On Mo, 2010-11-01 at 19:54 +0000, Joseph Wright wrote:
> On 01/11/2010 19:34, Stefan Schulze Frielinghaus wrote:
> > Hi Joseph
> >
> > On Sa, 2010-10-30 at 16:51 +0100, Joseph Wright wrote:
> >> Did you try varying the other corners of each square? From my quick
> >> tests, I think that the colour is based on the average of the four
> >> corners. So in your case everything is moved up as three of the four
> >> corners are big values and only one is zero.
> >
> > Hmm but that would mean, that the color of the plot would differ from
> > the colorbar, too. Nevertheless, I tried that and more or less the same
> > result showed up, except of the two other corners which I changed to
> > z=0.0
> >
> > Any other idea? I'm kinda out of luck with this. In a *bigger* example
> > GNUPlot comes up with a dark blue diagonal as expected so I guess this
> > is a PGFPlots thing.
> >
> > Best regards,
> > Stefan
>
> Reading the manual, I find the option 'shader = flat corner', which
> seems to be what you want:
>
> \documentclass{minimal}
>
> \usepackage{tikz}
> \usepackage{pgfplots}
>
> \pgfplotsset{compat=1.3}
>
> \begin{document}
> \begin{tikzpicture}
> \begin{axis}[view={0}{90}, colorbar]
> \addplot3[surf, shader = flat corner] file {test.dat};
> \end{axis}
> \end{tikzpicture}
> \end{document}
Yes that's it! Reading the manual the default shader uses the mean color
of four adjacent entries. This is exactly the behavior I noticed but in
this particular case I want the "exact" value and no mean.
Thanks for all your help!
Best regards,
Stefan
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