Function B2RotVec2MulT

CommonB2Math.go:651–656

Inverse rotate a vector

(q B2Rot, v B2Vec2)

/// Inverse rotate a vector
func B2RotVec2MulT(q B2Rot, v B2Vec2) B2Vec2 {
	return MakeB2Vec2(
		q.C*v.X+q.S*v.Y,
		-q.S*v.X+q.C*v.Y,
	)
}

func B2TransformVec2Mul(T B2Transform, v B2Vec2) B2Vec2 {
	return MakeB2Vec2(