prog8/examples/cx16/mandelbrot.p8

48 lines
1.2 KiB
Lua

%import textio
%import floats
%zeropage basicsafe
main {
const uword width = 60
const uword height = 50
const ubyte max_iter = 16
sub start() {
txt.print("calculating mandelbrot fractal...\n\n")
cbm.SETTIM(0,0,0)
ubyte pixelx
ubyte pixely
for pixely in 0 to height-1 {
float yy = (pixely as float)/0.40/height - 1.3
for pixelx in 0 to width-1 {
float xx = (pixelx as float)/0.32/width - 2.2
float xsquared = 0.0
float ysquared = 0.0
float x = 0.0
float y = 0.0
ubyte iter = 0
while iter<max_iter and xsquared+ysquared<4.0 {
y = x*y*2.0 + yy
x = xsquared - ysquared + xx
xsquared = x*x
ysquared = y*y
iter++
}
txt.color2(1, max_iter-iter)
txt.spc()
}
txt.nl()
}
float duration = (cbm.RDTIM16() as float) / 60
txt.print("\nfinished in ")
floats.print_f(duration)
txt.print(" seconds!\n")
}
}