color and size legends

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color and size legends

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Last edited Nov 3, 2022

Created on Nov 3, 2022

This example demonstrates reusable D3.js legend components for mapping ordinal color scales and continuous size scales. The color legend displays four fruit categories using `d3.scaleOrdinal`, while the size legend uses `d3.scaleSqrt` to visualize values from 0 to 10 with proportional circle radii. Both legends render as SVG groups with circles and text labels, using a data-join pattern for enter/update/exit transitions. The `colorLegend` and `sizeLegend` functions illustrate how to build modular, configurable legend components for scatterplots or choropleth maps.

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