[Tex/LaTex] Custom colormap breaks colorbar: Cannot remove border and Mac Preview doesn’t show colorbar

colorpgfplots

I have a custom colormap. And I have a plot with a colorbar.

Without custom colormap: No border around the colorbar, as intended. Looks perfectly fine in Mac Preview.

With custom colormap: Black border around the colorbar in TeX-studio preview. No colorbar, only black frame, in Mac Preview.

Here a MWE. Just uncomment the custom colorbar and hopefully you will get the same strange result as I do and know how to fix it:

\documentclass{article}
\usepackage[dvipsnames]{xcolor}
\usepackage{tikz,pgfplots}

%\pgfplotsset{colormap={blueColormap}{[2pt]%
%       color(0000pt)=(RoyalBlue!50!black);
%       color(1000pt)=(RoyalBlue!50!black);
%       color(1000pt)=(RoyalBlue!70!black);
%       color(2000pt)=(RoyalBlue!70!black);
%       color(2000pt)=(RoyalBlue!90!black);
%       color(3000pt)=(RoyalBlue!90!black);
%       color(3000pt)=(RoyalBlue!90!white);
%       color(4000pt)=(RoyalBlue!90!white);
%       color(4000pt)=(RoyalBlue!70!white);
%       color(5000pt)=(RoyalBlue!70!white);
%       color(5000pt)=(RoyalBlue!50!white);
%       color(6000pt)=(RoyalBlue!50!white);
%   }
%}


\begin{document}
    \begin{tikzpicture}
        \begin{axis}[
                colorbar,
                colorbar style={
                    ytick style={draw=none},
                    ytick={0,1,2,3,4,5,6},
                    yticklabels={0,1,2,3,4,5,6},
                    axis line style = { draw = none }
                },
                point meta min=0, 
                point meta max=6
            ]
            \foreach \n in {0,1,...,5}
                %{\edef\temp{\noexpand
                \addplot[ultra thick, smooth,mesh,point meta={\n+0.5},domain={0:1}] {x^\n}; %}\temp}
        \end{axis}
    \end{tikzpicture}
\end{document}

Best Answer

The root cause is that your colormap definition is invalid and pgfplots failed to complain: the colormap contains multiple values for the same offset.

The problem can be reduced to the following minimal example:

\documentclass{standalone}
\usepackage[dvipsnames]{xcolor}
\usepackage{pgfplots}

\pgfplotsset{colormap={blueColormap}{%[2pt]%
       color(0000pt)=(RoyalBlue!50!black);
       color(1000pt)=(RoyalBlue!50!black);
       color(1000pt)=(RoyalBlue!70!black);
       color(2000pt)=(RoyalBlue!70!black);
       color(2000pt)=(RoyalBlue!90!black);
       color(3000pt)=(RoyalBlue!90!black);
       color(3000pt)=(RoyalBlue!90!white);
       color(4000pt)=(RoyalBlue!90!white);
       color(4000pt)=(RoyalBlue!70!white);
       color(5000pt)=(RoyalBlue!70!white);
       color(5000pt)=(RoyalBlue!50!white);
       color(6000pt)=(RoyalBlue!50!white);
   }
}


\begin{document}
    \begin{tikzpicture}
        \begin{axis}[
                colorbar,
                point meta min=0, 
                point meta max=6
            ]
        \end{axis}
    \end{tikzpicture}
\end{document}

This example shows fine in evince and xpdf, but Acrobat Reader shows a popup that the pdf is invalid.

The solution is to eliminate double offsets. The following works fine:

\documentclass{standalone}
\usepackage[dvipsnames]{xcolor}
\usepackage{pgfplots}

\pgfplotsset{colormap={blueColormap}{%[2pt]%
       color(0000pt)=(RoyalBlue!50!black);
       color(1000pt)=(RoyalBlue!50!black);
       %color(1000pt)=(RoyalBlue!70!black);
       color(2000pt)=(RoyalBlue!70!black);
       %color(2000pt)=(RoyalBlue!90!black);
       color(3000pt)=(RoyalBlue!90!black);
       %color(3000pt)=(RoyalBlue!90!white);
       color(4000pt)=(RoyalBlue!90!white);
       %color(4000pt)=(RoyalBlue!70!white);
       color(5000pt)=(RoyalBlue!70!white);
       %color(5000pt)=(RoyalBlue!50!white);
       color(6000pt)=(RoyalBlue!50!white);
   }
}


\begin{document}
    \begin{tikzpicture}
        \begin{axis}[
                colorbar,
                point meta min=0, 
                point meta max=6
            ]
        \end{axis}
    \end{tikzpicture}
\end{document}

or, in order to keep your "jumps":

\documentclass{standalone}
\usepackage[dvipsnames]{xcolor}
\usepackage{pgfplots}

\pgfplotsset{colormap={blueColormap}{[2pt]%
       color(0000pt)=(RoyalBlue!50!black);
       color(1000pt)=(RoyalBlue!50!black);
       color(1002pt)=(RoyalBlue!70!black);
       color(2000pt)=(RoyalBlue!70!black);
       color(2002pt)=(RoyalBlue!90!black);
       color(3000pt)=(RoyalBlue!90!black);
       color(3002pt)=(RoyalBlue!90!white);
       color(4000pt)=(RoyalBlue!90!white);
       color(4002pt)=(RoyalBlue!70!white);
       color(5000pt)=(RoyalBlue!70!white);
       color(5002pt)=(RoyalBlue!50!white);
       color(6000pt)=(RoyalBlue!50!white);
   }
}


\begin{document}
    \begin{tikzpicture}
        \begin{axis}[
                colorbar,
                point meta min=0, 
                point meta max=6
            ]
        \end{axis}
    \end{tikzpicture}
\end{document}

Note that this last file takes a very long time since the colormap contains thousands of data points -- and since the involved colors are given in CMYK which requires extra effort (compare the warning stated by pgfplots).

My suggestions to overcome performance limitations are * reduce the sampling density of the colormap (i.e. do not use 2pt as mesh width on a scale of [0:6000], increase the mesh width considerably) * redefine the input color as RGB color which simplifies the rendering of the color bar

EDIT

You also asked "why is there an unanticipated black frame, but only for my custom colormap?"

This is due to the fact that blueColormap is a CMYK colormap (because RoyalBlue is defined in CMYK). Pgfplots can handle CMYK shadings, but PGF cannot. In order to satisty this constraint, Pgfplots applies special steps for the colorbar which, unfortunately, cause draw=none to be ignored. I have just found and fixed this issue; it was present whenever an \addplot3 statement occurred in an axis.

A simple workaround is to add colormap default colorspace=rgb before you define your custom colormap:

\documentclass{standalone}
\usepackage[dvipsnames]{xcolor}
\usepackage{pgfplots}

\pgfplotsset{
    colormap default colorspace=rgb,
    colormap={blueColormap}{
       color(0000pt)=(RoyalBlue!50!black);
       color(1000pt)=(RoyalBlue!50!black);
       color(2000pt)=(RoyalBlue!70!black);
       color(3000pt)=(RoyalBlue!90!black);
       color(4000pt)=(RoyalBlue!90!white);
       color(5000pt)=(RoyalBlue!70!white);
       color(6000pt)=(RoyalBlue!50!white);
   }
}

\begin{document}
    \begin{tikzpicture}
        \begin{axis}[
                colorbar,
                colorbar style={
                    axis line style={draw=none},
                },
                point meta min=0, 
                point meta max=6
            ]
        \end{axis}
    \end{tikzpicture}
\end{document}

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Add

     axis x line*=bottom,
     ymin=0

to the axis options:

\documentclass{scrbook}
\usepackage{pgfplots}
\begin{document}
\begin{tikzpicture}
\begin{axis}[
     width  = 12cm,
     hide y axis,
     axis x line*=bottom,
     height = 8cm,
     bar width=20pt,
     symbolic x coords={2010, 2011, 2012, 2013, 2014, 2015},
     nodes near coords,
     ymin=0
     ]
     \addplot[ybar, fill=black] coordinates {
          (2010,1)
          (2011,3)
          (2012,11)
          (2013,15)
          (2014,29)
          (2015,14)
     };
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\end{document}

[Tex/LaTex] pgfplots: percentage in matrix plot

It does not work in your MWE because you are overwriting it by also giving the option nodes near coors to the \addplot command. Remove the latter one (or specify format here), and it will print. I added a thinspace before the percentage sign, although it can also be recommended to load the siunitx package and let that format and typeset the values for you.

Anyway, here's the quickfixed version:

\documentclass[border=3pt]{standalone}
\usepackage{pgfplots}
\pgfplotsset{%
  width=5cm,
  height=18cm,
  compat=1.13,
  colormap={blackwhite}{gray(0cm)=(1); gray(1cm)=(0.5)},
  xticklabels={LPIBG, ALL, HPIBG},
  xtick={0,...,2},
  ytick=\empty
}

\begin{document}
\begin{tikzpicture}
\begin{axis}[%
  enlargelimits=false,
  xlabel style={font=\footnotesize},
  ylabel style={font=\footnotesize},
  legend style={font=\footnotesize},
  xticklabel style={font=\footnotesize},
  yticklabel style={font=\footnotesize},
  colorbar,
  colorbar style={%
    ytick={0,20,40,60,80,100},
    yticklabels={0,20,40,60,80,100},
    yticklabel={\pgfmathprintnumber\tick\,\%},
    yticklabel style={font=\footnotesize}
  },
  point meta min=0,
  point meta max=100,
  nodes near coords={\pgfmathprintnumber\pgfplotspointmeta\,\%},
  every node near coord/.append style={xshift=0pt,yshift=-7pt, black, font=\footnotesize},
]

\addplot[
matrix plot,
mesh/cols=3,
point meta=explicit]
table[meta=C]{
  x y C
  0 0 80
  1 0 36
  2 0 40
  0 1 64
  1 1 80
  2 1 60
  0 2 52
  1 2 84
  2 2 72
  0 3 72
  1 3 28
  2 3 32
  0 4 56
  1 4 84
  2 4 80
  0 5 72
  1 5 52
  2 5 44
  0 6 4
  1 6 84
  2 6 41
  0 7 37
  1 7 69
  2 7 84
  0 8 63
  1 8 53
  2 8 82
  0 9 78
  1 9 74
  2 9 39
  0 10 39
  1 10 63
  2 10 88
  0 11 76
  1 11 74
  2 11 49
  0 12 39
  1 12 6
  2 12 88
  0 13 46
  1 13 33
  2 13 75
  0 14 88
  1 14 67
  2 14 54
  0 15 79
  1 15 83
  2 15 75
  0 16 50
  1 16 46
  2 16 71
  0 17 92
  1 17 71
  2 17 75
  0 18 46
  1 18 33
  2 18 8
};
\end{axis}
\end{tikzpicture}
\end{document}

Best Answer

Related Solutions

[Tex/LaTex] pgfplot – remove “top-border-line” and spacing between x-axis and bars

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