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<?php |
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namespace projectcleverweb\color; |
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class generate { |
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/** |
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* Convert a hex string (no #) to a RGB array |
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* |
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* @param string $hex The hex string to convert (no #) |
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* @return array The RGB array |
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*/ |
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public static function hex_to_rgb(string $hex) :array { |
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return [ |
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'r' => hexdec(substr($hex, 0, 2)), |
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'g' => hexdec(substr($hex, 2, 2)), |
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'b' => hexdec(substr($hex, 4, 2)) |
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]; |
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} |
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public static function rgb_to_hex(int $r, int $g, int $b) :string { |
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return strtoupper( |
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str_pad(dechex($r), 2, '0', STR_PAD_LEFT) |
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.str_pad(dechex($g), 2, '0', STR_PAD_LEFT) |
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.str_pad(dechex($b), 2, '0', STR_PAD_LEFT) |
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); |
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} |
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public static function rgb_to_cmyk(float $r, float $g, float $b) :array { |
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$c = (255 - $r) / 255 * 100; |
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$m = (255 - $g) / 255 * 100; |
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$y = (255 - $b) / 255 * 100; |
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$k = min(array($c,$m,$y)); |
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$c -= $k; |
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$m -= $k; |
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$y -= $k; |
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return [ |
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'c' => round($c), |
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'm' => round($m), |
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'y' => round($y), |
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'k' => round($k) |
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]; |
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} |
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public static function cmyk_to_rgb(float $c, float $m, float $y, float $k) :array { |
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$c /= 100; |
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$m /= 100; |
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$y /= 100; |
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$k /= 100; |
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$r = 1 - min(1, $c * (1 - $k) + $k); |
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$g = 1 - min(1, $m * (1 - $k) + $k); |
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$b = 1 - min(1, $y * (1 - $k) + $k); |
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return [ |
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'r' => round($r * 255), |
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'g' => round($g * 255), |
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'b' => round($b * 255) |
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]; |
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} |
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public static function rgb_contrast(int $r = 0, int $g = 0, int $b = 0) :array { |
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return [ |
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'r' => ($r < 128) ? 255 : 0, |
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'g' => ($g < 128) ? 255 : 0, |
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'b' => ($b < 128) ? 255 : 0 |
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]; |
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} |
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public static function rgb_invert(int $r = 0, int $g = 0, int $b = 0) :array { |
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return [ |
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'r' => 255 - $r, |
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'g' => 255 - $g, |
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'b' => 255 - $b |
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]; |
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} |
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public static function yiq_score(int $r = 0, int $g = 0, int $b = 0) :float { |
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return (($r * 299) + ($g * 587) + ($b * 114)) / 1000; |
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} |
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public static function rand(int $min_r = 0, int $max_r = 255, int $min_g = 0, int $max_g = 255, int $min_b = 0, int $max_b = 255) :array { |
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return [ |
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'r' => rand(abs((int) $min_r) % 256, abs((int) $max_r) % 256), |
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'g' => rand(abs((int) $min_g) % 256, abs((int) $max_g) % 256), |
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'b' => rand(abs((int) $min_b) % 256, abs((int) $max_b) % 256) |
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]; |
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} |
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public static function rgb_to_hsl(int $r = 0, int $g = 0, int $b = 0, $accuracy = 2) :array { |
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$r /= 255; |
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$g /= 255; |
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$b /= 255; |
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$min = min($r, $g, $b); |
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$max = max($r, $g, $b); |
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$delta = $max - $min; |
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$h = 0; |
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$s = 0; |
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$l = ($max + $min) / 2; |
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if ($max != $min) { |
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$s = $delta / ($max + $min); |
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if ($l >= 0.5) { |
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$s = $delta / (2 - $max - $min); |
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} |
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static::_rgbhsl_hue($h, $r, $g, $b, $max, $delta); |
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} |
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return [ |
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'h' => round($h * 360, $accuracy), |
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's' => round($s * 100, $accuracy), |
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'l' => round($l * 100, $accuracy) |
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]; |
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} |
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protected static function _rgbhsl_delta_rgb(float $rgb, float $max, float $delta) { |
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return ((($max - $rgb) / 6) + ($delta / 2)) / $delta; |
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} |
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protected static function _rgbhsl_hue(float &$h, float $r, float $g, float $b, float $max, float $delta) { |
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$delta_r = static::_rgbhsl_delta_rgb($r, $max, $delta); |
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$delta_g = static::_rgbhsl_delta_rgb($g, $max, $delta); |
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$delta_b = static::_rgbhsl_delta_rgb($b, $max, $delta); |
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$h = (2 / 3) + $delta_g - $delta_r; |
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if ($r == $max) { |
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$h = $delta_b - $delta_g; |
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} elseif ($g == $max) { |
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$h = (1 / 3) + $delta_r - $delta_b; |
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} |
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if ($h < 0) { |
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$h++; |
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} |
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} |
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public static function hsl_to_rgb(float $h = 0, float $s = 0, float $l = 0) :array { |
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$s /= 100; |
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$l /= 100; |
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$c = (1 - abs((2 * $l) - 1)) * $s; |
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$x = $c * (1 - abs(fmod(($h / 60), 2) - 1)); |
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$m = $l - ($c / 2); |
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$r = $c; |
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$g = 0; |
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$b = $x; |
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if ($h < 180) { |
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self::_hslrgb_low($r, $g, $b, $c, $x, $h); |
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} elseif ($h < 300) { |
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self::_hslrgb_high($r, $g, $b, $c, $x, $h); |
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} |
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return [ |
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'r' => (int) round(($r + $m) * 255), |
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'g' => (int) round(($g + $m) * 255), |
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'b' => (int) round(($b + $m) * 255) |
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]; |
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} |
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private static function _hslrgb_low(float &$r, float &$g, float &$b, float $c, float $x, float $h) { |
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if ($h < 60) { |
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$r = $c; |
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$g = $x; |
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$b = 0; |
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} elseif ($h < 120) { |
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$r = $x; |
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$g = $c; |
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$b = 0; |
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} elseif ($h < 180) { |
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$r = 0; |
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$g = $c; |
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$b = $x; |
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} |
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} |
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private static function _hslrgb_high(float &$r, float &$g, float &$b, float $c, float $x, float $h) { |
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if ($h < 240) { |
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$r = 0; |
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$g = $x; |
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$b = $c; |
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} elseif ($h < 300) { |
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$r = $x; |
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$g = 0; |
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$b = $c; |
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} |
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} |
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public static function rgb_to_hsb(float $r, float $g, float $b, int $accuracy = 3) :array { |
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$r /= 255; |
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$g /= 255; |
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$b /= 255; |
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$max = max($r, $g, $b); |
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$min = min($r, $g, $b); |
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$v = $max; |
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$d = $max - $min; |
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$s = static::_div($d, $max); |
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$h = 0; // achromatic |
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if ($max != $min) { |
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static::_rgbhsl_hue($h, $r, $g, $b, $max, $d); |
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} |
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$h = round($h * 360, $accuracy); |
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$s = round($s * 100, $accuracy); |
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$v = round($v * 100, $accuracy); |
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return ['h' => $h, 's' => $s, 'b' => $v]; |
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} |
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public static function hsb_to_rgb(float $h, float $s, float $v, int $accuracy = 3) :array { |
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if ($v == 0) { |
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return ['r' => 0, 'g' => 0, 'b' => 0]; |
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} |
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$s /= 100; |
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$v /= 100; |
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$h /= 60; |
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$i = floor($h); |
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$f = $h - $i; |
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$p = $v * (1 - $s); |
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$q = $v * (1 - ($s * $f)); |
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$t = $v * (1 - ($s * (1 - $f))); |
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$calc = [ |
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[$v, $t, $p], |
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[$q, $v, $p], |
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[$p, $v, $t], |
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[$p, $q, $v], |
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[$t, $p, $v], |
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[$v, $p, $q] |
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]; |
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$r = round($calc[$i][0] * 255, $accuracy); |
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$g = round($calc[$i][1] * 255, $accuracy); |
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$b = round($calc[$i][2] * 255, $accuracy); |
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return ['r' => $r, 'g' => $g, 'b' => $b]; |
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} |
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public static function blend(float $r1, float $g1, float $b1, float $a1, float $r2, float $g2, float $b2, float $a2, float $amount = 50.0) :array { |
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$x1 = static::_div(100 - $amount, 100); |
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$x2 = static::_div($amount, 100); |
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return [ |
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'r' => round(($r1 * $x1) + ($r2 * $x2), 0), |
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'g' => round(($g1 * $x1) + ($g2 * $x2), 0), |
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'b' => round(($b1 * $x1) + ($b2 * $x2), 0), |
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'a' => ($a1 * $x1) + ($a2 * $x2) |
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]; |
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} |
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public static function _div(float $number, float $divisor) { |
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if ($divisor == 0) { |
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return 0; |
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} |
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return $number / $divisor; |
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} |
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} |
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ProjectCleverWeb /
PHP-Color
