Re: NSScroller, NSBrowser and some issues

[Adam Fedor]

Pascal Bourguignon wrote:
> > From: Nicola Pero <nicola@brainstorm.co.uk>
> > Date: Fri, 11 Oct 2002 15:07:33 +0100 (BST)
> >
> >
> >
> > > > > > I think we should stick to policy of having a NeXTstep look ... and use
> > > > > > NSInterfaceStyle where people want alternatives.  So a patch to support
> > > > > > an interface style which gives a stippled scroller background ought
> > > > > > to be admissable IMO.
> > > > >
> > > > > The NeXTstep look _is_ stippled. :)
> > > >
> > > > I'll take your word for it ... I no longer have a NeXTstep system
> > > > since the
> > > > hardware I used for it died.  It didn't *look* stippled to me as far
> > > > as I can
> > > > remember, but I had a lower quality display back then and it could
> > > > just have
> > > > looked like a solid grey because of that.
> > >
> > >  It is definitly stippled. If magnify screenshot of the scrollbar(as
> > >  well as NSSlider) you'll see that.
> >
> > I think Adam was right in holding the patch until the issue was clear ...
> > but yes, looking at screenshots on the web, it seems that NeXTstep did
> > indeed used a stippled background for scrollers, so I'd say we want the
> > same by default :-)
>
>
> I'm not so sure.  For all I know, it could as well have been:
>
>     0.5 setgray
>     0 0  moveto 0 200 rlineto 16 0 rlineto 0 -200 rlineto closepath fill
>
> It just  happen that on a  2bit depth screen,  the best way to  do 0.5
> gray is to mix dark ).33) gray and light (0.66) gray pixels.
>
>
> The definitive  answer to that  question would be  to look at  a color
> display that I don't have.

I booted up my color NeXT and found out it was stippled also. The 
interesting thing is that NeXT does this using the setpattern PostScript 
operator (which basically tells the DPS engine how to draw a color.). 
That's much more complicated than our PostScript "engine" works. The 
closest equivalent I could think of is drawing an image, like Nicola 
suggested...



--
Adam Fedor, Digital Optics Corp.      | I'm glad I hate spinach, because
http://www.doc.com                    | if I didn't, I'd eat it, and you
                                      | know how I hate the stuff.