Snap to grid and flag export

src/lib/Canvas.svelte

@@ -53,8 +53,8 @@
 		if (!files || files.length === 0) return;
 
 		const rect = container.getBoundingClientRect();
-		const dropX = (e.clientX - rect.left - state.viewport.x) / state.viewport.zoom;
-		const dropY = (e.clientY - rect.top - state.viewport.y) / state.viewport.zoom;
+		const dropX = state.snap((e.clientX - rect.left - state.viewport.x) / state.viewport.zoom);
+		const dropY = state.snap((e.clientY - rect.top - state.viewport.y) / state.viewport.zoom);
 
 		for (const file of files) {
 			handleFile(file, dropX, dropY);

src/lib/Item.svelte

@@ -100,8 +100,8 @@
 			const dy = (e.clientY - dragStart.y) / appState.viewport.zoom;
 			for (const [id, startPos] of dragStartPositions) {
 				appState.updateItem(id, {
-					x: startPos.x + dx,
-					y: startPos.y + dy
+					x: appState.snap(startPos.x + dx),
+					y: appState.snap(startPos.y + dy)
 				});
 			}
 		} else if (isResizing) {
@@ -126,15 +126,17 @@
 				newHeight = constrained.height;
 			}
 
-			const deltaWidth = newWidth - resizeStart.width;
-			const deltaHeight = newHeight - resizeStart.height;
+			const snappedWidth = appState.snap(newWidth);
+			const snappedHeight = appState.snap(newHeight);
+			const deltaWidth = snappedWidth - resizeStart.width;
+			const deltaHeight = snappedHeight - resizeStart.height;
 			const offset = calculateCenterOffset(resizeStart.corner, deltaWidth, deltaHeight, item.rotation);
 
 			appState.updateItem(item.id, {
-				width: newWidth,
-				height: newHeight,
-				x: resizeStart.itemX + offset.x,
-				y: resizeStart.itemY + offset.y
+				width: snappedWidth,
+				height: snappedHeight,
+				x: appState.snap(resizeStart.itemX + offset.x),
+				y: appState.snap(resizeStart.itemY + offset.y)
 			});
 		} else if (isRotating) {
 			const el = document.querySelector(`[data-item-id="${item.id}"]`);

src/lib/Palette.svelte

@@ -8,14 +8,22 @@
 	let soundInput: HTMLInputElement;
 	let videoInput: HTMLInputElement;
 
+	function getSpawnPosition() {
+		return {
+			x: state.snap(-state.viewport.x / state.viewport.zoom + 400),
+			y: state.snap(-state.viewport.y / state.viewport.zoom + 300)
+		};
+	}
+
 	function addTile() {
 		const id = crypto.randomUUID();
+		const pos = getSpawnPosition();
 		state.addItem({
 			id,
 			html: '',
 			css: '',
-			x: -state.viewport.x / state.viewport.zoom + 400,
-			y: -state.viewport.y / state.viewport.zoom + 300,
+			x: pos.x,
+			y: pos.y,
 			width: 200,
 			height: 200,
 			rotation: 0,
@@ -26,6 +34,7 @@
 
 	function addText() {
 		const id = crypto.randomUUID();
+		const pos = getSpawnPosition();
 		state.addItem({
 			id,
 			html: '<p>Text</p>',
@@ -34,8 +43,8 @@
   font-size: 24px;
   font-family: 'Departure Mono', monospace;
 }`,
-			x: -state.viewport.x / state.viewport.zoom + 400,
-			y: -state.viewport.y / state.viewport.zoom + 300,
+			x: pos.x,
+			y: pos.y,
 			width: 200,
 			height: 50,
 			rotation: 0,
@@ -48,6 +57,7 @@
 		const url = prompt('Enter URL to embed:');
 		if (!url) return;
 		const id = crypto.randomUUID();
+		const pos = getSpawnPosition();
 		state.addItem({
 			id,
 			html: `<iframe src="${url}" frameborder="0" allowfullscreen></iframe>`,
@@ -56,8 +66,8 @@
   height: 100%;
   border: none;
 }`,
-			x: -state.viewport.x / state.viewport.zoom + 400,
-			y: -state.viewport.y / state.viewport.zoom + 300,
+			x: pos.x,
+			y: pos.y,
 			width: 640,
 			height: 480,
 			rotation: 0,
@@ -91,8 +101,7 @@
 		const id = crypto.randomUUID();
 		const assetId = crypto.randomUUID();
 		const url = URL.createObjectURL(file);
-		const x = -state.viewport.x / state.viewport.zoom + 400;
-		const y = -state.viewport.y / state.viewport.zoom + 300;
+		const pos = getSpawnPosition();
 
 		const img = document.createElement('img');
 		img.onload = () => {
@@ -106,8 +115,8 @@
   height: 100%;
   object-fit: contain;
 }`,
-				x,
-				y,
+				x: pos.x,
+				y: pos.y,
 				width: img.naturalWidth,
 				height: img.naturalHeight,
 				rotation: 0,
@@ -122,8 +131,7 @@
 		const id = crypto.randomUUID();
 		const assetId = crypto.randomUUID();
 		const url = URL.createObjectURL(file);
-		const x = -state.viewport.x / state.viewport.zoom + 400;
-		const y = -state.viewport.y / state.viewport.zoom + 300;
+		const pos = getSpawnPosition();
 
 		state.addAsset(assetId, { blob: file, url, filename: file.name });
 		state.addItem({
@@ -133,8 +141,8 @@
 			css: `audio {
   width: 100%;
 }`,
-			x,
-			y,
+			x: pos.x,
+			y: pos.y,
 			width: 300,
 			height: 54,
 			rotation: 0,
@@ -147,8 +155,7 @@
 		const id = crypto.randomUUID();
 		const assetId = crypto.randomUUID();
 		const url = URL.createObjectURL(file);
-		const x = -state.viewport.x / state.viewport.zoom + 400;
-		const y = -state.viewport.y / state.viewport.zoom + 300;
+		const pos = getSpawnPosition();
 
 		const video = document.createElement('video');
 		video.onloadedmetadata = () => {
@@ -161,8 +168,8 @@
   width: 100%;
   height: 100%;
 }`,
-				x,
-				y,
+				x: pos.x,
+				y: pos.y,
 				width: video.videoWidth || 640,
 				height: video.videoHeight || 360,
 				rotation: 0,

src/lib/Toolbar.svelte

@@ -1,5 +1,5 @@
 <script lang="ts">
-	import { Upload, Download, Paintbrush, Trash2, EyeOff, ZoomIn, Combine, Lock, Unlock } from 'lucide-svelte';
+	import { Upload, Download, Paintbrush, Trash2, EyeOff, ZoomIn, Combine, Lock, Unlock, Grid3x3 } from 'lucide-svelte';
 	import { exportBoard, importBoard, mergeBoard } from './io';
 	import { state } from './state.svelte';
 	import Palette from './Palette.svelte';
@@ -116,6 +116,13 @@
 	<button onclick={handleImportClick} title="Import" disabled={state.locked}><Upload size={14} /></button>
 	<button onclick={handleMergeClick} title="Merge" disabled={state.locked}><Combine size={14} /></button>
 	<button onclick={handleExport} title="Export"><Download size={14} /></button>
+	<button
+		class:active={state.snapToGrid}
+		onclick={() => state.setSnapToGrid(!state.snapToGrid)}
+		title={state.snapToGrid ? 'Disable snap to grid' : 'Snap to grid'}
+	>
+		<Grid3x3 size={14} />
+	</button>
 	<button
 		class:active={state.locked}
 		onclick={() => state.setLocked(!state.locked)}

src/lib/io.ts

@@ -16,6 +16,7 @@ export async function exportBoard(): Promise<{
 			items: state.manifest.items.map((item) => ({ ...item })),
 			sharedCss: state.manifest.sharedCss,
 			appCss: state.manifest.appCss,
+			flags: state.manifest.flags ?? {},
 		};
 
 		for (const item of exportManifest.items) {

src/lib/state.svelte.ts

@@ -80,6 +80,9 @@ function createState() {
 	let focusedId = $state<string | null>(null);
 	let clipboard = $state<Omit<Item, 'id'>[]>([]);
 	let locked = $state<boolean>(false);
+	let snapToGrid = $state<boolean>(false);
+
+	const GRID_SIZE = 20;
 
 	let saveTimeout: ReturnType<typeof setTimeout> | null = null;
 	let animationId: number | null = null;
@@ -220,6 +223,14 @@ function createState() {
 		}
 	}
 
+	function setSnapToGrid(value: boolean) {
+		snapToGrid = value;
+	}
+
+	function snap(value: number): number {
+		return snapToGrid ? Math.round(value / GRID_SIZE) * GRID_SIZE : value;
+	}
+
 	function focus(id: string | null) {
 		focusedId = id;
 	}
@@ -445,6 +456,9 @@ function createState() {
 		get locked() {
 			return locked;
 		},
+		get snapToGrid() {
+			return snapToGrid;
+		},
 		get maxZIndex() {
 			return maxZIndex;
 		},
@@ -461,6 +475,8 @@ function createState() {
 		edit,
 		editGlobal,
 		setLocked,
+		setSnapToGrid,
+		snap,
 		focus,
 		updateSharedCss,
 		updateAppCss,