mirror of
https://github.com/irmen/prog8.git
synced 2024-11-03 13:07:54 +00:00
89 lines
2.0 KiB
Lua
89 lines
2.0 KiB
Lua
%import textio
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%import floats
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%zeropage basicsafe
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main {
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const uword width = 256
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const uword height = 240
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const ubyte max_iter = 16 ; 32 actually looks pretty nice but takes longer
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sub start() {
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initialize()
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mandel()
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repeat {
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; do nothing
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}
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}
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sub mandel() {
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const float XL=-2.200
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const float XU=0.800
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const float YL=-1.300
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const float YU=1.300
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float dx = (XU-XL)/width
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float dy = (YU-YL)/height
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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 = YL+dy*(pixely as float)
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cx16.FB_cursor_position(0, pixely)
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for pixelx in 0 to width-1 {
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float xx = XL+dx*(pixelx as float)
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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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cx16.FB_set_pixel(max_iter-iter)
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}
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print_time()
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}
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}
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sub initialize() {
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void cx16.screen_set_mode($80)
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txt.plot(32, 5)
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txt.print("256*240")
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txt.plot(32, 6)
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txt.print("mandel-")
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txt.plot(33, 7)
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txt.print("brot")
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txt.plot(32, 9)
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txt.print("floats")
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txt.plot(32, 10)
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txt.print_b(max_iter)
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txt.print(" iter")
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cx16.clock_set_date_time(0, 0, 0, 0)
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cx16.r0=0
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cx16.FB_init()
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}
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sub print_time() {
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void cx16.clock_get_date_time()
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txt.plot(33, 12)
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if lsb(cx16.r2) < 10
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c64.CHROUT('0')
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txt.print_ub(lsb(cx16.r2))
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c64.CHROUT(':')
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if msb(cx16.r2) < 10
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c64.CHROUT('0')
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txt.print_ub(msb(cx16.r2))
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}
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}
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