Density charts built in Flutter with the help of Python.
The following article should help you get a good understanding on how the density chart painters can be used. The code used in the article can be found in the example project.
A Python Flask server was used to generate the KDE/contour data from raw data. While this is required to get the example contour chart rendered, the flutter_density_chart library works independently of the back-end. Pre-generated KDE/contour data can be directly passed into the chart painters.