en/builder/src/echarts3/component/legend/legendFilter.js

export default function (ecModel) {
  var legendModels = ecModel.findComponents({
    mainType: 'legend'
  });

  if (legendModels && legendModels.length) {
    ecModel.filterSeries(function (series) {
      // If in any legend component the status is not selected.
      // Because in legend series is assumed selected when it is not in the legend data.
      for (var i = 0; i < legendModels.length; i++) {
        if (!legendModels[i].isSelected(series.name)) {
          return false;
        }
      }

      return true;
    });
  }
}