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enter update exit

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AAshwani Sajwan
Last edited Apr 23, 2024
Created on Apr 23, 2024

Fifteen circles undulate in a continuous, animated sine-wave pattern across the screen, their vertical positions and radii oscillating as time advances. The code uses D3's `selectAll`, `data`, and `join` to manage enter, update, and exit states for each circle, while a `setInterval` loop updates the dataset every 50 milliseconds. All rendering is done via SVG elements appended to the body, with dynamic attributes for `cx`, `cy`, and `r` computed from trigonometric functions. The example demonstrates a simple, non-interactive harmonic motion visualization driven entirely by D3's data join and timed updates.

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