Fixes matrix transformations 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
index c9800df8d001b20d524d59049744e95d303ea1ca..b74910eff00490db388c052d2f94a1243361cf26 100644
--- a/sky/examples/game/lib/game_tests.dart
+++ b/sky/examples/game/lib/game_tests.dart
@@ -2,7 +2,59 @@ part of game;
 
 Math.Random _rand;
 
-class GameTests extends TransformNode{
+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);

[abarth-chromium, 2015/06/11 00:20:19]

You might want to use entry.localPosition rather than event.x and event.y.  That
will give you a Point in your local coordinate space.

+      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);

[abarth-chromium, 2015/06/11 00:20:19]

I think you can just write:

node.colorOverlay = new Color(0x66ff0000);

The analyzer should be smart enough to figure it out.

+            }
+          }
+          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;
@@ -24,8 +76,7 @@ class GameTests extends TransformNode{
 
   void addSprite([double scale = null]) {
     TestAsteroidSprite sprt = new TestAsteroidSprite.withImage(_imgAsteroid);
-    sprt.width = 64.0;
-    sprt.height = 64.0;
+    sprt.size = new Size(64.0, 64.0);
 
     if (scale == null) {
       scale = _rand.nextDouble();
@@ -33,19 +84,29 @@ class GameTests extends TransformNode{
 
     sprt.zPosition = scale;
     sprt.scale = scale;
-    sprt.position = new Vector2(_rand.nextDouble()*1024.0, _rand.nextDouble()*1024.0);
+    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 (TransformNode child in children) {
+    for (Node child in children) {
       child.update(dt);
     }
   }
 }
 
-class TestAsteroidSprite extends SpriteNode {
+class TestAsteroidSprite extends Sprite {
 
   Vector2 _movementVector;
   double _rotationalSpeed;
@@ -56,11 +117,14 @@ class TestAsteroidSprite extends SpriteNode {
   }
 
   void update(double dt) {
-    position = position + _movementVector * scale;
+    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[0] < 0 || position[0] > 1024.0) _movementVector[0] = -_movementVector[0];
-    if (position[1] < 0 || position[1] > 1024.0) _movementVector[1] = -_movementVector[1];
+    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;
   }