public static Point[] GeometryPolygonIntersection(ShapeGeometry geometry, PolygonGeometry polygon)
{
if (geometry == null || polygon == null)
{
return(null);
}
if (!geometry.Bounds.IntersectsWith(polygon.Bounds))
{
return(new Point[0]);
}
LineGeometry[] edges = polygon.Edges;
Point[] intersections = null;
foreach (LineGeometry edge in edges)
{
intersections = intersections == null
? geometry.Intersect(edge)
: intersections.Union(geometry.Intersect(edge)).ToArray();
}
return(intersections);
}
public static Point[] PolygonPolygonIntersection(PolygonGeometry firstPolygon, PolygonGeometry secondPolygon)
{
if (firstPolygon == null || secondPolygon == null)
{
return(new Point[0]);
}
if (!firstPolygon.Bounds.IntersectsWith(secondPolygon.Bounds))
{
return(new Point[0]);
}
LineGeometry[] edges = firstPolygon.Edges;
Point[] intersections = null;
foreach (LineGeometry aEdge in edges)
{
intersections = intersections == null
? GeometryPolygonIntersection(aEdge, secondPolygon)
: intersections.Union(GeometryPolygonIntersection(aEdge, secondPolygon)).ToArray();
}
return(intersections);
}