsOrthographicType);
                        this._writer.Write3BitDouble(layout.MinExtents);
                        this._writer.Write3BitDouble(layout.MaxExtents);

                        //R2004 +:
                        if (this.R2004Plus)
                        {
                                //Viewport count RL # of viewports in this layout
                                this._writer.WriteBitLong(layout.Viewports.Count());
                        }

                        //Common:
                        //330 associated paperspace block record handle(soft pointer)
                        this._writer.HandleReference(DwgReferenceType.SoftPointer, layout.AssociatedBlock);
                        //331 last active viewport handle(soft pointer)
                        this._writer.HandleReference(DwgReferenceType.SoftPointer, layout.Viewport);

                        //If not present and 76 code is non-zero, then base UCS is taken to be WORLD
                        if (layout.UcsOrthographicType == OrthographicType.None)
                        {
                                //346 base ucs handle(hard pointer)
                                this._writer.HandleReference(DwgReferenceType.HardPointer, null);
                                //345 named ucs handle(hard pointer)
                                this._writer.HandleReference(DwgReferenceType.HardPointer, layout.UCS);
                        }
                        else
                        {
                                //346 base ucs handle(hard pointer)
                                this._writer.HandleReference(DwgReferenceType.HardPointer, layout.BaseUCS);
                                //345 named ucs handle(hard pointer)
                                this._writer.HandleReference(DwgReferenceType.HardPointer, null);
                        }

                        //R2004+:
                        if (this.R2004Plus)
                        {
                                foreach (Entities.Viewport viewport in layout.Viewports)
                                {
                                        //Viewport handle(repeats Viewport count times) (soft pointer)
                                        this._writer.HandleReference(DwgReferenceType.SoftPointer, viewport);
                                }
                        }
                }

                private void writeMLineStyle(MLineStyle mlineStyle)
                {
                        //Common:
                        //Name TV Name of this style
                        this._writer.WriteVariableText(mlineStyle.Name);
                        //Desc TV Description of this style
                        this._writer.WriteVariableText(mlineStyle.Description);

                        short flags = 0;
                        if (mlineStyle.Flags.HasFlag(MLineStyleFlags.DisplayJoints))
                        {
                                flags = (short)(flags | 1U);
                        }
                        if (mlineStyle.Flags.HasFlag(MLineStyleFlags.FillOn))
                        {
                                flags = (short)(flags | 2U);
                        }
                        if (mlineStyle.Flags.HasFlag(MLineStyleFlags.StartSquareCap))
                        {
                                flags = (short)(flags | 16U);
                        }
                        if (mlineStyle.Flags.HasFlag(MLineStyleFlags.StartRoundCap))
                        {
                                flags = (short)(flags | 0x20);
                        }
                        if (mlineStyle.Flags.HasFlag(MLineStyleFlags.StartInnerArcsCap))
                        {
                                flags = (short)(flags | 0x40);
                        }
                        if (mlineStyle.Flags.HasFlag(MLineStyleFlags.EndSquareCap))
                        {
                                flags = (short)(flags | 0x100);
                        }
                        if (mlineStyle.Flags.HasFlag(MLineStyleFlags.EndRoundCap))
                        {
                                flags = (short)(flags | 0x200);
                        }
                        if (mlineStyle.Flags.HasFlag(MLineStyleFlags.EndInnerArcsCap))
                        {
                                flags = (short)(flags | 0x400);
                        }

                        //Flags BS A short which reconstitutes the mlinestyle flags as defined in DXF.
                        this._writer.WriteBitShort(flags);

                        //fillcolor CMC Fill color for this style
                        this._writer.WriteCmColor(mlineStyle.FillColor);
                        //startang BD Start angle
                        this._writer.WriteBitDouble(mlineStyle.StartAngle);
                        //endang BD End angle
                        this._writer.WriteBitDouble(mlineStyle.EndAngle);

                        //linesinstyle RC Number of lines in this style
                        this._writer.WriteByte((byte)mlineStyle.Elements.Count);
                        foreach (MLineStyle.Element element in mlineStyle.Elements)
                        {
                                //Offset BD Offset of this segment
                                this._writer.WriteBitDouble(element.Offset);
                                //Color CMC Color of this segment
                                this._writer.WriteCmColor(element.Color);
                                //R2018+:
                                if (this.R2018Plus)
                                {
                                        //Line type handle H Line type handle (hard pointer)
                                        this._writer.HandleReference(DwgReferenceType.HardPointer, element.LineType);
                                }
                                //Before R2018:
                                else
                                {
                                        //TODO: Fix the Linetype index for dwgReader and DwgWriter
                                        //Ltindex BS Linetype index (yes, index)
                                        this._writer.WriteBitShort(0);
                                }
                        }
                }

                private void writeMultiLeaderStyle(MultiLeaderStyle mLeaderStyle)
                {
                        //TODO: Remove this line when MultiLeaderStyle is fixed for writing
                        return;

                        if (!R2010Plus)
                        {
                                return;
                        }

                        //        BS        179        Version expected: 2
                        this._writer.WriteBitShort(2);

                        //        BS        170        Content type (see paragraph on LEADER for more details).
                        this._writer.WriteBitShort((short)mLeaderStyle.ContentType);
                        //        BS        171        Draw multi-leader order (0 = draw content first, 1 = draw leader first)
                        this._writer.WriteBitShort((short)mLeaderStyle.MultiLeaderDrawOrder);
                        //        BS        172        Draw leader order (0 = draw leader head first, 1 = draw leader tail first)
                        this._writer.WriteBitShort((short)mLeaderStyle.LeaderDrawOrder);
                        //        BL        90        Maximum number of points for leader
                        this._writer.WriteBitShort((short)mLeaderStyle.MaxLeaderSegmentsPoints);
                        //        BD        40        First segment angle (radians)
                        this._writer.WriteBitDouble(mLeaderStyle.FirstSegmentAngleConstraint);
                        //        BD        41        Second segment angle (radians)
                        this._writer.WriteBitDouble(mLeaderStyle.SecondSegmentAngleConstraint);
                        //        BS        173        Leader type (see paragraph on LEADER for more details).
                        this._writer.WriteBitShort((short)mLeaderStyle.PathType);
                        //        CMC        91        Leader line color
                        this._writer.WriteCmColor(mLeaderStyle.LineColor);
                        //        H        340        Leader line type handle (hard pointer)
                        this._writer.HandleReference(DwgReferenceType.HardPointer, mLeaderStyle.LeaderLineType);
                        //        BL        92        Leader line weight
                        this._writer.WriteBitLong((short)mLeaderStyle.LeaderLineWeight);
                        //        B        290        Is landing enabled?
                        this._writer.WriteBit(mLeaderStyle.EnableLanding);
                        //        BD        42        Landing gap
                        this._writer.WriteBitDouble(mLeaderStyle.LandingGap);
                        //        B        291        Auto include landing (is dog-leg enabled?)
                        this._writer.WriteBit(mLeaderStyle.EnableDogleg);
                        //        BD        43        Landing distance
                        this._writer.WriteBitDouble(mLeaderStyle.LandingDistance);
                        //        TV        3        Style description
                        this._writer.WriteVariableText(mLeaderStyle.Description);
                        //        H        341        Arrow head block handle (hard pointer)
                        this._writer.HandleReference(DwgReferenceType.HardPointer, mLeaderStyle.Arrowhead);
                        //        BD        44        Arrow head size
                        this._writer.WriteBitDouble(mLeaderStyle.ArrowheadSize);
                        //        TV        300        Text default
                        this._writer.WriteVariableText(mLeaderStyle.DefaultTextContents);
                        //        H        342        Text style handle (hard pointer)
                        this._writer.HandleReference(DwgReferenceType.HardPointer, mLeaderStyle.TextStyle);
                        //        BS        174        Left attachment (see paragraph on LEADER for more details).
                        this._writer.WriteBitShort((short)mLeaderStyle.TextLeftAttachment);
                        //        BS        178        Right attachment (see paragraph on LEADER for more details).
                        this._writer.WriteBitShort((short)mLeaderStyle.TextRightAttachment);
                        if (R2010Plus)
                        {
                                //        IF IsNewFormat OR DXF file
                                //        BS        175        Text angle type (see paragraph on LEADER for more details).
                                this._writer.WriteBitShort((short)mLeaderStyle.TextAngle);
                                //        END IF IsNewFormat OR DXF file
                        }
                        //        BS        176        Text alignment type
                        this._writer.WriteBitShort((short)mLeaderStyle.TextAlignment);
                        //        CMC        93        Text color
                        this._writer.WriteCmColor(mLeaderStyle.TextColor);
                        //        BD        45        Text height
                        this._writer.WriteBitDouble(mLeaderStyle.TextHeight);
                        //        B        292        Text frame enabled
                        this._writer.WriteBit(mLeaderStyle.TextFrame);
                        if (R2010Plus)
                        {
                                //        IF IsNewFormat OR DXF file
                                //        B        297        Always align text left
                                this._writer.WriteBit(mLeaderStyle.TextAlignAlwaysLeft);
                                //        END IF IsNewFormat OR DXF file
                        }
                        //        BD        46        Align space
                        this._writer.WriteBitDouble(mLeaderStyle.AlignSpace);
                        //        H        343        Block handle (hard pointer)
                        this._writer.HandleReference(DwgReferenceType.HardPointer, mLeaderStyle.BlockContent);
                        //        CMC        94        Block color
                        this._writer.WriteCmColor(mLeaderStyle.BlockContentColor);
                        //        3BD        47,49,140        Block scale vector
                        this._writer.Write3BitDouble(mLeaderStyle.BlockContentScale);
                        //        B        293        Is block scale enabled
                        this._writer.WriteBit(mLeaderStyle.EnableBlockContentScale);
                        //        BD        141        Block rotation (radians)
                        this._writer.WriteBitDouble(mLeaderStyle.BlockContentRotation);
                        //        B        294        Is block rotation enabled
                        this._writer.WriteBit(mLeaderStyle.EnableBlockContentRotation);
                        //        BS        177        Block connection type (0 = MLeader connects to the block extents, 1 = MLeader connects to the block base point)
                        this._writer.WriteBitShort((short)mLeaderStyle.BlockContentConnection);
                        //        BD        142        Scale factor
                        this._writer.WriteBitDouble(mLeaderStyle.ScaleFactor);
                        //        B        295        Property changed, meaning not totally clear
                        //        might be set to true if something changed after loading,
                        //        or might be used to trigger updates in dependent MLeaders.
                        //        sequence seems to be different in DXF
                        this._writer.WriteBit(mLeaderStyle.OverwritePropertyValue);
                        //        B        296        Is annotative?
                        this._writer.WriteBit(mLeaderStyle.IsAnnotative);
                        //        BD        143        Break size
                        this._writer.WriteBitDouble(mLeaderStyle.BreakGapSize);

                        //        BS        271        Attachment direction (see paragraph on LEADER for more details).
                        this._writer.WriteBitShort((short)mLeaderStyle.TextAttachmentDirection);
                        //        BS        273        Top attachment (see paragraph on LEADER for more details).
                        this._writer.WriteBitShort((short)mLeaderStyle.TextBottomAttachment);
                        //        BS        272        Bottom attachment (see paragraph on LEADER for more details).
                        this._writer.WriteBitShort((short)mLeaderStyle.TextTopAttachment);
                }

                private void writePlotSettings(PlotSettings plot)
                {
                        //Common:
                        //Page setup name TV 1 plotsettings page setup name
                        this._writer.WriteVariableText(plot.PageName);
                        //Printer / Config TV 2 plotsettings printer or configuration file
                        this._writer.WriteVariableText(plot.SystemPrinterName);
                        //Plot layout flags BS 70 plotsettings plot layout flag
                        this._writer.WriteBitShort((short)plot.Flags);

                        //Left Margin BD 40 plotsettings left margin in millimeters
                        this._writer.WriteBitDouble(plot.UnprintableMargin.Left);
                        //Bottom Margin BD 41 plotsettings bottom margin in millimeters
                        this._writer.WriteBitDouble(plot.UnprintableMargin.Bottom);
                        //Right Margin BD 42 plotsettings right margin in millimeters
                        this._writer.WriteBitDouble(plot.UnprintableMargin.Right);
                        //Top Margin BD 43 plotsettings top margin in millimeters
                        this._writer.WriteBitDouble(plot.UnprintableMargin.Top);

                        //Paper Width BD 44 plotsettings paper width in millimeters
                        this._writer.WriteBitDouble(plot.PaperWidth);
                        //Paper Height BD 45 plotsettings paper height in millimeters
                        this._writer.WriteBitDouble(plot.PaperHeight);

                        //Paper Size TV 4 plotsettings paper size
                        this._writer.WriteVariableText(plot.PaperSize);

                        //Plot origin 2BD 46,47 plotsettings origin offset in millimeters
                        this._writer.WriteBitDouble(plot.PlotOriginX);
                        this._writer.WriteBitDouble(plot.PlotOriginY);

                        //Paper units BS 72 plotsettings plot paper units
                        this._writer.WriteBitShort((short)plot.PaperUnits);
                        //Plot rotation BS 73 plotsettings plot rotation
                        this._writer.WriteBitShort((short)plot.PaperRotation);
                        //Plot type BS 74 plotsettings plot type
                        this._writer.WriteBitShort((short)plot.PlotType);

                        //Window min 2BD 48,49 plotsettings plot window area lower left
                        this._writer.WriteBitDouble(plot.WindowLowerLeftX);
                        this._writer.WriteBitDouble(plot.WindowLowerLeftY);
                        //Window max 2BD 140,141 plotsettings plot window area upper right
                        this._writer.WriteBitDouble(plot.WindowUpperLeftX);
                        this._writer.WriteBitDouble(plot.WindowUpperLeftY);

                        //R13 - R2000 Only:
                        if (this._version >= ACadVersion.AC1012 && this._version <= ACadVersion.AC1015)
                        {
                                //Plot view name T 6 plotsettings plot view name
                                this._writer.WriteVariableText(plot.PlotViewName);
                        }

                        //Common:
                        //Real world units BD 142 plotsettings numerator of custom print scale
                        this._writer.WriteBitDouble(plot.NumeratorScale);
                        //Drawing units BD 143 plotsettings denominator of custom print scale
                        this._writer.WriteBitDouble(plot.DenominatorScale);
                        //Current style sheet TV 7 plotsettings current style sheet
                        this._writer.WriteVariableText(plot.StyleSheet);
                        //Scale type BS 75 plotsettings standard scale type
                        this._writer.WriteBitShort((short)plot.ScaledFit);
                        //Scale factor BD 147 plotsettings scale factor
                        this._writer.WriteBitDouble(plot.StandardScale);
                        //Paper image origin 2BD 148,149 plotsettings paper image origin
                        this._writer.Write2BitDouble(plot.PaperImageOrigin);

                        //R2004+:
                        if (this.R2004Plus)
                        {
                                //Shade plot mode BS 76
                                this._writer.WriteBitShort((short)plot.ShadePlotMode);
                                //Shade plot res.Level BS 77
                                this._writer.WriteBitShort((short)plot.ShadePlotResolutionMode);
                                //Shade plot custom DPI BS 78
                                this._writer.WriteBitShort(plot.ShadePlotDPI);

                                //6 plot view handle(hard pointer)
                                this._writer.HandleReference(DwgReferenceType.HardPointer, null);
                        }

                        //R2007 +:
                        if (this.R2007Plus)
                        {
                                //Visual Style handle(soft pointer)
                                this._writer.HandleReference(DwgReferenceType.SoftPointer, null);
                        }
                }

                private void writeScale(Scale scale)
                {
                        //BS        70        Unknown(ODA writes 0).
                        this._writer.WriteBitShort(0);
                        //TV        300        Name
                        this._writer.WriteVariableText(scale.Name);
                        //BD        140        Paper units(numerator)
                        this._writer.WriteBitDouble(scale.PaperUnits);
                        //BD        141        Drawing units(denominator, divided by 10).
                        this._writer.WriteBitDouble(scale.DrawingUnits);
                        //B        290        Has unit scale
                        this._writer.WriteBit(scale.IsUnitScale);
                }

                private void writeSortEntitiesTable(SortEntitiesTable sortEntitiesTable)
                {
                        //parenthandle (soft pointer)
                        this._writer.HandleReference(DwgReferenceType.SoftPointer, sortEntitiesTable.BlockOwner);

                        //Common:
                        //Numentries BL number of entries
                        this._writer.WriteBitLong(sortEntitiesTable.Sorters.Count());

                        foreach (var item in sortEntitiesTable.Sorters)
                        {
                                //Sort handle(numentries of these, CODE 0, i.e.part of the main bit stream, not of the handle bit stream!).
                                //The sort handle does not have to point to an entity (but it can).
                                //This is just the handle used for determining the drawing order of the entity specified by the entity handle in the handle bit stream.
                                //When the sortentstable doesn’t have a
                                //mapping from entity handle to sort handle, then the entity’s own handle is used for sorting.
                                this._writer.HandleReference(item.Handle);
                                this._writer.HandleReference(DwgReferenceType.SoftPointer, item.Entity);
                        }
                }

                private void writeXRecord(XRecord xrecord)
                {
                        MemoryStream stream = new MemoryStream();
                        StreamIO ms = new StreamIO(stream);
                        ms.EndianConverter = new LittleEndianConverter();

                        foreach (XRecord.Entry entry in xrecord.Entries)
                        {
                                if (entry.Value == null)
                                {
                                        continue;
                                }

                                ms.Write<short>((short)entry.Code);
                                GroupCodeValueType groupValueType = GroupCodeValue.TransformValue(entry.Code);

                                switch (groupValueType)
                                {
                                        case GroupCodeValueType.Byte:
                                        case GroupCodeValueType.Bool:
                                                ms.Write(Convert.ToByte(entry.Value, System.Globalization.CultureInfo.InvariantCulture));
                                                break;
                                        case GroupCodeValueType.Int16:
                                        case GroupCodeValueType.ExtendedDataInt16:
                                                ms.Write(Convert.ToInt16(entry.Value, System.Globalization.CultureInfo.InvariantCulture));
                                                break;
                                        case GroupCodeValueType.Int32:
                                        case GroupCodeValueType.ExtendedDataInt32:
                                                ms.Write(Convert.ToInt32(entry.Value, System.Globalization.CultureInfo.InvariantCulture));
                                                break;
                                        case GroupCodeValueType.Int64:
                                                ms.Write(Convert.ToInt64(entry.Value, System.Globalization.CultureInfo.InvariantCulture));
                                                break;
                                        case GroupCodeValueType.Double:
                                        case GroupCodeValueType.ExtendedDataDouble:
                                                double d = (entry.Value as double?).Value;
                                                ms.Write<double, LittleEndianConverter>(d);
                                                break;
                                        case GroupCodeValueType.Point3D:
                                                XYZ xyz = (entry.Value as XYZ?).Value;
                                                ms.Write<double, LittleEndianConverter>(xyz.X);
                                                ms.Write<double, LittleEndianConverter>(xyz.Y);
                                                ms.Write<double, LittleEndianConverter>(xyz.Z);
                                                break;
                                        case GroupCodeValueType.Chunk:
                                        case GroupCodeValueType.ExtendedDataChunk:
                                                byte[] array = (byte[])entry.Value;
                                                ms.Write((byte)array.Length);
                                                ms.WriteBytes(array);
                                                break;
                                        case GroupCodeValueType.String:
                                        case GroupCodeValueType.ExtendedDataString:
                                        case GroupCodeValueType.Handle:
                                                string text = (string)entry.Value;

                                                if (this.R2007Plus)
                                                {
                                                        if (string.IsNullOrEmpty(text))
                                                        {
                                                                ms.Write<short, LittleEndianConverter>(0);
                                                                return;
                                                        }

                                                        ms.Write<short, LittleEndianConverter>((short)text.Length);
                                                        ms.Write(text, System.Text.Encoding.Unicode);
                                                }
                                                else if (string.IsNullOrEmpty(text))
                                                {
                                                        ms.Write<short, LittleEndianConverter>(0);
                                                        ms.Write((byte)this._writer.Encoding.CodePage);
                                                }
                                                else
                                                {
                                                        ms.Write<short, LittleEndianConverter>((short)text.Length);
                                                        ms.Write((byte)this._writer.Encoding.CodePage);
                                                        ms.Write(text, this._writer.Encoding);
                                                }
                                                break;
                                        case GroupCodeValueType.ObjectId:
                                        case GroupCodeValueType.ExtendedDataHandle:
                                                ulong u = (entry.Value as ulong?).Value;
                                                ms.Write<ulong, LittleEndianConverter>(u);
                                                break;
                                        default:
                                                throw new NotSupportedException();
                                }
                        }

                        //Common:
                        //Numdatabytes BL number of databytes
                        this._writer.WriteBitLong((int)ms.Length);
                        this._writer.WriteBytes(stream.GetBuffer());

                        //R2000+:
                        if (this.R2000Plus)
                        {
                                //Cloning flag BS 280
                                this._writer.WriteBitShort((short)xrecord.CloningFlags);
                        }

                }
        }
}

DomCR / ACadSharp / 12008475829

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