How to print graphs in reports?

A friend of mine wants to know how he might be able to print real graphs in 4GL (or maybe ACE) reports. That is, his database is full of numerical engineering data, and he'd like to be able to plot graphs in his reports to display those data. Is there any way to do this? Obviously one can plot "ascii graphs" like this... xxxx xxxxx xxxxxxxxxx xxxxxxx xxxx xxxx xxx but I am pretty sure that he needs better resolution than this. Is it feasible to have the report output be a postscript file? I imagine this would mean figuring out all the control characters/commands in postscript and having the report print them all out. I feel that many many people must have needed to do things like this in the past, and I wonder how they did it? Thanks in advance for any hints ... Paul