Plotting math functions (quadratic functions) in C++11 on Ubuntu using ImGui

I'm trying to plot a math function (specifically a quadratic function) using ImGUI, and was wondering where I should start from?

I'm trying to achieve something like this: https://www.youtube.com/watch?v=F8KpvjdZTMc

I'm using SFML to render the window and the GUI tools from ImGUI.