func (r Rectangle) Empty() bool {
	return r.Min.X >= r.Max.X || r.Min.Y >= r.Max.Y
}
func (r Rectangle) Empty() bool {
	return r.Min.X >= r.Max.X || r.Min.Y >= r.Max.Y
}
func ( r Rectangle ) Empty ( ) bool { return r . Min . X >= r . Max . X || r . Min . Y >= r . Max . Y }
// Empty reports whether the rectangle contains no points.
Empty reports whether the rectangle contains no points .