prog8/compiler/examples/swirl.p8

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%import c64utils
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%option enable_floats
~ main {
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const uword width = 320
const uword height = 200
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sub start() {
vm_gfx_clearscr(0)
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float t
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ubyte color
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while true {
float x = sin(t*1.01) + cos(t*1.1234)
float y = cos(t) + sin(t*0.03456)
vm_gfx_pixel(screenx(x), screeny(y), color//16)
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t += 0.01
color++
}
}
sub screenx(float x) -> word {
return (x/4.1* (width as float)) as word + width // 2
}
sub screeny(float y) -> word {
return (y/4.1 * (height as float)) as word + height // 2
}
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}