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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | |
| 5 | namespace Phpdftk\Svg\Filter; |
| 6 | |
| 7 | /** |
| 8 | * SVG 2 Filter Effects §15.15 — `<feSpecularLighting>`. Same |
| 9 | * surface-from-alpha model as feDiffuseLighting, but with the |
| 10 | * Phong specular reflection model. |
| 11 | * |
| 12 | * lighting-color / surfaceScale / kernelUnitLength |
| 13 | * — same as feDiffuseLighting. |
| 14 | * specularConstant: Phong coefficient ks, default 1 |
| 15 | * specularExponent: Phong shininess exponent, default 1 |
| 16 | */ |
| 17 | final class FeSpecularLighting extends FilterPrimitive |
| 18 | { |
| 19 | public function __construct() |
| 20 | { |
| 21 | parent::__construct('feSpecularLighting'); |
| 22 | } |
| 23 | |
| 24 | public function lightingColor(): string |
| 25 | { |
| 26 | return $this->getAttribute('lighting-color') ?? 'white'; |
| 27 | } |
| 28 | |
| 29 | public function surfaceScale(): float |
| 30 | { |
| 31 | return (float) ($this->getAttribute('surfaceScale') ?? 1); |
| 32 | } |
| 33 | |
| 34 | public function specularConstant(): float |
| 35 | { |
| 36 | return max(0.0, (float) ($this->getAttribute('specularConstant') ?? 1)); |
| 37 | } |
| 38 | |
| 39 | public function specularExponent(): float |
| 40 | { |
| 41 | return max(1.0, (float) ($this->getAttribute('specularExponent') ?? 1)); |
| 42 | } |
| 43 | |
| 44 | /** |
| 45 | * @return array{0: float, 1: float}|null |
| 46 | */ |
| 47 | public function kernelUnitLength(): ?array |
| 48 | { |
| 49 | $raw = trim($this->getAttribute('kernelUnitLength') ?? ''); |
| 50 | if ($raw === '') { |
| 51 | return null; |
| 52 | } |
| 53 | $parts = preg_split('/[\s,]+/', $raw) ?: []; |
| 54 | $dx = max(0.0, (float) ($parts[0] ?? 1)); |
| 55 | $dy = isset($parts[1]) ? max(0.0, (float) $parts[1]) : $dx; |
| 56 | return [$dx, $dy]; |
| 57 | } |
| 58 | } |