Re: OPENSTEP->GNUstep Porting Questions

[Richard Frith-Macdonald]

On Friday, December 7, 2001, at 05:52 AM, Jay McCarthy wrote:

> Ya I'm the jerk who replies to himself.
>
> On Thu, 2001-12-06 at 21:37, Jay McCarthy wrote:
> > 2) Some of these programs are trying to use the class NSDPSContext,
> > which is defined in the 'Display Postscript' section of the OPENSTEP
> > spec. In the gnustep-gui reference documentation it claims that this
> > class is defined in 'Gui/NSDPSContext.h'. There is no NSDPSContext.h in
> > System/Headers - anywhere (as far as I can find). Would this imply that
> > that class must be implemented still?
> >  I realize that in gnustep/dgs/dgs/DPS there is a DPSContext
> > (class|struct?), but I don't know if that is what I need (nor can I 
> > find
> > the proper header which defines it)
>
> Sorry about this question, I'm an idiot I figured it out. The code was
> acutally checking for a certain version of OPENSTEP - namely if RHAPSODY
> had been defined, and if that was the case it was using a
> NSGraphicsContext ( which is something that GNUstep has.)
> However, even if that part of the problem was solved - the documentation
> for gnustep-gui is still wrong in saying that a NSDPSContext class (and
> companion NSDPSContext.h ) exists.

NSDPSContext.h *does* exist.

NSDPSContext is a subclass of NSGraphicsContext which handles display 
postscript
stuff - it exists in the xdps backend library.

If you are using the xgps backend, you don't have a true display 
postscript
system, and you can't used the NSDPSContext specific stuff - it's 
therefore
better to port your code to work with NSGraphicsContext and use the 
NSBezierPath
class for drawing unless you know you are only going to be working with 
the
xdps backend.