/// <summary>
/// Tesselates the specified path, notifying the
/// <see cref="UMD.HCIL.PiccoloDirect3D.Util.TesselationVisitor">TesselationVisitor</see>
/// as each new triangle primitive is added.
/// </summary>
/// <param name="path">The path to tesselate.</param>
/// <param name="visitor">The tesselation visitor to notify.</param>
public virtual void Tesselate(GraphicsPath path, TesselationVisitor visitor)
{
this.visitor = visitor;
switch (path.FillMode)
{
case FillMode.Alternate: //even/odd
P3Util.SetWindingRule(tess, P3Util.GlTessWinding.WindingOdd);
break;
case FillMode.Winding: //nonzero
P3Util.SetWindingRule(tess, P3Util.GlTessWinding.WindingNonzero);
break;
}
P3Util.GluTessBeginPolygon(tess, IntPtr.Zero);
bool isClosed;
GraphicsPathIterator pi = new GraphicsPathIterator(path);
PointF[] points = path.PathPoints;
while (pi.NextSubpath(path, out isClosed) != 0)
{
byte type;
int start, end;
while (pi.NextPathType(out type, out start, out end) != 0)
{
PathPointType ppType = (PathPointType)type;
P3Util.GluTessBeginContour(tess);
for (int i = start; i <= end; i++)
{
PointF point = points[i];
double[] coords = new double[3];
coords[0] = point.X;
coords[1] = point.Y;
coords[2] = 0;
GCHandle handle = GCHandle.Alloc(coords, GCHandleType.Pinned);
P3Util.GluTessVertex(tess, coords, (IntPtr)handle);
handles.Add(handle);
}
P3Util.GluTessEndContour(tess);
}
}
P3Util.GluTessEndPolygon(tess);
ClearHandles();
}
/// <summary>
/// Constructs a new Tesselator object.
/// </summary>
public Tesselator()
{
tess = P3Util.GluNewTess();
vertexCallback = new P3Util.VertexCallback(TessVertex);
beginCallback = new P3Util.BeginCallback(TessBegin);
endCallback = new P3Util.EndCallback(TessEnd);
errorCallback = new P3Util.ErrorCallback(TessError);
combineCallback = new P3Util.CombineCallback(TessCombine);
P3Util.GluTessVertexCallBack(tess, P3Util.GlCallbackName.Vertex, vertexCallback);
P3Util.GluTessBeginCallBack(tess, P3Util.GlCallbackName.Begin, beginCallback);
P3Util.GluTessEndCallBack(tess, P3Util.GlCallbackName.End, endCallback);
P3Util.GluTessErrorCallBack(tess, P3Util.GlCallbackName.Error, errorCallback);
P3Util.GluTessCombineCallBack(tess, P3Util.GlCallbackName.Combine, combineCallback);
P3Util.GluTessNormal(tess, 0f, 0f, -1f);
}
/// <summary>
/// Notifies the <see cref="UMD.HCIL.PiccoloDirect3D.Util.TesselationVisitor">
/// TesselationVisitor</see> when an error is encountered.
/// </summary>
/// <param name="error">The type of error that occured.</param>
public virtual void TessError(P3Util.GlTessError error) {
visitor.TessError(error);
}
/// <summary>
/// Notifies the <see cref="UMD.HCIL.PiccoloDirect3D.Util.TesselationVisitor">
/// TesselationVisitor</see> of the start of a (triangle) primitive.
/// </summary>
/// <param name="which">The type of the primitive.</param>
public virtual void TessBegin(P3Util.GlPrimitiveType which) {
visitor.TessBegin(which);
}
/// <summary>
/// Disposes the tesselation object.
/// </summary>
public virtual void Dispose()
{
P3Util.GluDeleteTess(tess);
}
/// <summary>
/// Implements <see cref="UMD.HCIL.PiccoloDirect3D.Util.TesselationVisitor.TessError">
/// TesselationVisitor.TessError</see>.
/// </summary>
public virtual void TessError(P3Util.GlTessError error) {
System.Console.Error.WriteLine("Glu tesselation error: " + error);
}
/// <summary>
/// Implements <see cref="UMD.HCIL.PiccoloDirect3D.Util.TesselationVisitor.TessBegin">
/// TesselationVisitor.TessBegin</see>.
/// </summary>
public virtual void TessBegin(P3Util.GlPrimitiveType which) {
PrimitiveType type = P3Util.GetD3DPrimitiveType(which);
this.renderListTypes.Add(new PrimitiveTypeInfo(renderList.Count, renderList.Count-1, currentTesselationColor, type));
}
