494 lines
14 KiB
PHP
494 lines
14 KiB
PHP
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<?php
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/**
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* Author: Arlo Carreon <http://arlocarreon.com>
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* Info: http://mexitek.github.io/phpColors/
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* License: http://arlo.mit-license.org/
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*/
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/**
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* A color utility that helps manipulate HEX colors
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*/
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class Color {
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private $_hex;
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private $_hsl;
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private $_rgb;
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/**
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* Auto darkens/lightens by 10% for sexily-subtle gradients.
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* Set this to FALSE to adjust automatic shade to be between given color
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* and black (for darken) or white (for lighten)
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*/
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const DEFAULT_ADJUST = 10;
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/**
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* Instantiates the class with a HEX value
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* @param string $hex
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* @throws Exception "Bad color format"
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*/
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function __construct( $hex ) {
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// Strip # sign is present
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$color = str_replace("#", "", $hex);
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// Make sure it's 6 digits
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if( strlen($color) === 3 ) {
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$color = $color[0].$color[0].$color[1].$color[1].$color[2].$color[2];
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} else if( strlen($color) != 6 ) {
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throw new Exception("HEX color needs to be 6 or 3 digits long");
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}
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$this->_hsl = self::hexToHsl( $color );
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$this->_hex = $color;
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$this->_rgb = self::hexToRgb( $color );
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}
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// ====================
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// = Public Interface =
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// ====================
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/**
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* Given a HEX string returns a HSL array equivalent.
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* @param string $color
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* @return array HSL associative array
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*/
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public static function hexToHsl( $color ){
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// Sanity check
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$color = self::_checkHex($color);
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// Convert HEX to DEC
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$R = hexdec($color[0].$color[1]);
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$G = hexdec($color[2].$color[3]);
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$B = hexdec($color[4].$color[5]);
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$HSL = array();
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$var_R = ($R / 255);
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$var_G = ($G / 255);
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$var_B = ($B / 255);
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$var_Min = min($var_R, $var_G, $var_B);
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$var_Max = max($var_R, $var_G, $var_B);
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$del_Max = $var_Max - $var_Min;
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$L = ($var_Max + $var_Min)/2;
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if ($del_Max == 0)
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{
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$H = 0;
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$S = 0;
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}
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else
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{
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if ( $L < 0.5 ) $S = $del_Max / ( $var_Max + $var_Min );
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else $S = $del_Max / ( 2 - $var_Max - $var_Min );
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$del_R = ( ( ( $var_Max - $var_R ) / 6 ) + ( $del_Max / 2 ) ) / $del_Max;
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$del_G = ( ( ( $var_Max - $var_G ) / 6 ) + ( $del_Max / 2 ) ) / $del_Max;
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$del_B = ( ( ( $var_Max - $var_B ) / 6 ) + ( $del_Max / 2 ) ) / $del_Max;
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if ($var_R == $var_Max) $H = $del_B - $del_G;
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else if ($var_G == $var_Max) $H = ( 1 / 3 ) + $del_R - $del_B;
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else if ($var_B == $var_Max) $H = ( 2 / 3 ) + $del_G - $del_R;
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if ($H<0) $H++;
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if ($H>1) $H--;
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}
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$HSL['H'] = ($H*360);
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$HSL['S'] = $S;
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$HSL['L'] = $L;
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return $HSL;
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}
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/**
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* Given a HSL associative array returns the equivalent HEX string
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* @param array $hsl
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* @return string HEX string
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* @throws Exception "Bad HSL Array"
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*/
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public static function hslToHex( $hsl = array() ){
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// Make sure it's HSL
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if(empty($hsl) || !isset($hsl["H"]) || !isset($hsl["S"]) || !isset($hsl["L"]) ) {
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throw new Exception("Param was not an HSL array");
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}
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list($H,$S,$L) = array( $hsl['H']/360,$hsl['S'],$hsl['L'] );
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if( $S == 0 ) {
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$r = $L * 255;
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$g = $L * 255;
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$b = $L * 255;
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} else {
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if($L<0.5) {
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$var_2 = $L*(1+$S);
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} else {
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$var_2 = ($L+$S) - ($S*$L);
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}
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$var_1 = 2 * $L - $var_2;
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$r = round(255 * self::_huetorgb( $var_1, $var_2, $H + (1/3) ));
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$g = round(255 * self::_huetorgb( $var_1, $var_2, $H ));
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$b = round(255 * self::_huetorgb( $var_1, $var_2, $H - (1/3) ));
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}
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// Convert to hex
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$r = dechex($r);
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$g = dechex($g);
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$b = dechex($b);
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// Make sure we get 2 digits for decimals
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$r = (strlen("".$r)===1) ? "0".$r:$r;
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$g = (strlen("".$g)===1) ? "0".$g:$g;
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$b = (strlen("".$b)===1) ? "0".$b:$b;
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return $r.$g.$b;
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}
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/**
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* Given a HEX string returns a RGB array equivalent.
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* @param string $color
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* @return array RGB associative array
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*/
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public static function hexToRgb( $color ){
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// Sanity check
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$color = self::_checkHex($color);
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// Convert HEX to DEC
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$R = hexdec($color[0].$color[1]);
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$G = hexdec($color[2].$color[3]);
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$B = hexdec($color[4].$color[5]);
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$RGB['R'] = $R;
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$RGB['G'] = $G;
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$RGB['B'] = $B;
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return $RGB;
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}
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/**
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* Given an RGB associative array returns the equivalent HEX string
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* @param array $rgb
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* @return string RGB string
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* @throws Exception "Bad RGB Array"
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*/
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public static function rgbToHex( $rgb = array() ){
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// Make sure it's RGB
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if(empty($rgb) || !isset($rgb["R"]) || !isset($rgb["G"]) || !isset($rgb["B"]) ) {
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throw new Exception("Param was not an RGB array");
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}
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// https://github.com/mexitek/phpColors/issues/25#issuecomment-88354815
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// Convert RGB to HEX
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$hex[0] = str_pad(dechex($rgb['R']), 2, '0', STR_PAD_LEFT);
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$hex[1] = str_pad(dechex($rgb['G']), 2, '0', STR_PAD_LEFT);
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$hex[2] = str_pad(dechex($rgb['B']), 2, '0', STR_PAD_LEFT);
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return implode( '', $hex );
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}
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/**
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* Given a HEX value, returns a darker color. If no desired amount provided, then the color halfway between
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* given HEX and black will be returned.
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* @param int $amount
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* @return string Darker HEX value
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*/
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public function darken( $amount = self::DEFAULT_ADJUST ){
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// Darken
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$darkerHSL = $this->_darken($this->_hsl, $amount);
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// Return as HEX
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return self::hslToHex($darkerHSL);
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}
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/**
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* Given a HEX value, returns a lighter color. If no desired amount provided, then the color halfway between
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* given HEX and white will be returned.
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* @param int $amount
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* @return string Lighter HEX value
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*/
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public function lighten( $amount = self::DEFAULT_ADJUST ){
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// Lighten
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$lighterHSL = $this->_lighten($this->_hsl, $amount);
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// Return as HEX
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return self::hslToHex($lighterHSL);
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}
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/**
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* Given a HEX value, returns a mixed color. If no desired amount provided, then the color mixed by this ratio
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* @param string $hex2 Secondary HEX value to mix with
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* @param int $amount = -100..0..+100
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* @return string mixed HEX value
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*/
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public function mix($hex2, $amount = 0){
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$rgb2 = self::hexToRgb($hex2);
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$mixed = $this->_mix($this->_rgb, $rgb2, $amount);
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// Return as HEX
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return self::rgbToHex($mixed);
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}
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/**
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* Creates an array with two shades that can be used to make a gradient
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* @param int $amount Optional percentage amount you want your contrast color
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* @return array An array with a 'light' and 'dark' index
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*/
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public function makeGradient( $amount = self::DEFAULT_ADJUST ) {
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// Decide which color needs to be made
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if( $this->isLight() ) {
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$lightColor = $this->_hex;
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$darkColor = $this->darken($amount);
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} else {
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$lightColor = $this->lighten($amount);
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$darkColor = $this->_hex;
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}
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// Return our gradient array
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return array( "light" => $lightColor, "dark" => $darkColor );
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}
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/**
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* Returns whether or not given color is considered "light"
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* @param string|Boolean $color
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* @param int $lighterThan
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* @return boolean
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*/
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public function isLight( $color = FALSE, $lighterThan = 130 ){
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// Get our color
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$color = ($color) ? $color : $this->_hex;
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// Calculate straight from rbg
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$r = hexdec($color[0].$color[1]);
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$g = hexdec($color[2].$color[3]);
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$b = hexdec($color[4].$color[5]);
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return (( $r*299 + $g*587 + $b*114 )/1000 > $lighterThan);
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}
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/**
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* Returns whether or not a given color is considered "dark"
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* @param string|Boolean $color
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* @param int $darkerThan
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* @return boolean
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*/
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public function isDark( $color = FALSE, $darkerThan = 130 ){
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// Get our color
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$color = ($color) ? $color:$this->_hex;
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// Calculate straight from rbg
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$r = hexdec($color[0].$color[1]);
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$g = hexdec($color[2].$color[3]);
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$b = hexdec($color[4].$color[5]);
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return (( $r*299 + $g*587 + $b*114 )/1000 <= $darkerThan);
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}
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/**
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* Returns the complimentary color
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* @return string Complementary hex color
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*
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*/
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public function complementary() {
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// Get our HSL
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$hsl = $this->_hsl;
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// Adjust Hue 180 degrees
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$hsl['H'] += ($hsl['H']>180) ? -180:180;
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// Return the new value in HEX
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return self::hslToHex($hsl);
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}
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/**
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* Returns your color's HSL array
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*/
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public function getHsl() {
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return $this->_hsl;
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}
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/**
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* Returns your original color
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*/
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public function getHex() {
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return $this->_hex;
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}
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/**
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* Returns your color's RGB array
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*/
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public function getRgb() {
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return $this->_rgb;
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}
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/**
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* Returns the cross browser CSS3 gradient
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* @param int $amount Optional: percentage amount to light/darken the gradient
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* @param boolean $vintageBrowsers Optional: include vendor prefixes for browsers that almost died out already
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* @param string $prefix Optional: prefix for every lines
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* @param string $suffix Optional: suffix for every lines
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* @link http://caniuse.com/css-gradients Resource for the browser support
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* @return string CSS3 gradient for chrome, safari, firefox, opera and IE10
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*/
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public function getCssGradient( $amount = self::DEFAULT_ADJUST, $vintageBrowsers = FALSE, $suffix = "" , $prefix = "" ) {
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// Get the recommended gradient
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$g = $this->makeGradient($amount);
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$css = "";
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/* fallback/image non-cover color */
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$css .= "{$prefix}background-color: #".$this->_hex.";{$suffix}";
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/* IE Browsers */
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$css .= "{$prefix}filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#".$g['light']."', endColorstr='#".$g['dark']."');{$suffix}";
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/* Safari 4+, Chrome 1-9 */
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if ( $vintageBrowsers ) {
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$css .= "{$prefix}background-image: -webkit-gradient(linear, 0% 0%, 0% 100%, from(#".$g['light']."), to(#".$g['dark']."));{$suffix}";
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}
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/* Safari 5.1+, Mobile Safari, Chrome 10+ */
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$css .= "{$prefix}background-image: -webkit-linear-gradient(top, #".$g['light'].", #".$g['dark'].");{$suffix}";
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/* Firefox 3.6+ */
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if ( $vintageBrowsers ) {
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$css .= "{$prefix}background-image: -moz-linear-gradient(top, #".$g['light'].", #".$g['dark'].");{$suffix}";
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}
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/* Opera 11.10+ */
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if ( $vintageBrowsers ) {
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$css .= "{$prefix}background-image: -o-linear-gradient(top, #".$g['light'].", #".$g['dark'].");{$suffix}";
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}
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/* Unprefixed version (standards): FF 16+, IE10+, Chrome 26+, Safari 7+, Opera 12.1+ */
|
||
|
|
$css .= "{$prefix}background-image: linear-gradient(to bottom, #".$g['light'].", #".$g['dark'].");{$suffix}";
|
||
|
|
|
||
|
|
// Return our CSS
|
||
|
|
return $css;
|
||
|
|
}
|
||
|
|
|
||
|
|
// ===========================
|
||
|
|
// = Private Functions Below =
|
||
|
|
// ===========================
|
||
|
|
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Darkens a given HSL array
|
||
|
|
* @param array $hsl
|
||
|
|
* @param int $amount
|
||
|
|
* @return array $hsl
|
||
|
|
*/
|
||
|
|
private function _darken( $hsl, $amount = self::DEFAULT_ADJUST){
|
||
|
|
// Check if we were provided a number
|
||
|
|
if( $amount ) {
|
||
|
|
$hsl['L'] = ($hsl['L'] * 100) - $amount;
|
||
|
|
$hsl['L'] = ($hsl['L'] < 0) ? 0:$hsl['L']/100;
|
||
|
|
} else {
|
||
|
|
// We need to find out how much to darken
|
||
|
|
$hsl['L'] = $hsl['L']/2 ;
|
||
|
|
}
|
||
|
|
|
||
|
|
return $hsl;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Lightens a given HSL array
|
||
|
|
* @param array $hsl
|
||
|
|
* @param int $amount
|
||
|
|
* @return array $hsl
|
||
|
|
*/
|
||
|
|
private function _lighten( $hsl, $amount = self::DEFAULT_ADJUST){
|
||
|
|
// Check if we were provided a number
|
||
|
|
if( $amount ) {
|
||
|
|
$hsl['L'] = ($hsl['L'] * 100) + $amount;
|
||
|
|
$hsl['L'] = ($hsl['L'] > 100) ? 1:$hsl['L']/100;
|
||
|
|
} else {
|
||
|
|
// We need to find out how much to lighten
|
||
|
|
$hsl['L'] += (1-$hsl['L'])/2;
|
||
|
|
}
|
||
|
|
|
||
|
|
return $hsl;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Mix 2 rgb colors and return an rgb color
|
||
|
|
* @param array $rgb1
|
||
|
|
* @param array $rgb2
|
||
|
|
* @param int $amount ranged -100..0..+100
|
||
|
|
* @return array $rgb
|
||
|
|
*
|
||
|
|
* ported from http://phpxref.pagelines.com/nav.html?includes/class.colors.php.source.html
|
||
|
|
*/
|
||
|
|
private function _mix($rgb1, $rgb2, $amount = 0) {
|
||
|
|
|
||
|
|
$r1 = ($amount + 100) / 100;
|
||
|
|
$r2 = 2 - $r1;
|
||
|
|
|
||
|
|
$rmix = (($rgb1['R'] * $r1) + ($rgb2['R'] * $r2)) / 2;
|
||
|
|
$gmix = (($rgb1['G'] * $r1) + ($rgb2['G'] * $r2)) / 2;
|
||
|
|
$bmix = (($rgb1['B'] * $r1) + ($rgb2['B'] * $r2)) / 2;
|
||
|
|
|
||
|
|
return array('R' => $rmix, 'G' => $gmix, 'B' => $bmix);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Given a Hue, returns corresponding RGB value
|
||
|
|
* @param int $v1
|
||
|
|
* @param int $v2
|
||
|
|
* @param int $vH
|
||
|
|
* @return int
|
||
|
|
*/
|
||
|
|
private static function _huetorgb( $v1,$v2,$vH ) {
|
||
|
|
if( $vH < 0 ) {
|
||
|
|
$vH += 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
if( $vH > 1 ) {
|
||
|
|
$vH -= 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
if( (6*$vH) < 1 ) {
|
||
|
|
return ($v1 + ($v2 - $v1) * 6 * $vH);
|
||
|
|
}
|
||
|
|
|
||
|
|
if( (2*$vH) < 1 ) {
|
||
|
|
return $v2;
|
||
|
|
}
|
||
|
|
|
||
|
|
if( (3*$vH) < 2 ) {
|
||
|
|
return ($v1 + ($v2-$v1) * ( (2/3)-$vH ) * 6);
|
||
|
|
}
|
||
|
|
|
||
|
|
return $v1;
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* You need to check if you were given a good hex string
|
||
|
|
* @param string $hex
|
||
|
|
* @return string Color
|
||
|
|
* @throws Exception "Bad color format"
|
||
|
|
*/
|
||
|
|
private static function _checkHex( $hex ) {
|
||
|
|
// Strip # sign is present
|
||
|
|
$color = str_replace("#", "", $hex);
|
||
|
|
|
||
|
|
// Make sure it's 6 digits
|
||
|
|
if( strlen($color) == 3 ) {
|
||
|
|
$color = $color[0].$color[0].$color[1].$color[1].$color[2].$color[2];
|
||
|
|
} else if( strlen($color) != 6 ) {
|
||
|
|
throw new Exception("HEX color needs to be 6 or 3 digits long");
|
||
|
|
}
|
||
|
|
|
||
|
|
return $color;
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|