Method Rotate

utils.go:229–235

(angle float32)

}

func (point Vector) Rotate(angle float32) Vector {
	x := point.X
	y := point.Y
	point.X = x*float32(math.Cos(float64(angle))) - y*float32(math.Sin(float64(angle)))
	point.Y = x*float32(math.Sin(float64(angle))) + y*float32(math.Cos(float64(angle)))
	return point
}

func (point Vector) Negated() Vector {
	return Vector{-point.X, -point.Y}