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6.01
1<?php
2
3declare(strict_types=1);
4
5namespace Phpdftk\Svg\Gradient;
6
7/**
8 * SVG `<linearGradient>` per SVG 2 §13.6. Endpoints `(x1, y1)` and
9 * `(x2, y2)` define the gradient axis; stops are colour samples along it.
10 *
11 * Each endpoint accessor returns null when the attribute is absent so the
12 * painter can apply the unit-mode-specific defaults (e.g., `x1=0` /
13 * `x2=1` in `objectBoundingBox` mode, `0` / `100%` in `userSpaceOnUse`
14 * mode per SVG 2 §13.6.5).
15 */
16final class LinearGradient extends Gradient
17{
18    public function __construct()
19    {
20        parent::__construct('linearGradient');
21    }
22
23    public function x1(): ?float
24    {
25        return $this->parseOptionalLength('x1');
26    }
27
28    public function y1(): ?float
29    {
30        return $this->parseOptionalLength('y1');
31    }
32
33    public function x2(): ?float
34    {
35        return $this->parseOptionalLength('x2');
36    }
37
38    public function y2(): ?float
39    {
40        return $this->parseOptionalLength('y2');
41    }
42
43    private function parseOptionalLength(string $attr): ?float
44    {
45        $raw = $this->getAttribute($attr);
46        if ($raw === null) {
47            return null;
48        }
49        if (preg_match(
50            '/^\s*([+-]?(?:\d+\.?\d*|\.\d+)(?:[eE][+-]?\d+)?)\s*(%|[a-zA-Z]*)/',
51            $raw,
52            $m,
53        ) !== 1) {
54            return null;
55        }
56        $value = (float) $m[1];
57        if ($m[2] !== '' && $m[2] !== '%') {
58            // A gradient coordinate is a `<length>`, so an ABSOLUTE
59            // unit suffix is meaningful: `x2="1in"` is 96 CSS px, which
60            // in objectBoundingBox mode is 96 bounding-box widths, not
61            // one. Throwing the suffix away read `1in` as `1`.
62            // Font-relative units need context this accessor doesn't
63            // have, so `absoluteUnitScale()` leaves them at 1.
64            return $value * \Phpdftk\Svg\Element::absoluteUnitScale($m[2]);
65        }
66        // SVG 2 §13.6.5 — a percentage in objectBoundingBox mode (the default
67        // gradientUnits) is a fraction of the bounding box, so `100%` == `1`.
68        // Normalise to the [0, 1] fraction the GradientPainter bbox mapping
69        // expects; parsing `x2="100%"` as `100` stretched the axis 100x so the
70        // shape sampled a single stop (a solid colour).
71        if ($m[2] === '%') {
72            $value /= 100.0;
73        }
74        return $value;
75    }
76}