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Color and Size Legends

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HHe Jianfeng
Last edited Apr 11, 2021
Created on Apr 11, 2021

This example demonstrates two types of legends: a color legend for ordinal categories (apple, lemon, lime, orange) and a size legend for a square-root scale mapping values 0–10 to circle radii. Both legends use SVG groups with tick marks, rendered via D3 v6’s `scaleOrdinal` and `scaleSqrt`, and are constructed through reusable functions that append circles and labels with dynamic positioning. The color legend assigns categorical colors, while the size legend computes tick values using `sizeScale.ticks`, filters out zero, and reverses the order. Styling is applied through CSS classes for text and circle strokes.

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