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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | |
| 5 | namespace Phpdftk\Svg\Value\Transform; |
| 6 | |
| 7 | use Phpdftk\Svg\Value\TransformFunction; |
| 8 | |
| 9 | /** |
| 10 | * `rotate(angle)` or `rotate(angle, cx, cy)`. The angle is in degrees per |
| 11 | * SVG. The 3-arg form rotates around `(cx, cy)` — equivalent to |
| 12 | * `translate(cx, cy) rotate(angle) translate(-cx, -cy)`. |
| 13 | */ |
| 14 | final class Rotate implements TransformFunction |
| 15 | { |
| 16 | public function __construct( |
| 17 | public readonly float $angle, |
| 18 | public readonly ?float $cx = null, |
| 19 | public readonly ?float $cy = null, |
| 20 | ) {} |
| 21 | |
| 22 | public function toMatrix(): array |
| 23 | { |
| 24 | $rad = deg2rad($this->angle); |
| 25 | $cos = cos($rad); |
| 26 | $sin = sin($rad); |
| 27 | if ($this->cx === null && $this->cy === null) { |
| 28 | return [$cos, $sin, -$sin, $cos, 0.0, 0.0]; |
| 29 | } |
| 30 | $cx = $this->cx ?? 0.0; |
| 31 | $cy = $this->cy ?? 0.0; |
| 32 | // M = T(cx,cy) · R(θ) · T(-cx,-cy); pre-folded so the painter |
| 33 | // doesn't have to compose three steps every paint call. |
| 34 | $e = $cx - $cos * $cx + $sin * $cy; |
| 35 | $f = $cy - $sin * $cx - $cos * $cy; |
| 36 | return [$cos, $sin, -$sin, $cos, $e, $f]; |
| 37 | } |
| 38 | } |