Align object to vector using Dgame framework

[codenstuff via Digitalmars-d-learn]

On Monday, 13 July 2015 at 19:07:55 UTC, Márcio Martins wrote:
> On Monday, 13 July 2015 at 16:11:03 UTC, codenstuff wrote:
>> [...]
>
> This is not really a game development forum but here you go:
> auto rads = atan2(object.velocity.y, object.velocity.x); // 
> returns radians
> auto degs = angle * (180.0f / PI); // convert to degrees
> shape.rotate(degs);
>
> I suggest you store velocity as a Vector2f to avoid later 
> confusion.
>
> It is really useful to learn basic linear algebra, and 
> trigonometry as a game developer - you will be needing these 
> tools on a daily basis.

This does not work as expected. It keeps rotating object as long 
as vector is at angle. Any idea how to improve on this?