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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | |
| 5 | namespace Phpdftk\Svg\Gradient; |
| 6 | |
| 7 | /** |
| 8 | * SVG `<radialGradient>` per SVG 2 §13.7. Defines a gradient whose colour |
| 9 | * stops vary radially from a focal point `(fx, fy)` to a circle of radius |
| 10 | * `r` centred at `(cx, cy)`. SVG 2 added the optional `fr` focal radius |
| 11 | * for proper inner-circle support. |
| 12 | * |
| 13 | * Accessors return null when the attribute is absent so the painter |
| 14 | * applies the SVG 2 §13.7.5 defaults (`cx`/`cy`/`r` = 50%, focal point |
| 15 | * coincident with centre). |
| 16 | */ |
| 17 | final class RadialGradient extends Gradient |
| 18 | { |
| 19 | public function __construct() |
| 20 | { |
| 21 | parent::__construct('radialGradient'); |
| 22 | } |
| 23 | |
| 24 | public function cx(): ?float |
| 25 | { |
| 26 | return $this->parseOptionalLength('cx'); |
| 27 | } |
| 28 | |
| 29 | public function cy(): ?float |
| 30 | { |
| 31 | return $this->parseOptionalLength('cy'); |
| 32 | } |
| 33 | |
| 34 | /** Outer-circle radius. Non-negative; null otherwise. */ |
| 35 | public function r(): ?float |
| 36 | { |
| 37 | $v = $this->parseOptionalLength('r'); |
| 38 | return $v !== null && $v < 0.0 ? null : $v; |
| 39 | } |
| 40 | |
| 41 | public function fx(): ?float |
| 42 | { |
| 43 | return $this->parseOptionalLength('fx'); |
| 44 | } |
| 45 | |
| 46 | public function fy(): ?float |
| 47 | { |
| 48 | return $this->parseOptionalLength('fy'); |
| 49 | } |
| 50 | |
| 51 | /** Focal-circle radius (SVG 2 addition). Non-negative; null otherwise. */ |
| 52 | public function fr(): ?float |
| 53 | { |
| 54 | $v = $this->parseOptionalLength('fr'); |
| 55 | return $v !== null && $v < 0.0 ? null : $v; |
| 56 | } |
| 57 | |
| 58 | private function parseOptionalLength(string $attr): ?float |
| 59 | { |
| 60 | $raw = $this->getAttribute($attr); |
| 61 | if ($raw === null) { |
| 62 | return null; |
| 63 | } |
| 64 | if (preg_match('/^\s*([+-]?(?:\d+\.?\d*|\.\d+)(?:[eE][+-]?\d+)?)/', $raw, $m) !== 1) { |
| 65 | return null; |
| 66 | } |
| 67 | return (float) $m[1]; |
| 68 | } |
| 69 | } |