Updated:
- Increased from 160x50 to 252x100 (notice the PRG is smaller than before, removed memset call)
- Can now use the mouse (left click to "etch" into the background, i.e. user can dynamically impact the background)
- An additional dynamic image appears when pressing mouse buttons (gets larger the more buttons you press)
- Can still move the original object (arrow keys) and "etch" while pressing buttons
Kept col/row under 255 for now to try to stick with 8-bit maths, but including the PRG itself this is probably close to maxing out the ~32K LoRAM. Performance isn't too bad, might be able to make something with it (like the object could leave trails into the background, like footsteps or snail trail). Or maybe little effects like water ripples, smoke, background birds (without costing a sprite index).
cc65 / C-source is in the ZIP. Might be interesting to see a comparable port to prog8, nxtBasic, etc. (for both performance and code size)
(remember to use CTRL+M in the emulator to better align your host mouse with the emulator mouse cursor)
Try It Now!
- DYNBACK2.jpg (120.73 KiB) Viewed 135 times
