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| From | Helge Blischke <h.blischke@acm.org> |
| Newsgroups | comp.lang.postscript |
| Subject | Re: What is the best way to work with a dictionary |
| Followup-To | comp.lang.postscript |
| Date | Sat, 13 Jul 2013 22:32:50 +0200 |
| Lines | 63 |
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Cecil Westerhof wrote:
> Until now I wrote functions like:
> /ellipse { % x y unitX unitY colour
> 5 dict begin
> /colour exch def
> /unitY exch def
> /unitX exch def
> /y exch def
> /x exch def
>
> gsave
> newpath
> colour setrgbcolor
> x y translate
> unitX unitY scale
> 1 1 1 0 360 arc closepath fill
> stroke
> grestore
> end
> } def
>
> I just saw in ‘PostScript Drawing: An Economist's Guide’ that it also
> should be possible to do it in the following way:
> /ellipse { % x y unitX unitY colour
> <<
> /colour exch
% operand stack at this point:
% x y unitX unitY color /color mark
> def
> /unitY exch def
> /unitX exch def
> /y exch def
> /x exch def
> >> begin
> gsave
> newpath
> colour setrgbcolor
> x y translate
> unitX unitY scale
> 1 1 1 0 360 arc closepath fill
> stroke
> grestore
> end
> } def
>
> Which of the two is the better one and why? I think I like the second
> one more.
> The only problem is that it does not work. I get:
> Error: /unmatchedmark in -->>--
>
> I am using:
> GPL Ghostscript 9.06
>
You see that the name /color gets associated with the object mark, i. e. the
--<<--, which is equivalent to --mark--, gets consumed and therefore is
missing at the time -->>-- is executed.
Think about it.
Helge
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What is the best way to work with a dictionary Cecil Westerhof <Cecil@decebal.nl> - 2013-07-13 22:13 +0200
Re: What is the best way to work with a dictionary Helge Blischke <h.blischke@acm.org> - 2013-07-13 22:32 +0200
Re: What is the best way to work with a dictionary Cecil Westerhof <Cecil@decebal.nl> - 2013-07-13 23:25 +0200
Re: What is the best way to work with a dictionary luser- -droog <mijoryx@yahoo.com> - 2013-07-13 17:04 -0700
Re: What is the best way to work with a dictionary Cecil Westerhof <Cecil@decebal.nl> - 2013-07-14 15:11 +0200
Re: What is the best way to work with a dictionary luser- -droog <mijoryx@yahoo.com> - 2013-07-14 08:04 -0700
Re: What is the best way to work with a dictionary Cecil Westerhof <Cecil@decebal.nl> - 2013-07-14 20:04 +0200
Re: What is the best way to work with a dictionary Olle <olavi.sakari@gmail.com> - 2013-07-15 06:13 -0700
Re: What is the best way to work with a dictionary Olle <olavi.sakari@gmail.com> - 2013-07-15 06:27 -0700
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