Path: utzoo!utgpu!water!watmath!clyde!bellcore!rutgers!cmcl2!nrl-cmf!ames!pasteur!ucbvax!decwrl!adobe!ondine!greid
From: greid@ondine.COM (Glenn Reid)
Newsgroups: comp.lang.postscript
Subject: Re: Display PostScript
Message-ID: <4053@adobe.COM>
Date: 29 Jun 88 22:56:37 GMT
References: <336@uva.UUCP> <1089@ssc-bee.ssc-vax.UUCP> <511@sequent.cs.qmc.ac.uk> <2484@amiga.UUCP> <518@sequent.cs.qmc.ac.uk>
Sender: news@adobe.COM
Reply-To: greid@ondine.UUCP (Glenn Reid)
Organization: Adobe Systems Incorporated, Mountain View
Lines: 56


>Not according to the stuff I received. How about
>
>        erasepage
>        0 1.5 translate
>        do_it_all_again
>
>Come on Adobe - you people read this board: is there any value
>in having the PostScript OUTPUT model in an interactive
>environment where the intermediate screen displays are of much
>more value that the final result?
	Yes.  The fact that it will be INTEGRATED into a windowing
	environment addresses that.  For example, take the Macintosh.
	There is the Font Manager and there is the Window Manager.
	The font manager gets bits written to the screen that
	represent text characters, and the Window Manager deals
	with scrolling the windows, overlapping, etc.  The application
	uses both:  if the window system tells it that it needs to
	redraw something, it will do that.  If the application
	wants to scroll, it can do that without redrawing the bits
	from the original "source".
	
	We're not breaking any new ground; that is a lot of the point
	of working within existing windowing systems.  These problems
	have been solved.  We're helping with writing the bits in
	a device-independent way, which is the hard part.
	
>					How do you scroll a text
>screen? How do you find out if the cursor is pointing at the
>object you have just drawn?
	How do you do this in X windows?  Same problem, same
	solution, except as regards the object you have just
	drawn.  That is where the integration of the window
	system with the Display PostScript system will help,
	in coordinating a mouse event with the object-oriented
	nature of your drawing.  I can't be any more specific
	just yet.

>				If you are going to be high and
>mighty about Sun NeWS, perhaps you have answers to the problems
>it is trying to address.
	We're not trying to address them, that is part of the point.
	We will just coordinate nicely with whatever solution
	is appropriate in a given environment.

	And I do want to emphasize that we are not trying to
	be high and mighty about NeWS or anything else.  We
	are just developing technology.  It's perfectly feasible
	to use Display PosTScript within the windowing environment
	provided by NeWS.
	
	There is an awful lot of speculation about all this;
	I'd like to help shed as much actual light as possible.
	
Glenn Reid
Adobe Systems