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Color and Size Legends

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Jjlongwellchc
Last edited Sep 23, 2019
Created on Sep 18, 2019

This example shows two custom legends for visualizing categorical and quantitative data: a color legend mapping fruit names to distinct colors, and a size legend mapping numeric values to circle radii using d3.scaleOrdinal and d3.scaleSqrt. The legends are rendered as SVG groups with circles and text labels, positioned via transform attributes. The code uses d3-selection’s enter/merge/exit pattern to bind data and update elements, with custom functions colorLegend and sizeLegend defining the layout and spacing.

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