feat: Room

packages/topdown/index.js

@@ -1,5 +1,7 @@
 export {Layer} from './layer';
 export {LayerView} from './layer-view';
+export {Room} from './room';
+export {RoomView} from './room-view';
 export {TilesRenderer} from './tiles-renderer';
 export {Tiles} from './tiles';
 export {Tileset} from './tileset';

packages/topdown/room-view.js

@@ -0,0 +1,23 @@
+import {Container, Renderable} from '@avocado/graphics';
+
+import {LayerView} from './layer-view';
+
+export class RoomView extends Renderable {
+
+  constructor(room, renderer) {
+    super();
+    this.container = new Container();
+    this.room = room;
+    if (room.layers) {
+      room.layers.forEach((layer) => {
+        this.container.addChild(new LayerView(layer, renderer));
+      });
+    }
+  }
+
+  get internal() {
+    return this.container.internal;
+  }
+
+}
+

packages/topdown/room.js

@@ -0,0 +1,35 @@
+import * as I from 'immutable';
+
+import {Layer} from './layer';
+
+export class Room {
+
+  constructor() {
+    this.layers = [];
+    this._layersState = I.Map();
+    this._state = I.Map();
+  }
+
+  fromJSON(json) {
+    if (json.layers) {
+      this.layers = json.layers.map((layerJSON) => {
+        return (new Layer()).fromJSON(layerJSON);
+      });
+    }
+    return this;
+  }
+
+  get state() {
+    return this._state;
+  }
+
+  tick(elapsed) {
+    for (let i = 0; i < this.layers.length; ++i) {
+      const layer = this.layers[i];
+      layer.tick(elapsed);
+      this._layersState = this._layersState.set(i, layer.state);
+    }
+    this._state = this._state.set('layers', this._layersState);
+  }
+
+}