Pause and Resume in d3 js

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Javascript

animation

Hi, I'm using d3.js. I have successfully animate graph like this: mike bostocks's nations[^] using my own data. I want to add pause and resume button, so I can pause and continue the animation. I've read this explanation: http://xaedes.de/dev/transitions/[^] for pausing and resuming the transition(animation), but I didn't get the idea, because(the animation preview(s) doesn't show up). Anyone have other sample(s) for pause and resume using d3 js?