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<?php namespace Nextend\Framework\Parser; /** * * Color values manipulation utilities. Provides methods to convert from and to * Hex, RGB, HSV and HSL color representattions. * * Several color conversion logic are based on pseudo-code from * http://www.easyrgb.com/math.php * * @category Lux * * @package Lux_Color * * @author Rodrigo Moraes <rodrigo.moraes@gmail.com> * * @license http://www.opensource.org/licenses/bsd-license.php BSD License * * @version $Id$ * */ class Color { public static function colorToRGBA($value) { $rgba = self::hex2rgba($value); return 'RGBA(' . $rgba[0] . ',' . $rgba[1] . ',' . $rgba[2] . ',' . round($rgba[3] / 127, 2) . ')'; } public static function hex2alpha($value) { if (strlen($value) == 6) { return 127; } return intval(hexdec(substr($value, 6, 2)) / 2); } public static function hex2opacity($value) { return self::hex2alpha($value) / 127; } public static function colorToSVG($value) { $rgba = self::hex2rgba($value); return array( substr($value, 0, 6), round($rgba[3] / 127, 2) ); } /** * * Converts hexadecimal colors to RGB. * * @param string $hex Hexadecimal value. Accepts values with 3 or 6 numbers, * with or without #, e.g., CCC, #CCC, CCCCCC or #CCCCCC. * * @return array RGB values: 0 => R, 1 => G, 2 => B * */ public static function hex2rgb($hex) { // Remove #. if (strpos($hex, '#') === 0) { $hex = substr($hex, 1); } if (strlen($hex) == 3) { $hex .= $hex; } if (strlen($hex) != 6) { return false; } // Convert each tuple to decimal. $r = hexdec(substr($hex, 0, 2)); $g = hexdec(substr($hex, 2, 2)); $b = hexdec(substr($hex, 4, 2)); return array( $r, $g, $b ); } public static function hex2rgba($hex) { // Remove #. if (strpos($hex, '#') === 0) { $hex = substr($hex, 1); } if (strlen($hex) == 6) { $hex .= 'ff'; } if (strlen($hex) != 8) { return false; } // Convert each tuple to decimal. $r = hexdec(substr($hex, 0, 2)); $g = hexdec(substr($hex, 2, 2)); $b = hexdec(substr($hex, 4, 2)); $a = intval(hexdec(substr($hex, 6, 2)) / 2); return array( $r, $g, $b, $a ); } public static function hex82hex($hex) { // Remove #. if (strpos($hex, '#') === 0) { $hex = substr($hex, 1); } if (strlen($hex) == 6) { $hex .= 'ff'; } if (strlen($hex) != 8) { return false; } return array( substr($hex, 0, 6), substr($hex, 6, 2) ); } }
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