[geekmaster]

When I get back, I hope to see the following games running in #!/bin/sh using scripts from this thread as a guide:

* HINTS:

Spoiler:

We can draw filled circles by controlling the "count=" param of "dd", using distance between left and right x-coords on each row, in a "filled midpoint circle agorithm". We can draw up to 600 consecutive white pixels like this:

initvar () {
  W=$(echo -e '\xff');W=$W$W$W$W$W$W;W=$W$W$W$W$W;W=$W$W$W$W$W;W=$W$W$W$W # 600px white
}
...
echo -n $W|dd of=/dev/fb0 bs=1 count=$((x1-x0+1)) seek=$((y0*VX+x0)) 2>/dev/null

And we can draw black pixels from /dev/zero, as shown in previous scripts in this thread.

For fastest eink screen updates, we should use only all-white or all-black pixels (no gray pixels). We can use dithering for grayscale pixels (shadows). A 2x2 checkerboard makes a nice gray fill pattern.

We can make a nice blitter using "dd" to iteratively copy individual scan lines from a rectangular (or circular) portion of a raw image file to a portion of the eink screen. We can use this to copy sprites, game tiles, and bitmap text characters from a character font map and game resources image file.

We can use "hexdump" to read pixels from the framebuffer, if we want to try OCR techniques or other image processing of framework graphic content place onscreen by kindlets or framework menus. We can see how to process binary files with "hexdump" in the touchpaint script here:

https://www.mobileread.com/forums/sho....php?p=1989102

Good luck!