*/ public static array $channels = [ Channels\Hue::class, Channels\Saturation::class, Channels\Value::class ]; /** * {@inheritdoc} * * @see ColorspaceInterface::colorFromNormalized() */ public function colorFromNormalized(array $normalized): ColorInterface { return new Color(...array_map( fn(string $classname, float $value_normalized) => (new $classname(normalized: $value_normalized))->value(), self::$channels, $normalized )); } /** * @param ColorInterface $color * @return ColorInterface * @throws ColorException */ public function importColor(ColorInterface $color): ColorInterface { return match ($color::class) { CmykColor::class => $this->importRgbColor($color->convertTo(RgbColorspace::class)), RgbColor::class => $this->importRgbColor($color), HslColor::class => $this->importHslColor($color), default => $color, }; } /** * @param ColorInterface $color * @return ColorInterface * @throws ColorException */ protected function importRgbColor(ColorInterface $color): ColorInterface { if (!($color instanceof RgbColor)) { throw new ColorException('Unabled to import color of type ' . $color::class . '.'); } // normalized values of rgb channels $values = array_map(fn(ColorChannelInterface $channel): float => $channel->normalize(), $color->channels()); // take only RGB $values = array_slice($values, 0, 3); // calculate chroma $min = min(...$values); $max = max(...$values); $chroma = $max - $min; // calculate value $v = 100 * $max; if ($chroma == 0) { // greyscale color return new Color(0, 0, intval(round($v))); } // calculate saturation $s = 100 * ($chroma / $max); // calculate hue [$r, $g, $b] = $values; $h = match (true) { ($r == $min) => 3 - (($g - $b) / $chroma), ($b == $min) => 1 - (($r - $g) / $chroma), default => 5 - (($b - $r) / $chroma), } * 60; return new Color( intval(round($h)), intval(round($s)), intval(round($v)) ); } /** * @param ColorInterface $color * @return ColorInterface * @throws ColorException */ protected function importHslColor(ColorInterface $color): ColorInterface { if (!($color instanceof HslColor)) { throw new ColorException('Unabled to import color of type ' . $color::class . '.'); } // normalized values of hsl channels [$h, $s, $l] = array_map( fn(ColorChannelInterface $channel): float => $channel->normalize(), $color->channels() ); $v = $l + $s * min($l, 1 - $l); $s = ($v == 0) ? 0 : 2 * (1 - $l / $v); return $this->colorFromNormalized([$h, $s, $v]); } }