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# Copyright (C) 2005-2008, Parrot Foundation.
=head1 NAME
examples/pir/mandel.pir - Print the Mandelbrot set
=head1 SYNOPSIS
% ./parrot examples/pir/mandel.pir
=head1 DESCRIPTION
This prints an ASCII-art representation of the Mandelbrot set.
Translated from C code by Glenn Rhoads into Parrot assembler
by Leon Brocard <acme@astray.com>.
Translated from PASM to PIR by Bernhard Schmalhofer.
The C code is:
main() {
int x, y, k;
char *b = " .:,;!/>)|&IH%*#";
float r, i, z, Z, t, c, C;
for (y=30; puts(""), C = y*0.1 - 1.5, y--;) {
for (x=0; c = x*0.04 - 2, z=0, Z=0, x++ < 75;) {
for (r=c, i=C, k=0; t = z*z - Z*Z + r, Z = 2*z*Z + i, z=t, k<112; k++)
if (z*z + Z*Z > 10) break;
printf ("%c", b[k%16]);
}
}
}
=cut
.sub 'main' :main
.local string b
.local int x, y, k
.local num r, i, z, Z, t, c, C
b = " .:,;!/>)|&IH%*#"
y = 30
YREDO: # C = y*0.1 - 1.5
C = y * 0.1
C -= 1.5
x = 0
XREDO: # c = x*0.04 - 2
c = x * 0.04
c -= 2
z = 0
Z = 0
r = c
i = C
k = 0
KREDO: # t = z*z - Z*Z + r
$N1 = z * z
$N2 = Z * Z
t = $N1 - $N2
t += r
# Z = 2*z*Z + i
Z = 2 * Z
Z = z * Z
Z += i
# z = t
z = t
# if (z*z + Z*Z > 10) break;
$N1 = z * z
$N2 = Z * Z
$N1 += $N2
if $N1 > 10 goto PRINT
inc k
if k < 112 goto KREDO
PRINT: $I1 = k % 16
$S1 = substr b, $I1, 1
print $S1
inc x
if x < 75 goto XREDO
print "\n"
dec y
if y > 0 goto YREDO
.end
# Local Variables:
# mode: pir
# fill-column: 100
# End:
# vim: expandtab shiftwidth=4 ft=pir:
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