ConTeXt colours in TikZ

ConTeXt colours in TikZ

[Marco]

Hi everybody,

I don't get context colours working in tikz. There were several
issues on the mailing list in the past and the solution always seems
to be some kind of hack. But none of the hacks work (with a current
context). Example:

\usemodule   [tikz]
\definecolor [darkblue] [b=.2]
\starttext
  \starttikzpicture
    % works
    \fill [blue] (0,0) circle(1);

    % fails
    % \fill [darkblue] (0,0) circle(1);
  \stoptikzpicture
\stoptext

I get the following error:

Runaway argument?
0 0 0.2 rg 0 0 0.2 RG\pgf@stop {darkblue}\else \edef \pgf@marshal {\noexpand \ETC.
! File ended while scanning use of \pgfutil@context@parse@gray.

system          > tex > error on line 0 in file : File ended while scanning use of \pgfutil@conte
xt@parse@gray ...

<empty file>

<inserted text>
                \par

Marco


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Re: ConTeXt colours in TikZ

[Hans Hagen]

On 15-5-2012 12:16, Marco wrote:
> Hi everybody,
>
> I don't get context colours working in tikz. There were several
> issues on the mailing list in the past and the solution always seems
> to be some kind of hack. But none of the hacks work (with a current
> context). Example:
>
> \usemodule   [tikz]
> \definecolor [darkblue] [b=.2]
> \starttext
>    \starttikzpicture
>      % works
>      \fill [blue] (0,0) circle(1);
>
>      % fails
>      % \fill [darkblue] (0,0) circle(1);
>    \stoptikzpicture
> \stoptext
>
> I get the following error:
>
> Runaway argument?
> 0 0 0.2 rg 0 0 0.2 RG\pgf@stop {darkblue}\else \edef \pgf@marshal {\noexpand \ETC.
> ! File ended while scanning use of \pgfutil@context@parse@gray.
>
> system>  tex>  error on line 0 in file : File ended while scanning use of \pgfutil@conte
> xt@parse@gray ...
>
> <empty file>
>
> <inserted text>
>                  \par

In pgfutil-context.def there is a macro

\def\pgfutil@registercolor#1{%
   \edef\pgf@temp{\PDFcolor{#1}}%
   \edef\pgf@marshal{\noexpand\pgfutil@in@{g}{\pgf@temp}}%
   \pgf@marshal
   \ifpgfutil@in@
     \expandafter\pgfutil@context@parse@gray\pgf@temp\pgf@stop{#1}%
   \else
     \edef\pgf@marshal{\noexpand\pgfutil@in@{rg}{\pgf@temp}}%
     \pgf@marshal
     \ifpgfutil@in@
       \expandafter\pgfutil@context@parse@rgb\pgf@temp\pgf@stop{#1}%
     \else
       \edef\pgf@marshal{\noexpand\pgfutil@in@{k}{\pgf@temp}}%
       \pgf@marshal
       \ifpgfutil@in@
         \expandafter\pgfutil@context@parse@cmyk\pgf@temp\pgf@stop{#1}%
       \else
         \PackageError{pgf}{Color #1 has an unsupported color model.}{}%
         \pgfutil@definecolor{#1}{gray}{0}%
       \fi
     \fi
   \fi
}

which tests for gray (g) before rgb (rg) but I think should reverse that 
order

\def\pgfutil@registercolor#1{%
   \edef\pgf@temp{\PDFcolor{#1}}%
   \edef\pgf@marshal{\noexpand\pgfutil@in@{rg}{\pgf@temp}}%
   \pgf@marshal
   \ifpgfutil@in@
     \expandafter\pgfutil@context@parse@rgb\pgf@temp\pgf@stop{#1}%
   \else
     \edef\pgf@marshal{\noexpand\pgfutil@in@{g}{\pgf@temp}}%
     \pgf@marshal
     \ifpgfutil@in@
       \expandafter\pgfutil@context@parse@gray\pgf@temp\pgf@stop{#1}%
     \else
       \edef\pgf@marshal{\noexpand\pgfutil@in@{k}{\pgf@temp}}%
       \pgf@marshal
       \ifpgfutil@in@
         \expandafter\pgfutil@context@parse@cmyk\pgf@temp\pgf@stop{#1}%
       \else
         \PackageError{pgf}{Color #1 has an unsupported color model.}{}%
         \pgfutil@definecolor{#1}{gray}{0}%
       \fi
     \fi
   \fi
}

feel free to test this and submit it as patch to the tikz maintainers.

For mkiv the whole checker/converter can be replaced by a few lines of 
code but I won't bother you with that.

Hans



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___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
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wiki     : http://contextgarden.net
___________________________________________________________________________________

Re: ConTeXt colours in TikZ

[Marco]

On 2012-05-15 Hans Hagen <pragma@wxs.nl> wrote:

> In pgfutil-context.def there is a macro
> 
> […]
> 
> which tests for gray (g) before rgb (rg) but I think should reverse that 
> order
> 
> […]
> 
> feel free to test this and submit it as patch to the tikz maintainers.

Thanks for the code. I tested the code with the graphs I created so
far and it seems to work fine. However, my graphics don't fiddle
with “fancy” stuff (transparency, etc.). I submitted the patch and a
bug report. The future will show the side effects.

> For mkiv the whole checker/converter can be replaced by a few lines of 
> code but I won't bother you with that.

I have no clue about the internals of the colour models of
ConTeXt and TikZ. You don't want me to mess with that :)


Regards

Marco Patzer


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Re: ConTeXt colours in TikZ

[Philipp A.]

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also check this:
http://tex.stackexchange.com/questions/27952/cmyk-context-colors-in-tikz

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___________________________________________________________________________________
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maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
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___________________________________________________________________________________

Re: ConTeXt colours in TikZ

[Marco]

On 2012-05-18 "Philipp A." <flying-sheep@web.de> wrote:

> also check this:
> http://tex.stackexchange.com/questions/27952/cmyk-context-colors-in-tikz

The colour conversion code is already included in the tikz module.
But it works only for cmyk colours, for rgb it fails:

\definecolor [c] [c=1] % works
\definecolor [b] [b=1] % fails

I submitted a bug report including Hans' patch which, at least for
me, doesn't seem to break anything. We'll see how long it will take
to include the fix.

Marco


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