mirror of
https://github.com/EGroupware/egroupware.git
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85 lines
2.5 KiB
PHP
85 lines
2.5 KiB
PHP
<?php
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/**************************************************************************\
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* eGroupWare - calendar: rounded corners *
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* http://www.egroupware.org *
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* Written by RalfBecker@outdoor-training.de *
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* -------------------------------------------- *
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* This program is free software; you can redistribute it and/or modify it *
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* under the terms of the GNU General Public License as published by the *
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* Free Software Foundation; either version 2 of the License, or (at your *
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* option) any later version. *
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\**************************************************************************/
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/* $Id$ */
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// some constanst for pre php4.3
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if (!defined('PHP_SHLIB_SUFFIX'))
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{
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define('PHP_SHLIB_SUFFIX',strtoupper(substr(PHP_OS, 0,3)) == 'WIN' ? 'dll' : 'so');
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}
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if (!defined('PHP_SHLIB_PREFIX'))
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{
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define('PHP_SHLIB_PREFIX',PHP_SHLIB_SUFFIX == 'dll' ? 'php_' : '');
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}
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if (!extension_loaded('gd') && !@dl(PHP_SHLIB_PREFIX.'gd.'.PHP_SHLIB_SUFFIX))
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{
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die("Can't load the needed php-extension 'gd' !!!");
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}
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foreach(array('width'=>1,'height'=>1,'color1'=>'000080','color2'=>'ffffff') as $name => $default)
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{
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$$name = isset($_GET[$name]) ? $_GET[$name] : $default;
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}
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foreach(array('color1','color2') as $name)
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{
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preg_match('/^#?([0-9A-Fa-f]{2})([0-9A-Fa-f]{2})([0-9A-Fa-f]{2})$/',$$name,$rgb) or
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die("Wrong value '".$$name."' for $name, should be something like #80FFFF' !!!");
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$$name = array('r'=>hexdec($rgb[1]),'g'=>hexdec($rgb[2]),'b'=>hexdec($rgb[3]));
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}
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$image = @imagecreate(abs($width),abs($height))
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or die("Cannot Initialize new GD image stream");
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$length = max($width,$height);
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$dist = $length / 256;
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if ($dist < 1) $dist = 1;
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$anz = round($length / $dist);
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foreach ($color1 as $c => $val)
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{
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$c_step[$c] = ($color2[$c] - $val) / $anz;
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}
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$rgb = $color1;
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for ($l = 0; $l < $length; $l += $dist)
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{
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$color = imagecolorallocate($image,(int)$rgb['r'],(int)$rgb['g'],(int)$rgb['b']);
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foreach($rgb as $c => $val)
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{
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$rgb[$c] += $c_step[$c];
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}
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if ($width > $height)
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{
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imagefilledrectangle($image,(int)$l,0,(int) ($l+$dist),$height-1,$color);
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}
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else
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{
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imagefilledrectangle($image,0,(int)$l,$width-1,(int) ($l+$dist),$color);
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}
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}
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session_cache_limiter('public'); // allow caching
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if (function_exists('imagegif'))
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{
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header("Content-type: image/gif");
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imagegif($image);
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}
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else
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{
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header("Content-type: image/png");
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imagepng($image);
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}
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imagedestroy($image);
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?>
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