2019 Arc Tween
A circular gauge displays a background arc and an orange foreground arc representing a value, which updates to a new random angle every few seconds. The animation uses a custom `transition.attrTween` on the `d` attribute, interpolating the endAngle in data space via `d3.interpolate`. The arc path is computed with `d3.arc`, and the transition duration is set to 100,000 milliseconds, creating a smooth, continuous rotation.
AI-generated descriptionA commented example of tweening arcs; see Pie Chart Update, II and Arc Tween (Clock) for older examples. (There’s also The Amazing Pie and Donut Transitions if you want to get fancy.) See the API reference for transition.attrTween and my tutorial Working with Transitions for more.
forked from <a href='http://bl.ocks.org/mbostock/'>mbostock</a>'s block: <a href='http://bl.ocks.org/mbostock/5100636'>Arc Tween</a>
forked from <a href='http://bl.ocks.org/easadler/'>easadler</a>'s block: <a href='http://bl.ocks.org/easadler/00dac1ac396fa747097be4ad22da2615'>Arc Tween</a>