What do you need it for? And do which version of blitz are you using? If you are using B3D, you could create a sprite and have it rendered first and then your other 2d stuff drawn after that. That way you could easily rotate the image without problems. But that only works for B3D. If you are using B2D or B+, then your only option is either pre-done images rotated and that will take a lot of space, or realtime software rotations, which limits what can be done besides the rotation if its full screen.
Blitz have built in commands for rotating images, check with the manual under the image category. There is also an example of usage there. Its not really useful for realtime graphics, but you could use it to rotate the image when loaded and before you need it, so that you have a number of frames that can be used for animation.
Blitz have built in commands for rotating images, check with the manual under the image category. There is also an example of usage there. Its not really useful for realtime graphics, but you could use it to rotate the image when loaded and before you need it, so that you have a number of frames that can be used for animation.