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Diffstat (limited to 'lib/classes/Color.class.php')
| -rw-r--r-- | lib/classes/Color.class.php | 370 |
1 files changed, 0 insertions, 370 deletions
diff --git a/lib/classes/Color.class.php b/lib/classes/Color.class.php deleted file mode 100644 index a9b4506..0000000 --- a/lib/classes/Color.class.php +++ /dev/null @@ -1,370 +0,0 @@ -<?php -/** - * lib/classes/Color.class.php - class to mix colors and convert them between different types - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License as - * published by the Free Software Foundation; either version 2 of - * the License, or (at your option) any later version. - * - * @author Rasmus Fuhse <fuhse@data-quest.de> - * @license http://www.gnu.org/licenses/gpl-2.0.html GPL version 2 - * @category Stud.IP - */ - -/** - * class to mix colors and convert them between different types - * - * @since 2.1 - */ -class Color { - /** - * HTML-4-Standard color-names plus a few additions - * May be expanded in a later version to allow - * X11 color names as described in - * http://en.wikipedia.org/wiki/Web_colors - * - * @var array - */ - static $colorstrings = [ - 'aqua' => [0, 255, 255, 1], - 'azure' => [240, 255, 255, 1], - 'blue' => [0, 0, 255, 1], - 'cyan' => [0, 255, 255, 1], - 'darkblue' => [0, 0, 139, 1], - 'darkred' => [139, 0, 0, 1], - 'gold' => [255, 215, 0, 1], - 'gray' => [128, 128, 128, 1], - 'indigo' => [75, 0, 130, 1], - 'lightsteelblue' => [176, 196, 222, 1], - 'lightyellow' => [255, 255, 224, 1], - 'lime' => [0, 255, 0, 1], - 'magenta' => [255, 0, 255, 1], - 'navy' => [0, 0, 128, 1], - 'olive' => [128, 128, 0, 1], - 'orange' => [255, 165, 0, 1], - 'pink' => [255, 192, 203, 1], - 'red' => [255, 0, 0, 1], - 'purple' => [128, 0, 128, 1], - 'violet' => [238, 130, 238, 1], - 'yellow' => [255, 255, 0, 1], - 'black' => [0, 0, 0, 1], - 'white' => [255, 255, 255, 1] - ]; - - /** - * converts a css-hex-color into a rgba-quadruple - * - * @param string $color the color to be converted - * @return array colors as rgba-quadruple - */ - static function hex2array($color) { - $color = str_replace('#','',$color); - $arr[0] = hexdec(mb_substr($color,0,2)); - $arr[1] = hexdec(mb_substr($color,2,2)); - $arr[2] = hexdec(mb_substr($color,4,2)); - $arr[3] = 1.0; - return $arr; - } - - /** - * converts a css-rgba-color into a rgba-quadruple - * - * @param string $color the color to be converted - * @return array colors as rgba-quadruple - */ - static function rgba2array($color) { - preg_match("/rgba\(\s*(\d+\%?),\s*(\d+\%?),\s*(\d+\%?),\s*(\d*\.?\d*)\s*\)/", $color, $matches); - array_shift($matches); - $matches[3] = floatval($matches[3]); - return $matches; - } - - /** - * converts a css-rgb-color into a rgba-quadruple - * - * @param string $color the color to be converted - * @return array colors as rgba-quadruple - */ - static function rgb2array($color) { - preg_match("/rgb\(\s*(\d+\%?),\s*(\d+\%?),\s*(\d+\%?)\s*\)/", $color, $matches); - array_shift($matches); - $matches[3] = 1.0; - return $matches; - } - - /** - * converts a css-hsl-color into a rgba-quadruple - * - * @param string $color the color to be converted - * @return array colors as rgba-quadruple - */ - static function hsl2array($color) { - preg_match("/hsl\(\s*(\d+),\s*(\d+)\%,\s*(\d+)\%\s*\)/", $color, $matches); - array_shift($matches); - $matches[0] %= 360; - $matches[3] = 1.0; - $h = $matches[0]; - $s = $matches[1]; - $l = $matches[2]; - $m2 = ($l <= 0.5) ? $l * ($s + 1) : $l + $s - $l*$s; - $m1 = $l * 2 - $m2; - return [self::_color_hue2rgb($m1, $m2, $h + 0.33333), - self::_color_hue2rgb($m1, $m2, $h), - self::_color_hue2rgb($m1, $m2, $h - 0.33333), - 1.0 - ]; - } - - static private function _color_hue2rgb($m1, $m2, $h) { - $h = ($h < 0) ? $h + 1 : (($h > 1) ? $h - 1 : $h); - if ($h * 6 < 1) return $m1 + ($m2 - $m1) * $h * 6; - if ($h * 2 < 1) return $m2; - if ($h * 3 < 2) return $m1 + ($m2 - $m1) * (0.66666 - $h) * 6; - return $m1; - } - - /** - * Mixes two colors by preferring the first one with $percentOfColor1 percent. - * If color2 is the only color with alpha-chanel, it will return a color - * in the format of color2 else (most of the time) in the format of color1. - * @return string: "#ffffff", "rgb(...)", "rgba(...)" depending on color1 and alpha-chanel - */ - static function mix($color1, $color2, $percentOfColor1 = 50, $f = null) { - $percentOfColor1 = $percentOfColor1 > 100 - ? 100 - : ($percentOfColor1 < 0 ? 0 : $percentOfColor1); - list($color1, $format1) = self::_normalize($color1); - list($color2, $format2) = self::_normalize($color2); - $color_new[0] = floor(($color1[0] * $percentOfColor1 - + $color2[0] * (100 - $percentOfColor1)) / 100); - $color_new[1] = floor(($color1[1] * $percentOfColor1 - + $color2[1] * (100 - $percentOfColor1)) / 100); - $color_new[2] = floor(($color1[2] * $percentOfColor1 - + $color2[2] * (100 - $percentOfColor1)) / 100); - $color_new[3] = ($color1[3] * $percentOfColor1 - + $color2[3] * (100 - $percentOfColor1)) / 100; - $format = ((mb_strpos($format2, "a") !== false) && (mb_strpos($format1, "a") === false)) - ? $format2 - : $format1; - $func = "_array2" . $format; - return self::$func($color_new); - } - - /** - * Sets the opacity for a color. Hue and saturation is kept, but opacity is changed. - * Returns a format with alpha-chanel (rgba or hsla) depending on the given format. - */ - static function opacity($color, $opacity) { - list($color, $format) = self::_normalize($color); - if (in_array($format, ["hex", "rgb"])) { - $format = "rgba"; - } elseif ($format = "hsl") { - $format = "hsla"; - } - $color[3] = floatval($opacity); - $color[3] = $color[3] < 0 ? 0 : ($color[3] > 1 ? 1 : $color[3]); - $func = "_array2" . $format; - return self::$func($color); - } - - /** - * Make the passed color brighter - * - * @author Till Glöggler <tgloeggl@uos.de> - * - * @param string $color any type of css-valid color - * @param int $factor percentage of brightning, 100 for white and 0 for no changes to color - * @return string brightened color in same format as the passed one - */ - static function brighten($color, $factor = 35) { - // convert to color to rgba - list($color, $format) = self::_normalize($color); - if ($factor > 100) { - $factor = 100; - } elseif($factor < 0) { - $factor = 0; - } - - // return the color itself, if the conversion failed - if (!$format) return $color; - - // brighten the color - $color[0] = floor(($color[0] * (100 - $factor) + 255 * $factor) / 100); - $color[1] = floor(($color[1] * (100 - $factor) + 255 * $factor) / 100); - $color[2] = floor(($color[2] * (100 - $factor) + 255 * $factor) / 100); - - // convert the color back (if possible) - $func = "_array2" . $format; - return self::$func($color); - } - - /** - * converts any css-color into a rgba-quadruple - * - * @param string $color the color to be converted - * @return array colors as rgba-quadruple - */ - private static function _normalize($color) { - if ($color[0] === "#") { - $format = "hex"; - $arr = self::hex2array($color); - } elseif (preg_match("/\(.*\)/", $color)) { - $format = mb_substr($color, 0, mb_strpos($color, "(")); - $func = $format."2array"; - $arr = self::$func($color); - } elseif (self::$colorstrings[mb_strtolower($color)]) { - $format = "rgb"; //we don't want colors as strings like "red" - $arr = self::$colorstrings[mb_strtolower($color)]; - } - return [$arr, $format]; - } - - /** - * converts a css-rgba-color into a rgba-quadruple - * - * @param string $color the color to be converted - * @return array colors as rgba-quadruple - */ - static function rgba($color) { - list($arr, $format) = self::_normalize($color); - return self::_array2rgba($arr); - } - - /** - * converts a css-rgb-color into a rgba-quadruple - * - * @param string $color the color to be converted - * @return array colors as rgba-quadruple - */ - static function rgb($color) { - list($arr, $format) = self::_normalize($color); - return self::_array2rgb($arr); - } - - /** - * converts a css-hex-color into a rgba-quadruple - * - * @param string $color the color to be converted - * @return array colors as rgba-quadruple - */ - static function hex($color) { - list($arr, $format) = self::_normalize($color); - return self::_array2hex($arr); - } - - /** - * converts a css-hsl-color into a rgba-quadruple - * - * @param string $color the color to be converted - * @return array colors as rgba-quadruple - */ - static function hsl($color) { - list($arr, $format) = self::_normalize($color); - return self::_array2hsl($arr); - } - - /** - * converts a css-hsla-color into a rgba-quadruple - * - * @param string $color the color to be converted - * @return array colors as rgba-quadruple - */ - static function hsla($color) { - list($arr, $format) = self::_normalize($color); - return self::_array2hsla($arr); - } - - - /** - * converts a rgba-quadruple into a css-hex-color - * - * @param array $arr the rgba-quadruple to be converted - * @return array colors as css-hex - */ - static private function _array2hex($arr) { - return "#" . - ($arr[0] < 16 ? "0" : "").dechex($arr[0]) . - ($arr[1] < 16 ? "0" : "").dechex($arr[1]) . - ($arr[2] < 16 ? "0" : "").dechex($arr[2]); - } - - /** - * converts a rgba-quadruple into a css-rgb-color - * - * @param array $arr the rgba-quadruple to be converted - * @return array colors as css-rgb - */ - static private function _array2rgb($arr) { - array_pop($arr); - return "rgb(".implode(", ", $arr).")"; - } - - /** - * converts a rgba-quadruple into a css-rgba-color - * - * @param array $arr the rgba-quadruple to be converted - * @return array colors as css-rgba - */ - static private function _array2rgba($arr) { - return "rgba(".implode(", ", $arr).")"; - } - - /** - * converts a rgba-quadruple into a css-hsl-color - * - * @param array $arr the rgba-quadruple to be converted - * @return array colors as css-hsl - */ - static private function _array2hsl($arr) { - $arr = self::_calculate_hsl($arr); - return "hsl(".$arr[0].", ".$arr[1]."%, ".$arr[2]."%)"; - } - - /** - * converts a rgba-quadruple into a css-hsla-color - * - * @param array $arr the rgba-quadruple to be converted - * @return array colors as css-hsla - */ - static private function _array2hsla($arr) { - $hsl = self::_calculate_hsl($arr); - return "hsl(".$hsl[0].", ".$hsl[1]."%, ".$hsl[2]."%, ".$arr[3].")"; - } - - static private function _calculate_hsl($arr) { - $clrR = ($arr[0]); - $clrG = ($arr[1]); - $clrB = ($arr[2]); - - $clrMin = min($clrR, $clrG, $clrB); - $clrMax = max($clrR, $clrG, $clrB); - $deltaMax = $clrMax - $clrMin; - - $L = ($clrMax + $clrMin) / 510; - - if (0 == $deltaMax) { - $H = 0; - $S = 0; - } else { - if (0.5 > $L) { - $S = $deltaMax / ($clrMax + $clrMin); - } else { - $S = $deltaMax / (510 - $clrMax - $clrMin); - } - - if ($clrMax == $clrR) { - $H = ($clrG - $clrB) / (6.0 * $deltaMax); - } else if ($clrMax == $clrG) { - $H = 1/3 + ($clrB - $clrR) / (6.0 * $deltaMax); - } else { - $H = 2 / 3 + ($clrR - $clrG) / (6.0 * $deltaMax); - } - - if (0 > $H) $H += 1; - if (1 < $H) $H -= 1; - } - return [$H, $S, $L]; - } - -}
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