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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | |
| 5 | namespace Phpdftk\Css\Value; |
| 6 | |
| 7 | /** |
| 8 | * `linear(<linear-stop-list>)` per CSS Easing 2 §3.1. Defines a |
| 9 | * piecewise-linear easing function as a sequence of `(output, |
| 10 | * input?)` pairs. Used in `animation-timing-function`, |
| 11 | * `transition-timing-function`, and `offset-rotate` interpolations. |
| 12 | * |
| 13 | * linear(0, 0.5 50%, 1) three-stop linear |
| 14 | * linear(0 0%, 1 100%) explicit anchors |
| 15 | * linear(0, 0.25 25% 50%, 1) range form (CSS Easing 2 §3.2) |
| 16 | * |
| 17 | * For the range form (`<output> <input-from>% <input-to>%`), we |
| 18 | * store each instance as two LinearEasingStop entries sharing the |
| 19 | * same output — equivalent to a horizontal segment of the |
| 20 | * piecewise function. |
| 21 | */ |
| 22 | final readonly class LinearEasing extends Value |
| 23 | { |
| 24 | /** |
| 25 | * @param list<LinearEasingStop> $stops |
| 26 | */ |
| 27 | public function __construct(public array $stops) {} |
| 28 | |
| 29 | public function toCss(): string |
| 30 | { |
| 31 | $parts = []; |
| 32 | foreach ($this->stops as $stop) { |
| 33 | $parts[] = $stop->toCss(); |
| 34 | } |
| 35 | return 'linear(' . implode(', ', $parts) . ')'; |
| 36 | } |
| 37 | } |