Rename RenderCanvas to PaintingCanvas to avoid confusion with other classes that inherit from Rende…

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

 part of sprites;
 
 /// A Sprite is a [Node] that renders a bitmap image to the screen.
 class Sprite extends NodeWithSize {
 
   /// The texture that the sprite will render to screen.
   ///
   /// If the texture is null, the sprite will be rendered as a red square
   /// marking the bounds of the sprite.
   ///
@@ skipping 46 matching lines @@
   ///
   ///     mySprite.opacity = 0.5;
   double get opacity => _opacity;
 
   void set opacity(double opacity) {
     assert(opacity != null);
     assert(opacity >= 0.0 && opacity <= 1.0);
     _opacity = opacity;
   }
 
-  void paint(RenderCanvas canvas) {
+  void paint(PaintingCanvas canvas) {
     canvas.save();
 
     // Account for pivot point
     applyTransformForPivot(canvas);
 
     if (texture != null) {
       double w = texture.size.width;
       double h = texture.size.height;
 
       if (w <= 0 || h <= 0) return;
@@ skipping 42 matching lines @@
         canvas.drawImageRect(texture.image, texture.frame, texture.spriteSourceSize, paint);
       }
     } else {
       // Paint a red square for missing texture
       canvas.drawRect(new Rect.fromLTRB(0.0, 0.0, size.width, size.height),
       new Paint()..color = const Color.fromARGB(255, 255, 0, 0));
     }
     canvas.restore();
   }
 }