src/chart/boxplot/boxplotLayout.js

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define(function (require) {

    var zrUtil = require('zrender/core/util');
    var numberUtil = require('../../util/number');
    var parsePercent = numberUtil.parsePercent;
    var each = zrUtil.each;

    return function (ecModel) {

        var groupResult = groupSeriesByAxis(ecModel);

        each(groupResult, function (groupItem) {
            var seriesModels = groupItem.seriesModels;

            if (!seriesModels.length) {
                return;
            }

            calculateBase(groupItem);

            each(seriesModels, function (seriesModel, idx) {
                layoutSingleSeries(
                    seriesModel,
                    groupItem.boxOffsetList[idx],
                    groupItem.boxWidthList[idx]
                );
            });
        });
    };

    /**
     * Group series by axis.
     */
    function groupSeriesByAxis(ecModel) {
        var result = [];
        var axisList = [];

        ecModel.eachSeriesByType('boxplot', function (seriesModel) {
            var baseAxis = seriesModel.getBaseAxis();
            var idx = zrUtil.indexOf(axisList, baseAxis);

            if (idx < 0) {
                idx = axisList.length;
                axisList[idx] = baseAxis;
                result[idx] = {axis: baseAxis, seriesModels: []};
            }

            result[idx].seriesModels.push(seriesModel);
        });

        return result;
    }

    /**
     * Calculate offset and box width for each series.
     */
    function calculateBase(groupItem) {
        var extent;
        var baseAxis = groupItem.axis;
        var seriesModels = groupItem.seriesModels;