One-Way Markers

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One-Way Markers

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Last edited Mar 8, 2018

Created on Mar 8, 2018

This example animates a one-way directional marker along a continuously changing curve, demonstrating how SVG marker-mid can create an arrow flow. The marker’s orientation automatically follows the path direction. The code uses d3.svg.line with basis interpolation, and the path is resampled using getPointAtLength to uniformly place markers. The animation is driven by d3.timer, updating a parametric function that morphs the curve over time. Both the base path and marker path are rendered as SVG elements, with the marker path using marker-mid to draw arrowheads.

AI-generated description

Inspired by Tom MacWright’s previous take on one-way line markers, this example adopts a technique from my path tween example: uniform sampling via getPointAtLength. A rendered line is resampled such that each control point is equally spaced along the length of the line. Thus, the desired number of markers are rendered.

forked from <a href='http://bl.ocks.org/mbostock/'>mbostock</a>'s block: <a href='http://bl.ocks.org/mbostock/4965670'>One-Way Markers</a>

gpl-3.0 Licensed

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