#!/usr/local/bin/perl

$GS = "/usr/local/bin/gs";

$| = 1;
print "Content-type: image/gif", "\n\n";

($seconds, $minutes, $hour) = localtime (time);

$x = $y = 150;
open (GS, "|$GS -sDEVICE=gif8 -sOutputFile=- -q -g${x}x${y} - 2> /dev/null");

print GS <<End_of_PostScript_Code;

    %!PS-Adobe-3.0 EPSF-3.0
    %%BoundingBox: 0 0 $x $y
    %%EndComments

    /max_length    $x def
    /line_size      1.5 def
    /marker         5 def
    /origin        {0 dup} def
    /center        {max_length 2 div} def
    /radius        center def
    /hour_segment    {0.50 radius mul} def
    /minute_segment    {0.80 radius mul} def

    /red        {1 0 0 setrgbcolor} def
    /green        {0 1 0 setrgbcolor} def
    /blue        {0 0 1 setrgbcolor} def
    /black        {0 0 0 setrgbcolor} def

    /hour_angle {
        $hour $minutes 60 div add 3 sub 30 mul
        neg
    } def

    /minute_angle {
        $minutes $seconds 60 div add 15 sub 6 mul
        neg
    } def

    center dup translate
    black clippath fill
    line_size setlinewidth
    origin radius 0 360 arc blue stroke

    gsave
    1 1 12 {
        pop
        radius marker sub 0 moveto 
        marker 0 rlineto red stroke
        30 rotate
    } for
    grestore

    origin moveto
    hour_segment hour_angle cos mul
    hour_segment hour_angle sin mul 
    lineto green stroke

    origin moveto
    minute_segment minute_angle cos mul
    minute_segment minute_angle sin mul
    lineto green stroke

    origin line_size 2 mul 0 360 arc red fill

    showpage

End_of_PostScript_Code
    
close (GS);
exit(0);