And that's the exact same thing you do in OpenGL too. My gl2d code just packages those GL commands in a nice way. I have a new experiment with doing the same thing but with a functional packaging:
https://github.com/get-bonus/get-bonus/blob/master/exp/gl.rkt Look at the contracts at the bottom. (This package, btw, can very easily get very high frame rates with very naive rendering, because it automatically compiles common draw sequences to the card.) Jay 2011/5/9 Noel Welsh <[email protected]>: > 2011/5/9 Jyu 。 <[email protected]>: >> I can rotate a bitmap% around the (0,0) coordinate point, but I cannot do >> the same for any other point.. > > You probably need to call translate and then rotate. There is a > transformation matrix maintained by the dc% which allows for rotation, > translation, and scaling. If you first translate and then rotate you > should be able to rotate your bitmap around an arbitrary point. (I say > "should" because I haven't tested it myself.) > > HTH, > N. > > _________________________________________________ > For list-related administrative tasks: > http://lists.racket-lang.org/listinfo/users -- Jay McCarthy <[email protected]> Assistant Professor / Brigham Young University http://faculty.cs.byu.edu/~jay "The glory of God is Intelligence" - D&C 93 _________________________________________________ For list-related administrative tasks: http://lists.racket-lang.org/listinfo/users
