<?php
/**
*
* @package VC
* @version $Id: captcha_gd.php 8479 2008-03-29 00:22:48Z naderman $
* @copyright (c) 2006 phpBB Group
* @license http://opensource.org/licenses/gpl-license.php GNU Public License
*
*/
/**
* @ignore
*/
if (!defined('IN_PHPBB'))
{
exit;
}
/**
* Original Author - Xore (Robert Hetzler)
* With contributions from Neothermic
*
* @package VC
*/
class captcha
{
var $width = 360;
var $height = 96;
/**
* Create the image containing $code with a seed of $seed
*/
function execute($code, $seed)
{
global $config;
srand($seed);
mt_srand($seed);
// Create image
$img = imagecreatetruecolor($this->width, $this->height);
// Generate colours
$colour = new colour_manager($img, array(
'random' => true,
'min_value' => 60,
), 'hsv');
$scheme = $colour->colour_scheme('background', false);
$scheme = $colour->mono_range($scheme, 10, false);
shuffle($scheme);
$bg_colours = array_splice($scheme, mt_rand(6, 12));
// Generate code characters
$characters = $sizes = $bounding_boxes = array();
$width_avail = $this->width - 15;
$code_len = strlen($code);
$captcha_bitmaps = $this->captcha_bitmaps();
for ($i = 0; $i < $code_len; ++$i)
{
$characters[$i] = new char_cube3d($captcha_bitmaps, $code[$i]);
list($min, $max) = $characters[$i]->range();
$sizes[$i] = mt_rand($min, $max);
$box = $characters[$i]->dimensions($sizes[$i]);
$width_avail -= ($box[2] - $box[0]);
$bounding_boxes[$i] = $box;
}
// Redistribute leftover x-space
$offset = array();
for ($i = 0; $i < $code_len; ++$i)
{
$denom = ($code_len - $i);
$denom = max(1.3, $denom);
$offset[$i] = mt_rand(0, (1.5 * $width_avail) / $denom);
$width_avail -= $offset[$i];
}
if ($config['captcha_gd_x_grid'])
{
$grid = (int) $config['captcha_gd_x_grid'];
for ($y = 0; $y < $this->height; $y += mt_rand($grid - 2, $grid + 2))
{
$current_colour = $scheme[array_rand($scheme)];
imageline($img, mt_rand(0,4), mt_rand($y - 3, $y), mt_rand($this->width - 5, $this->width), mt_rand($y - 3, $y), $current_colour);
}
}
if ($config['captcha_gd_y_grid'])
{
$grid = (int) $config['captcha_gd_y_grid'];
for ($x = 0; $x < $this->width; $x += mt_rand($grid - 2, $grid + 2))
{
$current_colour = $scheme[array_rand($scheme)];
imagedashedline($img, mt_rand($x -3, $x + 3), mt_rand(0, 4), mt_rand($x -3, $x + 3), mt_rand($this->height - 5, $this->height), $current_colour);
}
}
$xoffset = 5;
for ($i = 0; $i < $code_len; ++$i)
{
$dimm = $bounding_boxes[$i];
$xoffset += ($offset[$i] - $dimm[0]);
$yoffset = mt_rand(-$dimm[1], $this->height - $dimm[3]);
$characters[$i]->drawchar($sizes[$i], $xoffset, $yoffset, $img, $colour->get_resource('background'), $scheme);
$xoffset += $dimm[2];
}
if ($config['captcha_gd_foreground_noise'])
{
$this->noise_line($img, 0, 0, $this->width, $this->height, $colour->get_resource('background'), $scheme, $bg_colours);
}
// Send image
header('Content-Type: image/png');
header('Cache-control: no-cache, no-store');
imagepng($img);
imagedestroy($img);
}
/**
* Noise line
*/
function noise_line($img, $min_x, $min_y, $max_x, $max_y, $bg, $font, $non_font)
{
imagesetthickness($img, 2);
$x1 = $min_x;
$x2 = $max_x;
$y1 = $min_y;
$y2 = $min_y;
do
{
$line = array_merge(
array_fill(0, mt_rand(30, 60), $non_font[array_rand($non_font)]),
array_fill(0, mt_rand(30, 60), $bg)
);
imagesetstyle($img, $line);
imageline($img, $x1, $y1, $x2, $y2, IMG_COLOR_STYLED);
$y1 += mt_rand(12, 35);
$y2 += mt_rand(12, 35);
}
while ($y1 < $max_y && $y2 < $max_y);
$x1 = $min_x;
$x2 = $min_x;
$y1 = $min_y;
$y2 = $max_y;
do
{
$line = array_merge(
array_fill(0, mt_rand(30, 60), $non_font[array_rand($non_font)]),
array_fill(0, mt_rand(30, 60), $bg)
);
imagesetstyle($img, $line);
imageline($img, $x1, $y1, $x2, $y2, IMG_COLOR_STYLED);
$x1 += mt_rand(20, 35);
$x2 += mt_rand(20, 35);
}
while ($x1 < $max_x && $x2 < $max_x);
imagesetthickness($img, 1);
}
/**
* Return bitmaps
*/
function captcha_bitmaps()
{
return array(
'width' => 9,
'height' => 15,
'data' => array(
'A' => array(
array(0,0,0,0,1,0,0,0,0),
array(0,0,0,1,0,1,0,0,0),
array(0,0,0,1,0,1,0,0,0),
array(0,0,0,1,0,1,0,0,0),
array(0,0,1,0,0,0,1,0,0),
array(0,0,1,0,0,0,1,0,0),
array(0,0,1,0,0,0,1,0,0),
array(0,1,0,0,0,0,0,1,0),
array(0,1,0,0,0,0,0,1,0),
array(0,1,1,1,1,1,1,1,0),
array(0,1,0,0,0,0,0,1,0),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
),
'B' => array(
array(1,1,1,1,1,1,1,0,0),
array(1,0,0,0,0,0,0,1,0),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,1,0),
array(1,1,1,1,1,1,1,0,0),
array(1,0,0,0,0,0,0,1,0),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,1,0),
array(1,1,1,1,1,1,1,0,0),
),
'C' => array(
array(0,0,1,1,1,1,1,0,0),
array(0,1,0,0,0,0,0,1,0),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,0),
array(1,0,0,0,0,0,0,0,0),
array(1,0,0,0,0,0,0,0,0),
array(1,0,0,0,0,0,0,0,0),
array(1,0,0,0,0,0,0,0,0),
array(1,0,0,0,0,0,0,0,0),
array(1,0,0,0,0,0,0,0,0),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(0,1,0,0,0,0,0,1,0),
array(0,0,1,1,1,1,1,0,0),
),
'D' => array(
array(1,1,1,1,1,1,1,0,0),
array(1,0,0,0,0,0,0,1,0),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,1,0),
array(1,1,1,1,1,1,1,0,0),
),
'E' => array(
array(1,1,1,1,1,1,1,1,1),
array(1,0,0,0,0,0,0,0,0),
array(1,0,0,0,0,0,0,0,0),
array(1,0,0,0,0,0,0,0,0),
array(1,0,0,0,0,0,0,0,0),
array(1,0,0,0,0,0,0,0,0),
array(1,0,0,0,0,0,0,0,0),
array(1,1,1,1,1,1,1,1,0),
array(1,0,0,0,0,0,0,0,0),
array(1,0,0,0,0,0,0,0,0),
array(1,0,0,0,0,0,0,0,0),
array(1,0,0,0,0,0,0,0,0),
array(1,0,0,0,0,0,0,0,0),
array(1,0,0,0,0,0,0,0,0),
array(1,1,1,1,1,1,1,1,1),
),
'F' => array(
array(1,1,1,1,1,1,1,1,1),
array(1,0,0,0,0,0,0,0,0),
array(1,0,0,0,0,0,0,0,0),
array(1,0,0,0,0,0,0,0,0),
array(1,0,0,0,0,0,0,0,0),
array(1,0,0,0,0,0,0,0,0),
array(1,0,0,0,0,0,0,0,0),
array(1,1,1,1,1,1,1,0,0),
array(1,0,0,0,0,0,0,0,0),
array(1,0,0,0,0,0,0,0,0),
array(1,0,0,0,0,0,0,0,0),
array(1,0,0,0,0,0,0,0,0),
array(1,0,0,0,0,0,0,0,0),
array(1,0,0,0,0,0,0,0,0),
array(1,0,0,0,0,0,0,0,0),
),
'G' => array(
array(0,0,1,1,1,1,1,0,0),
array(0,1,0,0,0,0,0,1,0),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,0),
array(1,0,0,0,0,0,0,0,0),
array(1,0,0,0,0,0,0,0,0),
array(1,0,0,0,0,0,0,0,0),
array(1,0,0,0,0,0,0,0,0),
array(1,0,0,0,0,0,1,1,1),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(0,1,0,0,0,0,0,1,0),
array(0,0,1,1,1,1,1,0,0),
),
'H' => array(
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(1,1,1,1,1,1,1,1,1),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
),
'I' => array(
array(1,1,1,1,1,1,1,1,1),
array(0,0,0,0,1,0,0,0,0),
array(0,0,0,0,1,0,0,0,0),
array(0,0,0,0,1,0,0,0,0),
array(0,0,0,0,1,0,0,0,0),
array(0,0,0,0,1,0,0,0,0),
array(0,0,0,0,1,0,0,0,0),
array(0,0,0,0,1,0,0,0,0),
array(0,0,0,0,1,0,0,0,0),
array(0,0,0,0,1,0,0,0,0),
array(0,0,0,0,1,0,0,0,0),
array(0,0,0,0,1,0,0,0,0),
array(0,0,0,0,1,0,0,0,0),
array(0,0,0,0,1,0,0,0,0),
array(1,1,1,1,1,1,1,1,1),
),
'J' => array(
array(1,1,1,1,1,1,1,1,1),
array(0,0,0,0,0,1,0,0,0),
array(0,0,0,0,0,1,0,0,0),
array(0,0,0,0,0,1,0,0,0),
array(0,0,0,0,0,1,0,0,0),
array(0,0,0,0,0,1,0,0,0),
array(0,0,0,0,0,1,0,0,0),
array(0,0,0,0,0,1,0,0,0),
array(0,0,0,0,0,1,0,0,0),
array(0,0,0,0,0,1,0,0,0),
array(0,0,0,0,0,1,0,0,0),
array(1,0,0,0,0,1,0,0,0),
array(1,0,0,0,0,1,0,0,0),
array(0,1,0,0,1,0,0,0,0),
array(0,0,1,1,0,0,0,0,0),
),
'K' => array( // New 'K', supplied by NeoThermic
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,1,0),
array(1,0,0,0,0,0,1,0,0),
array(1,0,0,0,0,1,0,0,0),
array(1,0,0,0,1,0,0,0,0),
array(1,0,0,1,0,0,0,0,0),
array(1,0,1,0,0,0,0,0,0),
array(1,1,0,0,0,0,0,0,0),
array(1,0,1,0,0,0,0,0,0),
array(1,0,0,1,0,0,0,0,0),
array(1,0,0,0,1,0,0,0,0),
array(1,0,0,0,0,1,0,0,0),
array(1,0,0,0,0,0,1,0,0),
array(1,0,0,0,0,0,0,1,0),
array(1,0,0,0,0,0,0,0,1),
),
'L' => array(
array(0,0,0,0,0,0,0,0,0),
array(1,0,0,0,0,0,0,0,0),
array(1,0,0,0,0,0,0,0,0),
array(1,0,0,0,0,0,0,0,0),
array(1,0,0,0,0,0,0,0,0),
array(1,0,0,0,0,0,0,0,0),
array(1,0,0,0,0,0,0,0,0),
array(1,0,0,0,0,0,0,0,0),
array(1,0,0,0,0,0,0,0,0),
array(1,0,0,0,0,0,0,0,0),
array(1,0,0,0,0,0,0,0,0),
array(1,0,0,0,0,0,0,0,0),
array(1,0,0,0,0,0,0,0,0),
array(1,0,0,0,0,0,0,0,0),
array(1,1,1,1,1,1,1,1,1),
),
'M' => array(
array(1,1,0,0,0,0,0,1,1),
array(1,1,0,0,0,0,0,1,1),
array(1,0,1,0,0,0,1,0,1),
array(1,0,1,0,0,0,1,0,1),
array(1,0,1,0,0,0,1,0,1),
array(1,0,0,1,0,1,0,0,1),
array(1,0,0,1,0,1,0,0,1),
array(1,0,0,1,0,1,0,0,1),
array(1,0,0,0,1,0,0,0,1),
array(1,0,0,0,1,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
),
'N' => array(
array(1,1,0,0,0,0,0,0,1),
array(1,1,0,0,0,0,0,0,1),
array(1,0,1,0,0,0,0,0,1),
array(1,0,1,0,0,0,0,0,1),
array(1,0,0,1,0,0,0,0,1),
array(1,0,0,1,0,0,0,0,1),
array(1,0,0,0,1,0,0,0,1),
array(1,0,0,0,1,0,0,0,1),
array(1,0,0,0,1,0,0,0,1),
array(1,0,0,0,0,1,0,0,1),
array(1,0,0,0,0,1,0,0,1),
array(1,0,0,0,0,0,1,0,1),
array(1,0,0,0,0,0,1,0,1),
array(1,0,0,0,0,0,0,1,1),
array(1,0,0,0,0,0,0,1,1),
),
'O' => array(
array(0,0,1,1,1,1,1,0,0),
array(0,1,0,0,0,0,0,1,0),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(0,1,0,0,0,0,0,1,0),
array(0,0,1,1,1,1,1,0,0),
),
'P' => array(
array(1,1,1,1,1,1,1,0,0),
array(1,0,0,0,0,0,0,1,0),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,1,0),
array(1,1,1,1,1,1,1,0,0),
array(1,0,0,0,0,0,0,0,0),
array(1,0,0,0,0,0,0,0,0),
array(1,0,0,0,0,0,0,0,0),
array(1,0,0,0,0,0,0,0,0),
array(1,0,0,0,0,0,0,0,0),
array(1,0,0,0,0,0,0,0,0),
array(1,0,0,0,0,0,0,0,0),
),
'Q' => array(
array(0,0,1,1,1,1,1,0,0),
array(0,1,0,0,0,0,0,1,0),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,1,0,0,1),
array(1,0,0,0,0,0,1,0,1),
array(0,1,0,0,0,0,0,1,0),
array(0,0,1,1,1,1,1,0,1),
),
'R' => array(
array(1,1,1,1,1,1,1,0,0),
array(1,0,0,0,0,0,0,1,0),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,1,0),
array(1,1,1,1,1,1,1,0,0),
array(1,1,1,0,0,0,0,0,0),
array(1,0,0,1,0,0,0,0,0),
array(1,0,0,0,1,0,0,0,0),
array(1,0,0,0,0,1,0,0,0),
array(1,0,0,0,0,0,1,0,0),
array(1,0,0,0,0,0,0,1,0),
array(1,0,0,0,0,0,0,0,1),
),
'S' => array(
array(0,0,1,1,1,1,1,0,0),
array(0,1,0,0,0,0,0,1,0),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,0),
array(1,0,0,0,0,0,0,0,0),
array(1,0,0,0,0,0,0,0,0),
array(0,1,0,0,0,0,0,0,0),
array(0,0,1,1,1,1,1,0,0),
array(0,0,0,0,0,0,0,1,0),
array(0,0,0,0,0,0,0,0,1),
array(0,0,0,0,0,0,0,0,1),
array(0,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(0,1,0,0,0,0,0,1,0),
array(0,0,1,1,1,1,1,0,0),
),
'T' => array(
array(1,1,1,1,1,1,1,1,1),
array(0,0,0,0,1,0,0,0,0),
array(0,0,0,0,1,0,0,0,0),
array(0,0,0,0,1,0,0,0,0),
array(0,0,0,0,1,0,0,0,0),
array(0,0,0,0,1,0,0,0,0),
array(0,0,0,0,1,0,0,0,0),
array(0,0,0,0,1,0,0,0,0),
array(0,0,0,0,1,0,0,0,0),
array(0,0,0,0,1,0,0,0,0),
array(0,0,0,0,1,0,0,0,0),
array(0,0,0,0,1,0,0,0,0),
array(0,0,0,0,1,0,0,0,0),
array(0,0,0,0,1,0,0,0,0),
array(0,0,0,0,1,0,0,0,0),
),
'U' => array(
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(0,1,0,0,0,0,0,1,0),
array(0,0,1,1,1,1,1,0,0),
),
'V' => array(
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(0,1,0,0,0,0,0,1,0),
array(0,1,0,0,0,0,0,1,0),
array(0,1,0,0,0,0,0,1,0),
array(0,0,1,0,0,0,1,0,0),
array(0,0,1,0,0,0,1,0,0),
array(0,0,1,0,0,0,1,0,0),
array(0,0,1,0,0,0,1,0,0),
array(0,0,0,1,0,1,0,0,0),
array(0,0,0,1,0,1,0,0,0),
array(0,0,0,1,0,1,0,0,0),
array(0,0,0,0,1,0,0,0,0),
array(0,0,0,0,1,0,0,0,0),
),
'W' => array( // New 'W', supplied by MHobbit
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,1,0,0,0,1),
array(1,0,0,0,1,0,0,0,1),
array(1,0,0,1,0,1,0,0,1),
array(1,0,0,1,0,1,0,0,1),
array(1,0,0,1,0,1,0,0,1),
array(1,0,1,0,0,0,1,0,1),
array(1,0,1,0,0,0,1,0,1),
array(1,0,1,0,0,0,1,0,1),
array(1,1,0,0,0,0,0,1,1),
array(1,1,0,0,0,0,0,1,1),
),
'X' => array(
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(0,1,0,0,0,0,0,1,0),
array(0,1,0,0,0,0,0,1,0),
array(0,0,1,0,0,0,1,0,0),
array(0,0,0,1,0,1,0,0,0),
array(0,0,0,1,0,1,0,0,0),
array(0,0,0,0,1,0,0,0,0),
array(0,0,0,1,0,1,0,0,0),
array(0,0,0,1,0,1,0,0,0),
array(0,0,1,0,0,0,1,0,0),
array(0,1,0,0,0,0,1,0,0),
array(0,1,0,0,0,0,0,1,0),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
),
'Y' => array(
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(0,1,0,0,0,0,0,1,0),
array(0,1,0,0,0,0,0,1,0),
array(0,0,1,0,0,0,1,0,0),
array(0,0,1,0,0,0,1,0,0),
array(0,0,0,1,0,1,0,0,0),
array(0,0,0,0,1,0,0,0,0),
array(0,0,0,0,1,0,0,0,0),
array(0,0,0,0,1,0,0,0,0),
array(0,0,0,0,1,0,0,0,0),
array(0,0,0,0,1,0,0,0,0),
array(0,0,0,0,1,0,0,0,0),
array(0,0,0,0,1,0,0,0,0),
array(0,0,0,0,1,0,0,0,0),
),
'Z' => array( // New 'Z' supplied by Anon
array(1,1,1,1,1,1,1,1,1),
array(1,0,0,0,0,0,0,0,1),
array(0,0,0,0,0,0,0,0,1),
array(0,0,0,0,0,0,0,1,0),
array(0,0,0,0,0,0,1,0,0),
array(0,0,0,0,0,1,0,0,0),
array(0,0,0,0,0,1,0,0,0),
array(0,0,0,0,1,0,0,0,0),
array(0,0,0,1,0,0,0,0,0),
array(0,0,0,1,0,0,0,0,0),
array(0,0,1,0,0,0,0,0,0),
array(0,1,0,0,0,0,0,0,0),
array(1,0,0,0,0,0,0,0,0),
array(1,0,0,0,0,0,0,0,1),
array(1,1,1,1,1,1,1,1,1),
),
'1' => array(
array(0,0,0,1,1,0,0,0,0),
array(0,0,1,0,1,0,0,0,0),
array(0,1,0,0,1,0,0,0,0),
array(0,0,0,0,1,0,0,0,0),
array(0,0,0,0,1,0,0,0,0),
array(0,0,0,0,1,0,0,0,0),
array(0,0,0,0,1,0,0,0,0),
array(0,0,0,0,1,0,0,0,0),
array(0,0,0,0,1,0,0,0,0),
array(0,0,0,0,1,0,0,0,0),
array(0,0,0,0,1,0,0,0,0),
array(0,0,0,0,1,0,0,0,0),
array(0,0,0,0,1,0,0,0,0),
array(0,0,0,0,1,0,0,0,0),
array(0,1,1,1,1,1,1,1,0),
),
'2' => array( // New '2' supplied by Anon
array(0,0,0,1,1,1,0,0,0),
array(0,0,1,0,0,0,1,0,0),
array(0,1,0,0,0,0,1,1,0),
array(0,0,0,0,0,0,0,0,1),
array(0,0,0,0,0,0,0,0,1),
array(0,0,0,0,0,0,0,1,1),
array(0,0,0,0,0,0,0,1,0),
array(0,0,0,0,0,0,1,0,0),
array(0,0,0,0,0,1,0,0,0),
array(0,0,0,0,1,0,0,0,0),
array(0,0,0,1,0,0,0,0,0),
array(0,0,1,0,0,0,0,0,0),
array(0,1,0,0,0,0,0,0,0),
array(1,1,1,1,1,1,1,1,1),
array(0,0,0,0,0,0,0,0,0),
),
'3' => array(
array(0,0,1,1,1,1,1,0,0),
array(0,1,0,0,0,0,0,1,0),
array(1,0,0,0,0,0,0,0,1),
array(0,0,0,0,0,0,0,0,1),
array(0,0,0,0,0,0,0,0,1),
array(0,0,0,0,0,0,0,0,1),
array(0,0,0,0,0,0,0,1,0),
array(0,0,0,0,0,1,1,0,0),
array(0,0,0,0,0,0,0,1,0),
array(0,0,0,0,0,0,0,0,1),
array(0,0,0,0,0,0,0,0,1),
array(0,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(0,1,0,0,0,0,0,1,0),
array(0,0,1,1,1,1,1,0,0),
),
'4' => array(
array(0,0,0,0,0,0,1,1,0),
array(0,0,0,0,0,1,0,1,0),
array(0,0,0,0,1,0,0,1,0),
array(0,0,0,1,0,0,0,1,0),
array(0,0,1,0,0,0,0,1,0),
array(0,1,0,0,0,0,0,1,0),
array(1,0,0,0,0,0,0,1,0),
array(1,0,0,0,0,0,0,1,0),
array(1,1,1,1,1,1,1,1,1),
array(0,0,0,0,0,0,0,1,0),
array(0,0,0,0,0,0,0,1,0),
array(0,0,0,0,0,0,0,1,0),
array(0,0,0,0,0,0,0,1,0),
array(0,0,0,0,0,0,0,1,0),
array(0,0,0,0,0,0,0,1,0),
),
'5' => array(
array(1,1,1,1,1,1,1,1,1),
array(1,0,0,0,0,0,0,0,0),
array(1,0,0,0,0,0,0,0,0),
array(1,0,0,0,0,0,0,0,0),
array(1,0,0,0,0,0,0,0,0),
array(0,1,0,0,0,0,0,0,0),
array(0,0,1,1,1,1,1,0,0),
array(0,0,0,0,0,0,0,1,0),
array(0,0,0,0,0,0,0,0,1),
array(0,0,0,0,0,0,0,0,1),
array(0,0,0,0,0,0,0,0,1),
array(0,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(0,1,0,0,0,0,0,1,0),
array(0,0,1,1,1,1,1,0,0),
),
'6' => array(
array(0,0,1,1,1,1,1,0,0),
array(0,1,0,0,0,0,0,1,0),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,0),
array(1,0,0,0,0,0,0,0,0),
array(1,0,0,1,1,1,1,0,0),
array(1,0,1,0,0,0,0,1,0),
array(1,1,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(0,1,0,0,0,0,0,1,0),
array(0,0,1,1,1,1,1,0,0),
),
'7' => array(
array(1,1,1,1,1,1,1,1,1),
array(0,0,0,0,0,0,0,0,1),
array(0,0,0,0,0,0,0,1,0),
array(0,0,0,0,0,0,0,1,0),
array(0,0,0,0,0,0,1,0,0),
array(0,0,0,0,0,1,0,0,0),
array(0,0,0,0,0,1,0,0,0),
array(0,0,0,0,1,0,0,0,0),
array(0,0,0,1,0,0,0,0,0),
array(0,0,0,1,0,0,0,0,0),
array(0,0,1,0,0,0,0,0,0),
array(0,1,0,0,0,0,0,0,0),
array(0,1,0,0,0,0,0,0,0),
array(1,0,0,0,0,0,0,0,0),
array(1,0,0,0,0,0,0,0,0),
),
'8' => array(
array(0,0,1,1,1,1,1,0,0),
array(0,1,0,0,0,0,0,1,0),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(0,1,0,0,0,0,0,1,0),
array(0,0,1,1,1,1,1,0,0),
array(0,1,0,0,0,0,0,1,0),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(0,1,0,0,0,0,0,1,0),
array(0,0,1,1,1,1,1,0,0),
),
'9' => array(
array(0,0,1,1,1,1,1,0,0),
array(0,1,0,0,0,0,0,1,0),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,1,1),
array(0,1,0,0,0,0,1,0,1),
array(0,0,1,1,1,1,0,0,1),
array(0,0,0,0,0,0,0,0,1),
array(0,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(1,0,0,0,0,0,0,0,1),
array(0,1,0,0,0,0,0,1,0),
array(0,0,1,1,1,1,1,0,0),
),
)
);
}
}
/**
* @package VC
*/
class char_cube3d
{
var $bitmap;
var $bitmap_width;
var $bitmap_height;
var $basis_matrix = array(array(1, 0, 0), array(0, 1, 0), array(0, 0, 1));
var $abs_x = array(1, 0);
var $abs_y = array(0, 1);
var $x = 0;
var $y = 1;
var $z = 2;
var $letter = '';
/**
*/
function char_cube3d(&$bitmaps, $letter)
{
$this->bitmap = $bitmaps['data'][$letter];
$this->bitmap_width = $bitmaps['width'];
$this->bitmap_height = $bitmaps['height'];
$this->basis_matrix[0][0] = mt_rand(-600, 600);
$this->basis_matrix[0][1] = mt_rand(-600, 600);
$this->basis_matrix[0][2] = (mt_rand(0, 1) * 2000) - 1000;
$this->basis_matrix[1][0] = mt_rand(-1000, 1000);
$this->basis_matrix[1][1] = mt_rand(-1000, 1000);
$this->basis_matrix[1][2] = mt_rand(-1000, 1000);
$this->normalize($this->basis_matrix[0]);
$this->normalize($this->basis_matrix[1]);
$this->basis_matrix[2] = $this->cross_product($this->basis_matrix[0], $this->basis_matrix[1]);
$this->normalize($this->basis_matrix[2]);
// $this->basis_matrix[1] might not be (probably isn't) orthogonal to $basis_matrix[0]
$this->basis_matrix[1] = $this->cross_product($this->basis_matrix[0], $this->basis_matrix[2]);
$this->normalize($this->basis_matrix[1]);
// Make sure our cube is facing into the canvas (assuming +z == in)
for ($i = 0; $i < 3; ++$i)
{
if ($this->basis_matrix[$i][2] < 0)
{
$this->basis_matrix[$i][0] *= -1;
$this->basis_matrix[$i][1] *= -1;
$this->basis_matrix[$i][2] *= -1;
}
}
// Force our "z" basis vector to be the one with greatest absolute z value
$this->x = 0;
$this->y = 1;
$this->z = 2;
// Swap "y" with "z"
if ($this->basis_matrix[1][2] > $this->basis_matrix[2][2])
{
$this->z = 1;
$this->y = 2;
}
// Swap "x" with "z"
if ($this->basis_matrix[0][2] > $this->basis_matrix[$this->z][2])
{
$this->x = $this->z;
$this->z = 0;
}
// Still need to determine which of $x,$y are which.
// wrong orientation if y's y-component is less than it's x-component
// likewise if x's x-component is less than it's y-component
// if they disagree, go with the one with the greater weight difference.
// rotate if positive
$weight = (abs($this->basis_matrix[$this->x][1]) - abs($this->basis_matrix[$this->x][0])) + (abs($this->basis_matrix[$this->y][0]) - abs($this->basis_matrix[$this->y][1]));
// Swap "x" with "y"
if ($weight > 0)
{
list($this->x, $this->y) = array($this->y, $this->x);
}
$this->abs_x = array($this->basis_matrix[$this->x][0], $this->basis_matrix[$this->x][1]);
$this->abs_y = array($this->basis_matrix[$this->y][0], $this->basis_matrix[$this->y][1]);
if ($this->abs_x[0] < 0)
{
$this->abs_x[0] *= -1;
$this->abs_x[1] *= -1;
}
if ($this->abs_y[1] > 0)
{
$this->abs_y[0] *= -1;
$this->abs_y[1] *= -1;
}
$this->letter = $letter;
}
/**
* Draw a character
*/
function drawchar($scale, $xoff, $yoff, $img, $background, $colours)
{
$width = $this->bitmap_width;
$height = $this->bitmap_height;
$bitmap = $this->bitmap;
$colour1 = $colours[array_rand($colours)];
$colour2 = $colours[array_rand($colours)];
$swapx = ($this->basis_matrix[$this->x][0] > 0);
$swapy = ($this->basis_matrix[$this->y][1] < 0);
for ($y = 0; $y < $height; ++$y)
{
for ($x = 0; $x < $width; ++$x)
{
$xp = ($swapx) ? ($width - $x - 1) : $x;
$yp = ($swapy) ? ($height - $y - 1) : $y;
if ($bitmap[$height - $yp - 1][$xp])
{
$dx = $this->scale($this->abs_x, ($xp - ($swapx ? ($width / 2) : ($width / 2) - 1)) * $scale);
$dy = $this->scale($this->abs_y, ($yp - ($swapy ? ($height / 2) : ($height / 2) - 1)) * $scale);
$xo = $xoff + $dx[0] + $dy[0];
$yo = $yoff + $dx[1] + $dy[1];
$origin = array(0, 0, 0);
$xvec = $this->scale($this->basis_matrix[$this->x], $scale);
$yvec = $this->scale($this->basis_matrix[$this->y], $scale);
$face_corner = $this->sum2($xvec, $yvec);
$zvec = $this->scale($this->basis_matrix[$this->z], $scale);
$x_corner = $this->sum2($xvec, $zvec);
$y_corner = $this->sum2($yvec, $zvec);
imagefilledpolygon($img, $this->gen_poly($xo, $yo, $origin, $xvec, $x_corner,$zvec), 4, $colour1);
imagefilledpolygon($img, $this->gen_poly($xo, $yo, $origin, $yvec, $y_corner,$zvec), 4, $colour2);
$face = $this->gen_poly($xo, $yo, $origin, $xvec, $face_corner, $yvec);
imagefilledpolygon($img, $face, 4, $background);
imagepolygon($img, $face, 4, $colour1);
}
}
}
}
/*
* return a roughly acceptable range of sizes for rendering with this texttype
*/
function range()
{
return array(3, 4);
}
/**
* Vector length
*/
function vectorlen($vector)
{
return sqrt(pow($vector[0], 2) + pow($vector[1], 2) + pow($vector[2], 2));
}
/**
* Normalize
*/
function normalize(&$vector, $length = 1)
{
$length = (( $length < 1) ? 1 : $length);
$length /= $this->vectorlen($vector);
$vector[0] *= $length;
$vector[1] *= $length;
$vector[2] *= $length;
}
/**
*/
function cross_product($vector1, $vector2)
{
$retval = array(0, 0, 0);
$retval[0] = (($vector1[1] * $vector2[2]) - ($vector1[2] * $vector2[1]));
$retval[1] = -(($vector1[0] * $vector2[2]) - ($vector1[2] * $vector2[0]));
$retval[2] = (($vector1[0] * $vector2[1]) - ($vector1[1] * $vector2[0]));
return $retval;
}
/**
*/
function sum($vector1, $vector2)
{
return array($vector1[0] + $vector2[0], $vector1[1] + $vector2[1], $vector1[2] + $vector2[2]);
}
/**
*/
function sum2($vector1, $vector2)
{
return array($vector1[0] + $vector2[0], $vector1[1] + $vector2[1]);
}
/**
*/
function scale($vector, $length)
{
if (sizeof($vector) == 2)
{
return array($vector[0] * $length, $vector[1] * $length);
}
return array($vector[0] * $length, $vector[1] * $length, $vector[2] * $length);
}
/**
*/
function gen_poly($xoff, $yoff, &$vec1, &$vec2, &$vec3, &$vec4)
{
$poly = array();
$poly[0] = $xoff + $vec1[0];
$poly[1] = $yoff + $vec1[1];
$poly[2] = $xoff + $vec2[0];
$poly[3] = $yoff + $vec2[1];
$poly[4] = $xoff + $vec3[0];
$poly[5] = $yoff + $vec3[1];
$poly[6] = $xoff + $vec4[0];
$poly[7] = $yoff + $vec4[1];
return $poly;
}
/**
* dimensions
*/
function dimensions($size)
{
$xn = $this->scale($this->basis_matrix[$this->x], -($this->bitmap_width / 2) * $size);
$xp = $this->scale($this->basis_matrix[$this->x], ($this->bitmap_width / 2) * $size);
$yn = $this->scale($this->basis_matrix[$this->y], -($this->bitmap_height / 2) * $size);
$yp = $this->scale($this->basis_matrix[$this->y], ($this->bitmap_height / 2) * $size);
$p = array();
$p[0] = $this->sum2($xn, $yn);
$p[1] = $this->sum2($xp, $yn);
$p[2] = $this->sum2($xp, $yp);
$p[3] = $this->sum2($xn, $yp);
$min_x = $max_x = $p[0][0];
$min_y = $max_y = $p[0][1];
for ($i = 1; $i < 4; ++$i)
{
$min_x = ($min_x > $p[$i][0]) ? $p[$i][0] : $min_x;
$min_y = ($min_y > $p[$i][1]) ? $p[$i][1] : $min_y;
$max_x = ($max_x < $p[$i][0]) ? $p[$i][0] : $max_x;
$max_y = ($max_y < $p[$i][1]) ? $p[$i][1] : $max_y;
}
return array($min_x, $min_y, $max_x, $max_y);
}
}
/**
* @package VC
*/
class colour_manager
{
var $img;
var $mode;
var $colours;
var $named_colours;
/**
* Create the colour manager, link it to the image resource
*/
function colour_manager($img, $background = false, $mode = 'ahsv')
{
$this->img = $img;
$this->mode = $mode;
$this->colours = array();
$this->named_colours = array();
if ($background !== false)
{
$bg = $this->allocate_named('background', $background);
imagefill($this->img, 0, 0, $bg);
}
}
/**
* Lookup a named colour resource
*/
function get_resource($named_colour)
{
if (isset($this->named_colours[$named_colour]))
{
return $this->named_colours[$named_colour];
}
if (isset($this->named_rgb[$named_colour]))
{
return $this->allocate_named($named_colour, $this->named_rgb[$named_colour], 'rgb');
}
return false;
}
/**
* Assign a name to a colour resource
*/
function name_colour($name, $resource)
{
$this->named_colours[$name] = $resource;
}
/**
* names and allocates a colour resource
*/
function allocate_named($name, $colour, $mode = false)
{
$resource = $this->allocate($colour, $mode);
if ($resource !== false)
{
$this->name_colour($name, $resource);
}
return $resource;
}
/**
* allocates a specified colour into the image
*/
function allocate($colour, $mode = false)
{
if ($mode === false)
{
$mode = $this->mode;
}
if (!is_array($colour))
{
if (isset($this->named_rgb[$colour]))
{
return $this->allocate_named($colour, $this->named_rgb[$colour], 'rgb');
}
if (!is_int($colour))
{
return false;
}
$mode = 'rgb';
$colour = array(255 & ($colour >> 16), 255 & ($colour >> 8), 255 & $colour);
}
if (isset($colour['mode']))
{
$mode = $colour['mode'];
unset($colour['mode']);
}
if (isset($colour['random']))
{
unset($colour['random']);
// everything else is params
return $this->random_colour($colour, $mode);
}
$rgb = colour_manager::model_convert($colour, $mode, 'rgb');
$store = ($this->mode == 'rgb') ? $rgb : colour_manager::model_convert($colour, $mode, $this->mode);
$resource = imagecolorallocate($this->img, $rgb[0], $rgb[1], $rgb[2]);
$this->colours[$resource] = $store;
return $resource;
}
/**
* randomly generates a colour, with optional params
*/
function random_colour($params = array(), $mode = false)
{
if ($mode === false)
{
$mode = $this->mode;
}
switch ($mode)
{
case 'rgb':
// @TODO random rgb generation. do we intend to do this, or is it just too tedious?
break;
case 'ahsv':
case 'hsv':
default:
$default_params = array(
'hue_bias' => false, // degree / 'r'/'g'/'b'/'c'/'m'/'y' /'o'
'hue_range' => false, // if hue bias, then difference range +/- from bias
'min_saturation' => 30, // 0 - 100
'max_saturation' => 80, // 0 - 100
'min_value' => 30, // 0 - 100
'max_value' => 80, // 0 - 100
);
$alt = ($mode == 'ahsv') ? true : false;
$params = array_merge($default_params, $params);
$min_hue = 0;
$max_hue = 359;
$min_saturation = max(0, $params['min_saturation']);
$max_saturation = min(100, $params['max_saturation']);
$min_value = max(0, $params['min_value']);
$max_value = min(100, $params['max_value']);
if ($params['hue_bias'] !== false)
{
if (is_numeric($params['hue_bias']))
{
$h = intval($params['hue_bias']) % 360;
}
else
{
switch ($params['hue_bias'])
{
case 'o':
$h = $alt ? 60 : 30;
break;
case 'y':
$h = $alt ? 120 : 60;
break;
case 'g':
$h = $alt ? 180 : 120;
break;
case 'c':
$h = $alt ? 210 : 180;
break;
case 'b':
$h = 240;
break;
case 'm':
$h = 300;
break;
case 'r':
default:
$h = 0;
break;
}
}
$min_hue = $h + 360;
$max_hue = $h + 360;
if ($params['hue_range'])
{
$min_hue -= min(180, $params['hue_range']);
$max_hue += min(180, $params['hue_range']);
}
}
$h = mt_rand($min_hue, $max_hue);
$s = mt_rand($min_saturation, $max_saturation);
$v = mt_rand($min_value, $max_value);
return $this->allocate(array($h, $s, $v), $mode);
break;
}
}
/**
*/
function colour_scheme($resource, $include_original = true)
{
$mode = 'hsv';
if (($pre = $this->get_resource($resource)) !== false)
{
$resource = $pre;
}
$colour = colour_manager::model_convert($this->colours[$resource], $this->mode, $mode);
$results = ($include_original) ? array($resource) : array();
$colour2 = $colour3 = $colour4 = $colour;
$colour2[0] += 150;
$colour3[0] += 180;
$colour4[0] += 210;
$results[] = $this->allocate($colour2, $mode);
$results[] = $this->allocate($colour3, $mode);
$results[] = $this->allocate($colour4, $mode);
return $results;
}
/**
*/
function mono_range($resource, $count = 5, $include_original = true)
{
if (is_array($resource))
{
$results = array();
for ($i = 0, $size = sizeof($resource); $i < $size; ++$i)
{
$results = array_merge($results, $this->mono_range($resource[$i], $count, $include_original));
}
return $results;
}
$mode = (in_array($this->mode, array('hsv', 'ahsv'), true) ? $this->mode : 'ahsv');
if (($pre = $this->get_resource($resource)) !== false)
{
$resource = $pre;
}
$colour = colour_manager::model_convert($this->colours[$resource], $this->mode, $mode);
$results = array();
if ($include_original)
{
$results[] = $resource;
$count--;
}
// This is a hard problem. I chicken out and try to maintain readability at the cost of less randomness.
while ($count > 0)
{
$colour[1] = ($colour[1] + mt_rand(40,60)) % 99;
$colour[2] = ($colour[2] + mt_rand(40,60));
$results[] = $this->allocate($colour, $mode);
$count--;
}
return $results;
}
/**
* Convert from one colour model to another
*/
function model_convert($colour, $from_model, $to_model)
{
if ($from_model == $to_model)
{
return $colour;
}
switch ($to_model)
{
case 'hsv':
switch ($from_model)
{
case 'ahsv':
return colour_manager::ah2h($colour);
break;
case 'rgb':
return colour_manager::rgb2hsv($colour);
break;
}
break;
case 'ahsv':
switch ($from_model)
{
case 'hsv':
return colour_manager::h2ah($colour);
break;
case 'rgb':
return colour_manager::h2ah(colour_manager::rgb2hsv($colour));
break;
}
break;
case 'rgb':
switch ($from_model)
{
case 'hsv':
return colour_manager::hsv2rgb($colour);
break;
case 'ahsv':
return colour_manager::hsv2rgb(colour_manager::ah2h($colour));
break;
}
break;
}
return false;
}
/**
* Slightly altered from wikipedia's algorithm
*/
function hsv2rgb($hsv)
{
colour_manager::normalize_hue($hsv[0]);
$h = $hsv[0];
$s = min(1, max(0, $hsv[1] / 100));
$v = min(1, max(0, $hsv[2] / 100));
// calculate hue sector
$hi = floor($hsv[0] / 60);
// calculate opposite colour
$p = $v * (1 - $s);
// calculate distance between hex vertices
$f = ($h / 60) - $hi;
// coming in or going out?
if (!($hi & 1))
{
$f = 1 - $f;
}
// calculate adjacent colour
$q = $v * (1 - ($f * $s));
switch ($hi)
{
case 0:
$rgb = array($v, $q, $p);
break;
case 1:
$rgb = array($q, $v, $p);
break;
case 2:
$rgb = array($p, $v, $q);
break;
case 3:
$rgb = array($p, $q, $v);
break;
case 4:
$rgb = array($q, $p, $v);
break;
case 5:
$rgb = array($v, $p, $q);
break;
default:
return array(0, 0, 0);
break;
}
return array(255 * $rgb[0], 255 * $rgb[1], 255 * $rgb[2]);
}
/**
* (more than) Slightly altered from wikipedia's algorithm
*/
function rgb2hsv($rgb)
{
$r = min(255, max(0, $rgb[0]));
$g = min(255, max(0, $rgb[1]));
$b = min(255, max(0, $rgb[2]));
$max = max($r, $g, $b);
$min = min($r, $g, $b);
$v = $max / 255;
$s = (!$max) ? 0 : 1 - ($min / $max);
// if max - min is 0, we want hue to be 0 anyway.
$h = $max - $min;
if ($h)
{
switch ($max)
{
case $g:
$h = 120 + (60 * ($b - $r) / $h);
break;
case $b:
$h = 240 + (60 * ($r - $g) / $h);
break;
case $r:
$h = 360 + (60 * ($g - $b) / $h);
break;
}
}
colour_manager::normalize_hue($h);
return array($h, $s * 100, $v * 100);
}
/**
*/
function normalize_hue(&$hue)
{
$hue %= 360;
if ($hue < 0)
{
$hue += 360;
}
}
/**
* Alternate hue to hue
*/
function ah2h($ahue)
{
if (is_array($ahue))
{
$ahue[0] = colour_manager::ah2h($ahue[0]);
return $ahue;
}
colour_manager::normalize_hue($ahue);
// blue through red is already ok
if ($ahue >= 240)
{
return $ahue;
}
// ahue green is at 180
if ($ahue >= 180)
{
// return (240 - (2 * (240 - $ahue)));
return (2 * $ahue) - 240; // equivalent
}
// ahue yellow is at 120 (RYB rather than RGB)
if ($ahue >= 120)
{
return $ahue - 60;
}
return $ahue / 2;
}
/**
* hue to Alternate hue
*/
function h2ah($hue)
{
if (is_array($hue))
{
$hue[0] = colour_manager::h2ah($hue[0]);
return $hue;
}
colour_manager::normalize_hue($hue);
// blue through red is already ok
if ($hue >= 240)
{
return $hue;
}
else if ($hue <= 60)
{
return $hue * 2;
}
else if ($hue <= 120)
{
return $hue + 60;
}
else
{
return ($hue + 240) / 2;
}
}
}
?>