{"version":"1.0","type":"rich","title":"pie chart","description":"This interactive pie chart displays the distribution of electric-vehicle charging stations across cities, with a dropdown menu to switch between metrics: charging ports, daily users, monthly energy, and average charge time. Built with D3 v7, it loads data from a text file, aggregates values by city using `d3.rollup`, and renders SVG slices with `d3.arc`. Hovering reveals a tooltip with percentages, while labels show city names and shares. Animated transitions update the chart when the metric changes.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/85022f64104e4957af4a347f8bf6abef?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}