docs: function FunnelPiece(data, idx) {
  
      graphic.Group.call(this);
  
      var polygon = new graphic.Polygon();
      var labelLine = new graphic.Polyline();
      var text = new graphic.Text();
      this.add(polygon);
      this.add(labelLine);
      this.add(text);
  
      this.highDownOnUpdate = function (fromState, toState) {
          if (toState === 'emphasis') {
              labelLine.ignore = labelLine.hoverIgnore;
              text.ignore = text.hoverIgnore;
          }
          else {
              labelLine.ignore = labelLine.normalIgnore;
              text.ignore = text.normalIgnore;
          }
      };
  
      this.updateData(data, idx, true);
  }