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color.php
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<?php
class Color {
public $color;
# --- core functions -------------------------------------------
private function isColor() {
return is_array( $this->color ) && count( $this->color ) == 3;
}
private function rgb2hue(
$r, $g, $b,
$delta
) {
if( $delta == 0 )
return 0;
else switch( max( $r, $g, $b ) ) {
case $r:
return 60 * fmod( ( $g - $b ) / $delta, 6 ) + ( $b > $g ? 360 : 0 );
case $g:
return 60 * ( ( $b - $r ) / $delta + 2 );
case $b:
return 60 * ( ( $r - $g ) / $delta + 4 );
}
}
private function hue2rgb(
$h, $c, $m
) {
$x = $c * ( 1 - abs( fmod( $h / 60, 2 ) - 1 ) );
if( $h < 60 )
$rgb = [ $c, $x, 0 ];
else if( $h < 120 )
$rgb = [ $x, $c, 0 ];
else if( $h < 180 )
$rgb = [ 0, $c, $x ];
else if( $h < 240 )
$rgb = [ 0, $x, $c ];
else if( $h < 300 )
$rgb = [ $x, 0, $c ];
else
$rgb = [ $c, 0, $x ];
return array_map( function ( $val ) use ( $m ) {
return ( $val + $m ) * 255;
}, $rgb );
}
private function interpolateColor(
$x, $y, $i, $n
) {
return ( $x < $y )
? ( ( $y - $x ) * ( $i / $n ) ) + $x
: ( ( $x - $y ) * ( 1 - ( $i / $n ) ) ) + $y;
}
# --- set color functions --------------------------------------
public function setRGB(
int $r = 0,
int $g = 0,
int $b = 0
) {
$this->color = array_map( function ( $val ) {
return max( min( $val, 255 ), 0 );
}, [ $r, $g, $b ] );
return $this;
}
public function setRYB(
int $r = 0,
int $y = 0,
int $b = 0
) {
$w = min( $r, $y, $b );
list( $r, $y, $b ) = array_map( function ( $val ) use ( $w ) {
return $val - $w;
}, [ $r, $y, $b ] );
$my = max( $r, $y, $b );
$g = min( $y, $b );
$y -= $g;
$b -= $g;
if( $b && $g ) {
$b *= 2.0;
$g *= 2.0;
}
$r += $y;
$g += $y;
$mg = max( $r, $g, $b );
$n = $my / $mg;
list( $r, $g, $b ) = array_map( function ( $val ) use ( $w, $mg, $n ) {
return ( $mg ? $n : 1 ) * $val + $w;
}, [ $r, $g, $b ] );
$this->color = [ $r, $g, $b ];
return $this;
}
public function setHEX(
string $color
) {
$color = str_replace( '#', '', $color );
$spl = strlen( $color ) / 3;
$rep = 3 - $spl;
$this->color = array_map( function ( $val ) use ( $rep ) {
return hexdec( str_repeat( $val, $rep ) );
}, str_split( $color, $spl ) );
return $this;
}
function setHSL(
float $h = 0,
float $s = 0,
float $l = 0
) {
$c = ( 1 - abs( 2 * $l - 1 ) ) * $s;
$m = $l - ( $c / 2 );
$this->color = $this->hue2rgb( $h, $c, $m );
return $this;
}
function setHSV(
float $h = 0,
float $s = 0,
float $v = 0
) {
$c = $v * $s;
$m = $v - $c;
$this->color = $this->hue2rgb( $h, $c, $m );
return $this;
}
public function setCMYK(
float $c = 0,
float $m = 0,
float $y = 0,
float $k = 0
) {
$this->color = array_map( function ( $val ) use ( $k ) {
return 255 * ( 1 - $val ) * ( 1 - $k );
}, [ $c, $m, $y ] );
return $this;
}
public function setYUV(
float $y = 0,
float $u = 0,
float $v = 0
) {
$this->color = [
$y + ( 1 / 0.877 * $v ),
$y - ( 0.114 / 0.289391 * $u ) - ( 0.299 / 0.514799 * $v ),
$y + ( 1 / 0.493 * $u )
];
return $this;
}
# --- output functions -----------------------------------------
public function toRGB(
bool $assoc = true
) {
return $this->isColor() ? array_combine(
$assoc ? [ 'r', 'g', 'b' ] : [ 0, 1, 2 ],
array_map( 'round', $this->color )
) : null;
}
public function toRYB() {
if( !$this->isColor() )
return null;
$w = min( $this->color );
list( $r, $g, $b ) = array_map( function ( $val ) use ( $w ) {
return $val - $w;
}, $this->color );
$mg = max( $r, $g, $b );
$y = min( $r, $g );
$r -= $y;
$g -= $y;
if( $b && $g ) {
$b /= 2.0;
$g /= 2.0;
}
$y += $g;
$b += $g;
$my = max( $r, $y, $b );
$n = $mg / $my;
list( $r, $y, $b ) = array_map( function ( $val ) use ( $w, $my, $n ) {
return ( $my ? $n : 1 ) * $val + $w;
}, [ $r, $y, $b ] );
return [
'r' => $r,
'y' => $y,
'b' => $b
];
}
public function toCMYK() {
if( !$this->isColor() )
return null;
$k = 1 - max( $this->color ) / 255;
list( $c, $m, $y ) = array_map( function ( $val ) use ( $k ) {
return ( 1 - $k - $val / 255 ) / ( 1 - $k );
}, $this->color );
return [
'c' => $c,
'm' => $m,
'y' => $y,
'k' => $k
];
}
public function toHEX(
bool $hash = true
) {
return $this->isColor() ? ( $hash ? '#' : '' ) . implode( '',
array_map( function ( $val ) {
return str_pad( dechex( round( $val ) ), 2, '0', STR_PAD_LEFT );
}, $this->color )
) : null;
}
public function toHSL() {
if( !$this->isColor() )
return null;
list( $r, $g, $b ) = array_map( function ( $val ) {
return $val / 255;
}, $this->color );
$max = max( $r, $g, $b );
$min = min( $r, $g, $b );
$delta = $max - $min;
$lightness = ( $max + $min ) / 2;
return [
'h' => $this->rgb2hue( $r, $g, $b, $delta ),
's' => $delta == 0 ? 0 : $delta / ( 1 - abs( 2 * $lightness - 1 ) ),
'l' => $lightness
];
}
public function toHSV() {
if( !$this->isColor() )
return null;
list( $r, $g, $b ) = array_map( function ( $val ) {
return $val / 255;
}, $this->color );
$max = max( $r, $g, $b );
$min = min( $r, $g, $b );
$delta = $max - $min;
return [
'h' => $this->rgb2hue( $r, $g, $b, $delta ),
's' => $max == 0 ? 0 : $delta / $max,
'v' => $max
];
}
public function toXYZ() {
if( !$this->isColor() )
return null;
list( $r, $g, $b ) = array_map( function ( $val ) {
return ( ( $val /= 255 ) <= 0.04045
? $val / 12.92
: pow( ( $val + 0.055 ) / 1.055, 2.4 )
) * 100;
}, $this->color );
return [
'x' => $r * 0.412453 + $g * 0.357580 + $b * 0.180423,
'y' => $r * 0.212671 + $g * 0.715160 + $b * 0.072169,
'z' => $r * 0.019334 + $g * 0.119193 + $b * 0.950227
];
}
public function toYxy() {
if( !$this->isColor() )
return null;
list( $x, $y, $z ) = array_values( $this->toXYZ() );
$cero = max( $x, $y, $z ) == 0;
return [
'Y' => $y,
'x' => $cero ? 0 : $x / ( $x + $y + $z ),
'y' => $cero ? 0 : $y / ( $x + $y + $z )
];
}
public function toLAB() {
if( !$this->isColor() )
return null;
$xyz = $this->toXYZ();
$x = $xyz['x'] / 95.047;
$y = $xyz['y'] / 100;
$z = $xyz['z'] / 108.883;
list( $x, $y, $z ) = array_map( function ( $val ) {
return $val > 0.008856
? pow( $val, 1 / 3 )
: $val * 7.787 + 16 / 116;
}, [ $x, $y, $z ] );
return [
'l' => $y * 116 - 16,
'a' => ( $x - $y ) * 500,
'b' => ( $y - $z ) * 200
];
}
public function toLCH() {
if( !$this->isColor() )
return null;
list( $l, $a, $b ) = $this->toLAB();
return [
'l' => $l,
'c' => sqrt( pow( $a, 2 ) + pow( $b, 2 ) ),
'h' => atan( $b / $a )
];
}
public function toYUV() {
if( !$this->isColor() )
return null;
list( $r, $g, $b ) = $this->color;
$y = 0.299 * $r + 0.587 * $g + 0.114 * $b;
return [
'y' => $y,
'u' => 0.493 * ( $b - $y ),
'v' => 0.877 * ( $r - $y )
];
}
public function toYIQ() {
if( !$this->isColor() )
return null;
list( $r, $g, $b ) = $this->color;
return [
'y' => 0.299900 * $r + 0.587000 * $g + 0.114000 * $b,
'i' => 0.595716 * $r - 0.274453 * $g - 0.321264 * $b,
'q' => 0.211456 * $r - 0.522591 * $g + 0.311350 * $b
];
}
public function toYCbCr() {
if( !$this->isColor() )
return null;
list( $r, $g, $b ) = $this->color;
return [
'y' => 16 + ( 65.738 * $r / 256 ) + ( 129.057 * $g / 256 ) + ( 25.064 * $b / 256 ),
'Cb' => 128 - ( 37.945 * $r / 256 ) - ( 74.494 * $g / 256 ) + ( 112.439 * $b / 256 ),
'Cr' => 128 + ( 112.439 * $r / 256 ) - ( 94.154 * $g / 256 ) - ( 18.285 * $b / 256 )
];
}
public function toYPbPr() {
if( !$this->isColor() )
return null;
list( $r, $g, $b ) = $this->gamma();
$y = 0.299 * $r + 0.587 * $g + 0.114 * $b;
return [
'y' => $y,
'Pb' => ( $b - $y ) / 1.772,
'Pr' => ( $r - $y ) / 1.402
];
}
# --- calculations ---------------------------------------------
public function gamma() {
return $this->isColor() ? array_map( function ( $val ) {
return 255 * pow( $val / 256, 0.45 );
}, $this->color ) : null;
}
public function deltaE(
Color $compare,
bool $percentage = false
) {
if( !$this->isColor() || !$compare->isColor() )
return null;
list( $l1, $a1, $b1 ) = array_values( $this->toLAB() );
list( $l2, $a2, $b2 ) = array_values( $compare->toLAB() );
$dE = sqrt(
pow( $l1 - $l2, 2 ) +
pow( $a1 - $a2, 2 ) +
pow( $b1 - $b2, 2 )
);
return $percentage ? 1 - $dE / sqrt( 42768 ) : $dE;
}
public function diff(
Color $compare,
string $space = 'RGB'
) {
if( !$this->isColor() || !$compare->isColor() )
return null;
if( in_array( strtoupper( $space ), [ 'RGB', 'RYB' ] ) )
$fnc = 'to' . strtoupper( $space );
list( $x1, $y1, $z1 ) = array_values( $this->$fnc() );
list( $x2, $y2, $z2 ) = array_values( $compare->$fnc() );
return sqrt(
pow( $x2 - $x1, 2 ) +
pow( $y2 - $y1, 2 ) +
pow( $z2 - $z1, 2 )
);
}
public function match(
Color $compare,
string $space = 'RGB'
) {
if( !$this->isColor() || !$compare->isColor() )
return null;
return 1 - $this->diff( $compare, $space ) / sqrt( 195075 );
}
public function complementary() {
if( !$this->isColor() )
return null;
return ( new Color() )->setRGB(
255 - $this->color[0],
255 - $this->color[1],
255 - $this->color[2]
);
}
public function invert() {
return $this->complementary();
}
public function rotate(
float $degrees = 0
) {
if( !$this->isColor() )
return null;
list( $h, $s, $l ) = array_values( $this->toHSL() );
return ( new Color() )->setHSL(
( $h + 360 + ( $degrees % 360 ) ) % 360, $s, $l
);
}
public function shift(
float $degrees = 0
) {
return $this->rotate( $degrees );
}
public function lighten(
float $value = 0
) {
if( !$this->isColor() )
return null;
list( $h, $s, $l ) = array_values( $this->toHSL() );
return ( new Color() )->setHSL(
$h, $s, max( min( $l + $value, 1 ), 0 )
);
}
public function darken(
float $value = 0
) {
return $this->lighten( $value * (-1) );
}
public function saturation(
float $value = 0
) {
if( !$this->isColor() )
return null;
list( $h, $s, $l ) = array_values( $this->toHSL() );
return ( new Color() )->setHSL(
$h, max( min( $s + $value, 1 ), 0 ), $l
);
}
public function grayscale(
bool $correction = false
) {
if( !$this->isColor() )
return null;
list( $r, $g, $b ) = array_map( function ( $val ) {
return $val / 255;
}, $this->color );
return $correction ? (
( $c = 0.2126 * $r + 0.7152 * $g + 0.0722 * $b ) > 0.0031308
? 1.055 * pow( $c, 1 / 2.4 ) - 0.055
: 12.92 * $c
) : 0.299 * $r + 0.587 * $g + 0.114 * $b;
}
public function toGrayscale(
bool $correction = false
) {
return ( $g = $this->grayscale( $correction ) ) != null
? ( new Color() )->setRGB( $g * 255, $g * 255, $g * 255 )
: null;
}
public function triplet() {
return $this->triadic();
}
public function triadic() {
return $this->isColor() ? [
$this,
( new Color() )->setRGB(
$this->color[1],
$this->color[2],
$this->color[0]
),
( new Color() )->setRGB(
$this->color[2],
$this->color[0],
$this->color[1]
)
] : null;
}
public function contrast() {
return $this->isColor() ? (
(
$this->color[0] * 299 +
$this->color[1] * 587 +
$this->color[2] * 114
) / 1000 >= 128 ? 0 : 1
) : null;
}
public function gradient(
Color $stop,
int $steps = 1,
bool $boundary = true
) {
if( !$this->isColor() || !$stop->isColor() )
return null;
$n = max( min( $steps + 1, 255 ), 0 );
list( $r1, $g1, $b1 ) = $this->color;
list( $r2, $g2, $b2 ) = $stop->color;
$gradient = [];
for( $i = 0; $i <= $n; $i++ ) {
$gradient[] = ( new Color() )->setRGB(
$this->interpolateColor( $r1, $r2, $i, $n ),
$this->interpolateColor( $g1, $g2, $i, $n ),
$this->interpolateColor( $b1, $b2, $i, $n )
);
}
return $boundary ? $gradient : array_slice( $gradient, 1, -1 );
}
public function palette(
string $type = 'tints',
int $steps = 1
) {
if( !$this->isColor() || !in_array( $type, [ 'tints', 'shades' ] ) )
return null;
return $this->gradient( ( new Color() )->setHEX( [
'tints' => '#ffffff',
'shades' => '#000000'
][ $type ] ), $steps );
}
public function nearest(
int $count = 1
) {
if( !$this->isColor() || $count < 1 )
return null;
list( $r, $g, $b ) = array_values( $this->toRGB() );
list( $h, $s, $l ) = array_values( $this->toHSL() );
$results = [];
foreach( json_decode( file_get_contents( __DIR__ . '/colors.json' ), true ) as $idx => $color ) {
$diff = 2 * ( sqrt(
pow( $r - $color['rgb'][0], 2 ) +
pow( $g - $color['rgb'][1], 2 ) +
pow( $b - $color['rgb'][2], 2 )
) + sqrt(
pow( $h - $color['hsl'][0], 2 ) +
pow( $s - $color['hsl'][1], 2 ) +
pow( $l - $color['hsl'][2], 2 )
) );
$results[] = [
'name' => $color['key'],
'color' => ( new Color() )->setHEX( $color['hex'] ),
'exact' => $diff == 0,
'diff' => $diff
];
}
array_multisort( array_map( function ( $val ) {
return $val['diff' ];
}, $results ), SORT_ASC, $results );
return array_slice( $results, 0, $count );
}
public function closest(
int $count = 1
) {
return $this->nearest( $count );
}
}
?>