src/chart/graph/GraphSeries.js

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define(function (require) {

    'use strict';

    var List = require('../../data/List');
    var zrUtil = require('zrender/core/util');
    var modelUtil = require('../../util/model');
    var Model = require('../../model/Model');

    var createGraphFromNodeEdge = require('../helper/createGraphFromNodeEdge');

    var GraphSeries = require('../../echarts').extendSeriesModel({

        type: 'series.graph',

        init: function (option) {
            GraphSeries.superApply(this, 'init', arguments);

            // Provide data for legend select
            this.legendDataProvider = function () {
                return this._categoriesData;
            };

            this.fillDataTextStyle(option.edges || option.links);

            this._updateCategoriesData();
        },

        mergeOption: function (option) {
            GraphSeries.superApply(this, 'mergeOption', arguments);

            this.fillDataTextStyle(option.edges || option.links);

            this._updateCategoriesData();
        },

        mergeDefaultAndTheme: function (option) {
            GraphSeries.superApply(this, 'mergeDefaultAndTheme', arguments);
            modelUtil.defaultEmphasis(option.edgeLabel, modelUtil.LABEL_OPTIONS);
        },

        getInitialData: function (option, ecModel) {
            var edges = option.edges || option.links || [];
            var nodes = option.data || option.nodes || [];
            var self = this;

            if (nodes && edges) {
                return createGraphFromNodeEdge(nodes, edges, this, true, beforeLink).data;
            }

            function beforeLink(nodeData, edgeData) {
                // Overwrite nodeData.getItemModel to
                nodeData.wrapMethod('getItemModel', function (model) {
                    var categoriesModels = self._categoriesModels;
                    var categoryIdx = model.getShallow('category');
                    var categoryModel = categoriesModels[categoryIdx];
                    if (categoryModel) {
                        categoryModel.parentModel = model.parentModel;
                        model.parentModel = categoryModel;
                    }