C++ GUI

Question

If you know about processing (p5.js), as you already know it lets you create lines, shapes whatever. I want to do this in c++. However I couldn't find the right way to do that.
Those gui libraries (qt, gtk etc.) seemed too complicated to me and I couldn't find anything that I want (creating lines shapes... maybe there is I don't know.)
Is there a way to create a window and manipulate its pixels? so I can write my own functions to display lines, shapes.
If not, how can I code my own library to achieve this? Or is it possible to do so?

Answer 1

Sfml