Rotating In BitBlt

[SteveCRM]

All right, I know a little (I mean LITTLE) BitBlt. And I was wondering how I would rotate a picture in bitblt. I can make it move, but I want it to rotate when I press the side arrows, and go in that direction when I press up. In all, I want to make an asteroids clone in BitBlt. Thanks.

[Edited by SteveCRM on 04-20-2000 at 06:36 PM]

[Fox]

There's no function like BitBlt which would that make. And if there were one I don't know it would be very slow...

I think you're going to) use DirectDraw which is much faster or) have some pre-rotated pictures in memory which you draw like animations. Second way is as fast as BitBlt (because it *is* BitBlt and nothing more) but you waste as more memory as you have rotation steps.

[KENNNY]

problem is, rotation in DirectDraw isn't supported on many video cards :( To do proper, fast rotation, you'd have to use Direct3d (urghhh) :)
I'd use the pre-rotated method as Fox says.