I’ve thought about doing this for a while. Build a small toolkit (a library) of helper routines for any program that uses the SDL2 library. That means it will have functions to do the following:

1. Draw horizontal and vertical lines in a specified colour.
2. Draw coloured rectangles both filled in and empty.
3. Draw Circles of specified radius and colour.
4. Draw hexagons in either orientation and of a specified size, hollow or filled.

Plus any other things that occur to me. I’ll start on this shortly.