Golang Vector.SetVec Examples

Example #1

File: vec.go Project: johnny-morrice/amoebethics

// Map produces a vector that is within the bounds of the
// rectangular manifold of toroidal space, given a vector
// that is on the torus but may be outside these bounds.
func (t Torus) Map(v *mat64.Vector) {
	x := v.At(0, 0)
	y := v.At(1, 0)

	remx := x
	right := t.W / 2
	if math.Abs(x) > right {
		remx = math.Mod(t.W, -x)
	}
	remy := y
	top := t.H / 2
	if math.Abs(y) > top {
		remy = math.Mod(t.H, -y)
	}

	v.SetVec(0, remx)
	v.SetVec(1, remy)
}