d3 point locator

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d3 point locator

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Last edited Feb 6, 2023

Created on Feb 6, 2023

This example demonstrates how to locate the y-coordinate of a point on a smoothed curve for a given x-value, using a bisection algorithm on the SVG path element. It generates a random walk dataset of 50 points, renders it as a smooth line using d3.line with the “curveBasis” interpolation, and then for each data point, finds the corresponding y-value on the rendered path by repeatedly sampling path.getPointAtLength. The code uses d3.select, d3.scaleLinear, and d3.line to create the visualization.

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A bare minimum HTML page demonstrating use of CSS and JavaScript.

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