Element rotation with point-along-path interpolation

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Element rotation with point-along-path interpolation

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Last edited Sep 3, 2018

Created on May 22, 2017

A small triangle and a text label move along a dashed path, with the triangle’s rotation updating to match the tangent of the curve at each point. The label displays the computed angle in degrees as the element travels back and forth. Built with D3.v3, it uses `d3.svg.line` for the path, `transition.attrTween` with `translateAlong` for motion, and `getPointAtLength` plus `Math.atan2` to derive orientation. The underlying data is random values mapped through a linear scale.

AI-generated description

This example uses point-along-path interpolation, but also changes the rotation of the moving element depending on its place on the path.

forked from <a href='http://bl.ocks.org/bycoffe/'>bycoffe</a>'s block: <a href='http://bl.ocks.org/bycoffe/c3849a0b15234d7e32fc'>Element rotation with point-along-path interpolation</a>

mit Licensed

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