func (r Rectangle) Empty() bool {
	return r.Min[0] >= r.Max[0] || r.Min[1] >= r.Max[1]
}
func (r Rectangle) Empty() bool {
	return r.Min[0] >= r.Max[0] || r.Min[1] >= r.Max[1]
}
func ( r Rectangle ) Empty ( ) bool { return r . Min [ 0 ] >= r . Max [ 0 ] || r . Min [ 1 ] >= r . Max [ 1 ] }
// Empty reports whether the rectangle contains no points.
Empty reports whether the rectangle contains no points .