You could use GDI+ directly. Or the Cairo library. There are several bindings for Nim.
NiGui wraps both GDI+ and Cairo. Example program: [https://github.com/trustable-code/NiGui/blob/master/examples/example_10_drawing.nim](https://github.com/trustable-code/NiGui/blob/master/examples/example_10_drawing.nim)
