void DrawRect(Draw&draw, Rect& r, int w = 1, Color c = Black())
{
	Vector<Point> ps;
	ps << r.TopLeft() << r.TopRight() <<
	r.BottomRight() << r.BottomLeft() << r.TopLeft();
	
        draw.DrawPolyline(ps , w, c);
}

void DrawEllipse(Draw& w, Rect& r, Color c = Black(), int with = 1)
{
	Color nullcolor;
        nullcolor.SetNull();
        w.DrawEllipse(r, nullcolor, with, c);
}