private static List <List <Vec2> > PolygonToTriangleStrips(Dictionary <Vec2, int> .KeyCollection keyCollection)
{
List <Vec2> temp = new List <Vec2>();
foreach (Vec2 v in keyCollection)
{
temp.Add(v);
}
Polygon p = new Polygon(temp);
TriStrip t = p.ToTriangleStrip();
List <List <Vec2> > ret = new List <List <Vec2> >();
if (t.Count == 0)
{
return(ret); // throw new Exception("No triangle strip");
}
foreach (List <Vec2d> vl in t.Strips)
{
List <Vec2> vertList = new List <Vec2>();
foreach (Vec2d v in vl)
{
vertList.Add(GetFromList(temp, new Vec2((float)v.X, (float)v.Y)));
}
ret.Add(vertList);
}
return(ret);
}
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);
}
internal static List <List <Vec2i> > PolygonToTriangleStrips(List <Vec2i> vecs)
{
Polygon p = new Polygon(vecs);
TriStrip t = p.ToTriangleStrip();
List <List <Vec2i> > ret = new List <List <Vec2i> >();
if (t.Count == 0)
{
return(ret); // throw new Exception("No triangle strip");
}
foreach (List <Vec2d> vl in t.Strips)
{
ret.Add(Vec2i.FromVec2dList(vl));
}
return(ret);
}
private static TriStrip gpc_strip_ToTristrip(gpc_tristrip gpc_strip)
{
int numStrips = gpc_strip.num_strips;
TriStrip tristrip = new TriStrip(numStrips);
IntPtr ptr = gpc_strip.strip;
for (int i = 0; i < numStrips; ++i)
{
gpc_vertex_list gpc_vtx_list = (gpc_vertex_list)Marshal.PtrToStructure(ptr, typeof(gpc_vertex_list));
int numVertices = gpc_vtx_list.num_vertices;
tristrip[i].Capacity = numVertices;
IntPtr ptr2 = gpc_vtx_list.vertex;
for (int j = 0; j < numVertices; ++j)
{
gpc_vertex gpc_vtx = (gpc_vertex)Marshal.PtrToStructure(ptr2, typeof(gpc_vertex));
tristrip[i].Add(new Vec2d(gpc_vtx.x, gpc_vtx.y));
ptr2 = (IntPtr)(((int)ptr2) + Marshal.SizeOf(gpc_vtx));
}
ptr = (IntPtr)(((int)ptr) + Marshal.SizeOf(gpc_vtx_list));
}
return(tristrip);
}