anchor.diff:          webGL: webGL,
           frameRate: frameRate,
           color: color);
  -    
  +
       renderLoop = new StageXL.RenderLoop();
       resourceManager = new StageXL.ResourceManager();
       stateManager = new StateManager(this);
  
positive.code:     stage.focus = world;
  
    }
    
  //=============================================================================
  
    bool get autoHiDpi => StageXL.Stage.autoHiDpi;
    
    /**
     * Is the device a mobile?
     */
    bool get isMobile => StageXL.Stage.isMobile;
    
    /**
     * Give back the pixel ratio.
     */
  
negative.code:   static const int DEFAULT_COLOR = StageXL.Color.Black;
    static const bool DEFAULT_FULLSCREEN = false;
    static const num DEFAULT_MIN_SCALE = 0.8;
    static const num DEFAULT_MAX_SCALE = 1.2;
  
    //=============================================================================
  
    /**
     * Creates a new Game object.
     * Parameters:
     *
     * * width: width of the canvas
     * * height: height of the canvas
     * * webGL: use WebGL renderer?
  