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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | |
| 5 | namespace Phpdftk\Svg; |
| 6 | |
| 7 | /** |
| 8 | * SVG 2 Filter Effects §6.1 — `<filter>` element. Defines a |
| 9 | * filter graph (list of primitive `<fe*>` operations) applied |
| 10 | * to any shape that references it via `filter="url(#filterId)"` |
| 11 | * or the CSS `filter` property. |
| 12 | * |
| 13 | * <defs> |
| 14 | * <filter id="blur"> |
| 15 | * <feGaussianBlur stdDeviation="2"/> |
| 16 | * </filter> |
| 17 | * </defs> |
| 18 | * <rect filter="url(#blur)" width="100" height="100"/> |
| 19 | * |
| 20 | * The element itself never paints — like marker / pattern / |
| 21 | * gradient, it's a referenceable definition. PDF SoftMask-based |
| 22 | * filter rendering (CSS Filter Effects 1 §4) needs the raster |
| 23 | * pipeline and is a future deliverable. |
| 24 | */ |
| 25 | final class Filter extends Element |
| 26 | { |
| 27 | public function __construct() |
| 28 | { |
| 29 | parent::__construct('filter'); |
| 30 | } |
| 31 | |
| 32 | public function x(): float |
| 33 | { |
| 34 | return (float) ($this->getAttribute('x') ?? -0.1); |
| 35 | } |
| 36 | |
| 37 | public function y(): float |
| 38 | { |
| 39 | return (float) ($this->getAttribute('y') ?? -0.1); |
| 40 | } |
| 41 | |
| 42 | public function width(): float |
| 43 | { |
| 44 | return (float) ($this->getAttribute('width') ?? 1.2); |
| 45 | } |
| 46 | |
| 47 | public function height(): float |
| 48 | { |
| 49 | return (float) ($this->getAttribute('height') ?? 1.2); |
| 50 | } |
| 51 | |
| 52 | public function filterUnits(): string |
| 53 | { |
| 54 | $u = strtolower($this->getAttribute('filterUnits') ?? 'objectboundingbox'); |
| 55 | return $u === 'userspaceonuse' ? 'userSpaceOnUse' : 'objectBoundingBox'; |
| 56 | } |
| 57 | |
| 58 | public function primitiveUnits(): string |
| 59 | { |
| 60 | $u = strtolower($this->getAttribute('primitiveUnits') ?? 'userspaceonuse'); |
| 61 | return $u === 'objectboundingbox' ? 'objectBoundingBox' : 'userSpaceOnUse'; |
| 62 | } |
| 63 | |
| 64 | public function href(): ?string |
| 65 | { |
| 66 | return $this->getAttribute('href') |
| 67 | ?? $this->getAttribute('xlink:href'); |
| 68 | } |
| 69 | } |