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759 lines
26 KiB
759 lines
26 KiB
let util = require("../../util");
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import NetworkUtil from '../NetworkUtil';
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import Cluster from './components/nodes/Cluster'
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class ClusterEngine {
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constructor(body) {
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this.body = body;
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this.clusteredNodes = {};
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this.clusteredEdges = {};
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this.options = {};
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this.defaultOptions = {};
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util.extend(this.options, this.defaultOptions);
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this.body.emitter.on('_resetData', () => {this.clusteredNodes = {}; this.clusteredEdges = {};})
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}
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setOptions(options) {
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if (options !== undefined) {
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}
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}
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/**
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*
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* @param hubsize
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* @param options
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*/
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clusterByHubsize(hubsize, options) {
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if (hubsize === undefined) {
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hubsize = this._getHubSize();
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}
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else if (typeof(hubsize) === "object") {
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options = this._checkOptions(hubsize);
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hubsize = this._getHubSize();
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}
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let nodesToCluster = [];
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for (let i = 0; i < this.body.nodeIndices.length; i++) {
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let node = this.body.nodes[this.body.nodeIndices[i]];
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if (node.edges.length >= hubsize) {
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nodesToCluster.push(node.id);
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}
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}
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for (let i = 0; i < nodesToCluster.length; i++) {
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this.clusterByConnection(nodesToCluster[i],options,true);
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}
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this.body.emitter.emit('_dataChanged');
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}
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/**
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* loop over all nodes, check if they adhere to the condition and cluster if needed.
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* @param options
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* @param refreshData
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*/
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cluster(options = {}, refreshData = true) {
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if (options.joinCondition === undefined) {throw new Error("Cannot call clusterByNodeData without a joinCondition function in the options.");}
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// check if the options object is fine, append if needed
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options = this._checkOptions(options);
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let childNodesObj = {};
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let childEdgesObj = {};
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// collect the nodes that will be in the cluster
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for (let i = 0; i < this.body.nodeIndices.length; i++) {
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let nodeId = this.body.nodeIndices[i];
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let node = this.body.nodes[nodeId];
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let clonedOptions = NetworkUtil.cloneOptions(node);
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if (options.joinCondition(clonedOptions) === true) {
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childNodesObj[nodeId] = this.body.nodes[nodeId];
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// collect the nodes that will be in the cluster
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for (let i = 0; i < node.edges.length; i++) {
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let edge = node.edges[i];
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if (this.clusteredEdges[edge.id] === undefined) {
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childEdgesObj[edge.id] = edge;
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}
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}
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}
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}
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this._cluster(childNodesObj, childEdgesObj, options, refreshData);
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}
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/**
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* Cluster all nodes in the network that have only X edges
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* @param edgeCount
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* @param options
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* @param refreshData
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*/
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clusterByEdgeCount(edgeCount, options, refreshData = true) {
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options = this._checkOptions(options);
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let clusters = [];
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let usedNodes = {};
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let edge, edges, node, nodeId, relevantEdgeCount;
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// collect the nodes that will be in the cluster
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for (let i = 0; i < this.body.nodeIndices.length; i++) {
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let childNodesObj = {};
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let childEdgesObj = {};
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nodeId = this.body.nodeIndices[i];
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// if this node is already used in another cluster this session, we do not have to re-evaluate it.
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if (usedNodes[nodeId] === undefined) {
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relevantEdgeCount = 0;
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node = this.body.nodes[nodeId];
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edges = [];
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for (let j = 0; j < node.edges.length; j++) {
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edge = node.edges[j];
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if (this.clusteredEdges[edge.id] === undefined) {
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if (edge.toId !== edge.fromId) {
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relevantEdgeCount++;
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}
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edges.push(edge);
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}
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}
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// this node qualifies, we collect its neighbours to start the clustering process.
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if (relevantEdgeCount === edgeCount) {
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let gatheringSuccessful = true;
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for (let j = 0; j < edges.length; j++) {
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edge = edges[j];
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let childNodeId = this._getConnectedId(edge, nodeId);
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// add the nodes to the list by the join condition.
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if (options.joinCondition === undefined) {
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childEdgesObj[edge.id] = edge;
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childNodesObj[nodeId] = this.body.nodes[nodeId];
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childNodesObj[childNodeId] = this.body.nodes[childNodeId];
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usedNodes[nodeId] = true;
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}
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else {
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let clonedOptions = NetworkUtil.cloneOptions(this.body.nodes[nodeId]);
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if (options.joinCondition(clonedOptions) === true) {
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childEdgesObj[edge.id] = edge;
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childNodesObj[nodeId] = this.body.nodes[nodeId];
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usedNodes[nodeId] = true;
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}
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else {
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// this node does not qualify after all.
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gatheringSuccessful = false;
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break;
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}
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}
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}
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// add to the cluster queue
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if (Object.keys(childNodesObj).length > 0 && Object.keys(childEdgesObj).length > 0 && gatheringSuccessful === true) {
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clusters.push({nodes: childNodesObj, edges: childEdgesObj})
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}
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}
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}
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}
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for (let i = 0; i < clusters.length; i++) {
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this._cluster(clusters[i].nodes, clusters[i].edges, options, false)
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}
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if (refreshData === true) {
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this.body.emitter.emit('_dataChanged');
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}
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}
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/**
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* Cluster all nodes in the network that have only 1 edge
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* @param options
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* @param refreshData
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*/
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clusterOutliers(options, refreshData = true) {
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this.clusterByEdgeCount(1,options,refreshData);
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}
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/**
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* Cluster all nodes in the network that have only 2 edge
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* @param options
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* @param refreshData
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*/
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clusterBridges(options, refreshData = true) {
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this.clusterByEdgeCount(2,options,refreshData);
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}
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/**
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* suck all connected nodes of a node into the node.
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* @param nodeId
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* @param options
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* @param refreshData
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*/
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clusterByConnection(nodeId, options, refreshData = true) {
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// kill conditions
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if (nodeId === undefined) {throw new Error("No nodeId supplied to clusterByConnection!");}
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if (this.body.nodes[nodeId] === undefined) {throw new Error("The nodeId given to clusterByConnection does not exist!");}
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let node = this.body.nodes[nodeId];
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options = this._checkOptions(options, node);
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if (options.clusterNodeProperties.x === undefined) {options.clusterNodeProperties.x = node.x;}
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if (options.clusterNodeProperties.y === undefined) {options.clusterNodeProperties.y = node.y;}
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if (options.clusterNodeProperties.fixed === undefined) {
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options.clusterNodeProperties.fixed = {};
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options.clusterNodeProperties.fixed.x = node.options.fixed.x;
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options.clusterNodeProperties.fixed.y = node.options.fixed.y;
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}
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let childNodesObj = {};
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let childEdgesObj = {};
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let parentNodeId = node.id;
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let parentClonedOptions = NetworkUtil.cloneOptions(node);
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childNodesObj[parentNodeId] = node;
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// collect the nodes that will be in the cluster
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for (let i = 0; i < node.edges.length; i++) {
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let edge = node.edges[i];
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if (this.clusteredEdges[edge.id] === undefined) {
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let childNodeId = this._getConnectedId(edge, parentNodeId);
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// if the child node is not in a cluster
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if (this.clusteredNodes[childNodeId] === undefined) {
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if (childNodeId !== parentNodeId) {
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if (options.joinCondition === undefined) {
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childEdgesObj[edge.id] = edge;
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childNodesObj[childNodeId] = this.body.nodes[childNodeId];
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}
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else {
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// clone the options and insert some additional parameters that could be interesting.
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let childClonedOptions = NetworkUtil.cloneOptions(this.body.nodes[childNodeId]);
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if (options.joinCondition(parentClonedOptions, childClonedOptions) === true) {
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childEdgesObj[edge.id] = edge;
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childNodesObj[childNodeId] = this.body.nodes[childNodeId];
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}
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}
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}
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else {
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// swallow the edge if it is self-referencing.
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childEdgesObj[edge.id] = edge;
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}
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}
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}
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}
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this._cluster(childNodesObj, childEdgesObj, options, refreshData);
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}
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/**
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* This function creates the edges that will be attached to the cluster
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* It looks for edges that are connected to the nodes from the "outside' of the cluster.
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*
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* @param childNodesObj
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* @param childEdgesObj
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* @param clusterNodeProperties
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* @param clusterEdgeProperties
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* @private
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*/
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_createClusterEdges (childNodesObj, childEdgesObj, clusterNodeProperties, clusterEdgeProperties) {
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let edge, childNodeId, childNode, toId, fromId, otherNodeId;
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// loop over all child nodes and their edges to find edges going out of the cluster
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// these edges will be replaced by clusterEdges.
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let childKeys = Object.keys(childNodesObj);
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let createEdges = [];
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for (let i = 0; i < childKeys.length; i++) {
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childNodeId = childKeys[i];
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childNode = childNodesObj[childNodeId];
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// construct new edges from the cluster to others
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for (let j = 0; j < childNode.edges.length; j++) {
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edge = childNode.edges[j];
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// we only handle edges that are visible to the system, not the disabled ones from the clustering process.
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if (this.clusteredEdges[edge.id] === undefined) {
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// self-referencing edges will be added to the "hidden" list
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if (edge.toId == edge.fromId) {
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childEdgesObj[edge.id] = edge;
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}
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else {
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// set up the from and to.
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if (edge.toId == childNodeId) { // this is a double equals because ints and strings can be interchanged here.
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toId = clusterNodeProperties.id;
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fromId = edge.fromId;
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otherNodeId = fromId;
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}
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else {
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toId = edge.toId;
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fromId = clusterNodeProperties.id;
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otherNodeId = toId;
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}
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}
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// Only edges from the cluster outwards are being replaced.
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if (childNodesObj[otherNodeId] === undefined) {
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createEdges.push({edge: edge, fromId: fromId, toId: toId});
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}
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}
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}
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}
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// here we actually create the replacement edges. We could not do this in the loop above as the creation process
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// would add an edge to the edges array we are iterating over.
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for (let j = 0; j < createEdges.length; j++) {
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let edge = createEdges[j].edge;
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// copy the options of the edge we will replace
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let clonedOptions = NetworkUtil.cloneOptions(edge, 'edge');
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// make sure the properties of clusterEdges are superimposed on it
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util.deepExtend(clonedOptions, clusterEdgeProperties);
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// set up the edge
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clonedOptions.from = createEdges[j].fromId;
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clonedOptions.to = createEdges[j].toId;
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clonedOptions.id = 'clusterEdge:' + util.randomUUID();
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//clonedOptions.id = '(cf: ' + createEdges[j].fromId + " to: " + createEdges[j].toId + ")" + Math.random();
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// create the edge and give a reference to the one it replaced.
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let newEdge = this.body.functions.createEdge(clonedOptions);
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newEdge.clusteringEdgeReplacingId = edge.id;
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// connect the edge.
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this.body.edges[newEdge.id] = newEdge;
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newEdge.connect();
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// hide the replaced edge
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this._backupEdgeOptions(edge);
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edge.setOptions({physics:false, hidden:true});
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}
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}
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/**
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* This function checks the options that can be supplied to the different cluster functions
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* for certain fields and inserts defaults if needed
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* @param options
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* @returns {*}
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* @private
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*/
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_checkOptions(options = {}) {
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if (options.clusterEdgeProperties === undefined) {options.clusterEdgeProperties = {};}
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if (options.clusterNodeProperties === undefined) {options.clusterNodeProperties = {};}
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return options;
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}
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/**
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*
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* @param {Object} childNodesObj | object with node objects, id as keys, same as childNodes except it also contains a source node
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* @param {Object} childEdgesObj | object with edge objects, id as keys
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* @param {Array} options | object with {clusterNodeProperties, clusterEdgeProperties, processProperties}
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* @param {Boolean} refreshData | when true, do not wrap up
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* @private
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*/
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_cluster(childNodesObj, childEdgesObj, options, refreshData = true) {
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// kill condition: no children so can't cluster or only one node in the cluster, don't bother
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if (Object.keys(childNodesObj).length < 2) {return;}
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// check if this cluster call is not trying to cluster anything that is in another cluster.
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for (let nodeId in childNodesObj) {
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if (childNodesObj.hasOwnProperty(nodeId)) {
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if (this.clusteredNodes[nodeId] !== undefined) {
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return;
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}
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}
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}
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let clusterNodeProperties = util.deepExtend({},options.clusterNodeProperties);
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// construct the clusterNodeProperties
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if (options.processProperties !== undefined) {
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// get the childNode options
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let childNodesOptions = [];
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for (let nodeId in childNodesObj) {
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if (childNodesObj.hasOwnProperty(nodeId)) {
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let clonedOptions = NetworkUtil.cloneOptions(childNodesObj[nodeId]);
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childNodesOptions.push(clonedOptions);
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}
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}
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// get cluster properties based on childNodes
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let childEdgesOptions = [];
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for (let edgeId in childEdgesObj) {
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if (childEdgesObj.hasOwnProperty(edgeId)) {
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// these cluster edges will be removed on creation of the cluster.
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if (edgeId.substr(0, 12) !== "clusterEdge:") {
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let clonedOptions = NetworkUtil.cloneOptions(childEdgesObj[edgeId], 'edge');
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childEdgesOptions.push(clonedOptions);
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}
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}
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}
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clusterNodeProperties = options.processProperties(clusterNodeProperties, childNodesOptions, childEdgesOptions);
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if (!clusterNodeProperties) {
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throw new Error("The processProperties function does not return properties!");
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}
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}
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// check if we have an unique id;
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if (clusterNodeProperties.id === undefined) {clusterNodeProperties.id = 'cluster:' + util.randomUUID();}
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let clusterId = clusterNodeProperties.id;
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if (clusterNodeProperties.label === undefined) {
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clusterNodeProperties.label = 'cluster';
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}
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// give the clusterNode a position if it does not have one.
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let pos = undefined;
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if (clusterNodeProperties.x === undefined) {
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pos = this._getClusterPosition(childNodesObj);
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clusterNodeProperties.x = pos.x;
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}
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if (clusterNodeProperties.y === undefined) {
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if (pos === undefined) {pos = this._getClusterPosition(childNodesObj);}
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clusterNodeProperties.y = pos.y;
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}
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// force the ID to remain the same
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clusterNodeProperties.id = clusterId;
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// create the clusterNode
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let clusterNode = this.body.functions.createNode(clusterNodeProperties, Cluster);
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clusterNode.isCluster = true;
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clusterNode.containedNodes = childNodesObj;
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clusterNode.containedEdges = childEdgesObj;
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// cache a copy from the cluster edge properties if we have to reconnect others later on
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clusterNode.clusterEdgeProperties = options.clusterEdgeProperties;
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// finally put the cluster node into global
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this.body.nodes[clusterNodeProperties.id] = clusterNode;
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// create the new edges that will connect to the cluster, all self-referencing edges will be added to childEdgesObject here.
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this._createClusterEdges(childNodesObj, childEdgesObj, clusterNodeProperties, options.clusterEdgeProperties);
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// disable the childEdges
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for (let edgeId in childEdgesObj) {
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if (childEdgesObj.hasOwnProperty(edgeId)) {
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if (this.body.edges[edgeId] !== undefined) {
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let edge = this.body.edges[edgeId];
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// cache the options before changing
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this._backupEdgeOptions(edge);
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// disable physics and hide the edge
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edge.setOptions({physics:false, hidden:true});
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}
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}
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}
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// disable the childNodes
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for (let nodeId in childNodesObj) {
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if (childNodesObj.hasOwnProperty(nodeId)) {
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this.clusteredNodes[nodeId] = {clusterId:clusterNodeProperties.id, node: this.body.nodes[nodeId]};
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this.body.nodes[nodeId].setOptions({hidden:true, physics:false});
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}
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}
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// set ID to undefined so no duplicates arise
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clusterNodeProperties.id = undefined;
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// wrap up
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if (refreshData === true) {
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this.body.emitter.emit('_dataChanged');
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}
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}
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_backupEdgeOptions(edge) {
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if (this.clusteredEdges[edge.id] === undefined) {
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this.clusteredEdges[edge.id] = {physics: edge.options.physics, hidden: edge.options.hidden};
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}
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}
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_restoreEdge(edge) {
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let originalOptions = this.clusteredEdges[edge.id];
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if (originalOptions !== undefined) {
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edge.setOptions({physics: originalOptions.physics, hidden: originalOptions.hidden});
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delete this.clusteredEdges[edge.id];
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}
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}
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/**
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* Check if a node is a cluster.
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* @param nodeId
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* @returns {*}
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*/
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isCluster(nodeId) {
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if (this.body.nodes[nodeId] !== undefined) {
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return this.body.nodes[nodeId].isCluster === true;
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}
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else {
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console.log("Node does not exist.");
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return false;
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}
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}
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/**
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* get the position of the cluster node based on what's inside
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* @param {object} childNodesObj | object with node objects, id as keys
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* @returns {{x: number, y: number}}
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* @private
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*/
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_getClusterPosition(childNodesObj) {
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let childKeys = Object.keys(childNodesObj);
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let minX = childNodesObj[childKeys[0]].x;
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let maxX = childNodesObj[childKeys[0]].x;
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let minY = childNodesObj[childKeys[0]].y;
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let maxY = childNodesObj[childKeys[0]].y;
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let node;
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for (let i = 1; i < childKeys.length; i++) {
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node = childNodesObj[childKeys[i]];
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minX = node.x < minX ? node.x : minX;
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maxX = node.x > maxX ? node.x : maxX;
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minY = node.y < minY ? node.y : minY;
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maxY = node.y > maxY ? node.y : maxY;
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}
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return {x: 0.5*(minX + maxX), y: 0.5*(minY + maxY)};
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}
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/**
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* Open a cluster by calling this function.
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* @param {String} clusterNodeId | the ID of the cluster node
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* @param {Boolean} refreshData | wrap up afterwards if not true
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*/
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openCluster(clusterNodeId, options, refreshData = true) {
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// kill conditions
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if (clusterNodeId === undefined) {throw new Error("No clusterNodeId supplied to openCluster.");}
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if (this.body.nodes[clusterNodeId] === undefined) {throw new Error("The clusterNodeId supplied to openCluster does not exist.");}
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if (this.body.nodes[clusterNodeId].containedNodes === undefined) {
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|
console.log("The node:" + clusterNodeId + " is not a cluster.");
|
|
return
|
|
}
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|
let clusterNode = this.body.nodes[clusterNodeId];
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|
let containedNodes = clusterNode.containedNodes;
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|
let containedEdges = clusterNode.containedEdges;
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|
|
|
// allow the user to position the nodes after release.
|
|
if (options !== undefined && options.releaseFunction !== undefined && typeof options.releaseFunction === 'function') {
|
|
let positions = {};
|
|
let clusterPosition = {x:clusterNode.x, y:clusterNode.y};
|
|
for (let nodeId in containedNodes) {
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|
if (containedNodes.hasOwnProperty(nodeId)) {
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|
let containedNode = this.body.nodes[nodeId];
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|
positions[nodeId] = {x: containedNode.x, y: containedNode.y};
|
|
}
|
|
}
|
|
let newPositions = options.releaseFunction(clusterPosition, positions);
|
|
|
|
for (let nodeId in containedNodes) {
|
|
if (containedNodes.hasOwnProperty(nodeId)) {
|
|
let containedNode = this.body.nodes[nodeId];
|
|
if (newPositions[nodeId] !== undefined) {
|
|
containedNode.x = (newPositions[nodeId].x === undefined ? clusterNode.x : newPositions[nodeId].x);
|
|
containedNode.y = (newPositions[nodeId].y === undefined ? clusterNode.y : newPositions[nodeId].y);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
else {
|
|
// copy the position from the cluster
|
|
for (let nodeId in containedNodes) {
|
|
if (containedNodes.hasOwnProperty(nodeId)) {
|
|
let containedNode = this.body.nodes[nodeId];
|
|
containedNode = containedNodes[nodeId];
|
|
// inherit position
|
|
if (containedNode.options.fixed.x === false) {containedNode.x = clusterNode.x;}
|
|
if (containedNode.options.fixed.y === false) {containedNode.y = clusterNode.y;}
|
|
}
|
|
}
|
|
}
|
|
|
|
// release nodes
|
|
for (let nodeId in containedNodes) {
|
|
if (containedNodes.hasOwnProperty(nodeId)) {
|
|
let containedNode = this.body.nodes[nodeId];
|
|
|
|
// inherit speed
|
|
containedNode.vx = clusterNode.vx;
|
|
containedNode.vy = clusterNode.vy;
|
|
|
|
// we use these methods to avoid re-instantiating the shape, which happens with setOptions.
|
|
containedNode.setOptions({hidden:false, physics:true});
|
|
|
|
delete this.clusteredNodes[nodeId];
|
|
}
|
|
}
|
|
|
|
// copy the clusterNode edges because we cannot iterate over an object that we add or remove from.
|
|
let edgesToBeDeleted = [];
|
|
for (let i = 0; i < clusterNode.edges.length; i++) {
|
|
edgesToBeDeleted.push(clusterNode.edges[i]);
|
|
}
|
|
|
|
// actually handling the deleting.
|
|
for (let i = 0; i < edgesToBeDeleted.length; i++) {
|
|
let edge = edgesToBeDeleted[i];
|
|
|
|
let otherNodeId = this._getConnectedId(edge, clusterNodeId);
|
|
// if the other node is in another cluster, we transfer ownership of this edge to the other cluster
|
|
if (this.clusteredNodes[otherNodeId] !== undefined) {
|
|
// transfer ownership:
|
|
let otherCluster = this.body.nodes[this.clusteredNodes[otherNodeId].clusterId];
|
|
let transferEdge = this.body.edges[edge.clusteringEdgeReplacingId];
|
|
if (transferEdge !== undefined) {
|
|
otherCluster.containedEdges[transferEdge.id] = transferEdge;
|
|
|
|
// delete local reference
|
|
delete containedEdges[transferEdge.id];
|
|
|
|
// create new cluster edge from the otherCluster:
|
|
// get to and from
|
|
let fromId = transferEdge.fromId;
|
|
let toId = transferEdge.toId;
|
|
if (transferEdge.toId == otherNodeId) {
|
|
toId = this.clusteredNodes[otherNodeId].clusterId;
|
|
}
|
|
else {
|
|
fromId = this.clusteredNodes[otherNodeId].clusterId;
|
|
}
|
|
|
|
// clone the options and apply the cluster options to them
|
|
let clonedOptions = NetworkUtil.cloneOptions(transferEdge, 'edge');
|
|
util.deepExtend(clonedOptions, otherCluster.clusterEdgeProperties);
|
|
|
|
// apply the edge specific options to it.
|
|
let id = 'clusterEdge:' + util.randomUUID();
|
|
util.deepExtend(clonedOptions, {from: fromId, to: toId, hidden: false, physics: true, id: id});
|
|
|
|
// create it
|
|
let newEdge = this.body.functions.createEdge(clonedOptions);
|
|
newEdge.clusteringEdgeReplacingId = transferEdge.id;
|
|
this.body.edges[id] = newEdge;
|
|
this.body.edges[id].connect();
|
|
}
|
|
}
|
|
else {
|
|
let replacedEdge = this.body.edges[edge.clusteringEdgeReplacingId];
|
|
if (replacedEdge !== undefined) {
|
|
this._restoreEdge(replacedEdge);
|
|
}
|
|
}
|
|
edge.cleanup();
|
|
// this removes the edge from node.edges, which is why edgeIds is formed
|
|
edge.disconnect();
|
|
delete this.body.edges[edge.id];
|
|
}
|
|
|
|
// handle the releasing of the edges
|
|
for (let edgeId in containedEdges) {
|
|
if (containedEdges.hasOwnProperty(edgeId)) {
|
|
this._restoreEdge(containedEdges[edgeId]);
|
|
}
|
|
}
|
|
|
|
// remove clusterNode
|
|
delete this.body.nodes[clusterNodeId];
|
|
|
|
if (refreshData === true) {
|
|
this.body.emitter.emit('_dataChanged');
|
|
}
|
|
}
|
|
|
|
getNodesInCluster(clusterId) {
|
|
let nodesArray = [];
|
|
if (this.isCluster(clusterId) === true) {
|
|
let containedNodes = this.body.nodes[clusterId].containedNodes;
|
|
for (let nodeId in containedNodes) {
|
|
if (containedNodes.hasOwnProperty(nodeId)) {
|
|
nodesArray.push(this.body.nodes[nodeId].id)
|
|
}
|
|
}
|
|
}
|
|
|
|
return nodesArray;
|
|
}
|
|
|
|
/**
|
|
* Get the stack clusterId's that a certain node resides in. cluster A -> cluster B -> cluster C -> node
|
|
* @param nodeId
|
|
* @returns {Array}
|
|
*/
|
|
findNode(nodeId) {
|
|
let stack = [];
|
|
let max = 100;
|
|
let counter = 0;
|
|
|
|
while (this.clusteredNodes[nodeId] !== undefined && counter < max) {
|
|
stack.push(this.body.nodes[nodeId].id);
|
|
nodeId = this.clusteredNodes[nodeId].clusterId;
|
|
counter++;
|
|
}
|
|
stack.push(this.body.nodes[nodeId].id);
|
|
stack.reverse();
|
|
|
|
return stack;
|
|
}
|
|
|
|
|
|
/**
|
|
* Get the Id the node is connected to
|
|
* @param edge
|
|
* @param nodeId
|
|
* @returns {*}
|
|
* @private
|
|
*/
|
|
_getConnectedId(edge, nodeId) {
|
|
if (edge.toId != nodeId) {
|
|
return edge.toId;
|
|
}
|
|
else if (edge.fromId != nodeId) {
|
|
return edge.fromId;
|
|
}
|
|
else {
|
|
return edge.fromId;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* We determine how many connections denote an important hub.
|
|
* We take the mean + 2*std as the important hub size. (Assuming a normal distribution of data, ~2.2%)
|
|
*
|
|
* @private
|
|
*/
|
|
_getHubSize() {
|
|
let average = 0;
|
|
let averageSquared = 0;
|
|
let hubCounter = 0;
|
|
let largestHub = 0;
|
|
|
|
for (let i = 0; i < this.body.nodeIndices.length; i++) {
|
|
let node = this.body.nodes[this.body.nodeIndices[i]];
|
|
if (node.edges.length > largestHub) {
|
|
largestHub = node.edges.length;
|
|
}
|
|
average += node.edges.length;
|
|
averageSquared += Math.pow(node.edges.length,2);
|
|
hubCounter += 1;
|
|
}
|
|
average = average / hubCounter;
|
|
averageSquared = averageSquared / hubCounter;
|
|
|
|
let variance = averageSquared - Math.pow(average,2);
|
|
let standardDeviation = Math.sqrt(variance);
|
|
|
|
let hubThreshold = Math.floor(average + 2*standardDeviation);
|
|
|
|
// always have at least one to cluster
|
|
if (hubThreshold > largestHub) {
|
|
hubThreshold = largestHub;
|
|
}
|
|
|
|
return hubThreshold;
|
|
};
|
|
|
|
}
|
|
|
|
|
|
export default ClusterEngine;
|