This is a little module that makes a page with any piece of text or code, coloring it in using a logo or image. I started programming this because I was too lazy to make it character by character. When it was done, it wasn't that hard to make it work for any image or logo.
package EasterRock;
use strict;
use LWP::Simple;
use GD;
use HTML::Entities;
# How to use this module:
#
# my $rock = EasterRock->new();
# $rock->setTextSource($textSource); # pass a URL
# $rock->setImageSource($imageSource); # pass a URL (jpg or png)
# print $rock->getRock('html'); # html, style, div or config
# variables that need a default value
my $_textSource = 'http://www.nu.nl';
my $_imageSource = 'http://juerd.nl/jn/onion.png';
my $_rockHeight = 60;
# variables you could fill youself
my $_backgroundColor = '';
my $_characterAspectratio = 1.8; # 2.0 = (line)heigth is twice the
+(character)width
# variables the program will fill
my $_textBuffer = '';
my $_rockWidth = 60;
my $_sourceImageObject;
my $_patternImageObject;
my $_imageAspectratio = 1;
sub new {
my $class = shift;
my $self = {};
return bless $self, $class;
}
sub setTextSource {
my $self = shift;
$_textSource = shift;
}
sub setImageSource {
my $self = shift;
$_imageSource = shift;
}
sub loadText {
my $self = shift;
$_textBuffer = shift || get($_textSource); # read a URL using LPW
$_textBuffer =~ s/[\n\t\s]//g; # get rid of spaces and stuff..
+.
}
sub getLine {
$_textBuffer =~ m/^(.{$_rockWidth})(.*)$/;
$_textBuffer = $2;
return $1;
}
sub loadImage {
my $self = shift;
if ($_imageSource =~ m/^http.*/i ) {
my $image_web = get($_imageSource);
$_sourceImageObject = GD::Image->newFromJpegData($image_web) i
+f ($_imageSource =~ m/.*jpg$/i );
$_sourceImageObject = GD::Image->newFromGifData($image_web) if
+ ($_imageSource =~ m/.*gif$/i );
$_sourceImageObject = GD::Image->newFromPngData($image_web) if
+ ($_imageSource =~ m/.*png$/i );
}
else {
$_sourceImageObject = GD::Image->newFromJpeg($_imageSource) if
+ ($_imageSource =~ m/.*jpg$/i );
$_sourceImageObject = GD::Image->newFromGif($_imageSource) if
+ ($_imageSource =~ m/.*gif$/i );
$_sourceImageObject = GD::Image->newFromPng($_imageSource) if
+ ($_imageSource =~ m/.*png$/i );
}
if (!$_sourceImageObject) { die("loadImage() did not work out... (
+gif could be a problem)\n"); }
my ($width,$height) = $_sourceImageObject->getBounds();
$_imageAspectratio = $height / $width;
}
sub getPixelColor {
my $self = shift;
my ($x, $y) = @_;
my $index = $_patternImageObject->getPixel($x,$y);
my ($r,$g,$b) = $_patternImageObject->rgb($index);
return "rgb($r,$g,$b)";
}
sub adjustRockWidth {
# here we use the aspectratio of the characters and
# the aspectratio of the image to calculate the character width
$_rockWidth = int(($_rockHeight / $_imageAspectratio) * $_characte
+rAspectratio);
if ($_rockWidth > 4*$_rockHeight) {
$_rockHeight = int($_rockHeight / 2 );
$_rockWidth = int(($_rockHeight / $_imageAspectratio) * $_char
+acterAspectratio);
}
}
sub resizeImage {
# resize The image to match columns and rows
$_patternImageObject = new GD::Image($_rockWidth,$_rockHeight);
my ($width,$height) = $_sourceImageObject->getBounds();
$_patternImageObject->copyResized($_sourceImageObject,0,0,0,0,$_ro
+ckWidth,$_rockHeight,$width,$height);
}
sub getRockHtml {
my $self = shift;
my $_style = shift;
my $_code = shift;
return qq|<html><head><meta http-equiv="Content-type" content="tex
+t/html; charset=utf-8"><title>Easter Rock</title>$_style</head><body
+id="thePage">$_code</body></html>|;
}
sub getRockStyle {
my $self = shift;
if ($_backgroundColor eq '') {
$_backgroundColor = $self->getPixelColor(1,1);
}
my $output = qq|<style type="text/css" media="screen">body { margi
+n: 0; padding: 0; background-color: $_backgroundColor; } #theText { m
+argin: 0; padding: 0; overflow: hidden; font-family: monospace; font-
+size: 10px; line-height: 10px; color: black; } </style>|;
return $output;
}
sub getRock {
my $self = shift;
my $format = shift || 'html'; # html, style, div or config
$self->loadText;
$self->loadImage;
$self->adjustRockWidth;
$self->resizeImage;
my $debuglog = '';
$debuglog .= qq|We are going to build for $_rockWidth x $_rockHeig
+ht characters. \n|;
$debuglog .= qq|The aspectratio of a character is $_characterAspec
+tratio. \n|;
$debuglog .= qq|The aspectratio of the source image is $_imageAspe
+ctratio. \n|;
my ($width,$height) = $_patternImageObject->getBounds();
$debuglog .= qq|The pattern image is $width x $height pixels. \n|;
+
if ($format eq 'config') { return $debuglog; }
my $_style = $self->getRockStyle;
if ($format eq 'style') { return $_style; }
my $_code = '';
for (my $i=0; $i<$_rockHeight; $i++) {
my @letters = split(//, $self->getLine);
for (my $j=0; $j<$_rockWidth; $j++) {
my $color = $self->getPixelColor($j,$i);
my $letter = ($_backgroundColor eq $color) ? ' ' : en
+code_entities($letters[$j]);
while (($j+1)<$_rockWidth && $self->getPixelColor($j,$i) e
+q $color) {
$j++;
$letter .= ($_backgroundColor eq $color) ? ' ' :
+encode_entities($letters[$j]);
}
$_code .= qq|<span style="color: $color">$letter</span>|;
}
$_code .= qq|<br />|;
}
$_code = qq|<div id="theText">$_code</div>|;
if ($format eq 'div') { return $_code; }
return $self->getRockHtml($_style, $_code);
}
1;
