egroupware/calendar/inc/round_corners.php

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<?php
/**
* eGroupWare Calendar: rounded corners
*
* @link http://www.egroupware.org
* @author Ralf Becker <RalfBecker-AT-outdoor-training.de>
* @package calendar
* @copyright (c) 2004-9 by Ralf Becker <RalfBecker-AT-outdoor-training.de>
* @license http://opensource.org/licenses/gpl-license.php GPL - GNU General Public License
* @version $Id$
*/
include_once('../../phpgwapi/inc/common_functions.inc.php');
check_load_extension('gd',true); // true = throw exception if not loadable
foreach(array('width'=>-20,'height'=>40,'border'=>1,'color'=>'000080','bgcolor'=>'0000FF') as $name => $default)
{
$$name = isset($_GET[$name]) ? $_GET[$name] : $default;
}
$image = @imagecreate(abs($width),abs($height))
or die("Cannot Initialize new GD image stream");
$white = imagecolorallocate($image, 254, 254, 254);
imagecolortransparent($image, $white);
foreach(array('color','bgcolor') as $name)
{
preg_match('/^#?([0-9A-Fa-f]{2})([0-9A-Fa-f]{2})([0-9A-Fa-f]{2})$/',$$name,$rgb) or
die("Wrong value '".htmlspecialchars($$name)."' for $name, should be something like #80FFFF' !!!");
$$name = imagecolorallocate($image,hexdec($rgb[1]),hexdec($rgb[2]),hexdec($rgb[3]));
}
$radius = min(abs($width),abs($height));
$center_x = $width > 0 ? abs($width)-$radius-1 : $radius;
$center_y = $height < 0 ? abs($height)-$radius-1 : $radius;
//echo "width=$width, height=$height => radius=$radius: center_x=$center_x, center_y=$center_y";
if ($border) imagefilledellipse($image,$center_x,$center_y,2*$radius,2*$radius,$color);
imagefilledellipse($image,$center_x,$center_y,2*($radius-$border),2*($radius-$border),$bgcolor);
if (abs($height) > abs($width))
{
if ($height < 0) // lower corners
{
$y1 = 0;
$y2 = abs($height)-$radius-1;
}
else
{
$y1 = $radius;
$y2 = abs($height)-1;
}
imagefilledrectangle($image,0,$y1,abs($width),$y2,$bgcolor);
if ($border)
{
$x1 = $width < 0 ? 0 : abs($width)-$border;
$x2 = $width < 0 ? $border-1 : abs($width)-1;
imagefilledrectangle($image,$x1,$y1,$x2,$y2,$color);
}
}
session_cache_limiter('public'); // allow caching
if (function_exists('imagegif'))
{
header("Content-type: image/gif");
imagegif($image);
}
else
{
header("Content-type: image/png");
imagepng($image);
}
imagedestroy($image);