public Ellipse(Vector centerPt, int radius1, int radius2)
 {
     Geometry = new EllipseGeometry(centerPt.ToWindowsPt(), (double)radius1, (double)radius2);
     DrawMe = true;
     BoundingRectangle = Geometry.Bounds;
     CenterPoint = centerPt;
 }
 public Ellipse(Vector centerPt, Tuple<int,int> radii)
 {
     Geometry = new EllipseGeometry(centerPt.ToWindowsPt(), (double)radii.Item1, (double)radii.Item2);
     DrawMe = true;
     BoundingRectangle = Geometry.Bounds;
     CenterPoint = centerPt;
 }