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Size the canvas grid to the active page

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Each grid cell is now the active page's size, aligned to its edges, so
the grid marks where neighbouring pages would sit. Falls back to A4 at
the origin when no page is active.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
agent 2026-09-27 17:34:28 +00:00
parent 4acb3a614c
commit 138b797506
1 changed files with 6 additions and 7 deletions
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13
src/lib/components/CanvasView.svelte
View file

@ -28,11 +28,11 @@
let stage: HTMLDivElement; let stage: HTMLDivElement;
const cssVars = pageCssVars(); const cssVars = pageCssVars();
// Background grid: world-anchored, stepping up ×4 when zoomed out so lines never get denser than ~12px. // Background grid: one cell per active page, aligned to its edges (A4 at the origin if none).
const gridStep = $derived.by(() => { const grid = $derived.by(() => {
let step = 24 * viewport.scale; const r = (doc.activeId && doc.rects.get(doc.activeId)) || { x: 0, y: 0, ...A4 };
while (step < 12) step *= 4; const s = viewport.scale;
return step; return { w: r.width * s, h: r.height * s, x: viewport.x + r.x * s, y: viewport.y + r.y * s };
}); });
// ---- autosave -------------------------------------------------------- // ---- autosave --------------------------------------------------------
@ -529,7 +529,7 @@
class:panning class:panning
class:erasing={tools.tool === 'eraser'} class:erasing={tools.tool === 'eraser'}
bind:this={stage} bind:this={stage}
style="--grid: {gridStep}px; background-position: {viewport.x}px {viewport.y}px" style="background-size: {grid.w}px {grid.h}px; background-position: {grid.x}px {grid.y}px"
onpointerdown={onPointerDown} onpointerdown={onPointerDown}
onpointermove={onPointerMove} onpointermove={onPointerMove}
onpointerup={onPointerUp} onpointerup={onPointerUp}
@ -672,7 +672,6 @@
background-image: background-image:
linear-gradient(to right, var(--grid-line) 1px, transparent 1px), linear-gradient(to right, var(--grid-line) 1px, transparent 1px),
linear-gradient(to bottom, var(--grid-line) 1px, transparent 1px); linear-gradient(to bottom, var(--grid-line) 1px, transparent 1px);
background-size: var(--grid) var(--grid);
} }
.stage :global(.cm-content) { .stage :global(.cm-content) {
user-select: text; user-select: text;