private static Paths PolygonToClprPaths(Polygon polygon)
{
Paths result = new List <List <IntPoint> >(polygon.NumContours);
for (int j = 0; j < polygon.NumContours; ++j)
{
result.Add(new List <IntPoint>(polygon[j].Count));
for (int i = 0; i < polygon[j].Count; ++i)
{
Vec2d v = polygon[j][i];
IntPoint p;
p.X = (Int32)(v.X * PrecisionScale);
p.Y = (Int32)(v.Y * PrecisionScale);
result[j].Add(p);
}
if (Clipper.Orientation(result[j]) == polygon.IsHole(j))
{
result[j].Reverse();
}
}
return(result);
}
private static gpc_polygon PolygonTo_gpc_polygon(Polygon polygon)
{
gpc_polygon gpc_pol = new gpc_polygon();
if (polygon != null)
{
gpc_pol.num_contours = polygon.NumContours;
int[] hole = new int[polygon.NumContours];
for (int i = 0; i < polygon.NumContours; ++i)
{
hole[i] = (polygon.IsHole(i) ? 1 : 0);
}
gpc_pol.hole = Marshal.AllocCoTaskMem(polygon.NumContours * Marshal.SizeOf(hole[0]));
if (polygon.NumContours > 0)
{
Marshal.Copy(hole, 0, gpc_pol.hole, polygon.NumContours);
gpc_pol.contour = Marshal.AllocCoTaskMem(polygon.NumContours * Marshal.SizeOf(new gpc_vertex_list()));
}
IntPtr ptr = gpc_pol.contour;
for (int i = 0; i < polygon.NumContours; ++i)
{
gpc_vertex_list gpc_vtx_list = new gpc_vertex_list();
gpc_vtx_list.num_vertices = polygon[i].Count;
gpc_vtx_list.vertex = Marshal.AllocCoTaskMem(polygon[i].Count * Marshal.SizeOf(new gpc_vertex()));
IntPtr ptr2 = gpc_vtx_list.vertex;
for (int j = 0; j < polygon[i].Count; ++j)
{
gpc_vertex gpc_vtx = new gpc_vertex();
gpc_vtx.x = polygon[i][j].X;
gpc_vtx.y = polygon[i][j].Y;
Marshal.StructureToPtr(gpc_vtx, ptr2, false);
ptr2 = (IntPtr)(((int)ptr2) + Marshal.SizeOf(gpc_vtx));
}
Marshal.StructureToPtr(gpc_vtx_list, ptr, false);
ptr = (IntPtr)(((int)ptr) + Marshal.SizeOf(gpc_vtx_list));
}
}
return(gpc_pol);
}