Add Timer to Level on load

public/js/loaders/level.js

@@ -1,11 +1,26 @@
 import {Matrix} from '../math.js';
+import Entity from '../Entity.js';
+import LevelTimer from '../traits/LevelTimer.js';
 import Level from '../Level.js';
 import {createSpriteLayer} from '../layers/sprites.js';
 import {createBackgroundLayer} from '../layers/background.js';
 import {loadMusicSheet} from './music.js';
 import {loadSpriteSheet} from './sprite.js';
 import {loadJSON} from '../loaders.js';
 
+function createTimer() {
+    const entity = new Entity();
+    entity.addTrait(new LevelTimer());
+    return entity;
+}
+
+function setupBehavior(level) {
+    const timer = createTimer();
+    level.entities.add(timer);
+    level.events.listen(LevelTimer.EVENT_TIMER_OK, () => level.music.playTheme());
+    level.events.listen(LevelTimer.EVENT_TIMER_HURRY, () => level.music.playHurryTheme());
+}
+
 function setupBackgrounds(levelSpec, level, backgroundSprites) {
     levelSpec.layers.forEach(layer => {
         const grid = createGrid(layer.tiles, levelSpec.patterns);
@@ -41,6 +56,7 @@ export function createLevelLoader(entityFactory) {
 
             setupBackgrounds(levelSpec, level, backgroundSprites);
             setupEntities(levelSpec, level, entityFactory);
+            setupBehavior(level);
 
             return level;
         });