{"version":"1.0","type":"rich","title":"mouse follower","description":"This example shows a single green circle that follows the mouse pointer across an SVG canvas. Moving the mouse updates the circle’s position via `d3.pointer` and state management, while clicking changes its fill color to a random hex value. The code uses D3 v7, with `select`, `pointer`, and data joins to bind the circle’s coordinates and radius. The visualization demonstrates reactive updates through a `setState` callback, with the circle rendered at half opacity.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"","width":960,"height":500,"cache_age":3600}