Merge pull request #345 from vlidholt/master

Fixes analyzer warnings in sprites

packages/flutter/example/game/lib/game_demo_world.dart

@@ -561,9 +561,10 @@ class Laser extends Sprite {
 
 // Background starfield
 
-class StarField extends Node {
-  Image _image;
+class StarField extends NodeWithSize {
+  sky.Image _image;
   int _numStars;
+  bool _autoScroll;
   List<Point> _starPositions;
   List<double> _starScales;
   List<Rect> _rects;
@@ -573,7 +574,7 @@ class StarField extends Node {
     ..isAntiAlias = false
     ..setTransferMode(sky.TransferMode.plus);
 
-  StarField(SpriteSheet spriteSheet, this._numStars) {
+  StarField(SpriteSheet spriteSheet, this._numStars, [this._autoScroll = false]) : super(new Size(1024.0, 1024.0)) {
     _starPositions = [];
     _starScales = [];
     _colors = [];
@@ -618,6 +619,12 @@ class StarField extends Node {
       _starPositions[i] = new Point(xPos, yPos);
     }
   }
+
+  void update(double dt) {
+    if (_autoScroll) {
+      move(dt * 100.0, 0.0);
+    }
+  }
 }
 
 class Hud extends NodeWithSize {

packages/flutter/example/game/lib/node.dart

@@ -416,7 +416,7 @@ class Node {
   }
 
   void _prePaint(PaintingCanvas canvas) {
-    _savedTotalMatrix = canvas.getTotalMatrix();
+    _savedTotalMatrix = new Matrix4.fromFloat32List(canvas.getTotalMatrix());;
 
     // Get the transformation matrix and apply transform
     canvas.concat(transformMatrix.storage);
@@ -467,7 +467,7 @@ class Node {
   }
 
   void _postPaint(PaintingCanvas canvas) {
-    canvas.setMatrix(_savedTotalMatrix);
+    canvas.setMatrix(_savedTotalMatrix.storage);
   }
 
   // Receiving update calls

packages/flutter/example/game/lib/sprite.dart

@@ -68,7 +68,7 @@ class Sprite extends NodeWithSize {
 
   void paint(PaintingCanvas canvas) {
     // Store old matrix
-    Matrix4 savedMatrix = canvas.getTotalMatrix();
+    Matrix4 savedMatrix = new Matrix4.fromFloat32List(canvas.getTotalMatrix());
 
     // Account for pivot point
     applyTransformForPivot(canvas);
@@ -113,6 +113,6 @@ class Sprite extends NodeWithSize {
     }
 
     // Restore matrix
-    canvas.setMatrix(savedMatrix);
+    canvas.setMatrix(savedMatrix.storage);
   }
 }