Re: Option 'ai' in Postscript terminal

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

On Friday 13 August 2004 08:55 am, Harald Harders wrote:
> > But the code produced by the driver is *not* Level 1 PostScript,
> > even without the Pattern definitions.   Calling it Level 1 is just not
> > correct.
> 
> Mmmh, which are the Postscript level 2 commands used in Gnuplot?

I apologize for what may have been an unwarranted assumption.
You are right, and I was unduly accepting of the first line of the 
output file, which has been
   %!PS-Adobe-2.0
since at least gnuplot version 3.7

In a quick check of the source for Level 2 extensions listed in the
PostScript reference manual I don't see any obvious ones. I am not
sure about whether our code assumes Level 2 behaviour with 
regard to font encodings.

> Wasn't it 
> a good idea to make a pslevel option which really switches back to
> postscript level 1 syntax? Or does this involve too strong limitations?

It's a good idea.  I thought it would involve actual work, but I 
guess I was too pessimistic.   

However, Daniel's upcoming binary + image patch depends on the
Level2 operator "filter", so we will have to keep an eye on that.

So I am convinced.  I'll change the syntax again, and make the option
"level1".
 

-- 
Ethan A Merritt       merritt@u.washington.edu
Biomolecular Structure Center
Mailstop 357742
University of Washington, Seattle, WA 98195