imaNNeo/fl_chart ? reverse-engineered prompt

Build me a Flutter chart library that makes it easy to show clean, customizable charts in an app.

I want support for line charts, bar charts, pie charts, scatter charts, radar charts, and candlestick charts, with nice animations and plenty of styling options so the charts can match different app themes. Please include a simple demo app with example screens for each chart type, so I can see how to use it and swap in my own data. The charts should be smooth, responsive, and easy to configure without a lot of boilerplate.

Make sure the code is organized so it’s easy to reuse, and include basic tests if that fits naturally. If you need to check the latest Flutter guidance or chart rendering details, look up the current docs online.