Drawing multiple edges between two nodes with d3

Question

I've been following Mike Bostock's code from this example to learn how to draw directed graphs in d3 and was wondering how I would structure the code so that I could add multiple edges between two nodes in the graph. For example, if the dataset in the example above were defined as

var links = [{source: "Microsoft", target: "Amazon", type: "licensing"},              {source: "Microsoft", target: "Amazon", type: "suit"},              {source: "Samsung", target: "Apple", type: "suit"},              {source: "Microsoft", target: "Amazon", type: "resolved"}]; 

and then run through the code, all I see is one line. All the paths are being drawn correctly in the html code, however they all have the same coordinates and orientation which causes the visual to look like 1 line. What kind of code restructuring would need to be done in this example to allow for the 3 edges to not be drawn on top of each other?

Answer 1

In fact, the original visualization is a prime example of one method to show multiple links between nodes, that is - using arcs rather than direct paths, so you can see both incoming and outgoing links.

This concept can be extended to show multiple of each of these types of links by changing the radius values of subsequent svg path(arc) elements representing the link. A basic example being

dr = 75/d.linknum; 

Where d.linknum represents the number of the successive link. dr is later used as the rx and ry amounts for the arc being drawn.

Full implementation here: http://jsfiddle.net/7HZcR/3/