128 lines
3.1 KiB
PHP
128 lines
3.1 KiB
PHP
<?php
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namespace Index\Colour;
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class ColourHSL extends Colour {
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private float $hue;
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private float $saturation;
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private float $lightness;
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private float $alpha;
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private int $red;
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private int $green;
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private int $blue;
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public function __construct(float $hue, float $saturation, float $lightness, float $alpha) {
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$hue %= 360;
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$this->hue = $hue;
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$this->saturation = max(0.0, min(1.0, $saturation));
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$this->lightness = max(0.0, min(1.0, $lightness));
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$this->alpha = max(0.0, min(1.0, $alpha));
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$c = (1 - abs(2 * $lightness - 1)) * $saturation;
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$x = $c * (1 - abs(fmod($hue / 60, 2) - 1));
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$m = $lightness - ($c / 2);
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$r = $g = $b = 0;
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if($hue < 60) {
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$r = $c;
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$g = $x;
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} elseif($hue < 120) {
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$r = $x;
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$g = $c;
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} elseif($hue < 180) {
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$g = $c;
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$b = $x;
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} elseif($hue < 240) {
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$g = $x;
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$b = $c;
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} elseif($hue < 300) {
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$r = $x;
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$b = $c;
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} else {
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$r = $c;
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$b = $x;
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}
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$this->red = (int)round(($r + $m) * 255);
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$this->green = (int)round(($g + $m) * 255);
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$this->blue = (int)round(($b + $m) * 255);
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}
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public function getRed(): int {
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return $this->red;
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}
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public function getGreen(): int {
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return $this->green;
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}
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public function getBlue(): int {
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return $this->blue;
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}
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public function getHue(): float {
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return $this->hue;
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}
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public function getSaturation(): float {
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return $this->saturation;
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}
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public function getLightness(): float {
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return $this->lightness;
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}
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public function getAlpha(): float {
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return $this->alpha;
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}
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public function shouldInherit(): bool {
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return false;
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}
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public function __toString(): string {
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if($this->alpha < 1.0)
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return sprintf('hsla(%.2Fdeg, %d%%, %d%%, %.3F)', $this->hue, $this->saturation * 100, $this->lightness * 100, $this->alpha);
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return sprintf('hsl(%.2Fdeg, %d%%, %d%%)', $this->hue, $this->saturation * 100, $this->lightness * 100);
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}
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public static function convert(Colour $colour): ColourHSL {
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if($colour instanceof ColourHSL)
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return $colour;
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$r = $colour->getRed() / 255.0;
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$g = $colour->getGreen() / 255.0;
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$b = $colour->getBlue() / 255.0;
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$max = max($r, $g, $b);
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$min = min($r, $g, $b);
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$h = $s = 0;
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$l = ($max + $min) / 2;
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$d = $max - $min;
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if($d <> 0) {
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$s = $d / (1 - abs(2 * $l - 1));
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if($max == $r) {
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$h = 60 * fmod((($g - $b) / $d), 6);
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if($b > $g)
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$h += 360;
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} elseif($max == $g) {
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$h = 60 * (($b - $r) / $d + 2);
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} else {
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$h = 60 * (($r - $g) / $d + 4);
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}
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}
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return new ColourHSL(
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round($h, 3),
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round($s, 3),
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round($l, 3),
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$colour->getAlpha()
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);
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}
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}
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