storage

README.md

@@ -8,6 +8,8 @@ A lightweight, browser-based tool to build a tile library and paint reusable pat
 - Support rectangular tiles (multi-cell)
 - Pin a floor tile row at the bottom
 - Fill any row with a chosen tile
+- Auto-save tile library in the browser
+- Import/export the tile library as JSON
 - Export JSON for handing off to a tiler
 - Export PNG snapshots
 - Import JSON to continue a saved pattern
@@ -57,4 +59,5 @@ Open `index.html` directly in your browser, or use the optional local server scr
 - Shift-click or right click to erase a tile.
 - Enable “Floor row” to lock the bottom row to a chosen tile.
 - Use “Fill row” to quickly paint a full row with a tile.
+- Tile library changes auto-save to your browser storage.
 - If you use image tiles, keep images square for best results.

app.js

@@ -7,6 +7,9 @@ const tileImageInput = document.getElementById("tile-image");
 const tileList = document.getElementById("tile-list");
 const activeTileName = document.getElementById("active-tile-name");
 const activeTileSwatch = document.getElementById("active-tile-swatch");
+const exportLibraryButton = document.getElementById("export-library");
+const importLibraryButton = document.getElementById("import-library");
+const importLibraryFile = document.getElementById("import-library-file");
 
 const gridRowsInput = document.getElementById("grid-rows");
 const gridColsInput = document.getElementById("grid-cols");
@@ -36,6 +39,7 @@ let floorEnabled = false;
 let floorTileId = null;
 const placements = new Map();
 const imageCache = new Map();
+const STORAGE_KEY = "tile-library-v1";
 
 const config = {
   rows: Number(gridRowsInput.value),
@@ -59,6 +63,16 @@ const createPlacementId = () =>
     ? crypto.randomUUID()
     : `placement-${Date.now()}-${Math.random().toString(16).slice(2)}`;
 
+const normalizeTiles = (items) =>
+  items.map((tile) => ({
+    id: tile.id || createId(),
+    name: tile.name || "Untitled",
+    color: tile.color || "#999999",
+    width: clampNumber(Number(tile.width ?? 1), 1, 12),
+    height: clampNumber(Number(tile.height ?? 1), 1, 12),
+    imageData: tile.imageData || null,
+  }));
+
 const applyFloorRow = () => {
   if (!floorEnabled || !floorTileId) {
     return;
@@ -194,7 +208,13 @@ const renderTiles = () => {
     deleteButton.addEventListener("click", () => {
       tiles = tiles.filter((item) => item.id !== tile.id);
       imageCache.delete(tile.id);
-      grid = grid.map((row) => row.map((cell) => (cell === tile.id ? null : cell)));
+      const placementsToRemove = [];
+      placements.forEach((placement, placementId) => {
+        if (placement.tileId === tile.id) {
+          placementsToRemove.push(placementId);
+        }
+      });
+      placementsToRemove.forEach((placementId) => clearPlacement(placementId));
       if (floorTileId === tile.id) {
         floorTileId = null;
       }
@@ -204,6 +224,7 @@ const renderTiles = () => {
       renderTiles();
       renderCanvas();
       syncPatternPreview();
+      saveLibraryToStorage();
     });
 
     actions.append(selectButton, deleteButton);
@@ -268,6 +289,55 @@ const drawGridLines = () => {
   }
 };
 
+const saveLibraryToStorage = () => {
+  const payload = {
+    version: 1,
+    tiles,
+  };
+  try {
+    localStorage.setItem(STORAGE_KEY, JSON.stringify(payload));
+  } catch (error) {
+  }
+};
+
+const loadLibraryFromPayload = (payload) => {
+  if (!payload || !Array.isArray(payload.tiles)) {
+    return false;
+  }
+  tiles = normalizeTiles(payload.tiles);
+  imageCache.clear();
+  tiles.forEach((tile) => buildTileImage(tile));
+  const validIds = new Set(tiles.map((tile) => tile.id));
+  const placementsToRemove = [];
+  placements.forEach((placement, placementId) => {
+    if (!validIds.has(placement.tileId)) {
+      placementsToRemove.push(placementId);
+    }
+  });
+  placementsToRemove.forEach((placementId) => clearPlacement(placementId));
+  if (floorTileId && !validIds.has(floorTileId)) {
+    floorTileId = null;
+  }
+  setActiveTile(tiles[0]?.id ?? null);
+  renderTiles();
+  renderFloorOptions();
+  renderCanvas();
+  syncPatternPreview();
+  return true;
+};
+
+const loadLibraryFromStorage = () => {
+  try {
+    const raw = localStorage.getItem(STORAGE_KEY);
+    if (!raw) {
+      return;
+    }
+    const payload = JSON.parse(raw);
+    loadLibraryFromPayload(payload);
+  } catch (error) {
+  }
+};
+
 const renderCanvas = () => {
   resizeCanvas();
   drawGridBackground();
@@ -522,6 +592,7 @@ tileForm.addEventListener("submit", async (event) => {
   renderTiles();
   renderCanvas();
   syncPatternPreview();
+  saveLibraryToStorage();
 });
 
 const buildPattern = () => ({
@@ -674,14 +745,7 @@ importJsonButton.addEventListener("click", () => {
     floorEnabledInput.checked = floorEnabled;
     fillRowInput.value = "1";
 
-    tiles = payload.tiles.map((tile) => ({
-      id: tile.id || createId(),
-      name: tile.name || "Untitled",
-      color: tile.color || "#999999",
-      width: clampNumber(Number(tile.width ?? 1), 1, 12),
-      height: clampNumber(Number(tile.height ?? 1), 1, 12),
-      imageData: tile.imageData || null,
-    }));
+    tiles = normalizeTiles(payload.tiles);
 
     imageCache.clear();
     tiles.forEach((tile) => buildTileImage(tile));
@@ -716,12 +780,47 @@ importJsonButton.addEventListener("click", () => {
     renderFloorOptions();
     renderCanvas();
     syncPatternPreview();
+    saveLibraryToStorage();
   } catch (error) {
     alert("Could not import JSON. Please check the format.");
   }
 });
 
+exportLibraryButton.addEventListener("click", () => {
+  const payload = {
+    version: 1,
+    tiles,
+  };
+  downloadFile(JSON.stringify(payload, null, 2), "tile-library.json", "application/json");
+});
+
+importLibraryButton.addEventListener("click", () => {
+  importLibraryFile.click();
+});
+
+importLibraryFile.addEventListener("change", async (event) => {
+  const file = event.target.files?.[0];
+  if (!file) {
+    return;
+  }
+  try {
+    const text = await file.text();
+    const payload = JSON.parse(text);
+    const loaded = loadLibraryFromPayload(payload);
+    if (loaded) {
+      saveLibraryToStorage();
+    } else {
+      alert("Invalid library JSON.");
+    }
+  } catch (error) {
+    alert("Could not import library JSON.");
+  } finally {
+    importLibraryFile.value = "";
+  }
+});
+
 initGrid();
+loadLibraryFromStorage();
 renderTiles();
 renderCanvas();
 syncPatternPreview();

index.html

@@ -22,6 +22,11 @@
     <main class="app-layout">
       <section class="panel">
         <h2>Tile Library</h2>
+        <div class="library-actions">
+          <button id="export-library" class="primary">Export library</button>
+          <button id="import-library">Import library</button>
+          <input id="import-library-file" type="file" accept="application/json" hidden />
+        </div>
         <form id="tile-form" class="tile-form">
           <label>
             Tile name

styles.css

@@ -86,6 +86,13 @@ button:hover {
   margin-top: 0;
 }
 
+.library-actions {
+  display: flex;
+  gap: 10px;
+  flex-wrap: wrap;
+  margin-bottom: 12px;
+}
+
 .tile-form {
   display: grid;
   gap: 12px;