So erreichen Sie eine Farbraumkonvertierung in PHP

So erreichen Sie die Farbraumkonvertierung in PHP: Erstellen Sie zunächst eine PHP-Beispieldatei. Erstellen Sie dann „HSL-, HSV- und RGB-Farbraum“.

Die Betriebsumgebung dieses Artikels: Windows7-System, PHP7.1-Version, DELL G3-Computer

Wie erreicht PHP die Farbraumkonvertierung?

PHP implementiert die RGB-, HSL- und HSV-Farbraumkonvertierung

<?php
 
/**
 * HSL色彩空间描述
 * @author shizhuolin
 */
class HSL {
 
    /**
     * 色相 0-360
     * @var float 
     */
    protected $_hue;
 
    /**
     * 饱和度 0-1
     * @var float 
     */
    protected $_saturation;
 
    /**
     * 亮度 0-1
     * @var float 
     */
    protected $_lightness;
 
    /**
     * 构造HSL色彩空间描述
     * @param float $hue
     * @param float $saturation
     * @param float $lightness 
     */
    public function __construct($hue=0, $saturation=0, $lightness=0) {
        $this->_hue = $hue;
        $this->_saturation = $saturation;
        $this->_lightness = $lightness;
    }
 
    /**
     * 获取色相
     * @return float 
     */
    public function getHue() {
        return $this->_hue;
    }
 
    /**
     * 获取饱和度
     * @return float 
     */
    public function getSaturation() {
        return $this->_saturation;
    }
 
    /**
     * 获取亮度
     * @return float 
     */
    public function getLightness() {
        return $this->_lightness;
    }
 
    /**
     * 获取RGB形式色彩空间描述
     * @return RGB 
     */
    public function toRGB() {
        $h = $this->getHue();
        $s = $this->getSaturation();
        $l = $this->getLightness();
 
        if ($s == 0) {
            require_once &#39;RGB.php&#39;;
            return new RGB($l, $l, $l);
        }
 
        $q = $l < 0.5 ? $l * (1 + $s) : $l + $s - ($l * $s);
        $p = 2 * $l - $q;
        $hk = $h / 360;
        $tR = $hk + (1 / 3);
        $tG = $hk;
        $tB = $hk - (1 / 3);
 
        $tR = $this->getTC($tR);
        $tG = $this->getTC($tG);
        $tB = $this->getTC($tB);
        $tR = $this->getColorC($tR, $p, $q);
        $tG = $this->getColorC($tG, $p, $q);
        $tB = $this->getColorC($tB, $p, $q);
 
        require_once &#39;RGB.php&#39;;
        return new RGB($tR, $tG, $tB);
    }
 
    private function getColorC($tc, $p, $q) {
        if ($tc < (1 / 6)) {
            return $p + (($q - $p) * 6 * $tc );
        } else if ((1 / 6) <= $tc && $tc < 0.5) {
            return $q;
        } else if (0.5 <= $tc && $tc < (2 / 3)) {
            return $p + (($q - $p) * 6 * (2 / 3 - $tc) );
        } else {
            return $p;
        }
    }
 
    private function getTC($c) {
        if ($c < 0)
            $c++;
        if ($c > 1)
            $c--;
        return $c;
    }
 
    /**
     * 获取 array形式HSL色彩描述
     * @return array 
     */
    public function toArray() {
        return array(
            &#39;hue&#39; => $this->getHue(),
            &#39;saturation&#39; => $this->getSaturation(),
            &#39;lightness&#39; => $this->getLightness()
        );
    }
 
}

<?php
 
/**
 * HSV色彩空间描述
 * @author shizhuolin
 */
class HSV {
 
    /**
     * 色相 0-260
     * @var float 
     */
    protected $_hue;
 
    /**
     * 饱和度 0-1
     * @var float 
     */
    protected $_saturation;
 
    /**
     * 色调 0-1
     * @var float 
     */
    protected $_value;
 
    /**
     * 构造
     * @param float $hue 色相
     * @param float $saturation 饱和度
     * @param float $value 色调
     */
    public function __construct($hue=0, $saturation=0, $value=0) {
        $this->_hue = $hue;
        $this->_saturation = $saturation;
        $this->_value = $value;
    }
 
    /**
     * 获取色相 0-360
     * @return float 
     */
    public function getHue() {
        return $this->_hue;
    }
 
    /**
     * 获取饱和度 0-1
     * @return float 
     */
    public function getSaturation() {
        return $this->_saturation;
    }
 
    /**
     * 获取色调 0-1
     * @return float 
     */
    public function getValue() {
        return $this->_value;
    }
 
    /**
     * 返回该色彩在RGB色彩空间的描述
     * @return RGB
     */
    public function toRGB() {
        $hue = $this->getHue();
        $saturation = $this->getSaturation();
        $value = $this->getValue();
        $hi = floor($hue / 60) % 6;
        $f = $hue / 60 - $hi;
        $p = $value * (1 - $saturation);
        $q = $value * (1 - $f * $saturation);
        $t = $value * (1 - (1 - $f) * $saturation);
        switch ($hi) {
            case 0:
                $red = $value;
                $green = $t;
                $blue = $p;
                break;
            case 1:
                $red = $q;
                $green = $value;
                $blue = $p;
                break;
            case 2:
                $red = $p;
                $green = $value;
                $blue = $t;
                break;
            case 3:
                $red = $p;
                $green = $q;
                $blue = $value;
                break;
            case 4:
                $red = $t;
                $green = $p;
                $blue = $value;
                break;
            case 5:
                $red = $value;
                $green = $p;
                $blue = $q;
                break;
            default:
                throw new ErrorException(&#39;HSV Conversion RGB failure!&#39;);
                break;
        };
        require_once &#39;RGB.php&#39;;
        return new RGB($red, $green, $blue);
    }
 
    /**
     * 返回数组形式表达
     * @return array
     */
    public function toArray() {
        return array(
            &#39;hue&#39; => $this->getHue(),
            &#39;saturation&#39; => $this->getSaturation(),
            &#39;value&#39; => $this->getValue()
        );
    }
 
}

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