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animate line with arrow

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RRainboylvx
Last edited Jun 4, 2018
Created on Jun 4, 2018

An animated line with an arrowhead traces a polyline through three points, with a red circle marking the arrow’s starting position. The example uses D3 v4’s `d3.select` and `d3.append` to build an SVG, defines a custom marker via `svg:defs` and `marker`, and computes path geometry with the DOM `getTotalLength()` and `getPointAtLength()` methods to position the circle at the line’s origin. The arrow’s orientation is set to “auto” so it follows the path’s direction.

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