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Point-Along-Path Interpolation

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Mmbostock
Last edited Feb 9, 2016
Created on Oct 25, 2011

A small circle animates repeatedly along a fixed arc path, demonstrating how to interpolate a point’s position along an existing SVG path. The example uses D3 v3 and SVG’s native `getTotalLength` and `getPointAtLength` methods to compute the circle’s coordinates at each step. A `transition.attrTween` drives the animation, updating the circle’s `transform` attribute over five seconds, then restarting it via the transition’s `each("end")` event. The path itself is drawn with `d3.svg.arc` and rendered as a gray filled shape with a pointer cursor.

AI-generated description

Demonstrates how to use the getTotalLength and getPointAtLength methods on SVG path elements to interpolate a point along an existing path. Built with D3.

gpl-3.0 Licensed

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