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<?php |
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/** |
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* @package Application Utils |
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* @subpackage RGBAColor |
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* @see \AppUtils\RGBAColor\ColorChannel\AlphaChannel |
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*/ |
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declare(strict_types=1); |
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namespace AppUtils\RGBAColor\ColorChannel; |
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use AppUtils\RGBAColor\ColorChannel; |
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use AppUtils\RGBAColor\UnitsConverter; |
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/** |
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* Color channel with values from 0.0 to +1.0. |
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* |
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* Native value: {@see self::getAlpha()}. |
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* |
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* @package Application Utils |
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* @subpackage RGBAColor |
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* @author Sebastian Mordziol <[email protected]> |
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*/ |
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class AlphaChannel extends ColorChannel |
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{ |
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public const VALUE_MIN = 0.0; |
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public const VALUE_MAX = 1.0; |
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/** |
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* @var float |
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*/ |
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private float $value; |
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public function __construct(float $value) |
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{ |
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if($value < self::VALUE_MIN) { $value = self::VALUE_MIN; } |
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if($value > self::VALUE_MAX) { $value = self::VALUE_MAX; } |
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$this->value = $value; |
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} |
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/** |
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* @return float 0.0-1.0 |
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*/ |
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public function getValue() : float |
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{ |
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return $this->value; |
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} |
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public function getAlpha() : float |
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{ |
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return $this->value; |
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} |
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public function get8Bit() : int |
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{ |
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return UnitsConverter::alpha2IntEightBit($this->value); |
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} |
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public function get7Bit() : int |
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{ |
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return UnitsConverter::alpha2IntSevenBit($this->value); |
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} |
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public function getPercent() : float |
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{ |
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return UnitsConverter::alpha2percent($this->value); |
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} |
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public function invert() : AlphaChannel |
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{ |
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// Float calculations are fuzzy, which is why we multiply |
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// the values to be able to work with whole numbers. Then |
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// we can divide it again to get a float. |
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return ColorChannel::alpha((1000 - ($this->value * 1000)) / 1000); |
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} |
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} |
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Mistralys /
application-utils
