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Colour.php
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Colour.php
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<?php
namespace Vayes\PHPColours;
use \Exception;
class Colour {
const DEFAULT_ADJUST=10;
public function initiate($hex) {
$color=str_replace("#", "", (string) $hex);
if (strlen($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");
}
$colour=array(
'_hsl'=>self::hexToHsl($color),
'_hex'=>$color,
'_rgb'=>self::hexToRgb($color)
);
return (object) $colour;
}
public static function hexToHsl($color) {
$color =self::_checkHex($color);
$R =hexdec($color[0] . $color[1]);
$G =hexdec($color[2] . $color[3]);
$B =hexdec($color[4] . $color[5]);
$HSL =array();
$var_R =($R / 255);
$var_G =($G / 255);
$var_B =($B / 255);
$var_Min=min($var_R, $var_G, $var_B);
$var_Max=max($var_R, $var_G, $var_B);
$del_Max=$var_Max - $var_Min;
$L =($var_Max + $var_Min) / 2;
if ($del_Max == 0) {
$H=0;
$S=0;
} else {
if ($L < 0.5)
$S=$del_Max / ($var_Max + $var_Min);
else
$S=$del_Max / (2 - $var_Max - $var_Min);
$del_R=((($var_Max - $var_R) / 6) + ($del_Max / 2)) / $del_Max;
$del_G=((($var_Max - $var_G) / 6) + ($del_Max / 2)) / $del_Max;
$del_B=((($var_Max - $var_B) / 6) + ($del_Max / 2)) / $del_Max;
if ($var_R == $var_Max)
$H=$del_B - $del_G;
else if ($var_G == $var_Max)
$H=(1 / 3) + $del_R - $del_B;
else if ($var_B == $var_Max)
$H=(2 / 3) + $del_G - $del_R;
if ($H < 0)
$H++;
if ($H > 1)
$H--;
}
$HSL['H']=($H * 360);
$HSL['S']=$S;
$HSL['L']=$L;
return $HSL;
}
public static function hslToHex($hsl=array()) {
if (empty($hsl) || !isset($hsl["H"]) || !isset($hsl["S"]) || !isset($hsl["L"])) {
throw new Exception("Param was not an HSL array");
}
list($H, $S, $L)=array(
$hsl['H'] / 360,
$hsl['S'],
$hsl['L']
);
if ($S == 0) {
$r=$L * 255;
$g=$L * 255;
$b=$L * 255;
} else {
if ($L < 0.5) {
$var_2=$L * (1 + $S);
} else {
$var_2=($L + $S) - ($S * $L);
}
$var_1=2 * $L - $var_2;
$r =round(255 * self::_huetorgb($var_1, $var_2, $H + (1 / 3)));
$g =round(255 * self::_huetorgb($var_1, $var_2, $H));
$b =round(255 * self::_huetorgb($var_1, $var_2, $H - (1 / 3)));
}
$r=dechex($r);
$g=dechex($g);
$b=dechex($b);
$r=(strlen("" . $r) === 1) ? "0" . $r : $r;
$g=(strlen("" . $g) === 1) ? "0" . $g : $g;
$b=(strlen("" . $b) === 1) ? "0" . $b : $b;
return $r . $g . $b;
}
public static function hexToRgb($color) {
$color =self::_checkHex($color);
$R =hexdec($color[0] . $color[1]);
$G =hexdec($color[2] . $color[3]);
$B =hexdec($color[4] . $color[5]);
$RGB['R']=$R;
$RGB['G']=$G;
$RGB['B']=$B;
return $RGB;
}
public static function rgbToHex($rgb=array()) {
if (empty($rgb) || !isset($rgb["R"]) || !isset($rgb["G"]) || !isset($rgb["B"])) {
throw new Exception("Param was not an RGB array");
}
$hex[0]=dechex($rgb['R']);
$hex[1]=dechex($rgb['G']);
$hex[2]=dechex($rgb['B']);
return implode('', $hex);
}
public function darken($hex, $amount=self::DEFAULT_ADJUST) {
$colour=self::initiate($hex);
$darkerHSL =self::_darken($colour->_hsl, $amount);
return self::hslToHex($darkerHSL);
}
public function lighten($hex, $amount=self::DEFAULT_ADJUST) {
$colour=self::initiate($hex);
$lighterHSL=self::_lighten($colour->_hsl, $amount);
return self::hslToHex($lighterHSL);
}
public function mix($hex1, $hex2, $amount=0) {
$colour=self::initiate($hex1);
$rgb2 =self::hexToRgb($hex2);
$mixed =self::_mix($colour->_rgb, $rgb2, $amount);
return self::rgbToHex($mixed);
}
public function makeGradient($hex, $amount=self::DEFAULT_ADJUST) {
$colour=self::initiate($hex);
if (self::isLight($colour->_hex)) {
$lightColor=$colour->_hex;
$darkColor =self::darken($lightColor, $amount);
} else {
$lightColor=self::lighten($colour->_hex, $amount);
$darkColor =$colour->_hex;
}
return array(
"light"=>$lightColor,
"dark"=>$darkColor
);
}
public function isLight($hex) {
$colour=self::initiate($hex);
$color =$colour->_hex;
$r =hexdec($color[0] . $color[1]);
$g =hexdec($color[2] . $color[3]);
$b =hexdec($color[4] . $color[5]);
return (($r * 299 + $g * 587 + $b * 114) / 1000 > 130);
}
public function isDark($hex) {
$colour=self::initiate($hex);
$color =$colour->_hex;
$r =hexdec($color[0] . $color[1]);
$g =hexdec($color[2] . $color[3]);
$b =hexdec($color[4] . $color[5]);
return (($r * 299 + $g * 587 + $b * 114) / 1000 <= 130);
}
public function complementary($hex) {
$colour=self::initiate($hex);
$hsl =$colour->_hsl;
$hsl['H']+=($hsl['H'] > 180) ? -180 : 180;
return self::hslToHex($hsl);
}
public function getHsl($hex) {
$colour=self::initiate($hex);
return $colour->_hsl;
}
public function getHex($hex) {
$colour=self::initiate($hex);
return $colour->_hex;
}
public function getRgb($hex) {
$colour=self::initiate($hex);
return $colour->_rgb;
}
public function getCssGradient($hex, $amount=self::DEFAULT_ADJUST, $vintageBrowsers=FALSE, $suffix="", $prefix="") {
$colour=self::initiate($hex);
$g =self::makeGradient($colour->_hex, $amount);
$css ="";
$css.="{$prefix}background-color: #" . $colour->_hex . ";{$suffix}";
$css.="{$prefix}filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#" . $g['light'] . "', endColorstr='#" . $g['dark'] . "');{$suffix}";
if ($vintageBrowsers) {
$css.="{$prefix}background-image: -webkit-gradient(linear, 0% 0%, 0% 100%, from(#" . $g['light'] . "), to(#" . $g['dark'] . "));{$suffix}";
}
$css.="{$prefix}background-image: -webkit-linear-gradient(top, #" . $g['light'] . ", #" . $g['dark'] . ");{$suffix}";
if ($vintageBrowsers) {
$css.="{$prefix}background-image: -moz-linear-gradient(top, #" . $g['light'] . ", #" . $g['dark'] . ");{$suffix}";
}
if ($vintageBrowsers) {
$css.="{$prefix}background-image: -o-linear-gradient(top, #" . $g['light'] . ", #" . $g['dark'] . ");{$suffix}";
}
$css.="{$prefix}background-image: linear-gradient(to bottom, #" . $g['light'] . ", #" . $g['dark'] . ");{$suffix}";
return $css;
}
private function _darken($hsl, $amount=self::DEFAULT_ADJUST) {
if ($amount) {
$hsl['L']=($hsl['L'] * 100) - $amount;
$hsl['L']=($hsl['L'] < 0) ? 0 : $hsl['L'] / 100;
} else {
$hsl['L']=$hsl['L'] / 2;
}
return $hsl;
}
private function _lighten($hsl, $amount=self::DEFAULT_ADJUST) {
if ($amount) {
$hsl['L']=($hsl['L'] * 100) + $amount;
$hsl['L']=($hsl['L'] > 100) ? 1 : $hsl['L'] / 100;
} else {
$hsl['L']+=(1 - $hsl['L']) / 2;
}
return $hsl;
}
private function _mix($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
);
}
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 $v1;
}
private static function _checkHex($hex) {
$color=str_replace("#", "", $hex);
if (strlen($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;
}
}