public static uint AssignHandles(DxfFile file)
{
var visitedItems = new HashSet <IDxfItemInternal>();
foreach (var item in file.GetFileItems())
{
ClearPointers(item, visitedItems);
}
visitedItems.Clear();
uint nextPointer = 1u;
foreach (var item in file.GetFileItems().Where(i => i != null))
{
nextPointer = AssignHandles(item, nextPointer, 0u, visitedItems);
foreach (var child in item.GetChildItems().Where(c => c != null))
{
nextPointer = AssignHandles(child, nextPointer, item.Handle, visitedItems);
child.SetOwner(item);
}
}
return(nextPointer);
}
public static DxfHandle AssignHandles(DxfFile file)
{
var visitedItems = new HashSet <IDxfItemInternal>();
foreach (var item in file.GetFileItems())
{
ClearPointers(item, visitedItems);
}
visitedItems.Clear();
var nextPointer = new DxfHandle(1);
foreach (var item in file.GetFileItems().Where(i => i != null))
{
nextPointer = AssignHandles(item, nextPointer, default(DxfHandle), visitedItems);
foreach (var child in item.GetChildItems().Where(c => c != null))
{
var parentHandle = GetParentHandle(item, child);
nextPointer = AssignHandles(child, nextPointer, parentHandle, visitedItems);
SetOwner(child, item, isWriting: true);
}
}
return(nextPointer);
}
public void Save(DxfFile file)
{
// write sentinel "AutoCAD DXB 1.0 CR LF ^Z NUL"
foreach (var c in DxbReader.BinarySentinel)
{
_writer.Write((byte)c);
}
_writer.Write((byte)'\r'); // CR
_writer.Write((byte)'\n'); // LF
_writer.Write((byte)0x1A); // ^Z
_writer.Write((byte)0x00);
var writingBlock = file.Entities.Count == 0 && file.Blocks.Count == 1;
if (writingBlock)
{
// write block header
WriteItemType(DxbItemType.BlockBase);
var block = file.Blocks.Single();
WriteN((float)block.BasePoint.X);
WriteN((float)block.BasePoint.Y);
}
// force all numbers to be floats
WriteItemType(DxbItemType.NumberMode);
WriteW(1);
if (writingBlock)
{
WriteEntities(file.Blocks.Single().Entities);
}
else
{
var layerGroups = file.Entities.GroupBy(e => e.Layer).OrderBy(g => g.Key);
foreach (var group in layerGroups)
{
var layerName = group.Key;
WriteItemType(DxbItemType.NewLayer);
foreach (var c in layerName)
{
_writer.Write((byte)c);
}
_writer.Write((byte)0.00); // null terminator for string
WriteEntities(group);
}
}
// write null terminator
_writer.Write((byte)0x00);
_writer.Flush();
}
public void Save(DxfFile file)
{
// write sentinel "AutoCAD DXB 1.0 CR LF ^Z NUL"
foreach (var c in DxbReader.BinarySentinel)
{
_writer.Write((byte)c);
}
_writer.Write((byte)'\r'); // CR
_writer.Write((byte)'\n'); // LF
_writer.Write((byte)0x1A); // ^Z
_writer.Write((byte)0x00);
var writingBlock = file.Entities.Count == 0 && file.Blocks.Count == 1;
if (writingBlock)
{
// write block header
WriteItemType(DxbItemType.BlockBase);
var block = file.Blocks.Single();
WriteN((float)block.BasePoint.X);
WriteN((float)block.BasePoint.Y);
}
// force all numbers to be floats
WriteItemType(DxbItemType.NumberMode);
WriteW(1);
if (writingBlock)
{
WriteEntities(file.Blocks.Single().Entities);
}
else
{
var layerGroups = file.Entities.GroupBy(e => e.Layer).OrderBy(g => g.Key);
foreach (var group in layerGroups)
{
var layerName = group.Key;
WriteItemType(DxbItemType.NewLayer);
foreach (var c in layerName)
{
_writer.Write((byte)c);
}
_writer.Write((byte)0.00); // null terminator for string
WriteEntities(group);
}
}
// write null terminator
_writer.Write((byte)0x00);
_writer.Flush();
}
public static void BindPointers(DxfFile file)
{
// gather all items by handle
var handleMap = new Dictionary <uint, IDxfItemInternal>();
var visitedItems = new HashSet <IDxfItemInternal>();
foreach (var item in file.GetFileItems())
{
GatherPointers(item, handleMap, visitedItems);
}
visitedItems.Clear();
var visitedChildren = new HashSet <IDxfItemInternal>();
// bind all pointers
foreach (var item in file.GetFileItems())
{
BindPointers(item, handleMap, visitedItems, visitedChildren);
}
}
internal static DxfFile LoadFromReader(IDxfCodePairReader reader)
{
var file = new DxfFile();
file.Clear();
var buffer = new DxfCodePairBufferReader(reader);
var version = DxfAcadVersion.R14;
while (buffer.ItemsRemain)
{
var pair = buffer.Peek();
if (DxfCodePair.IsSectionStart(pair))
{
buffer.Advance(); // swallow (0, SECTION) pair
var section = DxfSection.FromBuffer(buffer, file, version);
if (section != null)
{
switch (section.Type)
{
case DxfSectionType.Blocks:
file.BlocksSection = (DxfBlocksSection)section;
break;
case DxfSectionType.Entities:
file.EntitiesSection = (DxfEntitiesSection)section;
break;
case DxfSectionType.Classes:
file.ClassSection = (DxfClassesSection)section;
break;
case DxfSectionType.Header:
file.HeaderSection = (DxfHeaderSection)section;
version = file.Header.Version;
break;
case DxfSectionType.Objects:
file.ObjectsSection = (DxfObjectsSection)section;
break;
case DxfSectionType.Tables:
file.TablesSection = (DxfTablesSection)section;
break;
case DxfSectionType.Thumbnail:
file.ThumbnailImageSection = (DxfThumbnailImageSection)section;
break;
}
}
}
else if (DxfCodePair.IsEof(pair))
{
// swallow and quit
buffer.Advance();
break;
}
else if (DxfCodePair.IsComment(pair))
{
// swallow comments
buffer.Advance();
}
else
{
// swallow unexpected code pair
buffer.Advance();
}
}
Debug.Assert(!buffer.ItemsRemain);
DxfPointer.BindPointers(file);
return(file);
}
public DxfFile ReadFile(BinaryReader reader)
{
// swallow next two characters
var sub = reader.ReadChar();
Debug.Assert(sub == 0x1A);
var nul = reader.ReadChar();
Debug.Assert(nul == 0x00);
DxfPoint?blockBase = null;
var entities = new List <DxfEntity>();
var stillReading = true;
Action <Func <BinaryReader, DxfEntity> > addEntity = (entityReader) =>
{
var entity = entityReader(reader);
AssignCommonValues(entity);
entities.Add(entity);
};
Func <DxfVertex> getLastVertex = () => entities.LastOrDefault() as DxfVertex;
while (stillReading)
{
var itemType = (DxbItemType)reader.ReadByte();
switch (itemType)
{
case DxbItemType.Line:
addEntity(ReadLine);
break;
case DxbItemType.Point:
addEntity(ReadPoint);
break;
case DxbItemType.Circle:
addEntity(ReadCircle);
break;
case DxbItemType.Arc:
addEntity(ReadArc);
break;
case DxbItemType.Trace:
addEntity(ReadTrace);
break;
case DxbItemType.Solid:
addEntity(ReadSolid);
break;
case DxbItemType.Seqend:
addEntity(ReadSeqend);
break;
case DxbItemType.Polyline:
addEntity(ReadPolyline);
break;
case DxbItemType.Vertex:
addEntity(ReadVertex);
break;
case DxbItemType.Face:
addEntity(ReadFace);
break;
case DxbItemType.ScaleFactor:
_scaleFactor = ReadF(reader);
break;
case DxbItemType.NewLayer:
var sb = new StringBuilder();
for (int b = reader.ReadByte(); b != 0; b = reader.ReadByte())
{
sb.Append((char)b);
}
_layerName = sb.ToString();
break;
case DxbItemType.LineExtension:
addEntity(ReadLineExtension);
break;
case DxbItemType.TraceExtension:
addEntity(ReadTraceExtension);
break;
case DxbItemType.BlockBase:
var x = ReadN(reader);
var y = ReadN(reader);
if (blockBase == null && entities.Count == 0)
{
// only if this is the first item encountered
blockBase = new DxfPoint(x, y, 0.0);
}
break;
case DxbItemType.Bulge:
{
var bulge = ReadU(reader);
var lastVertex = getLastVertex();
if (lastVertex != null)
{
lastVertex.Bulge = bulge;
}
}
break;
case DxbItemType.Width:
{
var startWidth = ReadN(reader);
var endWidth = ReadN(reader);
var lastVertex = getLastVertex();
if (lastVertex != null)
{
lastVertex.StartingWidth = startWidth;
lastVertex.EndingWidth = endWidth;
}
}
break;
case DxbItemType.NumberMode:
_isIntegerMode = ReadW(reader) == 0;
break;
case DxbItemType.NewColor:
_color = DxfColor.FromRawValue((short)ReadW(reader));
break;
case DxbItemType.LineExtension3D:
addEntity(ReadLineExtension3D);
break;
case 0:
stillReading = false;
break;
}
}
var file = new DxfFile();
foreach (var section in file.Sections)
{
section.Clear();
}
// collect the entities (e.g., polylines, etc.)
entities = DxfEntitiesSection.GatherEntities(entities);
if (blockBase != null)
{
// entities are all contained in a block
var block = new DxfBlock();
block.BasePoint = blockBase.GetValueOrDefault();
foreach (var entity in entities)
{
block.Entities.Add(entity);
}
file.Blocks.Add(block);
}
else
{
// just a normal collection of entities
foreach (var entity in entities)
{
file.Entities.Add(entity);
}
}
return(file);
}
private static DxfFile LoadFromReader(IDxfCodePairReader reader)
{
var file = new DxfFile();
file.Clear();
var buffer = new DxfCodePairBufferReader(reader.GetCodePairs());
var version = DxfAcadVersion.R14;
while (buffer.ItemsRemain)
{
var pair = buffer.Peek();
if (DxfCodePair.IsSectionStart(pair))
{
buffer.Advance(); // swallow (0, SECTION) pair
var section = DxfSection.FromBuffer(buffer, version);
if (section != null)
{
switch (section.Type)
{
case DxfSectionType.Blocks:
file.BlocksSection = (DxfBlocksSection)section;
break;
case DxfSectionType.Entities:
file.EntitiesSection = (DxfEntitiesSection)section;
break;
case DxfSectionType.Classes:
file.ClassSection = (DxfClassesSection)section;
break;
case DxfSectionType.Header:
file.HeaderSection = (DxfHeaderSection)section;
version = file.Header.Version;
break;
case DxfSectionType.Objects:
file.ObjectsSection = (DxfObjectsSection)section;
break;
case DxfSectionType.Tables:
file.TablesSection = (DxfTablesSection)section;
break;
case DxfSectionType.Thumbnail:
file.ThumbnailImageSection = (DxfThumbnailImageSection)section;
break;
}
}
}
else if (DxfCodePair.IsEof(pair))
{
// swallow and quit
buffer.Advance();
break;
}
else if (DxfCodePair.IsComment(pair))
{
// swallow comments
buffer.Advance();
}
else
{
// swallow unexpected code pair
buffer.Advance();
}
}
Debug.Assert(!buffer.ItemsRemain);
DxfPointer.BindPointers(file);
return file;
}
public DxfFile ReadFile(BinaryReader reader)
{
// swallow next two characters
var sub = reader.ReadChar();
Debug.Assert(sub == 0x1A);
var nul = reader.ReadChar();
Debug.Assert(nul == 0x00);
DxfPoint blockBase = null;
var entities = new List<DxfEntity>();
var stillReading = true;
Action<Func<BinaryReader, DxfEntity>> addEntity = (entityReader) =>
{
var entity = entityReader(reader);
AssignCommonValues(entity);
entities.Add(entity);
};
Func<DxfVertex> getLastVertex = () => entities.LastOrDefault() as DxfVertex;
while (stillReading)
{
var itemType = (DxbItemType)reader.ReadByte();
switch (itemType)
{
case DxbItemType.Line:
addEntity(ReadLine);
break;
case DxbItemType.Point:
addEntity(ReadPoint);
break;
case DxbItemType.Circle:
addEntity(ReadCircle);
break;
case DxbItemType.Arc:
addEntity(ReadArc);
break;
case DxbItemType.Trace:
addEntity(ReadTrace);
break;
case DxbItemType.Solid:
addEntity(ReadSolid);
break;
case DxbItemType.Seqend:
addEntity(ReadSeqend);
break;
case DxbItemType.Polyline:
addEntity(ReadPolyline);
break;
case DxbItemType.Vertex:
addEntity(ReadVertex);
break;
case DxbItemType.Face:
addEntity(ReadFace);
break;
case DxbItemType.ScaleFactor:
_scaleFactor = ReadF(reader);
break;
case DxbItemType.NewLayer:
var sb = new StringBuilder();
for (int b = reader.ReadByte(); b != 0; b = reader.ReadByte())
sb.Append((char)b);
_layerName = sb.ToString();
break;
case DxbItemType.LineExtension:
addEntity(ReadLineExtension);
break;
case DxbItemType.TraceExtension:
addEntity(ReadTraceExtension);
break;
case DxbItemType.BlockBase:
var x = ReadN(reader);
var y = ReadN(reader);
if (blockBase == null && entities.Count == 0)
{
// only if this is the first item encountered
blockBase = new DxfPoint(x, y, 0.0);
}
break;
case DxbItemType.Bulge:
{
var bulge = ReadU(reader);
var lastVertex = getLastVertex();
if (lastVertex != null)
{
lastVertex.Bulge = bulge;
}
}
break;
case DxbItemType.Width:
{
var startWidth = ReadN(reader);
var endWidth = ReadN(reader);
var lastVertex = getLastVertex();
if (lastVertex != null)
{
lastVertex.StartingWidth = startWidth;
lastVertex.EndingWidth = endWidth;
}
}
break;
case DxbItemType.NumberMode:
_isIntegerMode = ReadW(reader) == 0;
break;
case DxbItemType.NewColor:
_color = DxfColor.FromRawValue((short)ReadW(reader));
break;
case DxbItemType.LineExtension3D:
addEntity(ReadLineExtension3D);
break;
case 0:
stillReading = false;
break;
}
}
var file = new DxfFile();
// collect the entities (e.g., polylines, etc.)
entities = DxfEntitiesSection.GatherEntities(entities);
if (blockBase != null)
{
// entities are all contained in a block
var block = new DxfBlock();
block.BasePoint = blockBase;
block.Entities.AddRange(entities);
file.Blocks.Add(block);
}
else
{
// just a normal collection of entities
file.Entities.AddRange(entities);
}
return file;
}
