private static Tristrip gpc_strip_ToTristrip(gpc_tristrip gpc_strip)
{
Tristrip tristrip = new Tristrip();
tristrip.NofStrips = gpc_strip.num_strips;
tristrip.Strip = new VertexList[tristrip.NofStrips];
IntPtr ptr = gpc_strip.strip;
for (int i = 0; i < tristrip.NofStrips; i++)
{
tristrip.Strip[i] = new VertexList();
gpc_vertex_list gpc_vtx_list = (gpc_vertex_list)Marshal.PtrToStructure(ptr, typeof(gpc_vertex_list));
tristrip.Strip[i].NofVertices = gpc_vtx_list.num_vertices;
tristrip.Strip[i].Vertex = new Vertex[tristrip.Strip[i].NofVertices];
IntPtr ptr2 = gpc_vtx_list.vertex;
for (int j = 0; j < tristrip.Strip[i].NofVertices; j++)
{
gpc_vertex gpc_vtx = (gpc_vertex)Marshal.PtrToStructure(ptr2, typeof(gpc_vertex));
tristrip.Strip[i].Vertex[j].X = gpc_vtx.x;
tristrip.Strip[i].Vertex[j].Y = gpc_vtx.y;
ptr2 = (IntPtr)(((int)ptr2) + Marshal.SizeOf(gpc_vtx));
}
ptr = (IntPtr)(((int)ptr) + Marshal.SizeOf(gpc_vtx_list));
}
return(tristrip);
}
public static Tristrip PolygonToTristrip(Polygon polygon)
{
gpc_tristrip gpc_strip = new gpc_tristrip();
gpc_polygon gpc_pol = GpcWrapper.PolygonTo_gpc_polygon(polygon);
gpc_polygon_to_tristrip(ref gpc_pol, ref gpc_strip);
Tristrip tristrip = GpcWrapper.gpc_strip_ToTristrip(gpc_strip);
GpcWrapper.Free_gpc_polygon(gpc_pol);
GpcWrapper.gpc_free_tristrip(ref gpc_strip);
return(tristrip);
}
public static Tristrip ClipToTristrip(GpcOperation operation, Polygon subject_polygon, Polygon clip_polygon)
{
gpc_tristrip gpc_strip = new gpc_tristrip();
gpc_polygon gpc_subject_polygon = GpcWrapper.PolygonTo_gpc_polygon(subject_polygon);
gpc_polygon gpc_clip_polygon = GpcWrapper.PolygonTo_gpc_polygon(clip_polygon);
gpc_tristrip_clip(operation, ref gpc_subject_polygon, ref gpc_clip_polygon, ref gpc_strip);
Tristrip tristrip = GpcWrapper.gpc_strip_ToTristrip(gpc_strip);
GpcWrapper.Free_gpc_polygon(gpc_subject_polygon);
GpcWrapper.Free_gpc_polygon(gpc_clip_polygon);
GpcWrapper.gpc_free_tristrip(ref gpc_strip);
return(tristrip);
}
private static Tristrip gpc_strip_ToTristrip( gpc_tristrip gpc_strip )
{
Tristrip tristrip = new Tristrip();
tristrip.NofStrips = gpc_strip.num_strips;
tristrip.Strip = new VertexList[tristrip.NofStrips];
IntPtr ptr = gpc_strip.strip;
for ( int i=0 ; i<tristrip.NofStrips ; i++ ) {
tristrip.Strip[i] = new VertexList();
gpc_vertex_list gpc_vtx_list = (gpc_vertex_list)Marshal.PtrToStructure( ptr, typeof(gpc_vertex_list) );
tristrip.Strip[i].NofVertices = gpc_vtx_list.num_vertices;
tristrip.Strip[i].Vertex = new Vertex[tristrip.Strip[i].NofVertices];
IntPtr ptr2 = gpc_vtx_list.vertex;
for ( int j=0 ; j<tristrip.Strip[i].NofVertices ; j++ ) {
gpc_vertex gpc_vtx = (gpc_vertex)Marshal.PtrToStructure( ptr2, typeof(gpc_vertex) );
tristrip.Strip[i].Vertex[j].X = gpc_vtx.x;
tristrip.Strip[i].Vertex[j].Y = gpc_vtx.y;
ptr2 = (IntPtr)( ((int)ptr2) + Marshal.SizeOf(gpc_vtx) );
}
ptr = (IntPtr)( ((int)ptr) + Marshal.SizeOf(gpc_vtx_list) );
}
return tristrip;
}