Re: [NTG-context] t-tikz: problem with colorspace pgfprgb

3 Mar 2008


      On Mon, 3 Mar 2008, Mojca Miklavec wrote:
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On Mon, Mar 3, 2008 at 6:15 AM, Aditya Mahajan wrote:
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On Sun, 2 Mar 2008, Finn Martensen wrote:
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2008/3/2, Aditya Mahajan :
...
...
I have the following problem with TikZ: When I use the "patterns"
library in a tikzpicture environment, the file is compiled without
problems and creates a PDF file. However, Acrobat displays an error
message "Could not find the ColorSpace named 'pgfprgb'". [...]
Can you please post a minimal example? I have compiled a few examples
 from the tikz manual by using all tikz librarries, but never had this
 problem.
It just discovered that it depends, e.g., on whether there is only one
page with a tikzpicture or more pages with tikzpictures. To give code
examples: the first works, but not the second
**************************************
Code with no problems:
**************************************
\usemodule[tikz]
\usetikzlibrary[patterns]
\starttext
\starttikzpicture
\fill[pattern=dots] (0,0) -- (0,1) -- (1,1) -- (1,0);
\stoptikzpicture
\stoptext
**************************************
Code with problems:
**************************************
\usemodule[tikz]
\usetikzlibrary[patterns]
\starttext
\starttikzpicture
\draw (0,0) -- (1,0);
\stoptikzpicture
\page
\starttikzpicture
\fill[pattern=dots] (0,0) -- (0,1) -- (1,1) -- (1,0);
\stoptikzpicture
\stoptext
I can reproduce this problem. On linux, with evince pdf viewer (2.21.91) I
 get "Error: Bad color space 'pgfprgb'", with Adobe reader (8.1.2) "Wrong
 operand type".
The example does work fine with plain TeX and LaTeX. Something
 wrong in the way patterns are handled by tikz for context. I do not think
 that anyone on this list understands the internals of TikZ. Your best bet
 is to report this to the tikz-mailing list.
Till Tantau has already replied (privately):
...
I tracked down this problem. It turns out that ConTeXt does, well,
 radical things with the page resources (it simply resets them after
 each page, which is why a pattern cannot be used on any page other
 than the page on which it is defined). I'll try to fix this later,
 although ConTeXt could be a bit less aggressive, here...
--------
...
I fixed this in the CVS. You will have to check it out to use the patch.
The main problem is that pgf and context both fight over who can set
 page resources. As there is no clean way to do this, both pgf and
 context have their own systems.
Actually, context's system is a bit cleaner, but we also have to
 support latex and plain tex.
Anyway, I put in some patches that should solve the problem under
 normal circumstances. If you use ConTeXt commands that also mess
 around with extended graphic states, some further changes would
 presumably be necessary, but I'm not sure.
Works well the minimal example that Finn posted.
...
So ... feel free to test it (should I set up automatic updates of tikz
from cvs for the minimals?).
That will be nice. Actually, what do you mirror at the minimals, the 
current context stable or the current beta?

Aditya