mirror of
https://github.com/irmen/prog8.git
synced 2024-08-23 10:29:40 +00:00
47 lines
1.1 KiB
Lua
47 lines
1.1 KiB
Lua
%target cx16
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%import cx16textio
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%import cx16flt
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%zeropage basicsafe
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; TODO fix this, only black squares output...
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main {
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const uword width = 60
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const uword height = 50
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const ubyte max_iter = 16
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sub start() {
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txt.print("calculating mandelbrot fractal...\n\n")
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ubyte pixelx
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ubyte pixely
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for pixely in 0 to height-1 {
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float yy = (pixely as float)/0.40/height - 1.3
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for pixelx in 0 to width-1 {
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float xx = (pixelx as float)/0.32/width - 2.2
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float xsquared = 0.0
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float ysquared = 0.0
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float x = 0.0
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float y = 0.0
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ubyte iter = 0
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while iter<max_iter and xsquared+ysquared<4.0 {
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y = x*y*2.0 + yy
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x = xsquared - ysquared + xx
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xsquared = x*x
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ysquared = y*y
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iter++
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}
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; txt.setchr(pixelx, pixely, '*')
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txt.color2(1, max_iter-iter)
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c64.CHROUT(' ')
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}
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c64.CHROUT('\n')
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}
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}
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}
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