Implement ColorFilter in widgets/basic.dart

sky/examples/game/lib/game_demo_world.dart

 part of game;
 
 // Random generator
 Math.Random _rand = new Math.Random();
 
 const double _gameSizeWidth = 1024.0;
 const double _gameSizeHeight = 1024.0;
 
 const double _shipRadius = 30.0;
 const double _lrgAsteroidRadius = 40.0;
@@ skipping 251 matching lines @@
 
 class Laser extends Sprite {
   int _frameCount = 0;
   Point _movementVector;
   double radius = 10.0;
 
   Laser.withImage(Image img, Ship ship) : super.withImage(img) {
     size = new Size(20.0, 20.0);
     position = ship.position;
     rotation = ship.rotation + 90.0;
-    transferMode = TransferMode.plusMode;
+    transferMode = TransferMode.plus;
     double rotRadians = convertDegrees2Radians(rotation);
     _movementVector = pointMult(new Point(Math.sin(rotRadians), -Math.cos(rotRadians)), 10.0);
     _movementVector = new Point(_movementVector.x + ship._movementVector[0], _movementVector.y + ship._movementVector[1]);
   }
 
   bool move() {
     position = pointAdd(position, _movementVector);
     _frameCount++;
   }
 }
@@ skipping 15 matching lines @@
     for (int i  = 0; i < _numStars; i++) {
       _starPositions.add(new Point(_rand.nextDouble() * _gameSizeWidth, _rand.nextDouble() * _gameSizeHeight));
       _starScales.add(_rand.nextDouble());
       _opacity.add(_rand.nextDouble() * 0.5 + 0.5);
     }
   }
 
   void paint(PictureRecorder canvas) {
     // Setup paint object for opacity and transfer mode
     Paint paint = new Paint();
-    paint.setTransferMode(TransferMode.plusMode);
+    paint.setTransferMode(TransferMode.plus);
 
     double baseScaleX = 32.0/_img.width;
     double baseScaleY = 32.0/_img.height;
 
     // Draw each star
     for (int i = 0; i < _numStars; i++) {
       Point pos = _starPositions[i];
       double scale = _starScales[i];
       paint.color = new Color.fromARGB((255.0*_opacity[i]).toInt(), 255, 255, 255);
 
@@ skipping 65 matching lines @@
   double dy = a.y - b.y;
   if (dx < 0.0) dx = -dx;
   if (dy < 0.0) dy = -dy;
   if (dx > dy) {
     return dx + dy/2.0;
   }
   else {
     return dy + dx/2.0;
   }
 }