private Vector2 BoxToWorld(Vector2 p)
{
// // translate p to obb center basis
// var offset = p-Center;
// // rotate around center and translate back
// return Matrix23.Rotation(Turn)*offset+Center;
return(Matrix23.Rotation(Turn) * p);
}
private void WorldToBox(ref Vector2 p)
{
// // translate p to obb center basis
// var offset = p-Center;
// // rotate around center and translate back
// p = Matrix23.Rotation(-Turn)*offset+Center;
p = Matrix23.Rotation(-Turn) * p;
}