Gist 7800813

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Last edited Dec 5, 2013

Created on Dec 5, 2013

This example demonstrates how to trigger a custom event partway through a D3.js transition. It shows a single SVG rectangle falling vertically from above the viewport to a fixed position, while a message is appended to the page halfway through the animation. The code uses `transition.attrTween` with `d3.interpolate` to animate the rectangle’s `y` attribute over three seconds, and a callback checks the normalized time parameter `t` to fire the halfway event once. The visualization uses a simple ordinal scale for positioning and is rendered as SVG with D3 v3.

AI-generated description

Fire event during a transition

https://github.com/mbostock/d3/wiki/Transitions#wiki-attrTween

https://github.com/mbostock/d3/wiki/Transitions#interpolation

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