Re: General bug - No out of bounds checking on 3D coordinates

[Ethan M. <merritt@u.washington.edu>]

On Monday 05 July 2004 02:14 pm, you wrote:
> Ethan Merritt wrote:
> >Is everyone OK with the idea "if a label is out of bounds don't
> >try to draw it at all"?
>
> Not totally.  It would be nice that if a partial text string were
> supposed to show it would.  

That happens now for some drivers, but only for labels whose
coordinates are out of bounds but still positive.  If they go negative
then nothing good can happen.

> I would say that if you pin this down as the 
> actual problem and it seems that there is no easy solution, then OK.

Huh?  I know exactly what the problem is.  By the time the coordinates
for the label are passed to libpdf they have already been mangled by
converting them to (unsigned int).

If you want to allow the general case of labels that start off-screen
but extend into view then we would (I think) have to change all the
coordinates passed to terminal drivers from unsigned to signed.

That would be mean changing many lines of code, but other than that
I don't see any intrinsic problem with it.  Of course, only a subset
of drivers could actually do anything useful with the negative numbers.