Function B2Vec2CrossScalarVector

CommonB2Math.go:505–507

Perform the cross product on a scalar and a vector. In 2D this produces a vector.

(s float64, a B2Vec2)

/// Perform the cross product on a scalar and a vector. In 2D this produces
/// a vector.
func B2Vec2CrossScalarVector(s float64, a B2Vec2) B2Vec2 {
	return MakeB2Vec2(-s*a.Y, s*a.X)
}

/// Multiply a matrix times a vector. If a rotation matrix is provided,
/// then this transforms the vector from one frame to another.