|OK, I will open myself for ridicule...
I WIIL (eventually) display real calculated data on Smith chart.
Smith chart - Wikipedia[^]
I can handle the math, what I see as a small issue is the actual GUI implementation.
I have few MAJOR choices - OpenGL, GTK and Cairo.
I found very promising code written for GTK and apparently using Cairo too.
(Cairo being 2D graph tool is my initial take on it).
I am not so sure about basic "window / form /view " - I see OpenGL as the simplest.
( I wish the "industry" woudl come up with uniform desorption / definition of the thing which was called when I started "coding" "window" - no capital W !
The advise I am seeking is
Are there other , simple, 2D graphic tools ?
I do not need spinning cube , shading, license plate recognition etc,