public static void ModifyingXData()
{
Line line = new Line(Vector2.Zero, Vector2.UnitX);
ApplicationRegistry appReg = new ApplicationRegistry("netDxf");
XData xdata = new XData(appReg);
xdata.XDataRecord.Add(new XDataRecord(XDataCode.String, "Length"));
line.XData.Add(xdata);
DxfDocument doc = new DxfDocument();
doc.AddEntity(line);
// modifying existing extended data
line.XData[appReg.Name].XDataRecord.Add(new XDataRecord(XDataCode.Real, Vector3.Distance(line.StartPoint, line.EndPoint)));
// adding new extended data entry to an existing entity
ApplicationRegistry appReg2 = new ApplicationRegistry("newXData");
XData xdata2 = new XData(appReg2);
xdata2.XDataRecord.Add(new XDataRecord(XDataCode.String, "XData entries"));
line.XData.Add(xdata2);
Debug.Assert(ReferenceEquals(line.XData[appReg2.Name].ApplicationRegistry, doc.ApplicationRegistries[appReg2.Name]));
// deleting existing extended data
line.XData.Remove(appReg.Name);
// we can also change the name of the application registry name
doc.ApplicationRegistries["newXData"].Name = "netDxfRenamed";
doc.Save("xData.dxf");
doc = DxfDocument.Load("xData.dxf");
}
protected virtual void OnXDataRemoveAppRegEvent(ApplicationRegistry item)
{
XDataRemoveAppRegEventHandler ae = this.XDataRemoveAppReg;
if (ae != null)
{
ae(this, new ObservableCollectionEventArgs <ApplicationRegistry>(item));
}
}
/// <summary>
/// Creates a new ApplicationRegistry that is a copy of the current instance.
/// </summary>
/// <param name="newName">ApplicationRegistry name of the copy.</param>
/// <returns>A new ApplicationRegistry that is a copy of this instance.</returns>
public override TableObject Clone(string newName)
{
ApplicationRegistry copy = new ApplicationRegistry(newName);
foreach (XData data in this.XData.Values)
{
copy.XData.Add((XData)data.Clone());
}
return(copy);
}
/// <summary>
/// Initialize a new instance of the <c>XData</c> class .
/// </summary>
/// <param name="appReg">Name of the application associated with the list of extended data records.</param>
public XData(ApplicationRegistry appReg)
{
this.appReg = appReg;
this.xData = new List<XDataRecord>();
}
protected virtual void OnXDataRemoveAppRegEvent(ApplicationRegistry item)
{
XDataRemoveAppRegEventHandler ae = this.XDataRemoveAppReg;
if (ae != null)
ae(this, new ObservableCollectionEventArgs<ApplicationRegistry>(item));
}
/// <summary>
/// Writes a new extended data application registry to the table section.
/// </summary>
/// <param name="appReg">Name of the application registry.</param>
private void WriteApplicationRegistry(ApplicationRegistry appReg)
{
Debug.Assert(this.activeTable == DxfObjectCode.ApplicationIDTable);
this.chunk.Write(0, DxfObjectCode.ApplicationIDTable);
this.chunk.Write(5, appReg.Handle);
this.chunk.Write(330, appReg.Owner.Handle);
this.chunk.Write(100, SubclassMarker.TableRecord);
this.chunk.Write(100, SubclassMarker.ApplicationId);
this.chunk.Write(2, this.EncodeNonAsciiCharacters(appReg.Name));
this.chunk.Write(70, (short) 0);
}
/// <summary>
/// Determines whether the specified <see cref="netDxf.Tables.ApplicationRegistry" /> is equal to the current <see cref="netDxf.Tables.ApplicationRegistry" />.
/// </summary>
/// <returns>
/// True if the specified <see cref="netDxf.Tables.ApplicationRegistry" /> is equal to the current <see cref="netDxf.Tables.ApplicationRegistry" />; otherwise, false.
/// </returns>
/// <remarks>Two <see cref="netDxf.Tables.ApplicationRegistry" /> instances are equal if their names are equal.</remarks>
/// <exception cref="T:System.NullReferenceException">
/// The <paramref name="obj" /> parameter is null.
/// </exception>
public bool Equals(ApplicationRegistry obj)
{
return(obj.name == this.name);
}
/// <summary>
/// Writes a new extended data application registry to the table section.
/// </summary>
/// <param name="appReg">Nombre del registro de aplicación.</param>
public void RegisterApplication(ApplicationRegistry appReg)
{
if (this.activeTable != StringCode.ApplicationIDTable)
{
throw new InvalidDxfTableException(StringCode.ApplicationIDTable, this.file);
}
this.WriteCodePair(0, StringCode.ApplicationIDTable);
this.WriteCodePair(5, appReg.Handle);
this.WriteCodePair(100, SubclassMarker.TableRecord);
this.WriteCodePair(100, SubclassMarker.ApplicationId);
this.WriteCodePair(2, appReg);
this.WriteCodePair(70, 0);
}
private XData ReadXDataRecord(ApplicationRegistry appReg)
{
XData xData = new XData(appReg);
this.chunk.Next();
while (this.chunk.Code >= 1000 && this.chunk.Code <= 1071)
{
if (this.chunk.Code == (short) XDataCode.AppReg)
break;
XDataCode code = (XDataCode) this.chunk.Code;
object value = null;
switch (code)
{
case XDataCode.String:
value = this.DecodeEncodedNonAsciiCharacters(this.chunk.ReadString());
break;
case XDataCode.AppReg:
// Application name cannot appear inside the extended data, AutoCAD assumes it is the beginning of a new application extended data group
break;
case XDataCode.ControlString:
value = this.chunk.ReadString();
break;
case XDataCode.LayerName:
value = this.DecodeEncodedNonAsciiCharacters(this.chunk.ReadString());
break;
case XDataCode.BinaryData:
value = this.chunk.ReadBytes();
break;
case XDataCode.DatabaseHandle:
value = this.chunk.ReadString();
break;
case XDataCode.RealX:
case XDataCode.RealY:
case XDataCode.RealZ:
case XDataCode.WorldSpacePositionX:
case XDataCode.WorldSpacePositionY:
case XDataCode.WorldSpacePositionZ:
case XDataCode.WorldSpaceDisplacementX:
case XDataCode.WorldSpaceDisplacementY:
case XDataCode.WorldSpaceDisplacementZ:
case XDataCode.WorldDirectionX:
case XDataCode.WorldDirectionY:
case XDataCode.WorldDirectionZ:
case XDataCode.Real:
case XDataCode.Distance:
case XDataCode.ScaleFactor:
value = this.chunk.ReadDouble();
break;
case XDataCode.Int16:
value = this.chunk.ReadShort();
break;
case XDataCode.Int32:
value = this.chunk.ReadInt();
break;
}
XDataRecord xDataRecord = new XDataRecord(code, value);
xData.XDataRecord.Add(xDataRecord);
this.chunk.Next();
}
return xData;
}
/// <summary>
/// Determines whether the specified <see cref="netDxf.Tables.ApplicationRegistry" /> is equal to the current <see cref="netDxf.Tables.ApplicationRegistry" />.
/// </summary>
/// <returns>
/// True if the specified <see cref="netDxf.Tables.ApplicationRegistry" /> is equal to the current <see cref="netDxf.Tables.ApplicationRegistry" />; otherwise, false.
/// </returns>
/// <remarks>Two <see cref="netDxf.Tables.ApplicationRegistry" /> instances are equal if their names are equal.</remarks>
/// <exception cref="T:System.NullReferenceException">
/// The <paramref name="obj" /> parameter is null.
/// </exception>
public bool Equals(ApplicationRegistry obj)
{
return obj.name == this.name;
}
private static void AppRegUsesAndRemove()
{
DxfDocument dxf = new DxfDocument();
List<PolylineVertex> vertexes = new List<PolylineVertex>{
new PolylineVertex(0, 0, 0),
new PolylineVertex(10, 0, 10),
new PolylineVertex(10, 10, 20),
new PolylineVertex(0, 10, 30)
};
Polyline poly = new Polyline(vertexes, true);
XData xdata1 = new XData(new ApplicationRegistry("netDxf"));
xdata1.XDataRecord.Add(new XDataRecord(XDataCode.String, "extended data with netDxf"));
poly.XData.Add(xdata1);
dxf.AddEntity(poly);
Line line = new Line(new Vector2(10, 5), new Vector2(-10, -5));
ApplicationRegistry myAppReg = new ApplicationRegistry("MyAppReg");
XData xdata2 = new XData(myAppReg);
xdata2.XDataRecord.Add(new XDataRecord(XDataCode.Distance, Vector3.Distance(line.StartPoint, line.EndPoint)));
line.XData.Add(xdata2);
dxf.AddEntity(line);
Circle circle = new Circle(Vector3.Zero, 15);
XData xdata3 = new XData(myAppReg);
xdata3.XDataRecord.Add(new XDataRecord(XDataCode.Real, circle.Radius));
circle.XData.Add(xdata3);
dxf.AddEntity(circle);
dxf.Save("appreg.dxf");
DxfDocument dxf2 = DxfDocument.Load("appreg.dxf");
// will return false the "MyAppReg" is in use
bool ok;
ok = dxf.ApplicationRegistries.Remove(myAppReg.Name);
dxf.RemoveEntity(line);
dxf.RemoveEntity(circle);
// "MyAppReg" is not used anymore
IList<DxfObject> uses = dxf.ApplicationRegistries.GetReferences(myAppReg.Name);
// it is safe to delete it
ok = dxf.ApplicationRegistries.Remove(myAppReg.Name);
// we can even make a full cleanup
dxf.ApplicationRegistries.Clear();
dxf.Save("appreg2.dxf");
}
private static void BinaryChunkXData()
{
Line line = new Line(Vector2.Zero, Vector2.UnitX);
ApplicationRegistry appId = new ApplicationRegistry("TestBinaryChunk");
// the extended data binary data (code 1004) is stored in a different way depending if the dxf file is text or binary.
// in text based files as a string of hexadecimal digits, two per binary byte,
// while in binary files the data is stored in chunks of 127 bytes, preceding a byte that defines the number of bytes in the chunk
byte[] data = new byte[325];
// fill up the array with some random data
Random rnd = new Random();
rnd.NextBytes(data);
XData xdata = new XData(appId);
// the XDataRecord will store the binary data as a byte array and not as a string as it use to be
xdata.XDataRecord.Add(new XDataRecord(XDataCode.BinaryData, data));
line.XData.Add(xdata);
DxfDocument dxf = new DxfDocument();
dxf.AddEntity(line);
dxf.Save("BinaryChunkXData.dxf");
dxf.Save("BinaryChunkXData binary.dxf", true);
// some testing
DxfDocument test = DxfDocument.Load("BinaryChunkXData binary.dxf");
Line lineTest = test.Lines[0];
XDataRecord recordTest = lineTest.XData[appId.Name].XDataRecord[0];
Debug.Assert(recordTest.Code == XDataCode.BinaryData);
byte[] dataText = (byte[]) recordTest.Value;
byte[] compare = new byte[127];
Array.Copy(data, compare, 127);
for (int i = 0; i < 127; i++)
{
Console.WriteLine(dataText[i] == compare[i]);
}
// this is the string as it is saved in text based dxf files
StringBuilder sb = new StringBuilder();
for (int i = 0; i < dataText.Length; i++)
{
sb.Append(String.Format("{0:X2}", data[i]));
}
Console.WriteLine(sb.ToString());
Console.WriteLine();
Console.WriteLine("Press a key to continue...");
Console.ReadKey();
}
static ApplicationRegistry()
{
defaultApp = new ApplicationRegistry("ACAD");
}