mirror of
https://github.com/irmen/prog8.git
synced 2024-08-21 12:29:02 +00:00
52 lines
1.3 KiB
Lua
52 lines
1.3 KiB
Lua
%import textio
|
|
%import floats
|
|
%import test_stack
|
|
%zeropage basicsafe
|
|
|
|
; Note: this program is compatible with C64 and CX16.
|
|
|
|
main {
|
|
const uword width = 30
|
|
const uword height = 20
|
|
const ubyte max_iter = 16
|
|
|
|
sub start() {
|
|
txt.print("calculating mandelbrot fractal...")
|
|
c64.SETTIM(0, 0, 0)
|
|
|
|
ubyte pixelx
|
|
ubyte pixely
|
|
|
|
for pixely in 0 to height-1 {
|
|
float yy = (pixely as float)/0.4/height - 1.0
|
|
|
|
for pixelx in 0 to width-1 {
|
|
float xx = (pixelx as float)/0.3/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.setcc(pixelx+4, pixely+1, 160, max_iter-iter)
|
|
}
|
|
}
|
|
|
|
float duration = (c64.RDTIM16() as float) / 60
|
|
txt.plot(0, 21)
|
|
txt.print("finished in ")
|
|
floats.print_f(duration)
|
|
txt.print(" seconds!\n")
|
|
|
|
; test_stack.test()
|
|
}
|
|
}
|