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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | |
| 5 | namespace Phpdftk\Svg; |
| 6 | |
| 7 | use Phpdftk\Svg\Value\Transform; |
| 8 | |
| 9 | /** |
| 10 | * SVG 2 §13.3 — `<pattern>` element. Defines a tile that paints |
| 11 | * into the fill or stroke of any shape that references it via |
| 12 | * `fill="url(#patternId)"`. Pattern attributes mirror `<marker>` |
| 13 | * and `<use>`: |
| 14 | * |
| 15 | * - x, y, width, height — the tile rectangle in user space |
| 16 | * (or pattern units, depending on patternUnits). |
| 17 | * - patternUnits — `objectBoundingBox` (default, %-relative |
| 18 | * to the referencing shape's bbox) or `userSpaceOnUse`. |
| 19 | * - patternContentUnits — same flag for child positioning, |
| 20 | * defaults to `userSpaceOnUse`. |
| 21 | * - viewBox + preserveAspectRatio for content scaling. |
| 22 | * - patternTransform — additional transform on the tile. |
| 23 | * |
| 24 | * For the static print renderer the typed class lifts these |
| 25 | * attributes off the generic Element surface; PDF Tiling Pattern |
| 26 | * (Pattern Type 1) emission is the next deliverable. |
| 27 | */ |
| 28 | final class Pattern extends Element |
| 29 | { |
| 30 | public function __construct() |
| 31 | { |
| 32 | parent::__construct('pattern'); |
| 33 | } |
| 34 | |
| 35 | public function x(): float |
| 36 | { |
| 37 | return $this->tileLength('x'); |
| 38 | } |
| 39 | |
| 40 | public function y(): float |
| 41 | { |
| 42 | return $this->tileLength('y'); |
| 43 | } |
| 44 | |
| 45 | public function width(): float |
| 46 | { |
| 47 | return $this->tileLength('width'); |
| 48 | } |
| 49 | |
| 50 | public function height(): float |
| 51 | { |
| 52 | return $this->tileLength('height'); |
| 53 | } |
| 54 | |
| 55 | /** |
| 56 | * One of the tile-rectangle lengths, in the units |
| 57 | * {@see patternUnits} implies. |
| 58 | * |
| 59 | * SVG 2 §13.3 — in the default `objectBoundingBox` mode a |
| 60 | * percentage is a FRACTION of the bounding box, so `100%` is one |
| 61 | * bounding box; a straight `(float)` cast read it as a hundred of |
| 62 | * them and blew the tile up until a single copy covered the whole |
| 63 | * shape. In `userSpaceOnUse` mode an absolute unit suffix converts |
| 64 | * to CSS px through the shared table. |
| 65 | * |
| 66 | * An absent or unparseable value is 0, which the painter already |
| 67 | * treats as "no tile, don't paint". |
| 68 | */ |
| 69 | private function tileLength(string $attribute): float |
| 70 | { |
| 71 | $raw = $this->getAttribute($attribute); |
| 72 | if ($raw === null) { |
| 73 | return 0.0; |
| 74 | } |
| 75 | if (preg_match( |
| 76 | '/^\s*([+-]?(?:\d+\.?\d*|\.\d+)(?:[eE][+-]?\d+)?)\s*(%|[a-zA-Z]*)/', |
| 77 | $raw, |
| 78 | $m, |
| 79 | ) !== 1) { |
| 80 | return 0.0; |
| 81 | } |
| 82 | $value = (float) $m[1]; |
| 83 | if ($m[2] === '%') { |
| 84 | return $value / 100.0; |
| 85 | } |
| 86 | return $value * Element::absoluteUnitScale($m[2]); |
| 87 | } |
| 88 | |
| 89 | public function patternUnits(): string |
| 90 | { |
| 91 | $u = strtolower($this->getAttribute('patternUnits') ?? 'objectboundingbox'); |
| 92 | return $u === 'userspaceonuse' ? 'userSpaceOnUse' : 'objectBoundingBox'; |
| 93 | } |
| 94 | |
| 95 | public function patternContentUnits(): string |
| 96 | { |
| 97 | $u = strtolower($this->getAttribute('patternContentUnits') ?? 'userspaceonuse'); |
| 98 | return $u === 'objectboundingbox' ? 'objectBoundingBox' : 'userSpaceOnUse'; |
| 99 | } |
| 100 | |
| 101 | /** |
| 102 | * @return array{0: float, 1: float, 2: float, 3: float}|null |
| 103 | */ |
| 104 | public function viewBox(): ?array |
| 105 | { |
| 106 | $vb = $this->getAttribute('viewBox'); |
| 107 | if ($vb === null) { |
| 108 | return null; |
| 109 | } |
| 110 | $parts = preg_split('/[\s,]+/', trim($vb)) ?: []; |
| 111 | if (count($parts) !== 4) { |
| 112 | return null; |
| 113 | } |
| 114 | return [ |
| 115 | (float) $parts[0], |
| 116 | (float) $parts[1], |
| 117 | (float) $parts[2], |
| 118 | (float) $parts[3], |
| 119 | ]; |
| 120 | } |
| 121 | |
| 122 | /** |
| 123 | * `href` (or legacy `xlink:href`) — when present, the |
| 124 | * referenced pattern's attributes inherit into this one. |
| 125 | * See SVG 2 §13.3 chain-resolution rules. |
| 126 | */ |
| 127 | /** |
| 128 | * SVG 2 §13.3 — `patternTransform`, an extra transform applied to |
| 129 | * the pattern tile's coordinate system on top of `patternUnits`. |
| 130 | * |
| 131 | * Read through the same attribute-or-CSS path as `transform`, so a |
| 132 | * `<style>` rule reaches it too. Null when absent, empty, `none`, |
| 133 | * or malformed. |
| 134 | */ |
| 135 | public function patternTransform(): ?Transform |
| 136 | { |
| 137 | $raw = $this->presentationOrStyle('patternTransform') |
| 138 | ?? $this->getAttribute('patternTransform'); |
| 139 | if ($raw === null || trim($raw) === '' || strtolower(trim($raw)) === 'none') { |
| 140 | return null; |
| 141 | } |
| 142 | try { |
| 143 | return Transform::parse($raw); |
| 144 | } catch (\InvalidArgumentException) { |
| 145 | return null; |
| 146 | } |
| 147 | } |
| 148 | |
| 149 | public function href(): ?string |
| 150 | { |
| 151 | return $this->getAttribute('href') |
| 152 | ?? $this->getAttribute('xlink:href'); |
| 153 | } |
| 154 | } |