What library for displaying graphs in c++ should I use?

Question

Qt

In a C++ application (Qt, to be precise), you need to make the graphs display in 2D, and, if possible, in 3D. Oscillogram type graphs, real-time signal display. What library to use? While I found Matplotlib, it's good for everyone, but it's only for Python, as I understand it.
Main wishes: open-source, high-speed display of dynamically changing data in real time, cross-platform.

Answer 1

qcustomplot

Answer 2

qwt.sourceforge.net

Answer 3

https://www.google.ru/search?q=qt+plot