Method Transform

util.go:438–448

Transform transforms the rectangle by affine transformation matrix m and returns the new bounds of that rectangle.

(m Matrix)

// Transform transforms the rectangle by affine transformation matrix m and returns the new bounds of that rectangle.
func (r Rect) Transform(m Matrix) Rect {
	p0 := m.Dot(Point{r.X0, r.Y0})
	p1 := m.Dot(Point{r.X1, r.Y0})
	p2 := m.Dot(Point{r.X1, r.Y1})
	p3 := m.Dot(Point{r.X0, r.Y1})
	x0 := math.Min(p0.X, math.Min(p1.X, math.Min(p2.X, p3.X)))
	y0 := math.Min(p0.Y, math.Min(p1.Y, math.Min(p2.Y, p3.Y)))
	x1 := math.Max(p0.X, math.Max(p1.X, math.Max(p2.X, p3.X)))
	y1 := math.Max(p0.Y, math.Max(p1.Y, math.Max(p2.Y, p3.Y)))
	return Rect{x0, y0, x1, y1}
}

// Add returns a rect that encompasses both the current rect and the given rect.
func (r Rect) Add(q Rect) Rect {