mirror of
https://github.com/irmen/prog8.git
synced 2024-11-03 13:07:54 +00:00
57 lines
1.4 KiB
Lua
57 lines
1.4 KiB
Lua
%import c64utils
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%option enable_floats
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~ main {
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const uword width = 320 // 2
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const uword height = 256 // 2
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const uword xoffset = 40
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const uword yoffset = 30
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sub start() {
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vm_gfx_clearscr(11)
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vm_gfx_text(2, 1, 1, "Calculating Mandelbrot Fractal...")
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for ubyte pixely in yoffset to yoffset+height-1 {
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float yy = flt((pixely-yoffset))/height/3.6+0.4
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for uword pixelx in xoffset to xoffset+width-1 {
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float xx = flt((pixelx-xoffset))/width/3.0+0.2
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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<32 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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vm_gfx_pixel(pixelx, pixely, iter)
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}
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}
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vm_gfx_text(11, 21, 1, "Finished!")
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}
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}
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; ---- some weird testing 60hz irq handling routine------
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~ irq {
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memory ubyte jiffyclockHi = $a0
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memory ubyte jiffyclockMid = $a1
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memory ubyte jiffyclockLo = $a2
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sub irq() {
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vm_gfx_pixel(jiffyclockLo,190,jiffyclockHi)
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vm_gfx_pixel(jiffyclockLo,191,jiffyclockMid)
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vm_gfx_pixel(jiffyclockLo,192,jiffyclockLo)
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return
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}
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}
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