On Oct 10, 2010, at 4:17 AM, 김태윤 <[email protected]> wrote: > there is little images(16x16) that cropped from other chipset > and I gether them and make an image which size is about 320 x 320 > > and I rotate it, but it is very very slow and blink alot
This is because it really does take a lot of processing to rotate a bitmap image by an arbitrary angle. I bet it's really fast if you rotate by exactly 90 degrees.... > so I test basic polygon > it works perfectly, no delay, no blinking, even if when it grows big Yes, that's because a polygon is determined by just a few points, so there's a lot less processing to be done. If it makes you feel better, in the old image library the polygon would have been just as slow as the bitmap :-) I don't know enough about the internals of the image library to tell you how to speed up operations on the former picture. Stephen Bloch _________________________________________________ For list-related administrative tasks: http://lists.racket-lang.org/listinfo/users
