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Fork of Circles with D3

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MMatt Hagger
Last edited Aug 26, 2025
Created on Aug 26, 2025
Forked from Circles with D3

This example renders a generative spiral of 500 semi-transparent circles that grow and shift in a golden-hued gradient across a pale green canvas. The visualization uses D3 v7’s `select` API and the `.join()` operator to declaratively create and update an SVG, computing each circle’s `cx`, `cy`, `r`, and `fill` from sine and cosine functions of its index. The code demonstrates D3’s modern “join” pattern for idempotent state management, with the container’s dimensions driving the spiral’s center and radius.

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