docs: function(e) {
      this.touch.cur = 'transforming';
      if (this.touch.scale) {
        var factor = 1 / (1 + e.gesture.scale - this.touch.scale);
        var coeff = this.getZoom();
        coeff *= factor;
        this.setZoom( coeff);
      }
      this.touch.scale = e.gesture.scale;
      return this;
    }