/
Color.php
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/
Color.php
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<?php
/* vim: set expandtab tabstop=4 shiftwidth=4: */
/**
* Image_Canvas
*
* Canvas based creation of images to facilitate different output formats
*
* PHP versions 4 and 5
*
* LICENSE: This library is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or (at your
* option) any later version. This library is distributed in the hope that it
* will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
* General Public License for more details. You should have received a copy of
* the GNU Lesser General Public License along with this library; if not, see
* <http://www.gnu.org/licenses/>
*
* @category Images
* @package Image_Canvas
* @author Jesper Veggerby <pear.nosey@veggerby.dk>
* @author Stefan Neufeind <pear.neufeind@speedpartner.de>
* @copyright 2003-2009 The PHP Group
* @license http://www.gnu.org/copyleft/lesser.html LGPL License 2.1
* @version SVN: $Id$
* @link http://pear.php.net/package/Image_Canvas
*/
/**
* Color class to be extended; from package PEAR::Image_Color
*/
require_once 'Image/Color.php';
/**
* Class for color-handling
*
* This is used to extend the functionality of the current PEAR::Image_Color v0.4.
* I hope to be allowed to incorporate some of the improvements in a new Image_Color release.
*
* @author Stefan Neufeind <pear.neufeind@speedpartner.de>
* @package Image_Canvas
* @access public
*/
class Image_Canvas_Color extends Image_Color
{
/**
* Allocates a color in the given image.
*
* Userdefined color specifications get translated into
* an array of rgb values.
*
* @param resource &$img GD-resource
* @param mixed $color Any color representation supported by color2RGB()
*
* @return resource Image color handle
* @see color2RGB()
* @access public
* @static
*/
function allocateColor(&$img, $color)
{
$color = Image_Canvas_Color::color2RGB($color);
if (($color[3] == 255) || (!function_exists("imagecolorallocatealpha"))) {
return imagecolorallocate($img, $color[0], $color[1], $color[2]);
} else {
return imagecolorallocatealpha($img, $color[0], $color[1], $color[2], 127-round(($color[3]*127)/255));
}
}
/**
* Convert any color-representation into an array of 4 ints (RGBA).
*
* Userdefined color specifications get translated into
* an array of rgb values.
*
* @param mixed $color Any color representation supported by Image_Canvas_Color::color2RGB()
*
* @return array Array of 4 ints (RGBA-representation)
* @access public
* @static
*/
function color2RGB($color)
{
if (is_array($color)) {
if (!is_numeric($color[0])) {
return null; // error
}
if (count($color) == 3) { // assume RGB-color
// 255 = alpha-value; full opaque
return array((int) $color[0],
(int) $color[1],
(int) $color[2],
255);
}
if (count($color) == 4) { // assume RGBA-color
// 255 = alpha-value; full opaque
return array((int) $color[0],
(int) $color[1],
(int) $color[2],
(int) $color[3]);
}
return null; // error
} elseif (is_string($color)) {
$alphaPos = strpos($color, '@');
if ($alphaPos === false) {
$alpha = 255;
} else {
$alphaFloat = (float) substr($color, $alphaPos+1);
// restrict to range 0..1
$alphaFloat = max(min($alphaFloat, 1), 0);
$alpha = (int) round((float) 255 * $alphaFloat);
$color = substr($color, 0, $alphaPos);
}
if ($color[0] == '#') { // hex-color given, e.g. #FFB4B4
$tempColor = parent::hex2rgb($color);
return array((int) $tempColor[0],
(int) $tempColor[1],
(int) $tempColor[2],
$alpha);
}
if (strpos($color, '%') !== false) {
$tempColor = parent::percentageColor2RGB($color);
return array((int) $tempColor[0],
(int) $tempColor[1],
(int) $tempColor[2],
$alpha);
} else {
$tempColor = parent::namedColor2RGB($color);
return array((int) $tempColor[0],
(int) $tempColor[1],
(int) $tempColor[2],
$alpha);
}
} else {
return null; // error
}
}
/**
* getRange
* Given a degree, you can get the range of colors between one color and
* another color.
*
* @param string $degrees How much each 'step' between the colors we should take.
*
* @return array Array of all the colors, one element for each color.
* @access public
*/
function getRange ($degrees)
{
$tempColors = parent::getRange($degrees);
// now add alpha-channel information
$steps = count($tempColors);
for ($counter=0;$counter<$steps;$counter++) {
$tempColors[$counter] = parent::hex2rgb($tempColors[$counter]);
unset($tempColors[$counter]['hex']);
$tempColors[$counter][3] = (int) round(
(((float) $this->color1[3]*($steps-$counter))+
((float) $this->color2[3]*($counter))
) / $steps
);
}
return $tempColors;
}
/**
* Internal method to correctly set the colors.
*
* @param mixed $col1 color 1
* @param mixed $col2 color 2
*
* @return void
* @access private
*/
function _setColors ( $col1, $col2 )
{
$this->color1 = Image_Canvas_Color::color2RGB($col1);
$this->color2 = Image_Canvas_Color::color2RGB($col2);
}
}
?>