fjensen@sbstark.cs.sunysb.edu (Frank Jensen) (06/11/90)
I have just tried to use the `bb.ps' code. It is supposed to
keep track of bounding box information while it draws the figure.
This sounds to be difficult in general: it is hard to keep track of
something being drawn and then - maybe partially - erased later. So,
sometimes you will get a bounding box that is too large.
But I didn't expect to get a too small bounding box!
I then looked at the code, and I found that the code (a least the
version I have) do not save changes made to the bounding box between
save/restore pairs. I therefore added the following lines to the code:
/-restore /restore load def
/restore
{ bb-llx bb-lly bb-urx bb-ury
5 -1 roll
-restore
/bb-ury xstore /bb-urx xstore
/bb-lly xstore /bb-llx xstore
} def
This code ensures that the bounding box information is preserved when
VM is restored to a previous snapshot.
Frank Jensen
Department of Computer Science
State University of New York at Stony Brook