On 7/12/2016 9:39 PM, Henri Menke wrote:
Dear Aditya and Hans,

I'm not so sure about it being a bug in pgfplots.  I played a little and
encountered the following.

As Aditya pointed out, these (probably used for tracing) colors are defined in such a way that they don't go via the context resolver. As these (few) colors are basically x windows colors, you can start your document with:

\usecolors[xwi]

which will set the context colors differently.

\usemodule[tikz]
\starttext

% Original gray
\blackrule[color=gray,width=1cm,height=1pt]

\starttikzpicture
  \draw[gray,line width=1pt] (0,0) -- (1,0);
\stoptikzpicture

% New colors
\definecolor[gray][s=0.5]
\unprotect
\pgfutil@definecolor{tikzgray}{gray}{0.5}
\protect

% Now ConTeXt's gray = tikzgray
\blackrule[color=gray,width=1cm,height=1pt]

How is that supposed to work? Context will not inherit colors from tikz, the most you can expect is the reverse: tikz using context color definitions.

\starttikzpicture
  \draw[tikzgray,line width=1pt] (0,0) -- (1,0);
\stoptikzpicture

% Inside TikZ gray is still off
\starttikzpicture
  \draw[gray,line width=1pt] (0,0) -- (1,0);
\stoptikzpicture

\stoptext

Cheers,
Henri

On 07/12/2016 08:23 PM, Aditya Mahajan wrote:
On Tue, 12 Jul 2016, Hans Hagen wrote:

On 7/12/2016 5:07 PM, Aditya Mahajan wrote:
On Tue, 12 Jul 2016, Hans Hagen wrote:

On 7/12/2016 3:44 PM, Henri Menke wrote:
Dear Hans,

thanks for your reply.  Indeed there are color definitions in
`pgfutil-context.def`.  However, they are commented out with the
message

% no need for x colors (users can load it if needed)
...
%\pgfutil@definecolor{gray}{gray}{0.5}

If I add

\csname pgfutil@definecolor\endcsname{gray}{gray}{0.5}

to my document the gray shows up fine.  So that's for sure a feasible
workaround.

Can you comment on the phrase »no need for x colors (users can load it
if needed)«?  I'm not quite sure what it means and it suggests that
there exists a proper solution to my color problem.

normally you want the same colors in tikz images as in context so then
defining them in tikz is creating incompatibilities (your case is the
reverse and a-typical)

However, without such redefinitions, tikz does not understand ConTeXt
colors. I use a similar workaround in my documents as well.

I have no clue what you mean.

\definecolor[red][g=1]

\startTEXpage
    \starttikzpicture
       \fill[red] (0,0) circle (1cm);
    \stoptikzpicture
\stopTEXpage

works ok here and gives green. So, one can collect a list of colors
defined in tikz in a colo-imp-tikz.mkiv and load that one if needed.

I guess it is a bug with pgfplots rather than tikz (which also means
that it may be easier to pursuade pgfplot maintainers to use low level
tikz interface, since tikz is already playing nice with context).

\usemodule[tikz,pgfplots]
\definecolor[red][g=1]

\startmode[bug]
\unprotect
\pgfutil@definecolor{red}   {rgb} {0,1,0}
\protect
\stopmode

\starttext
\startTEXpage
     \starttikzpicture
       \startaxis
         \addplot[color=red] coordinates { (0,0) (1,1) };
       \stopaxis
     \stoptikzpicture
\stopTEXpage
\stoptext

Aditya


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