Forked from upphiminn's block: Example of d3-ForceEdgeBundling on US airline routes graph and updated for d3 v4.
See this map which uses similar techniques https://www.nytimes.com/interactive/2015/11/12/us/gun-traffickers-smuggling-state-gun-laws.html
TODO: move to a Javascript worker.
forked from Fil's block: Example of d3-ForceEdgeBundling on US airline routes graph.
https://d3js.org/d3.v4.min.js