I need to determine the height of a string (in given scale and font) in postscript.
/Helvetic-Oblique findfont
10 scalefont
setfont
10 10 1 0 360 arc fill
10 10 moveto (test) dup stringwidth pop 2 div neg 0 rmoveto show
will print test centered horizontally (but not yet vertically) at (10,10). (to see this, I also show a small circle at 10,10). I also need to determine the string height to center the text vertically as well, but I cant find a function for it.