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I have been expirementing with Writable rasters, and the speed increases they offer, and I have put together this scenario as a Demo to the kind of thinks that can be done with them.
I have implemented writable rasters and a byte based lookup table for fast reading and writing to and from Greenfoot Images, in a handy FastImage class.
The demos that are so far included in this scenario are:
1: Fade Effect. Click to make interesting lines that fade away and blur
2: Fade Effect #2
3: Waves. Exploits a usefull quirk when the color value goes out of bounds ;)
4: Swirl. A cool spinning and whirling effect. Use your mouse to add more to the vat!
5: Plasma. More expirimentation with the color glitch.
6: Paint. Watch it drip and slide, and has interesting rules. Expirimentation with line drawing
7:Tunnel. Use the arrow keys to move around and explore! :P
Use the number keys to switch between the demos.