Vector2F
add(Vector2F e)
cross(Vector2F e)
div(float k)
lerp(Vector2F vec, float a)
mult(float k)
norm()
reflect(Vector2F vec)
rot0(float theta)
sub(Vector2F e)
float
dist(Vector2F e)
dot(Vector2F e)
Matrix2
rot0(Vector2F v)
void
rot1(Vector2F v)