Since you can write more or less, arbitrary "tween" functions in D3 (I learnt more than I wanted to about these when I wrote the dynamic "semaphore pie" we used

Since you can write more or less, arbitrary "tween" functions in D3 (I learnt more than I wanted to about these when I wrote the dynamic "semaphore pie" we used here [1] ) it's relatively viable to do it for paths created from within D3. For paths already present and wanting to be selected... I guess it would work pretty much the same, since d3 selectors are more or less good to go with embedded SVGs, IIRC. It's actually a very nice trick (and I love moving things around in graphs), and I'm intrigued by how I'd do it with D3. If I have any free time this weekend I'll look into it ;) [1] VanillaSEO: http://vanillaseo.com/report/20141030fdec7fda61eafac3b8dca58899defb9e http://vanillaseo.com/report/20141030fdec7fda61eafac3b8dca58... Ninja edit (or almost): Here's the relevant part of d3 docs about tweens: https://github.com/mbostock/d3/wiki/Transitions https://github.com/mbostock/d3/wiki/Transitions