Adds sounds to demo game

examples/game/lib/game_demo_world.dart

@@ -28,6 +28,10 @@ class GameDemoWorld extends NodeWithSize {
 
   SpriteSheet _spriteSheet;
   SpriteSheet _spriteSheetUI;
+
+  Map<String,SoundEffect> _sounds;
+  SoundPool _soundPool = SoundPool.sharedInstance();
+
   Navigator _navigator;
 
   // Inputs
@@ -54,7 +58,7 @@ class GameDemoWorld extends NodeWithSize {
 
   Function _gameOverCallback;
 
-  GameDemoWorld(App app, this._navigator, ImageMap images, this._spriteSheet, this._spriteSheetUI, this._gameOverCallback) : super(new Size(_gameSizeWidth, _gameSizeHeight)) {
+  GameDemoWorld(App app, this._navigator, ImageMap images, this._spriteSheet, this._spriteSheetUI, this._sounds, this._gameOverCallback) : super(new Size(_gameSizeWidth, _gameSizeHeight)) {
     // Fetch images
     _imgNebula = images["assets/nebula.png"];
 
@@ -140,6 +144,8 @@ class GameDemoWorld extends NodeWithSize {
     laser.constrainProportions = true;
     _lasers.add(laser);
     _gameLayer.addChild(laser);
+
+    _soundPool.play(_sounds["laser"]);
   }
 
   void addNebula() {
@@ -225,6 +231,8 @@ class GameDemoWorld extends NodeWithSize {
     }
 
     _gameLayer.addChild(explosionNode);
+
+    _soundPool.play(_sounds["explosion"]);
   }
 
   void update(double dt) {

examples/game/lib/main.dart

@@ -28,6 +28,7 @@ ImageMap _loader;
 SpriteSheet _spriteSheet;
 SpriteSheet _spriteSheetUI;
 GameDemoApp _app;
+Map<String,SoundEffect> _sounds = {};
 
 main() async {
   _loader = new ImageMap(_bundle);
@@ -47,6 +48,12 @@ main() async {
 
   _app = new GameDemoApp();
 
+  _sounds["explosion"] = new SoundEffect('https://github.com/slembcke/GalacticGuardian.spritebuilder/raw/GDC/Packages/SpriteBuilder%20Resources.sbpack/TempSounds/Explosion.wav');
+  _sounds["laser"] = new SoundEffect('https://github.com/slembcke/GalacticGuardian.spritebuilder/raw/GDC/Packages/SpriteBuilder%20Resources.sbpack/TempSounds/Laser.wav');
+
+  await _sounds["explosion"].load();
+  await _sounds["laser"].load();
+
   runApp(_app);
 }
 
@@ -103,6 +110,7 @@ class GameDemoApp extends App {
               _loader,
               _spriteSheet,
               _spriteSheetUI,
+              _sounds,
               (lastScore) {
                 setState(() {_lastScore = lastScore;});
               }