private static void LwPolyline()
{
DxfDocument dxf = new DxfDocument();
LwPolyline poly = new LwPolyline();
poly.Vertexes.Add(new LwPolylineVertex(0, 0));
poly.Vertexes.Add(new LwPolylineVertex(10, 10));
poly.Vertexes.Add(new LwPolylineVertex(20, 0));
poly.Vertexes.Add(new LwPolylineVertex(30, 10));
poly.SetConstantWidth(2);
//poly.IsClosed = true;
dxf.AddEntity(poly);
dxf.Save("lwpolyline.dxf");
dxf = DxfDocument.Load("lwpolyline.dxf");
}
private LwPolyline ReadLwPolyline()
{
double elevation = 0.0;
double thickness = 0.0;
PolylinetypeFlags flags = PolylinetypeFlags.OpenPolyline;
double constantWidth = -1.0;
List<LwPolylineVertex> polVertexes = new List<LwPolylineVertex>();
LwPolylineVertex v = null;
double vX = 0.0;
Vector3 normal = Vector3.UnitZ;
List<XData> xData = new List<XData>();
this.chunk.Next();
while (this.chunk.Code != 0)
{
switch (this.chunk.Code)
{
case 38:
elevation = this.chunk.ReadDouble();
this.chunk.Next();
break;
case 39:
thickness = this.chunk.ReadDouble();
this.chunk.Next();
break;
case 43:
// constant width (optional; default = 0). If present it will override any vertex width (codes 40 and/or 41)
constantWidth = this.chunk.ReadDouble();
this.chunk.Next();
break;
case 70:
flags = (PolylinetypeFlags) this.chunk.ReadShort();
this.chunk.Next();
break;
case 90:
//numVertexes = int.Parse(code.Value);
this.chunk.Next();
break;
case 10:
vX = this.chunk.ReadDouble();
this.chunk.Next();
break;
case 20:
double vY = this.chunk.ReadDouble();
v = new LwPolylineVertex(vX, vY);
polVertexes.Add(v);
this.chunk.Next();
break;
case 40:
double startWidth = this.chunk.ReadDouble();
if (v != null)
if (startWidth >= 0.0)
v.StartWidth = startWidth;
this.chunk.Next();
break;
case 41:
double endWidth = this.chunk.ReadDouble();
if (v != null)
if (endWidth >= 0.0)
v.EndWidth = endWidth;
this.chunk.Next();
break;
case 42:
if (v != null)
v.Bulge = this.chunk.ReadDouble();
this.chunk.Next();
break;
case 210:
normal.X = this.chunk.ReadDouble();
this.chunk.Next();
break;
case 220:
normal.Y = this.chunk.ReadDouble();
this.chunk.Next();
break;
case 230:
normal.Z = this.chunk.ReadDouble();
this.chunk.Next();
break;
case 1001:
string appId = this.DecodeEncodedNonAsciiCharacters(this.chunk.ReadString());
XData data = this.ReadXDataRecord(this.GetApplicationRegistry(appId));
xData.Add(data);
break;
default:
if (this.chunk.Code >= 1000 && this.chunk.Code <= 1071)
throw new Exception("The extended data of an entity must start with the application registry code.");
this.chunk.Next();
break;
}
}
LwPolyline entity = new LwPolyline
{
Elevation = elevation,
Thickness = thickness,
Flags = flags,
Normal = normal
};
entity.Vertexes.AddRange(polVertexes);
if (constantWidth >= 0.0)
entity.SetConstantWidth(constantWidth);
entity.XData.AddRange(xData);
return entity;
}
private static void LineWidth()
{
// the line thickness works as expected, according to the AutoCAD way of doing things
Line thickLine = new Line(new Vector3(0,10,0), new Vector3(10,20,0));
// when you assign a thickness to a line, the result is like a wall, it is like a 3d face whose vertexes are defined by the
// start and end points of the line and the thickness along the normal of the line.
thickLine.Thickness = 5;
// maybe what you are trying to do is create a line with a width (something that we can read it as a line with thickness), the only way to do this is to create a polyline
// the kind of result you will get if you give a width to a 2d polyline
// you can only give a width to a vertex of a Polyline or a LightweigthPolyline
// I am planning to drop support to AutoCAD 12 dxf files, so to define a bidimensional polyline the only way will be to use lightweight polyline
// (the Polyline class and the LightWeightPolyline are basically the same).
LwPolyline widthLine = new LwPolyline();
LwPolylineVertex startVertex = new LwPolylineVertex(new Vector2(0, 0));
LwPolylineVertex endVertex = new LwPolylineVertex(new Vector2(10, 10));
widthLine.Vertexes.AddRange(new[] { startVertex, endVertex });
// the easy way to give a constant width to a polyline, but you can also give a polyline width by vertex
// there is a mistake on my part, following the AutoCAD documentation I should have called the PolylineVertex.StartThickness and PolylineVertex.EndThickness as
// PolylineVertex.StartWidth and PolylineVertex.EndWidth
// SetConstantWidth is a sort cut that will assign the given value to every start width and end width of every vertex of the polyline
widthLine.SetConstantWidth(0.5);
DxfDocument dxf = new DxfDocument();
// add the entities to the document (both of them to see the difference)
dxf.AddEntity(thickLine);
dxf.AddEntity(widthLine);
dxf.Save("line width.dxf");
}
