Tower class hierarchy

ts/layered_tile.ts

@@ -0,0 +1,23 @@
+import { Tile } from './tile.js';
+
+export class LayeredTile extends Tile {
+  elem: HTMLElement;
+
+  constructor(width: number, height: number, tiles: Tile[]) {
+    super(width, height);
+
+    this.elem.style.position = 'relative';
+
+    for (let i = 0; i < tiles.length; i++) {
+      const tile = tiles[i];
+      const sub = tile.get_elem();
+      this.elem.appendChild(sub);
+      sub.style.width = '100%';
+      sub.style.height = '100%';
+      sub.style.position = 'absolute';
+      sub.style.top = '0';
+      sub.style.left = '0';
+      sub.style.zIndex = `${i}`;
+    }
+  }
+}