[Gambas-user] the math behind full screen rotation

[John Spikowski]

On Wed, 2011-03-23 at 23:03 -0400, Kevin Fishburne wrote:

> That will probably work, but there should be a mathematical way to 
> compensate for not cropping the image twice, or even once. As long as 
> the entire image is preserved by the rotation function (it is) and it 
> behaves in a predictable manner (it does), the camera's coordinates 
> should be able to be translated and rotated so that they are in the same 
> position in the rotated image as they were in the non-rotated image. For 
> the sake of efficiency that is what I'm trying to accomplish.
> 
This thread might help. (or not)

http://forums.libsdl.org/viewtopic.php?t=2983&sid=1d2c6a94470c0fd56f3f542cd702ec37