en/builder/src/echarts3/component/marker/markerHelper.js

import * as zrUtil from 'zrender/src/core/util';
import * as numberUtil from '../../util/number';
var indexOf = zrUtil.indexOf;

function hasXOrY(item) {
  return !(isNaN(parseFloat(item.x)) && isNaN(parseFloat(item.y)));
}

function hasXAndY(item) {
  return !isNaN(parseFloat(item.x)) && !isNaN(parseFloat(item.y));
}

function getPrecision(data, valueAxisDim, dataIndex) {
  var precision = -1;

  do {
    precision = Math.max(numberUtil.getPrecision(data.get(valueAxisDim, dataIndex)), precision);
    data = data.stackedOn;
  } while (data);

  return precision;
}

function markerTypeCalculatorWithExtent(mlType, data, otherDataDim, targetDataDim, otherCoordIndex, targetCoordIndex) {
  var coordArr = [];
  var value = numCalculate(data, targetDataDim, mlType);
  var dataIndex = data.indicesOfNearest(targetDataDim, value, true)[0];
  coordArr[otherCoordIndex] = data.get(otherDataDim, dataIndex, true);
  coordArr[targetCoordIndex] = data.get(targetDataDim, dataIndex, true);
  var precision = getPrecision(data, targetDataDim, dataIndex);
  precision = Math.min(precision, 20);

  if (precision >= 0) {
    coordArr[targetCoordIndex] = +coordArr[targetCoordIndex].toFixed(precision);
  }

  return coordArr;
}

var curry = zrUtil.curry; // TODO Specified percent

var markerTypeCalculator = {
  /**
   * @method
   * @param {module:echarts/data/List} data
   * @param {string} baseAxisDim
   * @param {string} valueAxisDim
   */
  min: curry(markerTypeCalculatorWithExtent, 'min'),

  /**
   * @method
   * @param {module:echarts/data/List} data
   * @param {string} baseAxisDim
   * @param {string} valueAxisDim
   */
  max: curry(markerTypeCalculatorWithExtent, 'max'),

  /**
   * @method
   * @param {module:echarts/data/List} data
   * @param {string} baseAxisDim
   * @param {string} valueAxisDim
   */
  average: curry(markerTypeCalculatorWithExtent, 'average')
};
/**
 * Transform markPoint data item to format used in List by do the following
 * 1. Calculate statistic like `max`, `min`, `average`
 * 2. Convert `item.xAxis`, `item.yAxis` to `item.coord` array
 * @param  {module:echarts/model/Series} seriesModel
 * @param  {module:echarts/coord/*} [coordSys]
 * @param  {Object} item
 * @return {Object}
 */

export function dataTransform(seriesModel, item) {
  var data = seriesModel.getData();
  var coordSys = seriesModel.coordinateSystem; // 1. If not specify the position with pixel directly
  // 2. If `coord` is not a data array. Which uses `xAxis`,
  // `yAxis` to specify the coord on each dimension
  // parseFloat first because item.x and item.y can be percent string like '20%'

  if (item && !hasXAndY(item) && !zrUtil.isArray(item.coord) && coordSys) {
    var dims = coordSys.dimensions;
    var axisInfo = getAxisInfo(item, data, coordSys, seriesModel); // Clone the option
    // Transform the properties xAxis, yAxis, radiusAxis, angleAxis, geoCoord to value

    item = zrUtil.clone(item);

    if (item.type && markerTypeCalculator[item.type] && axisInfo.baseAxis && axisInfo.valueAxis) {
      var otherCoordIndex = indexOf(dims, axisInfo.baseAxis.dim);
      var targetCoordIndex = indexOf(dims, axisInfo.valueAxis.dim);
      item.coord = markerTypeCalculator[item.type](data, axisInfo.baseDataDim, axisInfo.valueDataDim, otherCoordIndex, targetCoordIndex); // Force to use the value of calculated value.

      item.value = item.coord[targetCoordIndex];
    } else {
      // FIXME Only has one of xAxis and yAxis.
      var coord = [item.xAxis != null ? item.xAxis : item.radiusAxis, item.yAxis != null ? item.yAxis : item.angleAxis]; // Each coord support max, min, average

      for (var i = 0; i < 2; i++) {
        if (markerTypeCalculator[coord[i]]) {
          var dataDim = seriesModel.coordDimToDataDim(dims[i])[0];
          coord[i] = numCalculate(data, dataDim, coord[i]);
        }
      }

      item.coord = coord;
    }
  }

  return item;
}
export function getAxisInfo(item, data, coordSys, seriesModel) {
  var ret = {};

  if (item.valueIndex != null || item.valueDim != null) {
    ret.valueDataDim = item.valueIndex != null ? data.getDimension(item.valueIndex) : item.valueDim;
    ret.valueAxis = coordSys.getAxis(seriesModel.dataDimToCoordDim(ret.valueDataDim));
    ret.baseAxis = coordSys.getOtherAxis(ret.valueAxis);
    ret.baseDataDim = seriesModel.coordDimToDataDim(ret.baseAxis.dim)[0];
  } else {
    ret.baseAxis = seriesModel.getBaseAxis();
    ret.valueAxis = coordSys.getOtherAxis(ret.baseAxis);
    ret.baseDataDim = seriesModel.coordDimToDataDim(ret.baseAxis.dim)[0];
    ret.valueDataDim = seriesModel.coordDimToDataDim(ret.valueAxis.dim)[0];
  }

  return ret;
}
/**
 * Filter data which is out of coordinateSystem range
 * [dataFilter description]
 * @param  {module:echarts/coord/*} [coordSys]
 * @param  {Object} item
 * @return {boolean}
 */

export function dataFilter(coordSys, item) {
  // Alwalys return true if there is no coordSys
  return coordSys && coordSys.containData && item.coord && !hasXOrY(item) ? coordSys.containData(item.coord) : true;
}
export function dimValueGetter(item, dimName, dataIndex, dimIndex) {
  // x, y, radius, angle
  if (dimIndex < 2) {
    return item.coord && item.coord[dimIndex];
  }

  return item.value;
}
export function numCalculate(data, valueDataDim, type) {
  if (type === 'average') {
    var sum = 0;
    var count = 0;
    data.each(valueDataDim, function (val, idx) {
      if (!isNaN(val)) {
        sum += val;
        count++;
      }
    }, true);
    return sum / count;
  } else {
    return data.getDataExtent(valueDataDim, true)[type === 'max' ? 1 : 0];
  }
}