zh/builder/src/echarts3/chart/map/mapSymbolLayout.js

import * as zrUtil from 'zrender/src/core/util';
export default function (ecModel) {
  var processedMapType = {};
  ecModel.eachSeriesByType('map', function (mapSeries) {
    var mapType = mapSeries.getMapType();

    if (mapSeries.getHostGeoModel() || processedMapType[mapType]) {
      return;
    }

    var mapSymbolOffsets = {};
    zrUtil.each(mapSeries.seriesGroup, function (subMapSeries) {
      var geo = subMapSeries.coordinateSystem;
      var data = subMapSeries.originalData;

      if (subMapSeries.get('showLegendSymbol') && ecModel.getComponent('legend')) {
        data.each('value', function (value, idx) {
          var name = data.getName(idx);
          var region = geo.getRegion(name); // If input series.data is [11, 22, '-'/null/undefined, 44],
          // it will be filled with NaN: [11, 22, NaN, 44] and NaN will
          // not be drawn. So here must validate if value is NaN.

          if (!region || isNaN(value)) {
            return;
          }

          var offset = mapSymbolOffsets[name] || 0;
          var point = geo.dataToPoint(region.center);
          mapSymbolOffsets[name] = offset + 1;
          data.setItemLayout(idx, {
            point: point,
            offset: offset
          });
        });
      }
    }); // Show label of those region not has legendSymbol(which is offset 0)

    var data = mapSeries.getData();
    data.each(function (idx) {
      var name = data.getName(idx);
      var layout = data.getItemLayout(idx) || {};
      layout.showLabel = !mapSymbolOffsets[name];
      data.setItemLayout(idx, layout);
    });
    processedMapType[mapType] = true;
  });
}