Dear Kas,
I am sorry, i think i am completely in loss and misunderstood the question, as thought the problem in drawing arcs in
GDI Yes you are right, the first post was based on
GDI+ and your Answers where absolutely good for this Question.
But in the meantime i have realisized that i have to change over to Real-3D to have the functionality in future Steps.
However, your answers were completely correct and I am very grateful for your help.
But I think my own requirements, or my new thoughts for the future display with Z-coordinates, require real 3D.