Improves on demo game balance and adds levels for lasers

examples/game/lib/game_demo_node.dart

@@ -4,7 +4,7 @@ final double _gameSizeWidth = 320.0;
 double _gameSizeHeight = 320.0;
 
 final double _chunkSpacing = 640.0;
-final int _chunksPerLevel = 6;
+final int _chunksPerLevel = 8;
 
 final bool _drawDebug = false;
 
@@ -198,33 +198,39 @@ class GameDemoNode extends NodeWithSize {
       lbl.position = new Point(0.0, yPos + _chunkSpacing / 2.0 - 150.0);
       _level.addChild(lbl);
     } else if (part == 1) {
-      _objectFactory.addAsteroids(10 + level * 4, yPos, 0.0 + (level * 0.2).clamp(0.0, 0.7));
+      _objectFactory.addAsteroids(10 + level * 2, yPos, 0.0 + (level * 0.2).clamp(0.0, 0.7));
     } else if (part == 2) {
       _objectFactory.addEnemyScoutSwarm(4 + level * 2, yPos);
     } else if (part == 3) {
-      _objectFactory.addAsteroids(10 + level * 4, yPos, 0.0 + (level * 0.2).clamp(0.0, 0.7));
+      _objectFactory.addAsteroids(10 + level * 2, yPos, 0.0 + (level * 0.2).clamp(0.0, 0.7));
     } else if (part == 4) {
       _objectFactory.addEnemyDestroyerSwarm(2 + level, yPos);
     } else if (part == 5) {
-      _objectFactory.addAsteroids(10 + level * 4, yPos, 0.0 + (level * 0.2).clamp(0.0, 0.7));
+      _objectFactory.addAsteroids(10 + level * 2, yPos, 0.0 + (level * 0.2).clamp(0.0, 0.7));
+    } else if (part == 6) {
+      _objectFactory.addEnemyScoutSwarm(4 + level * 2, yPos);
+    } else if (part == 7) {
+      _objectFactory.addAsteroids(10 + level * 2, yPos, 0.0 + (level * 0.2).clamp(0.0, 0.7));
     }
   }
 
   void fire() {
-    Laser shot0 = new Laser(_objectFactory, -90.0);
+    int laserLevel = _objectFactory.playerState.laserLevel;
+
+    Laser shot0 = new Laser(_objectFactory, laserLevel, -90.0);
     shot0.position = _level.ship.position + new Offset(17.0, -10.0);
     _level.addChild(shot0);
 
-    Laser shot1 = new Laser(_objectFactory, -90.0);
+    Laser shot1 = new Laser(_objectFactory, laserLevel, -90.0);
     shot1.position = _level.ship.position + new Offset(-17.0, -10.0);
     _level.addChild(shot1);
 
     if (_playerState.sideLaserActive) {
-      Laser shot2 = new Laser(_objectFactory, 0.0);
+      Laser shot2 = new Laser(_objectFactory, laserLevel, 0.0);
       shot2.position = _level.ship.position + new Offset(17.0, -10.0);
       _level.addChild(shot2);
 
-      Laser shot3 = new Laser(_objectFactory, 180.0);
+      Laser shot3 = new Laser(_objectFactory, laserLevel, 180.0);
       shot3.position = _level.ship.position + new Offset(-17.0, -10.0);
       _level.addChild(shot3);
     }

examples/game/lib/game_objects.dart

@@ -92,7 +92,7 @@ class LevelLabel extends GameObject {
     canBeDamaged = false;
 
     Label lbl = new Label(
-      "LEVEL $level",
+      "L E V E L $level",
       new TextStyle(
         textAlign: TextAlign.center,
         color:new Color(0xffffffff),
@@ -156,27 +156,54 @@ class Ship extends GameObject {
 }
 
 class Laser extends GameObject {
-  double impact = 1.0;
-
-  Laser(GameObjectFactory f, double r) : super(f) {
-    // Add sprite
-    _sprt = new Sprite(f.sheet["explosion_particle.png"]);
-    _sprt.scale = 0.5;
-    _sprt.colorOverlay = new Color(0xff95f4fb);
-    _sprt.transferMode = sky.TransferMode.plus;
-    _sprt.rotation = r + 90.0;
-    addChild(_sprt);
+  double impact = 0.0;
+
+  final List<Color> laserColors = [
+    new Color(0xff95f4fb),
+    new Color(0xff5bff35),
+    new Color(0xffff886c),
+    new Color(0xffffd012),
+    new Color(0xfffd7fff)
+  ];
+
+  Laser(GameObjectFactory f, int level, double r) : super(f) {
+    // Game object properties
     radius = 10.0;
     removeLimit = 640.0;
-
-
     canDamageShip = false;
     canBeDamaged = false;
+    impact = 1.0 + level * 0.5;
 
+    // Offset for movement
     _offset = new Offset(math.cos(radians(r)) * 10.0, math.sin(radians(r)) * 10.0);
+
+    // Drawing properties
+    rotation = r + 90.0;
+    int numLasers = level % 3 + 1;
+    Color laserColor = laserColors[(level ~/ 3) % laserColors.length];
+
+    // Add sprites
+    List<Sprite> sprites = [];
+    for (int i = 0; i < numLasers; i++) {
+      Sprite sprt = new Sprite(f.sheet["explosion_particle.png"]);
+      sprt.scale = 0.5;
+      sprt.colorOverlay = laserColor;
+      sprt.transferMode = sky.TransferMode.plus;
+      addChild(sprt);
+      sprites.add(sprt);
+    }
+
+    // Position the individual sprites
+    if (numLasers == 2) {
+      sprites[0].position = new Point(-3.0, 0.0);
+      sprites[1].position = new Point(3.0, 0.0);
+    } else if (numLasers == 3) {
+      sprites[0].position = new Point(-4.0, 0.0);
+      sprites[1].position = new Point(4.0, 0.0);
+      sprites[2].position = new Point(0.0, -2.0);
+    }
   }
 
-  Sprite _sprt;
   Offset _offset;
 
   void move() {

examples/game/lib/player_state.dart

@@ -28,6 +28,8 @@ class PlayerState extends Node {
   final SpriteSheet _sheetUI;
   final SpriteSheet _sheetGame;
 
+  int laserLevel = 0;
+
   Sprite _sprtBgScore;
   ScoreDisplay _scoreDisplay;
   Sprite _sprtBgCoins;