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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | |
| 5 | namespace Phpdftk\PagedMedia; |
| 6 | |
| 7 | use Phpdftk\Geometry\Rectangle; |
| 8 | |
| 9 | /** |
| 10 | * Concrete page geometry for one rendered page — size, margins, and |
| 11 | * the resolved content area where the document flow lives. |
| 12 | * |
| 13 | * CSS Paged Media 3 §3 defines the page model: the page sheet (the |
| 14 | * physical PDF page) contains the page area (everything inside |
| 15 | * page-margin minus marginalia), which contains the page content |
| 16 | * area where document flow renders. |
| 17 | * |
| 18 | * page sheet = full PDF page (size from @page { size }) |
| 19 | * page area = sheet minus page-margin |
| 20 | * content area = page area; the box document content flows into |
| 21 | * |
| 22 | * Margin boxes occupy the band between the sheet edge and the |
| 23 | * content area, positioned per {@see MarginBoxPosition}. |
| 24 | * |
| 25 | * Phase 4G.1 (extraction) constructs PageBox instances from the |
| 26 | * resolved `@page` cascade, then passes them to the painter. |
| 27 | */ |
| 28 | final readonly class PageBox |
| 29 | { |
| 30 | public function __construct( |
| 31 | public Rectangle $size, |
| 32 | public PageMargin $margin, |
| 33 | ) {} |
| 34 | |
| 35 | /** |
| 36 | * The content area — page sheet minus the four margins. This |
| 37 | * is where document flow renders; everything outside is the |
| 38 | * marginalia band. |
| 39 | */ |
| 40 | public function contentArea(): Rectangle |
| 41 | { |
| 42 | return new Rectangle( |
| 43 | $this->margin->left, |
| 44 | $this->margin->bottom, |
| 45 | $this->size->width - $this->margin->left - $this->margin->right, |
| 46 | $this->size->height - $this->margin->top - $this->margin->bottom, |
| 47 | ); |
| 48 | } |
| 49 | |
| 50 | /** |
| 51 | * Letter (US default) — 612 × 792 PDF points, 72-point margins |
| 52 | * on every edge. |
| 53 | */ |
| 54 | public static function letter(): self |
| 55 | { |
| 56 | return new self( |
| 57 | new Rectangle(0.0, 0.0, 612.0, 792.0), |
| 58 | PageMargin::uniform(72.0), |
| 59 | ); |
| 60 | } |
| 61 | |
| 62 | /** |
| 63 | * A4 — 595 × 842 PDF points, 72-point margins on every edge. |
| 64 | */ |
| 65 | public static function a4(): self |
| 66 | { |
| 67 | return new self( |
| 68 | new Rectangle(0.0, 0.0, 595.0, 842.0), |
| 69 | PageMargin::uniform(72.0), |
| 70 | ); |
| 71 | } |
| 72 | } |