#!/usr/bin/env perl

use strict;

if ($ARGV[0] eq "" || $ARGV[0] =~ /^--?[hH](elp)?$/) {
   die ("USAGE: perl mergeface.pl x y name number\n\n"
       ."x and y are the number of tiles in x and y direction\n"
       ."name is the part before the .base.xyz.png\n"
       ."number is the yz of the .xyz.png\n")
}

my ($x, $y, $name, $nr) = @ARGV;
my $xsize = $x * 32;
my $ysize = $y * 32;

my @chars;
my @tuples;

my $c = 1;
for (my $i = 0; $i < $y; $i++) {
   for (my $j = 0; $j < $x; $j++) {
      push @chars, $c < 10 ? $c++ : chr $c++ + 55;
      push @tuples, "$j,$i";
   }
}

#print join "\n", @chars;
#print join "\n", @tuples;

$x *= 32;
$y *= 32;
my $cmd = "convert -size $x\170$y xc:none ";

$c = 0;
for my $tuple (@tuples) {
   ($x, $y) = split /,/, $tuple;
   $x *= 32;
   $y *= 32;
   $cmd .= "-draw \"image over $x,$y 0,0 \'$name.base.".$chars[$c++]."$nr.png\'\" "
      if $chars[$c];
}

$cmd .= "$name.base.x$nr.png\n";

system($cmd);