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Color and Size Legends

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Pprincit
Last edited Mar 30, 2020
Created on Mar 28, 2020

This example demonstrates how color legends and size legends are constructed using D3 v5’s ordinal and square-root scales. A colorLegend component renders colored circles for fruit categories, while a sizeLegend maps numeric tick values to circle radii. Both legends are built with data-bound SVG groups, using `selection.enter()` and `selection.merge()` for updates, and `scaleOrdinal` and `scaleSqrt` for encoding. The code also employs `sizeScale.ticks()` to generate evenly spaced legend entries, with text labels offset from each circle.

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