Method Rot

util.go:290–296

Rot rotates the line OP by phi radians CCW.

(phi float64, p0 Point)

// Rot rotates the line OP by phi radians CCW.
func (p Point) Rot(phi float64, p0 Point) Point {
	sinphi, cosphi := math.Sincos(phi)
	return Point{
		p0.X + cosphi*(p.X-p0.X) - sinphi*(p.Y-p0.Y),
		p0.Y + sinphi*(p.X-p0.X) + cosphi*(p.Y-p0.Y),
	}
}

// Hadamard returns the Hadamard product, or the element-wise product, of the point.
func (p Point) Hadamard(q Point) Point {