Method addEdge

src/data/Graph.ts:108–148

* Add a new edge

(n1: GraphNode | number | string, n2: GraphNode | number | string, dataIndex?: number)

     * Add a new edge
     */
    addEdge(n1: GraphNode | number | string, n2: GraphNode | number | string, dataIndex?: number) {
        const nodesMap = this._nodesMap;
        const edgesMap = this._edgesMap;

        // PENDING
        if (zrUtil.isNumber(n1)) {
            n1 = this.nodes[n1];
        }
        if (zrUtil.isNumber(n2)) {
            n2 = this.nodes[n2];
        }

        if (!(n1 instanceof GraphNode)) {
            n1 = nodesMap[generateNodeKey(n1)];
        }
        if (!(n2 instanceof GraphNode)) {
            n2 = nodesMap[generateNodeKey(n2)];
        }
        if (!n1 || !n2) {
            return;
        }

        const key = n1.id + '-' + n2.id;

        const edge = new GraphEdge(n1, n2, dataIndex);
        edge.hostGraph = this;

        if (this._directed) {
            n1.outEdges.push(edge);
            n2.inEdges.push(edge);
        }
        n1.edges.push(edge);
        if (n1 !== n2) {
            n2.edges.push(edge);
        }

        this.edges.push(edge);
        edgesMap[key] = edge;

        return edge;
    };

    /**
     * Get edge by data index