PVS-CHAT/utils/graph.ts

import type { EdgeData, GraphData, ID } from '@antv/g6';
import { idOf } from '@antv/g6';
import { groupBy, pick } from 'lodash';

/**
 * Reassign the layout style to the original graph data
 * @param model - original graph data
 * @param layoutResult - layout result
 */
export function reassignLayoutStyle(model: GraphData, layoutResult: GraphData) {
  layoutResult.nodes?.forEach(layoutNode => {
    const modelNode = model.nodes?.find(node => node.id === layoutNode.id);
    if (modelNode?.style) Object.assign(modelNode.style || {}, pick(layoutNode.style, ['x', 'y', 'z']));
  });
}

/**
 * Calculate node size based on degree
 * @param degree - degree of the node
 * @param minSize - minimum size of the node
 * @param maxSize - maximum size of the node
 * @param minDegree - minimum degree
 * @param maxDegree - maximum degree
 * @returns size of the node
 */
export function getSize(degree: number, minSize = 24, maxSize = 60, minDegree = 1, maxDegree = 10): number {
  const _degree = Math.max(minDegree, Math.min(maxDegree, degree));

  const size = minSize + ((_degree - minDegree) / (maxDegree - minDegree)) * (maxSize - minSize);

  return size;
}

/**
 * Get node degree, means the number of edges connected to the node
 * @param edges - all edges data
 * @param nodeId - node id
 * @returns degree of the node
 */
export function getDegree(edges: EdgeData[], nodeId: ID) {
  return getRelatedEdgesData(edges, nodeId).length;
}

/**
 * Get related edges data of a node
 * @param edges - all edges data
 * @param nodeId - node id
 * @returns related edges data
 */
export function getRelatedEdgesData(edges: EdgeData[], nodeId: ID) {
  return edges.filter(edge => edge.source === nodeId || edge.target === nodeId);
}

/**
 * Concatenate the labels of the related edges to the node as the node's edge key
 * @param edges - all edges data
 * @param nodeId - node id
 * @returns edge key
 */
export function getCommunityId(edges: EdgeData[], nodeId: ID) {
  const relatedEdges = getRelatedEdgesData(edges, nodeId);
  const key = relatedEdges
    .map(edge => {
      const direction = edge.source === nodeId ? '->' : '<-';
      const otherEnd = edge.source === nodeId ? edge.target : edge.source;
      return `${direction}_${edge.data!.label}_${otherEnd}`;
    })
    .sort()
    .join('+');
  return key;
}

/**
 * Whether the node is in a community(same communityId) with more than `limit` nodes
 * @param data - graph data
 * @param nodeId - node id
 * @param limit - limit
 * @returns boolean
 */
export function isInCommunity(data: GraphData, nodeId: string, limit = 2) {
  const groupedNodes = groupBy(data.nodes, node => node.data!.communityId);
  const filtered = Object.values(groupedNodes).find(nodes => nodes.map(idOf).includes(nodeId))!;
  return filtered.length > limit;
}