Function B2RotMulT

CommonB2Math.go:635–640

Transpose multiply two rotations: qT * r

(q, r B2Rot)

/// Transpose multiply two rotations: qT * r
func B2RotMulT(q, r B2Rot) B2Rot {
	return B2Rot{
		S: q.C*r.S - q.S*r.C,
		C: q.C*r.C + q.S*r.S,
	}
}

/// Rotate a vector
func B2RotVec2Mul(q B2Rot, v B2Vec2) B2Vec2 {