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<?php |
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namespace Nip\Utility; |
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/** |
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* Class Colors |
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* @package Nip\Utility |
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*/ |
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class Colors |
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{ |
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/** |
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* @return mixed |
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*/ |
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public static function colors() |
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{ |
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static $colors = null; |
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if ($colors === null) { |
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$colors = require dirname(__DIR__) . DIRECTORY_SEPARATOR . 'data' . DIRECTORY_SEPARATOR . 'colors.php'; |
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} |
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return $colors; |
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} |
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/** |
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* @param $color |
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* @return array |
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*/ |
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public static function rgb($color) |
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{ |
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$red = substr($color, 1, 2); |
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$green = substr($color, 3, 2); |
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$blue = substr($color, 5, 2); |
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$red = hexdec($red); |
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$green = hexdec($green); |
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$blue = hexdec($blue); |
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return [$red, $green, $blue]; |
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} |
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/** |
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* @param string $color |
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* @return array |
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*/ |
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public static function hsl($color) |
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{ |
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list($red, $green, $blue) = static::rgb($color); |
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$red /= 255; |
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$green /= 255; |
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$blue /= 255; |
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$min = min([$red, min([$green, $blue])]); |
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$max = max([$red, max([$green, $blue])]); |
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$delta = $max - $min; |
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$lightness = ($min + $max) / 2; |
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$saturation = 0; |
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if ($lightness > 0 && $lightness < 1) { |
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$saturation = $delta / ($lightness < 0.5 ? (2 * $lightness) : 2 - (2 * $lightness)); |
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} |
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$hue = 0; |
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if ($delta > 0) { |
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if ($max == $red && $max != $green) { |
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$hue += ($green - $blue) / $delta; |
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} |
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if ($max == $green && $max != $blue) { |
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$hue += (2 + ($blue - $red) / $delta); |
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} |
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if ($max == $blue && $max != $red) { |
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$hue += (4 + ($red - $green) / $delta); |
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} |
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$hue /= 6; |
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} |
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$hue *= 255; |
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$saturation *= 255; |
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$lightness *= 255; |
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return [floor($hue), floor($saturation), floor($lightness)]; |
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} |
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/** |
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* @param $color |
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* @return array|bool |
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*/ |
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public static function name($color) |
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{ |
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$color = strtoupper($color); |
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if (strlen($color) < 3 || strlen($color) > 7) { |
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return false; |
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} |
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if (strlen($color) % 3 == 0) { |
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$color = '#' . $color; |
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} |
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if (strlen($color) == 4) { |
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$color = '#' . $color[1] . $color[1] . $color[2] . $color[2] . $color[3] . $color[3]; |
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} |
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list($red, $green, $blue) = static::rgb($color); |
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list($h, $s, $l) = static::hsl($color); |
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$ndf1 = 0; |
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$ndf2 = 0; |
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$ndf = 0; |
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$cl = -1; |
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$df = -1; |
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$count = count(static::colors()); |
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$colors = static::colors(); |
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for ($index = 0; $index < $count; $index++) { |
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if ($color == '#' . $colors[$index][0]) { |
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return ['#' . $colors[$index][0], $colors[$index][1], true]; |
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} |
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$ndf1 = pow($red - $colors[$index][2], 2) + pow( |
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$green - $colors[$index][3], |
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) + pow($blue - $colors[$index][4], 2); |
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$ndf2 = abs(pow($h - $colors[$index][5], 2)) + pow( |
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$s - $colors[$index][6], |
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) + abs(pow($l - $colors[$index][7], 2)); |
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$ndf = $ndf1 + $ndf2 * 2; |
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if ($df < 0 || $df > $ndf) { |
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$df = $ndf; |
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$cl = $index; |
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} |
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} |
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return $cl < 0 ? false : ["#" . static::colors()[$cl][0], static::colors()[$cl][1], false]; |
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} |
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/** |
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* Uses luminosity to calculate the difference between the given colors. |
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* The returned value should be bigger than 5 for best readability. |
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* |
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* @param string|array $color1 |
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* @param string|array $color2 |
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* @return double |
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*/ |
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public static function lumDiff($color1, $color2) |
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{ |
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list($red1, $green1, $blue1) = is_array($color1) ? $color1 : static::rgb($color1); |
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list($red2, $green2, $blue2) = is_array($color2) ? $color2 : static::rgb($color2); |
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$lightness1 = 0.2126 * pow($red1 / 255, 2.2) + |
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0.7152 * pow($green1 / 255, 2.2) + |
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0.0722 * pow($blue1 / 255, 2.2); |
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$lightness2 = 0.2126 * pow($red2 / 255, 2.2) + |
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0.7152 * pow($green2 / 255, 2.2) + |
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0.0722 * pow($blue2 / 255, 2.2); |
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if ($lightness1 > $lightness2) { |
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return ($lightness1 + 0.05) / ($lightness2 + 0.05); |
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} else { |
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return ($lightness2 + 0.05) / ($lightness1 + 0.05); |
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} |
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} |
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} |
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bytic /
utility
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