having spend a few days reading "the latex companion" and Leslie Lamport`s "LATEX Users Guide and Reference Manual" I have come to the conclusion that graphic creation with LATEX is a big pain.
Only practicable solution seems to be generation of graphical materials in another software package and then inserting them in latex.
I have spend quite a lot of time on that thing
But at least I learnt something that latex was thought to be type setting programs when there was not need for graphics back in the 70s.