Example related to Canvas and CAD-Systems

[MarioBlunk]

Hello,

this posting is not about an issue but a recommendation to complete and improve the code examples in terms of "Canvas". I've put together a demo program that demonstrates how to set up a canvas for CAD-systems. Perhaps the maintainers of gtkada can make use of the code. Please find it at:

https://github.com/Blunk-electronic/ada_training/tree/master/src/gtk/canvas

Thanks for your work,

Mario Blunk