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It finished in about 2 minutes for me, so you probably have a rendering issue. I'm on Chrome stable for Mac...

It depends on whether a the algorithm can generate a sufficiently large path (the white line) at first, since further development requires the purple path intersect that fixed path.

Finally finished. Question: I see I can inspect the canvas element and even edit the code. How do I run it with my edits (without pushing it to a server?)

The way bl.ocks.org works is pretty cool. Here's what you should do:

1) Go to the Gist that this bl.ock refers to: https://gist.github.com/mbostock/11357811

2) Fork that Gist and make your changes.

3) Go to bl.ocks.org/niels_olson/11357811 to see the finished product.

bl.ocks just displays whatever Gists you have up on GitHub, so you don't have to make an account or anything.

Thanks for the easy-to-follow instructions. I could quickly come up with an updated, less-likely-to-bore version ( http://bl.ocks.org/mdengler/a36fac5f10098bb94846 ), and included a version of your instructions and link to your comment.

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