A simple graphics rectangle? My coordinates are wrong

[Arno K]

Hello Stephen,
the problem must be computation of data in BORDERU, if BWIDTH is 0 then BORDERU(4) is -1, I don't know why this works at all.
But after I tried without these -1 parts the Programm still draws a line. So the conclusion is that rect_p cannot draw rectangles of size 0.
Arno