[Maxima] Arbitrary direction of y-axes in a multiplot

[Stefano Ferri]

Hi, I need to plot some functions in a multiplot, and I need to set arbitrary 
directions of y-axes (and of x-axes and origins coordinates as well). Is it 
possible with Maxima?
My purpose is to plot stress diagrams on lines representing a real structure 
(it's for students in Civil Engineering). These lines will become x-axes.

Thanks
Stefano