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https://github.com/irmen/prog8.git
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ee81da14d6
programs will now be a lot smaller than before if they use gfx2 (or monogfx if they were only using monochrome drawing) monogfx also fixes some drawing errors with small horizontal lines, and stippled vertical lines.
66 lines
1.6 KiB
Lua
66 lines
1.6 KiB
Lua
%import palette
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%import math
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%import gfx2
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%option no_sysinit
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; Vertical rasterbars a.k.a. "Kefren bars"
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; also see: rasterbars.p8
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main {
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sub start() {
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uword[32] colors = [
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$000,
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$011, $112, $213, $214,
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$315, $316, $417, $418,
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$519, $51a, $62b, $62c,
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$73d, $73e, $84f, $94f,
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$93e, $83d, $82c, $72b,
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$71a, $619, $618, $517,
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$516, $415, $414, $313,
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$312, $211, $100
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]
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palette.set_rgb(&colors, len(colors))
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gfx2.screen_mode(1) ; lores 256 colors
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cx16.VERA_DC_VSCALE = 0 ; display trick spoiler.......: stretch 1 line of display all the way to the bottom
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sys.set_rasterirq(&irq.irqhandler, 0)
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repeat {
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; don't exit
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}
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}
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}
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irq {
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const ubyte BAR_Y_OFFSET = 5
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uword next_irq_line = 0
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ubyte anim1 = 0
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ubyte av1 = 0
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ubyte anim2 = 0
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ubyte av2 = 0
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ubyte[32] pixels = 0 to 31
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sub irqhandler() {
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next_irq_line += BAR_Y_OFFSET
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anim1 += 7
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anim2 += 4
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if next_irq_line > 480-BAR_Y_OFFSET {
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av1++
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av2 += 2
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anim1 = av1
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anim2 = av2
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next_irq_line = 0
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; erase the bars
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gfx2.horizontal_line(0, 0, 320, 3)
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} else {
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; add new bar on top
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gfx2.position(math.sin8u(anim1)/2 + math.cos8u(anim2)/2 + $0010, 0)
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gfx2.next_pixels(pixels, len(pixels))
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}
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sys.set_rasterline(next_irq_line)
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}
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}
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