f32/d3/rect.go
func CopyRect(r Rectangle) Rectangle {
	r1 := NewRect()
	r1.Min.Assign(r.Min)
	r1.Max.Assign(r.Max)
	return r1
}
func CopyRect(r Rectangle) Rectangle {
	r1 := NewRect()
	r1.Min.Assign(r.Min)
	r1.Max.Assign(r.Max)
	return r1
}
// CopyRect allocates and returns a new Rectangle that is the copy of r.