Function rotatePoint

text/text.go:167–180

rotatePoint applies rotation theta (in radians) about the origin to point p.

(theta float64, p vg.Point)

// rotatePoint applies rotation theta (in radians) about the origin to point p.
func rotatePoint(theta float64, p vg.Point) vg.Point {
	if theta == 0 {
		return p
	}
	x := float64(p.X)
	y := float64(p.Y)

	sin, cos := math.Sincos(theta)

	return vg.Point{
		X: vg.Length(x*cos - y*sin),
		Y: vg.Length(y*cos + x*sin),
	}
}

func max(d ...vg.Length) vg.Length {
	o := vg.Length(math.Inf(-1))