Random cleanup of various Dart things in our tree.

sky/sdk/example/game/lib/texture.dart

 part of sprites;
 
 /// A texture represents a rectangular area of an image and is typically used to draw a sprite to the screen.
 ///
 /// Normally you get a reference to a texture from a [SpriteSheet], but you can also create one from an [Image].
 class Texture {
   /// The image that this texture is a part of.
   ///
   ///     var textureImage = myTexture.image;
   final Image image;
@@ skipping 69 matching lines @@
     double y = position.y;
     bool translate = (x != 0 || y != 0);
     if (translate) {
       canvas.translate(x, y);
     }
 
     // Draw the texture
     if (rotated) {
       // Calculate the rotated frame and spriteSourceSize
       Size originalFrameSize = frame.size;
-      Rect rotatedFrame = new Rect.fromPointAndSize(frame.upperLeft, new Size(originalFrameSize.height, originalFrameSize.width));
+      Rect rotatedFrame = frame.topLeft & new Size(originalFrameSize.height, originalFrameSize.width);
       Point rotatedSpriteSourcePoint = new Point(
           -spriteSourceSize.top - (spriteSourceSize.bottom - spriteSourceSize.top),
           spriteSourceSize.left);
-      Rect rotatedSpriteSourceSize = new Rect.fromPointAndSize(rotatedSpriteSourcePoint, new Size(originalFrameSize.height, originalFrameSize.width));
+      Rect rotatedSpriteSourceSize = rotatedSpriteSourcePoint & new Size(originalFrameSize.height, originalFrameSize.width);
 
       // Draw the rotated sprite
       canvas.rotate(-Math.PI/2.0);
       canvas.drawImageRect(image, rotatedFrame, rotatedSpriteSourceSize, paint);
       canvas.rotate(Math.PI/2.0);
     } else {
       // Draw the sprite
       canvas.drawImageRect(image, frame, spriteSourceSize, paint);
     }
 
     // Translate back
     if (translate) {
       canvas.translate(-x, -y);
     }
   }
 }