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Point-Along-Path Interpolation

✓ Published0🌍 Public
Aantonyross
Last edited Apr 19, 2016
Created on Apr 19, 2016

Two nested, closed Catmull–Rom splines define the paths in this SVG animation. Clicking anywhere adds a colored circle that first collapses to the inner path’s start, then follows the outer path via a tween that switches between the two paths partway through the animation. The code uses D3 v3’s `transition.attrTween` with the native SVG `getTotalLength` and `getPointAtLength` methods to interpolate each circle’s position, while a text element displays the tween progress as a percentage.

AI-generated description

This example demonstrates how to use the getTotalLength and getPointAtLength methods on SVG path elements to interpolate a point along a Catmull–Rom spline.

A related technique is stroke dash interpolation.

forked from <a href='http://bl.ocks.org/mbostock/'>mbostock</a>'s block: <a href='http://bl.ocks.org/mbostock/1705868'>Point-Along-Path Interpolation</a>

forked from <a href='http://bl.ocks.org/antonyross/'>antonyross</a>'s block: <a href='http://bl.ocks.org/antonyross/da1e1bdb53cd9df07b0d7848835f2b9f'>Point-Along-Path Interpolation</a>

forked from <a href='http://bl.ocks.org/antonyross/'>antonyross</a>'s block: <a href='http://bl.ocks.org/antonyross/79c75e46b93860f74a7c29f3a190a8ca'>Point-Along-Path Interpolation</a>

forked from <a href='http://bl.ocks.org/antonyross/'>antonyross</a>'s block: <a href='http://bl.ocks.org/antonyross/fbc32c4d940260be137180b55ae6f428'>Point-Along-Path Interpolation</a>

gpl-3.0 Licensed

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