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Brushing Circles with D3-Brush

✓ Published1🌍 Public

Last edited Feb 29, 2024

Created on Feb 28, 2024

This example demonstrates interactive brushing on a scatterplot of six circles, where dragging a rectangular selection highlights overlapping data points. It shows how a brush can filter or emphasize specific marks in a visualization. The implementation uses D3’s `brush` module, with a `brush` event listener that checks each circle’s coordinates against the selection bounds to update a `highlightedSet` in the state. Circle styling (stroke, opacity) responds to the highlighted set, and the `end` event clears highlights when the brush is dismissed. The rendering uses SVG elements via D3’s `select` and `join` pattern.

AI-generated description

A demonstration of how to implement brushing to select circles using d3-brush.

Challenge

Apply this technique to one of your visualizations, such as a scatter plot, to highlight certain data points

MIT Licensed

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