Playable demo game and bug fixes in sprites

sky/examples/game/lib/game_tests.dart

Index: sky/examples/game/lib/game_tests.dart
diff --git a/sky/examples/game/lib/game_tests.dart b/sky/examples/game/lib/game_tests.dart
deleted file mode 100644
index b74910eff00490db388c052d2f94a1243361cf26..0000000000000000000000000000000000000000
--- a/sky/examples/game/lib/game_tests.dart
+++ /dev/null
@@ -1,131 +0,0 @@
-part of game;
-
-Math.Random _rand;
-
-class GameTestsBox extends SpriteBox {
-  GameTestsBox(Node tests, SpriteBoxTransformMode mode) : super(tests, mode);
-
-  void handleEvent(Event event, BoxHitTestEntry entry) {
-
-    if (event is PointerEvent) {
-      Point pointerPos = new Point(event.x, event.y);
-      int pointer = event.pointer;
-
-      switch (event.type) {
-        case 'pointerdown':
-          List sprites = findNodesAtPosition(pointerPos);
-          for (Node node in sprites) {
-            if (node is Sprite) {
-              Sprite sprt = node;
-              sprt.colorOverlay = new Color(0x66ff0000);
-            }
-          }
-          break;
-      }
-    }
-  }
-}
-
-class GameTestsSimple extends Node {
-  Image _imgAsteroid;
-  Image _imgBg;
-  Image _imgShip;
-
-  GameTestsSimple(ImageMap images) {
-    // Setup random number generator
-    _rand = new Math.Random();
-
-    // Fetch images
-    _imgBg = images["https://raw.githubusercontent.com/slembcke/GalacticGuardian.spritebuilder/GDC/Packages/SpriteBuilder%20Resources.sbpack/resources-auto/BurnTexture.png"];
-    _imgAsteroid = images["https://raw.githubusercontent.com/slembcke/GalacticGuardian.spritebuilder/GDC/Packages/SpriteBuilder%20Resources.sbpack/Sprites/resources-auto/asteroid_big_002.png"];
-    _imgShip = images["https://raw.githubusercontent.com/slembcke/GalacticGuardian.spritebuilder/GDC/Packages/SpriteBuilder%20Resources.sbpack/Sprites/resources-auto/GG_blueship_Lv3.png"];
-
-    Sprite sprt0 = new Sprite.withImage(_imgBg);
-    sprt0.size = new Size(100.0, 100.0);
-    sprt0.pivot = new Point(0.0, 0.0);
-    sprt0.position = new Point(100.0, 100.0);
-    this.addChild(sprt0);
-
-    Sprite sprt1 = new Sprite.withImage(_imgBg);
-    sprt1.size = new Size(100.0, 100.0);
-    sprt1.pivot = new Point(0.0, 0.0);
-    sprt1.position = new Point(100.0, 100.0);
-    sprt0.addChild(sprt1);
-  }
-}
-
-class GameTests extends Node{
-
-  Image _imgAsteroid;
-  Image _imgBg;
-  Image _imgShip;
-
-  GameTests(ImageMap images) {
-    // Setup random number generator
-    _rand = new Math.Random();
-
-    // Fetch images
-    _imgBg = images["https://raw.githubusercontent.com/slembcke/GalacticGuardian.spritebuilder/GDC/Packages/SpriteBuilder%20Resources.sbpack/resources-auto/BurnTexture.png"];
-    _imgAsteroid = images["https://raw.githubusercontent.com/slembcke/GalacticGuardian.spritebuilder/GDC/Packages/SpriteBuilder%20Resources.sbpack/Sprites/resources-auto/asteroid_big_002.png"];
-    _imgShip = images["https://raw.githubusercontent.com/slembcke/GalacticGuardian.spritebuilder/GDC/Packages/SpriteBuilder%20Resources.sbpack/Sprites/resources-auto/GG_blueship_Lv3.png"];
-
-    for (int i = 0; i < 100; i++) {
-      addSprite(i/100.0);
-    }
-  }
-
-  void addSprite([double scale = null]) {
-    TestAsteroidSprite sprt = new TestAsteroidSprite.withImage(_imgAsteroid);
-    sprt.size = new Size(64.0, 64.0);
-
-    if (scale == null) {
-      scale = _rand.nextDouble();
-    }
-
-    sprt.zPosition = scale;
-    sprt.scale = scale;
-    sprt.position = new Point(_rand.nextDouble()*1024.0, _rand.nextDouble()*1024.0);
-
-    this.addChild(sprt);
-
-    Sprite sprtMoon0 = new Sprite.withImage(_imgAsteroid);
-    sprtMoon0.size = new Size(32.0, 32.0);
-    sprtMoon0.position = new Point(32.0, 0.0);
-    sprt.addChild(sprtMoon0);
-
-    Sprite sprtMoon1 = new Sprite.withImage(_imgAsteroid);
-    sprtMoon1.size = new Size(32.0, 32.0);
-    sprtMoon1.position = new Point(-32.0, 0.0);
-    sprt.addChild(sprtMoon1);
-  }
-
-  void update(double dt) {
-    for (Node child in children) {
-      child.update(dt);
-    }
-  }
-}
-
-class TestAsteroidSprite extends Sprite {
-
-  Vector2 _movementVector;
-  double _rotationalSpeed;
-
-  TestAsteroidSprite.withImage(Image img) : super.withImage(img) {
-    _movementVector = new Vector2(_rand.nextDouble() * 4.0 - 2.0, _rand.nextDouble() * 4.0 - 2.0);
-    _rotationalSpeed = _rand.nextDouble() * 2.0 - 1.0;
-  }
-
-  void update(double dt) {
-    Vector2 vPos = new Vector2(position.x, position.y);
-    Vector2 vNewPos = vPos + _movementVector * scale;
-
-    position = new Point(vNewPos[0], vNewPos[1]);
-
-    // Bounce at edges
-    if (position.x < 0 || position.x > 1024.0) _movementVector[0] = -_movementVector[0];
-    if (position.y < 0 || position.y > 1024.0) _movementVector[1] = -_movementVector[1];
-
-    rotation += _rotationalSpeed;
-  }
-}