Stroke Dash Interpolation

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Stroke Dash Interpolation

✓ Published0🌍 Public

Last edited Feb 9, 2016

Created on May 25, 2013

A closed path, rendered as a dark stroke using a cardinal-closed line generator, loops through seven points on an SVG canvas. A dashed gray duplicate of the same path overlays it, while the dark stroke animates its `stroke-dasharray` from a zero-length dash to the full path length and back, creating a continuous drawing effect. The animation uses `transition.attrTween` with `d3.interpolateString` and `getTotalLength()` to compute the path length, cycling indefinitely via the transition’s `end` event. The example relies on D3 v3’s `d3.svg.line` and SVG path elements.

AI-generated description

By interpolating the stroke-dasharray style property, you can animate a stroke from start to end. This might be used to convey directionality of connected links in a network graphic, such as our graphic of Academy Award nominees. By setting the transition duration proportional to the length of the line and using linear easing, you can further animate the stroke at constant speed.

A related technique is point-along-path interpolation.

gpl-3.0 Licensed

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