echarts/src/chart/helper/createGraphFromNodeEdge.js

A powerful charting and visualization library for browser

import * as zrUtil from 'zrender/src/core/util';
import List from '../../data/List';
import Graph from '../../data/Graph';
import linkList from '../../data/helper/linkList';
import createDimensions from '../../data/helper/createDimensions';
import CoordinateSystem from '../../CoordinateSystem';
import createListFromArray from './createListFromArray';

export default function (nodes, edges, seriesModel, directed, beforeLink) {
    // ??? TODO
    // support dataset?
    var graph = new Graph(directed);
    for (var i = 0; i < nodes.length; i++) {
        graph.addNode(zrUtil.retrieve(
            // Id, name, dataIndex
            nodes[i].id, nodes[i].name, i
        ), i);
    }

    var linkNameList = [];
    var validEdges = [];
    var linkCount = 0;
    for (var i = 0; i < edges.length; i++) {
        var link = edges[i];
        var source = link.source;
        var target = link.target;
        // addEdge may fail when source or target not exists
        if (graph.addEdge(source, target, linkCount)) {
            validEdges.push(link);
            linkNameList.push(zrUtil.retrieve(link.id, source + ' > ' + target));
            linkCount++;
        }
    }

    var coordSys = seriesModel.get('coordinateSystem');
    var nodeData;
    if (coordSys === 'cartesian2d' || coordSys === 'polar') {
        nodeData = createListFromArray(nodes, seriesModel);
    }
    else {
        // FIXME
        var coordSysCtor = CoordinateSystem.get(coordSys);
        // FIXME
        var dimensionNames = createDimensions(nodes, {
            coordDimensions: (
                (coordSysCtor && coordSysCtor.type !== 'view')
                    ? (coordSysCtor.dimensions || []) : []
            ).concat(['value'])
        });
        nodeData = new List(dimensionNames, seriesModel);
        nodeData.initData(nodes);
    }

    var edgeData = new List(['value'], seriesModel);
    edgeData.initData(validEdges, linkNameList);

    beforeLink && beforeLink(nodeData, edgeData);

    linkList({
        mainData: nodeData,
        struct: graph,
        structAttr: 'graph',
        datas: {node: nodeData, edge: edgeData},
        datasAttr: {node: 'data', edge: 'edgeData'}
    });

    // Update dataIndex of nodes and edges because invalid edge may be removed
    graph.update();

    return graph;
}