d3multichord
d3chord
to enable another dimension of data to be shown between nodes.
This is a modification of Circular layout for visualizing relationships or network flows with multiple types.
Installing
If you use NPM, npm install d3multichord
. Otherwise, download the latest release.
API Reference
This module is an adaptation of d3chord. Only the changes relevant to the multichord version are included here.
Constructs a new multichord layout with the default settings.
Computes the chord layout for the specified threedimensional matrix of shape n×n×m, where the matrix represents the directed flow amongst a network (a complete digraph) of n nodes, and links between nodes are classified into m categories. The given matrix must be an array of length n, where each element matrix[i] is an array of n numbers, where each matrix[i][j] represents the flow from the ith node in the network to the jth node, and each element matrix[i][j][k] is a an array of length m that represents the value of the flow from each of m categories. Each number within matrix[i][j][k] must be nonnegative, though it can be zero if there is no flow from node i to node j for that category.
Sample data from the US Census Migration Data by Nativity Example:
var matrix = [
[[0,0,0],[49,0,6],[236,1,18],[135,11,6]],
[[37,1,9],[0,0,0],[230,9,19],[94,3,0]],
[[295,6,24],[282,8,25],[0,0,0],[323,18,29]],
[[181,5,16],[107,13,13],[195,6,26],[0,0,0]]
];
The chords array also defines a secondary array of length n, chords.groups, where each group represents the combined inflow and outflow for node i, corresponding to the sum of the elements in matrix[i][0 … n  1][0 … m  1], and is an object with the following properties:

startAngle
 the start angle in radians 
endAngle
 the end angle in radians 
value
in
: the total incoming flow value for node i;out
: the total outgoing flow value for node i 
index
 the node index i