How to build a two-dimensional graph with three axes using C++, QT?

Question

Qt

It is necessary to build a flat two-dimensional graph on which vectors (these are like arrows) with three coordinates will be displayed. Those. as a projection of a three-dimensional graph onto a plane.
Obviously, you can use qtcustomplot, but I did not google the possibility to use the third axis. From what side then to approach the problem?

Answer 1

It is logical that a two-dimensional graph cannot draw three-dimensional vectors. Take and do the projection yourself and drive it into qtcustomplot.
You need projections of your vector onto the unit vectors oX (1, ​​0, 0) and oY (1, 0, 0); then add the projections on oX and oY - this will be the projection of the vector on the "graphics" plane. (well, unless you have to throw out the coordinates along the Z axis from the vector, it should turn out to be equal to zero anyway)
Google how to build the projection of a vector onto a vector.
ps
Well, of course, the plane from my example above is one of countless. You can use any bases if needed.