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https://github.com/irmen/prog8.git
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51 lines
1.5 KiB
Lua
51 lines
1.5 KiB
Lua
%import graphics
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%import floats
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%import math
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%option no_sysinit
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; Bubble Universe
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; see: https://stardot.org.uk/forums/viewtopic.php?f=54&t=25833
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main {
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sub start() {
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graphics.enable_bitmap_mode()
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const ubyte n = 200
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const float r = floats.TWOPI/235
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const ubyte s = 60
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float t
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uword[] palette = [$000, $000, $00f, $f0f, $0ff, $fff]
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cx16.FB_set_palette(palette, 0, len(palette))
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repeat {
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graphics.clear_screen(1,0)
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ubyte i
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for i in 0 to n {
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ubyte j
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float ang1_start = i as float + t
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float ang2_start = i as float * r + t
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float v=0
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float u=0
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for j in 0 to n {
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float ang1 = ang1_start+v
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float ang2 = ang2_start+u
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u=floats.sin(ang1)+floats.sin(ang2)
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v=floats.cos(ang1)+floats.cos(ang2)
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ubyte c=2
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if i>=100
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c++
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if j>=100
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c+=2
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graphics.colors(c,0)
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; TODO nice rgb color?: GCOL i%/num_curves%*255,j%/iteration_length%*255,255-(i%/num_curves%+j%/iteration_length%)*128
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uword a = 40 + ((2+u) * s) as uword
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uword b = ((v+2)*s) as uword
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graphics.plot(a,b)
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}
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}
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t+=0.025
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}
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}
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}
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