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Canvas Animation Using D3.js

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11Cr18Ni9
Last edited Nov 5, 2019
Created on Nov 5, 2019

This example demonstrates how to apply D3.js’s enter-update-exit pattern and transitions to custom DOM elements, then render their positions and radii onto an HTML5 canvas. A dat.GUI control regenerates randomized circle data, triggering smooth positional and size animations on custom `<c>` nodes. A `MutationObserver` watches attribute changes on a custom element container and redraws the canvas whenever those animated attributes update, bridging the gap between D3’s DOM-centric data joins and canvas-based rendering. The code uses `d3.select`, `transition.attr`, and the Canvas 2D `arc` API.

AI-generated description

Inspired by:

In this example:

  • I create customed node to adopt d3's enter-update-exit pattern and animation feature.
  • Using MutationObserver to observer mutation on target node and its descendents.
mit Licensed

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