{"version":"1.0","type":"rich","title":"Circle Trail","description":"A white circle follows the mouse cursor across a purple background, leaving a trail of its previous positions. The visualization uses d3-selection’s `select` and `selectAll` with a `.join()` pattern to append or update a single circle element on each `mousemove` event. The circle’s coordinates are stored in a state object and updated via a `setState` callback, while `window.innerWidth` and `window.innerHeight` set the SVG size. This demonstrates a simple, event-driven rendering loop with D3 v7.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/b32468347a6241118e3b02c5dca810b0?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}