code: function(e) {
      this.touch.cur = 'dragging';
      var delta = 0;
      if (this.touch.lastY && (e.gesture.direction == 'up' || e.gesture.direction == 'down')) {
        //tilt
        delta = e.gesture.deltaY - this.touch.lastY;
        this.angleX += delta;
      } else if (this.touch.lastX && (e.gesture.direction == 'left' || e.gesture.direction == 'right')) {
        //pan
        delta = e.gesture.deltaX - this.touch.lastX;
        this.angleZ += delta;
      }
      if (delta)
        this.onDraw();
      this.touch.lastX = e.gesture.deltaX;
      this.touch.lastY = e.gesture.deltaY;
    }
docs: pan & tilt with one finger