Color and Size Legends

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Color and Size Legends

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Last edited Feb 12, 2020

Created on Feb 12, 2020

This example demonstrates how to create custom legends for both ordinal color scales and quantitative size scales in D3 v5. The color legend displays four fruit categories with distinct colored circles, while the size legend uses a sqrt scale to show proportional circle radii for numeric tick values. The code exports reusable legend functions that use D3’s selection joins, `scaleOrdinal`, `scaleSqrt`, and generated SVG groups with circles and text labels.

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