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<?php |
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declare(strict_types=1); |
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namespace Artack\Color\Converter; |
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use Artack\Color\Color\Color; |
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use Artack\Color\Color\HSL; |
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use Artack\Color\Color\RGB; |
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use Webmozart\Assert\Assert; |
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class RGBToHSLConverter implements ConverterInterface |
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{ |
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public function convert(Color $color): Color |
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{ |
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/* @var RGB $color */ |
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Assert::isInstanceOf($color, RGB::class, sprintf('color should be an instance of [%s]', RGB::class)); |
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$red = $color->getRed() / 255; |
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$green = $color->getGreen() / 255; |
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$blue = $color->getBlue() / 255; |
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$cMax = max($red, $green, $blue); |
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$cMin = min($red, $green, $blue); |
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$cDelta = $cMax - $cMin; |
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$hue = $cMax; |
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if (0 == $cDelta) { |
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$hue = 0; |
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} elseif ($cMax === $red) { |
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$hue = ($green - $blue) / $cDelta; |
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} elseif ($cMax === $green) { |
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$hue = ($blue - $red) / $cDelta + 2; |
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} elseif ($cMax === $blue) { |
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$hue = ($red - $green) / $cDelta + 4; |
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} |
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$hue = (int) round($hue * 60); |
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$hue = $hue < 0 ? $hue + 360 : $hue; |
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$lightning = ($cMax + $cMin) / 2; |
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$saturation = 0 === $cDelta ? 0 : $cDelta / (1 - abs(2 * $lightning - 1)); |
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$saturation = $saturation > 1 || $saturation < 0 ? 1 : $saturation; |
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$lightning = $lightning > 1 || $lightning < 0 ? 1 : $lightning; |
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return new HSL($hue, $saturation * 100, $lightning * 100); |
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} |
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public static function supportsFrom(): string |
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{ |
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return RGB::class; |
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} |
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public static function supportsTo(): string |
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{ |
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return HSL::class; |
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} |
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} |
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ARTACK /
color
