This script takes a jpg, and breaks it into tiles. You can set the tile size, and everything else is automatic. It will create the tiles,
and a sample html page. Imager works better than GD on jpgs,
and I use jpgs because they are smaller. The script could be easily modified to do any other extension which Imager supports. You can see a sample clickable map
here and a demonstration of GD's problem can be seen
at this node#!/usr/bin/perl
use warnings;
use strict;
use Imager;
my $file = shift || die "need filename\n";
my $tempname = $file;
$tempname =~ s/^(.+)(\.\w+)$/$1/;
print "$tempname\n";
#set tile size adjustment
my $x = 100;
my $y = 100;
my $image = Imager->new();
$image->open(file=>$file, type=>'jpeg') or die $image->errstr();
my $width = $image->getwidth();
my $height = $image->getheight();
print "width->$width height->$height\n";
my $rows = int($height/$y +1) - 1; #make it 0 based
my $cols = int($width/$x + 1) - 1;
print "rows->$rows cols->$cols\n";
foreach my $row(0..$rows){
foreach my $col(0..$cols){
my $imageout = Imager->new(xsize=>$x, ysize=>$y, type=>'direct')
+;
$imageout = $image->crop(left=>$col*$y, right=>$col*$y+$y,
top=>$row*$x, bottom=>$row*$x+$x);
my $tilename = $tempname .'-'.$row.'-'.$col.'.jpg';
$imageout->write(file=>$tilename, type=>'jpeg')
or die "Cannot write: ",$imageout->errstr;
}
}
######################################################################
+
#make an html page with tiles reassembled and clickable
open(HT,">$tempname-jpg.html") or warn $!;
print HT "<html><body><h1>$tempname.jpg</h1>";
print HT "<table border=0 cellspacing=0 cellpadding=0>";
#putting border=0 in the IMG<> makes it seemless
#I have border=1 for demonstration
foreach my $row(0..$rows){
print HT "<tr>";
foreach my $col(0..$cols){
print HT "<td><a href= $tempname-$row-$col.html>
<IMG SRC=$tempname-$row-$col.jpg border=1 HEIGHT=$y
+ WIDTH=$x
alt=$tempname-$row-$col.jpg></a></td>"
}
print HT "</tr>";
}
print HT "</table></body></html>";