anchor.diff:    //}
     //void register_mouseup(MouseEvent e) {
     //  int x = e.client.x-canvas.offsetLeft; int y = e.client.y-canvas.offsetTop;
  -  //}
  -  //void register_touchstart(TouchEvent e) {
  -  //  e.preventDefault();
  -  //  if (e.touches.length > 0) {
  -  //    Touch t = e.touches.first;
  -  //    int x = t.client.x-canvas.offsetLeft; int y = t.client.y-canvas.offsetTop;
  -  //  }
  -  //}
  -  //void register_touchmove(TouchEvent e) {
  -  //  e.preventDefault();
  -  //  if (e.touches.length > 0) {
  -  //    Touch t = e.touches.first;
  -  //    int x = t.client.x-canvas.offsetLeft; int y = t.client.y-canvas.offsetTop;
  -  //  }
     //}
     //void register_touchend(TouchEvent e) {
     //  e.preventDefault();
  
positive.code:       control_map[MOUSE_MOVE][0](x, y);
      }
    }
  
    void process_entity(int entity) {}
    void remove_entity(int e) {}
  
negative.code:     // also, need to actually add the mousemove/touchmove handlers
      //canvas.onMouseDown.listen(register_mousedown);
      //window.onMouseUp.listen(register_mouseup);
  
      //window.onDeviceMotion.listen(register_devicemotion);
  
  