public static Polygon Shape1minus2(List <Vec2> shape1, List <Vec2> shape2)
{
Polygon p1 = new Polygon(shape1);
Polygon p2 = new Polygon(shape2);
return(GpcWrapper.Clip(GpcWrapper.GpcOperation.Difference, p1, p2));
}
public static List <Vec2i> IntersectShapes(List <Vec2i> shape1, List <Vec2i> shape2)
{
Polygon p1 = new Polygon(shape1);
Polygon p2 = new Polygon(shape2);
Polygon p = GpcWrapper.Clip(GpcWrapper.GpcOperation.Intersection, p1, p2);
if (p == null || p.NumContours != 1)
{
return(new List <Vec2i>());
}
return(Vec2i.FromVec2dList(p[0]));
}
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);
}
public static Polygon Clip(GpcOperation operation, Polygon subject_polygon, Polygon clip_polygon)
{
gpc_polygon gpc_polygon = new gpc_polygon();
gpc_polygon gpc_subject_polygon = GpcWrapper.PolygonTo_gpc_polygon(subject_polygon);
gpc_polygon gpc_clip_polygon = GpcWrapper.PolygonTo_gpc_polygon(clip_polygon);
gpc_polygon_clip(operation, ref gpc_subject_polygon, ref gpc_clip_polygon, ref gpc_polygon);
Polygon polygon = GpcWrapper.gpc_polygon_ToPolygon(gpc_polygon);
GpcWrapper.Free_gpc_polygon(gpc_subject_polygon);
GpcWrapper.Free_gpc_polygon(gpc_clip_polygon);
GpcWrapper.gpc_free_polygon(ref gpc_polygon);
return(polygon);
}
public static Geometry.Shape BoxesToShape(List <Box2> boxes)
{
if (boxes.Count == 0)
{
return(null);
}
Polygon p = null;
foreach (Box2 b in boxes)
{
if (b.Dimensions.X > 0.0001 && b.Dimensions.Y > 0.0001)
{
Polygon pb = new Polygon(b.Corners());
if (p == null)
{
p = pb;
}
else
{
try
{
Polygon newPoly = GpcWrapper.Clip(GpcWrapper.GpcOperation.Union, p, pb);
p = newPoly;
}
catch (Exception)
{
throw;
}
}
}
}
List <List <Vec2> > vlists = PolygonToVectorLists(p);
if (vlists.Count == 0)
{
return(null);
}
return(new Geometry.Shape(vlists[0]));
}