vis.js is a dynamic, browser-based visualization library
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/**
* Created by Alex on 10-Aug-15.
*/
class FloydWarshall {
constructor(){}
getDistances(body, nodesArray, edgesArray) {
let D_matrix = {};
let edges = body.edges;
// prepare matrix with large numbers
for (let i = 0; i < nodesArray.length; i++) {
D_matrix[nodesArray[i]] = {};
D_matrix[nodesArray[i]] = {};
for (let j = 0; j < nodesArray.length; j++) {
D_matrix[nodesArray[i]][nodesArray[j]] = (i == j ? 0 : 1e9);
D_matrix[nodesArray[i]][nodesArray[j]] = (i == j ? 0 : 1e9);
}
}
// put the weights for the edges in. This assumes unidirectionality.
for (let i = 0; i < edgesArray.length; i++) {
let edge = edges[edgesArray[i]];
// edge has to be connected if it counts to the distances. If it is connected to inner clusters it will crash so we also check if it is in the D_matrix
if (edge.connected === true && D_matrix[edge.fromId] !== undefined && D_matrix[edge.toId] !== undefined) {
D_matrix[edge.fromId][edge.toId] = 1;
D_matrix[edge.toId][edge.fromId] = 1;
}
}
let nodeCount = nodesArray.length;
// Adapted FloydWarshall based on unidirectionality to greatly reduce complexity.
for (let k = 0; k < nodeCount; k++) {
for (let i = 0; i < nodeCount-1; i++) {
for (let j = i+1; j < nodeCount; j++) {
D_matrix[nodesArray[i]][nodesArray[j]] = Math.min(D_matrix[nodesArray[i]][nodesArray[j]],D_matrix[nodesArray[i]][nodesArray[k]] + D_matrix[nodesArray[k]][nodesArray[j]])
D_matrix[nodesArray[j]][nodesArray[i]] = D_matrix[nodesArray[i]][nodesArray[j]];
}
}
}
return D_matrix;
}
}
export default FloydWarshall;