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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | |
| 5 | namespace Phpdftk\Color; |
| 6 | |
| 7 | /** |
| 8 | * Grayscale color (0.0 = black, 1.0 = white) — maps to PDF DeviceGray. |
| 9 | */ |
| 10 | final class GrayColor implements ColorInterface |
| 11 | { |
| 12 | public function __construct( |
| 13 | public readonly float $gray, |
| 14 | ) { |
| 15 | if ($gray < 0.0 || $gray > 1.0) { |
| 16 | throw new \InvalidArgumentException("Gray value must be 0.0–1.0, got $gray"); |
| 17 | } |
| 18 | } |
| 19 | |
| 20 | public static function black(): self |
| 21 | { |
| 22 | return new self(0.0); |
| 23 | } |
| 24 | |
| 25 | public static function white(): self |
| 26 | { |
| 27 | return new self(1.0); |
| 28 | } |
| 29 | |
| 30 | public function toRgb(): RgbColor |
| 31 | { |
| 32 | return ColorConverter::grayToRgb($this); |
| 33 | } |
| 34 | |
| 35 | /** @return array<int, float> */ |
| 36 | public function toArray(): array |
| 37 | { |
| 38 | return [$this->gray]; |
| 39 | } |
| 40 | |
| 41 | public function getColorSpace(): string |
| 42 | { |
| 43 | return 'DeviceGray'; |
| 44 | } |
| 45 | } |