We are just getting ready to "release" my son's little Racket game, but after doing all the development on OS-X, I find that the windows performance is terrible. In hindsight, we should have just used bitmap / dc drawing directly, but it grew out of playing with HTDP / Realm of Racket examples.
It is a scrolling game, with a 4096 x 640 bitmap drawn into a 1280 x 640 window. It started out with the map just being a big image composed with place-image for each solid object, but that got incrementally slower for every block in the map. Freezing the image made it even slower. On the mac at least, I found that if I manually created a bitmap and draw the objects into it with (send dc draw-bitmap ...) then it would draw quickly, but only if I used (send hidden-canvas make-bitmap ...) to create the bitmap. Using (make-platform-butmap ...) or (make-screen-bitmap ...) both resulted in slow performance. On windows, it seems I always get slow performance. A simple testbed program that just draws the bitmap to a window with (send dc draw-bitmap ...) is fast, but the (place-image ...) of the bitmap in the 2htdp/universe program is slow, and it does seem to get slower with increasing bitmap size. Any suggestions to save us from having to rewrite all the drawing code? -- You received this message because you are subscribed to the Google Groups "Racket Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to racket-users+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
