public/zh/builder/src/echarts/chart/radar/radarLayout.js

/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements.  See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership.  The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License.  You may obtain a copy of the License at
*
*   http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied.  See the License for the
* specific language governing permissions and limitations
* under the License.
*/
import * as zrUtil from 'zrender/src/core/util';
export default function (ecModel) {
  ecModel.eachSeriesByType('radar', function (seriesModel) {
    var data = seriesModel.getData();
    var points = [];
    var coordSys = seriesModel.coordinateSystem;

    if (!coordSys) {
      return;
    }

    var axes = coordSys.getIndicatorAxes();
    zrUtil.each(axes, function (axis, axisIndex) {
      data.each(data.mapDimension(axes[axisIndex].dim), function (val, dataIndex) {
        points[dataIndex] = points[dataIndex] || [];
        var point = coordSys.dataToPoint(val, axisIndex);
        points[dataIndex][axisIndex] = isValidPoint(point) ? point : getValueMissingPoint(coordSys);
      });
    }); // Close polygon

    data.each(function (idx) {
      // TODO
      // Is it appropriate to connect to the next data when some data is missing?
      // Or, should trade it like `connectNull` in line chart?
      var firstPoint = zrUtil.find(points[idx], function (point) {
        return isValidPoint(point);
      }) || getValueMissingPoint(coordSys); // Copy the first actual point to the end of the array

      points[idx].push(firstPoint.slice());
      data.setItemLayout(idx, points[idx]);
    });
  });
}

function isValidPoint(point) {
  return !isNaN(point[0]) && !isNaN(point[1]);
}

function getValueMissingPoint(coordSys) {
  // It is error-prone to input [NaN, NaN] into polygon, polygon.
  // (probably cause problem when refreshing or animating)
  return [coordSys.cx, coordSys.cy];
}