prog8/examples/rasterbars.p8
2019-01-27 22:59:40 +01:00

46 lines
910 B
Lua

%import c64utils
%import c64lib
~ main {
sub start() {
c64.SCROLY &= %11101111 ; blank the screen
c64utils.set_rasterirq_excl(40)
while(true) {
}
}
}
~ irq {
const ubyte barheight = 4
ubyte[13] colors = [6,2,4,5,15,7,1,13,3,12,8,11,9]
ubyte color = 0
ubyte ypos = 0
sub irq() {
Y++ ; delay for alignment
Y++ ; delay for alignment
Y++ ; delay for alignment
Y++ ; delay for alignment
ubyte rasterpos = c64.RASTER
if color!=len(colors) {
c64.EXTCOL = colors[color]
c64.RASTER = rasterpos+barheight
color++
}
else {
Y++ ; delay for alignment
Y++ ; delay for alignment
ypos += 2
c64.EXTCOL = 0
c64.RASTER = sin8u(ypos)/2+40
color = 0
}
}
}