Not terribly good ASCII art, but another fun principle that I don't think I've seen used before (though I'm sure I'll be corrected if wrong :)). All analysis and suggestions for improvement / golfing most welcome.

for(2424832,201326592,203754496,2427941,50987779,117900295,151259139,
134613253,51317003,152306448,101778958,152371989,51905302,68813593,688
+14358,
152896285,102827550,153223970){($x,$y,$v,$w)=unpack"c*",pack"l",$_;$e=
+$v-$x;
$g=$w-$y;$h=abs$e;$k=abs$g;$d=$h>$k;for(0..(($d)?$h:$k)){$f+=$d?$g/$e:
+$e/$g;
$f1=$f;int$f&&do{$y+=$d?$g>0?1:-1:0;$x+=$d?0:$e>0?1:-1;$f+=$f>0?-1:1};
$c[$y]||=' 'x 60;substr($c[$y],$x+1,1)=abs$f1>=1?$f1>0?"\\":"/":$d?"-"
+:"|";
$d?($x+=$e>0?1:-1):($y+=$g>0?1:-1);}};$"="\n";print"@c";
[download]

Cheers, Ben.

update Removed all those brackets left over from starting life as a C coder :)
update Stripped a few spare vars etc.

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