BiDirectional Hierarchical Sankey Diagram

This is a d3 javascript plugin/library for generating bidirectional hierarchial sankey diagrams

The sourcecode is almost entirely forked from @Neilos's work. Kudos to him ! I've mostly created a npm wrapper and added a depth property to the nodes along with some basic typings

### Live Code Demonstration

For a a full demonstration of the use of this library: http://bl.ocks.org/duhaime/3865371eea1bd32b36f53e63dabb6b72

Overview

To Set the diagram properties:

biHiSankey
  .nodeWidth(30) // sets the pixel width of all nodes (heights are variable, widths are fixed)
  .nodeSpacing(10) // sets the minimum vertical pixel spacing between nodes
  .linkSpacing(4) // sets the vertical pixel spacing between links
  .arrowheadScaleFactor(0.5) // Specifies the proportion of a link's stroke width that should be allowed for the marker at the end of the link e.g. an arrow
  .size([someWidth, someHeight]); // sets the width and height of the diagram in pixels

To (re)initialize the sankey diagram with data

var someNodes = [
  {"type": "A", "id": 1, "parent": null, "name": "Node 1", Xdepth: 0, Ydepth: 1},
  {"type": "A", "id": 2, "parent": "1", "name": "Node 2"},
  {"type": "A", "id": 3, "parent": "1", "name": "Node 3"},
  {"type": "B", "id": 4, "parent": null, "name": "Node 4", Xdepth: 1, Ydepth: 3},
  {"type": "B", "id": 5, "parent": "4", "name": "Node 5"},
  {"type": "C", "id": 6, "parent": "5", "name": "Node 6"},
]
var someLinks = [
  {source: 3, target: 2, value: 20},
  {source: 2, target: 3, value: 90},
  {source: 3, target: 6, value: 40},
  {source: 6, target: 2, value: 70},
  {source: 6, target: 3, value: 10},
]

biHiSankey
  .nodes(someNodes) // pass in the nodes
  .links(someLinks) // pass in the nodes
  .initializeNodes(function (node) {
    // amend or add properties to each node as required
    // ...
  })

If two nodes (n1, n2) have different Xdepths: n1.Xdepth < n2.Xdepth then the node n1 will be placed to the left of n2 If two nodes (n1, n2) have different Ydepths: n1.Ydepth < n2.Ydepth then the node n1 will be placed on top of n2

To (re)calculate the attributes of all nodes and links:

biHiSankey.layout(20); // pass in a maximum number of iterations

To (re)calculate link paths and node heights but do not change the node positions:

biHiSankey.relayout();

To return any of the previously set properties:

biHiSankey.links();
biHiSankey.visibleLinks();
biHiSankey.linkSpacing();
biHiSankey.nodes();
biHiSankey.nodeWidth();
biHiSankey.nodeSpacing();
biHiSankey.size();

License

BiHiSankey is released under the MIT License.