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<?php namespace Arcanedev\Color\Helpers\Converters; |
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/** |
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* Class HSVTrait |
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* |
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* @package Arcanedev\Color\Helpers\Converters |
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* @author ARCANEDEV <[email protected]> |
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*/ |
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trait HSVTrait |
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{ |
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/* ------------------------------------------------------------------------------------------------ |
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| Main Functions |
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| ------------------------------------------------------------------------------------------------ |
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*/ |
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/** |
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* Convert an RGB color to an HSV array. |
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* |
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* @param int $red |
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* @param int $green |
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* @param int $blue |
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* |
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* @return array |
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*/ |
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public static function rgbToHsv($red, $green, $blue) |
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{ |
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$red = $red / 255; |
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$green = $green / 255; |
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$blue = $blue / 255; |
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$maxRGB = max($red, $green, $blue); |
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$minRGB = min($red, $green, $blue); |
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$hue = 0; |
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$saturation = 0; |
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$value = 100 * $maxRGB; |
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$chroma = $maxRGB - $minRGB; |
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if ($chroma != 0) { |
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$saturation = 100 * ($chroma / $maxRGB); |
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if ($red == $minRGB) |
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$hue = 3 - (($green - $blue) / $chroma); |
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elseif ($blue == $minRGB) |
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$hue = 1 - (($red - $green) / $chroma); |
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else // $green == $minRGB |
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$hue = 5 - (($blue - $red) / $chroma); |
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$hue = 60 * $hue; |
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} |
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return [ |
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round($hue, 2), |
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round($saturation, 2), |
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round($value, 2), |
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]; |
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} |
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/** |
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* Convert an HSV color to an RGB array. |
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* |
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* @param float|int $hue |
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* @param float|int $saturation |
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* @param float|int $value |
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* |
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* @return array |
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*/ |
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public static function hsvToRgb($hue, $saturation, $value) |
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{ |
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$lightness = self::sanitizeHsvValue($value, 0, 100) / 100.0; // Lightness: 0.0-1.0 |
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$chroma = $lightness * (self::sanitizeHsvValue($saturation, 0, 100) / 100.0); // Chroma: 0.0-1.0 |
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return array_map(function ($color) use ($lightness, $chroma) { |
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return (int) round(($color + ($lightness - $chroma)) * 255); |
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}, self::calculateRgbWithHueAndChroma($hue, $chroma)); |
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} |
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/* ------------------------------------------------------------------------------------------------ |
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| Other Functions |
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| ------------------------------------------------------------------------------------------------ |
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*/ |
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/** |
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* Calculate RGB with hue and chroma. |
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* |
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* @param float|int $hue |
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* @param float|int $chroma |
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* |
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* @return array |
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*/ |
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protected static function calculateRgbWithHueAndChroma($hue, $chroma) |
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{ |
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$hPrime = self::sanitizeHsvValue($hue, 0, 360) / 60.0; |
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$xPrime = self::calculateXPrime($hPrime, $chroma); |
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switch (floor($hPrime)) { |
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case 0: return [$chroma, $xPrime, 0.0]; |
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case 1: return [$xPrime, $chroma, 0.0]; |
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case 2: return [0.0, $chroma, $xPrime]; |
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case 3: return [0.0, $xPrime, $chroma]; |
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case 4: return [$xPrime, 0.0, $chroma]; |
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case 5: return [$chroma, 0.0, $xPrime]; |
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default: return [0.0, 0.0, 0.0]; |
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} |
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} |
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/** |
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* Calculate X-Prime. |
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* |
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* @param float|int $hPrime |
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* @param float|int $chroma |
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* |
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* @return float|int |
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*/ |
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protected static function calculateXPrime($hPrime, $chroma) |
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{ |
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while ($hPrime >= 2.0) $hPrime -= 2.0; |
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return $chroma * (1 - abs($hPrime - 1)); |
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} |
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/** |
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* Sanitize HSV value. |
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* |
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* @param int $value |
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* @param int $min |
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* @param int $max |
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* |
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* @return float|int |
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*/ |
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protected static function sanitizeHsvValue($value, $min, $max) |
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{ |
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if ($value < $min) return $min; |
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if ($value > $max) return $max; |
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return $value; |
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} |
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} |
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|
ARCANEDEV /
Color
