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fl_chart is a charting library for Flutter that focuses on expressive, highly customizable data visualizations with smooth animations. It offers a broad set of chart types—line, bar, pie, scatter, and radar—each exposed through clear data/option models rather than imperative drawing. Interactive features like touch handling, tooltips, selection/highlighting, and panning help apps present insights rather than static images. The package pays special attention to aesthetics, with options for gradients, curved lines, stacked bars, rounded corners, custom tick formats, and flexible legends. ...

...The library includes a core package, charts_common, which defines the shared logic and rendering capabilities, and charts_flutter, a Flutter-specific implementation that enables seamless integration with mobile apps. Developers can use Charts to display various chart types such as bar charts, line charts, pie charts, and more, with options to customize colors, labels, and animations. Although the project is no longer actively maintained, it remains a useful reference and foundation for developers interested in charting solutions within the Flutter ecosystem. Its modular design and open source nature allow the community to extend and adapt it for modern needs, ensuring continued usability through community-maintained forks.