https://github.com/akkartik/mu/blob/main/apps/ex6.mu

     1 # Drawing ASCII text incrementally.
     2 #
     3 # To build a disk image:
     4 #   ./translate apps/ex6.mu        # emits code.img
     5 # To run:
     6 #   qemu-system-i386 code.img
     7 # Or:
     8 #   bochs -f bochsrc               # bochsrc loads code.img
     9 #
    10 # Expected output: a box and text that doesn't overflow it
    11
    12 fn main screen: (addr screen), keyboard: (addr keyboard), data-disk: (addr disk) {
    13   # drawing text within a bounding box
    14   draw-box-on-real-screen 0xf, 0x1f, 0x79, 0x51, 0x4
    15   var x/eax: int <- copy 0x20
    16   var y/ecx: int <- copy 0x20
    17   x, y <- draw-text-wrapping-right-then-down screen, "hello ",     0x10/xmin, 0x20/ymin, 0x78/xmax, 0x50/ymax, x, y, 0xa/fg, 0/bg
    18   x, y <- draw-text-wrapping-right-then-down screen, "from ",      0x10/xmin, 0x20/ymin, 0x78/xmax, 0x50/ymax, x, y, 0xa/fg, 0/bg
    19   x, y <- draw-text-wrapping-right-then-down screen, "baremetal ", 0x10/xmin, 0x20/ymin, 0x78/xmax, 0x50/ymax, x, y, 0xa/fg, 0/bg
    20   x, y <- draw-text-wrapping-right-then-down screen, "Mu!",        0x10/xmin, 0x20/ymin, 0x78/xmax, 0x50/ymax, x, y, 0xa/fg, 0/bg
    21
    22   # drawing at the cursor in multiple directions
    23   draw-text-wrapping-down-then-right-from-cursor-over-full-screen screen, "abc", 0xa/fg, 0/bg
    24   draw-text-wrapping-right-then-down-from-cursor-over-full-screen screen, "def", 0xa/fg, 0/bg
    25
    26   # test drawing near the edge
    27   x <- draw-text-rightward screen, "R", 0x7f/x, 0x80/xmax=screen-width, 0x18/y, 0xa/fg, 0/bg
    28   draw-text-wrapping-right-then-down-from-cursor-over-full-screen screen, "wrapped from R", 0xa/fg, 0/bg
    29
    30   x <- draw-text-downward screen, "D", 0x20/x, 0x2f/y, 0x30/ymax=screen-height, 0xa/fg, 0/bg
    31   draw-text-wrapping-down-then-right-from-cursor-over-full-screen screen, "wrapped from D", 0xa/fg, 0/bg
    32 }