If you ever wondered how to add a tool to the GeoTools swing map then I've written a short introduction to it. There is also a link to a small project that provides a tool to draw lines on a map.
See https://blog.ianturton.com/geotools/2023/05/08/drawing-on-a-geotools-map.html for all the gory details. cheers Ian -- Ian Turton
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