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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | |
| 5 | namespace Phpdftk\Geometry; |
| 6 | |
| 7 | /** |
| 8 | * Affine transformation matrix [a b c d e f]. |
| 9 | * Transforms a point: x' = a*x + c*y + e, y' = b*x + d*y + f |
| 10 | */ |
| 11 | final class Matrix |
| 12 | { |
| 13 | public function __construct( |
| 14 | public readonly float $a = 1.0, |
| 15 | public readonly float $b = 0.0, |
| 16 | public readonly float $c = 0.0, |
| 17 | public readonly float $d = 1.0, |
| 18 | public readonly float $e = 0.0, |
| 19 | public readonly float $f = 0.0, |
| 20 | ) {} |
| 21 | |
| 22 | public static function identity(): self |
| 23 | { |
| 24 | return new self(); |
| 25 | } |
| 26 | |
| 27 | /** @return array<int, float> */ |
| 28 | public function toArray(): array |
| 29 | { |
| 30 | return [$this->a, $this->b, $this->c, $this->d, $this->e, $this->f]; |
| 31 | } |
| 32 | |
| 33 | public function multiply(self $m): self |
| 34 | { |
| 35 | return new self( |
| 36 | $this->a * $m->a + $this->b * $m->c, |
| 37 | $this->a * $m->b + $this->b * $m->d, |
| 38 | $this->c * $m->a + $this->d * $m->c, |
| 39 | $this->c * $m->b + $this->d * $m->d, |
| 40 | $this->e * $m->a + $this->f * $m->c + $m->e, |
| 41 | $this->e * $m->b + $this->f * $m->d + $m->f, |
| 42 | ); |
| 43 | } |
| 44 | |
| 45 | public function translate(float $tx, float $ty): self |
| 46 | { |
| 47 | return $this->multiply(new self(1, 0, 0, 1, $tx, $ty)); |
| 48 | } |
| 49 | |
| 50 | public function scale(float $sx, float $sy): self |
| 51 | { |
| 52 | return $this->multiply(new self($sx, 0, 0, $sy, 0, 0)); |
| 53 | } |
| 54 | |
| 55 | public function rotate(float $degrees): self |
| 56 | { |
| 57 | $r = deg2rad($degrees); |
| 58 | $cos = cos($r); |
| 59 | $sin = sin($r); |
| 60 | return $this->multiply(new self($cos, $sin, -$sin, $cos, 0, 0)); |
| 61 | } |
| 62 | |
| 63 | public function transformPoint(Point $p): Point |
| 64 | { |
| 65 | return new Point( |
| 66 | $this->a * $p->x + $this->c * $p->y + $this->e, |
| 67 | $this->b * $p->x + $this->d * $p->y + $this->f, |
| 68 | ); |
| 69 | } |
| 70 | } |