Fork of Color and Size Legends

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Fork of Color and Size Legends

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Last edited May 4, 2021

Created on May 4, 2021

This example demonstrates reusable legend components for both ordinal color scales and quantitative size scales. The color legend renders colored circles with labels for fruit categories, while the size legend displays circles scaled by magnitude using a square-root scale. Both legends are implemented as custom D3 functions that bind data to SVG groups, using `selection.enter()` and `selection.merge()` for updates. The code utilizes `d3.scaleOrdinal`, `d3.scaleSqrt`, and `scale.ticks()` to generate tick values for the size legend.

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Fork of Color and Size Legends

This example demonstrates reusable legend components for both ordinal color scales and quantitative size scales, rendered as SVG. The color legend uses `d3.scaleOrdinal` to map fruit categories to colors, while the size legend uses `d3.scaleSqrt` to map numeric tick values to circle radii. Both legends are drawn using custom selection-based functions that append SVG groups, circles, and text elements with d3’s selection API. The code runs in d3 v5 and renders within a single SVG element.

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This example demonstrates reusable D3.js legend components for ordinal color scales and sequential size scales. The color legend displays four fruit categories (apple, lemon, lime, orange) as colored circles, while the size legend visualizes numeric ticks from 0 to 10 as scaled circles. Both legends use D3 v5’s `scaleOrdinal` and `scaleSqrt`, with custom legend modules handling circle positioning and text offsets. The SVG rendering includes styled ticks and text, with circles given black stroke outlines for visual separation.

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This fork demonstrates reusable D3 legend components for both ordinal color scales and sequential size scales. Two separate legend modules render circles and labels in SVG, with colorScale mapping fruit names to colors and sizeScale using d3.scaleSqrt for proportional areas. The color legend displays four categorical items, while the size legend applies d3.ticks to generate five numeric breaks. Both components use enter/merge/exit selections to update groups dynamically.

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