[Tex/LaTex] pgfplot legend with fill, of fill between two curves

fillbetweenlegendpgfplotstikz-pgf

I would lie to make a legend where the legend marker is the fill of the area. However, when filling between two curves in pgfplots the lines are defined before the fill, so I have idea how to do this.

My current MWE:

\documentclass[border=0.5]{standalone}                                                                                                                                             
\usepackage[utf8]{inputenc}                                                                                                                                                        
\usepackage[T1]{fontenc}                                                                                                                                                           
\usepackage{mathtools,amsmath}                                                                                                                                                     
\usepackage{tikz}                                                                                                                                                                  
\usepackage{pgfplots}                                                                                                                                                              
\pgfplotsset{compat=1.15}                                                                                                                                                          
\usetikzlibrary{patterns}                                                                                                                                                          
\usepgfplotslibrary{fillbetween}                                                                                                                                                   
\begin{document}                                                                                                                                                                   
\begin{tikzpicture}                                                                                                                                                                
\begin{axis}                                                                                                                                                                       
        [                                                                                                                                                                          
        mark = none,                                                                                                                                                               
        axis equal,                                                                                                                                                                
        xmin = 0,                                                                                                                                                                  
        xmax = 2,                                                                                                                                                                  
        ymin = 0,                                                                                                                                                                  
        ymax = 2,                                                                                                                                                                  
        ]                                                                                                                                                                          
        \addplot[pattern= dots, samples = 3, domain = 0:1, pattern color = red] {1}\closedcycle;                                                                                   
        \addplot+[name path global = A, color = black, mark=none, domain = 1:2] {1};                                                                                               
        \addplot+[name path global = B, color = black, mark=none, domain = 1:2] {2};                                                                                               
        \addplot[pattern = north west lines, pattern color = green] fill between[of=A and B];                                                                                      
        \draw [color = black] (axis cs:1,1) -- (axis cs:1,2);                                                                                                                      
        \draw [color = black] (axis cs:2,1) -- (axis cs:2,2);                                                                                                                      
        \filldraw [color = blue] (axis cs:1,1) circle (0.005);                                                                                                                     
        \legend{ First electron, Other electron}                                                                                                                                   
\end{axis}                                                                                                                                                                         
\end{tikzpicture}                                                                                                                                                                  
\end{document}

This produces:

Where I would like the black lines to be the pattern of the squares.

Thanks in advance 😉

P.S.: I do realize that the current legend placement is horrible, but no point in moving it if I would rather explain myself in a caption 😉

Best Answer

So you want do do something like the following?
For details please have a look at the comments in the code.

% used PGFPlots v1.15
\documentclass[border=5pt]{standalone}
\usepackage{pgfplots}
    \usetikzlibrary{
        patterns,
        pgfplots.fillbetween,
    }
    \pgfplotsset{
        compat=1.15,
    }
\begin{document}
\begin{tikzpicture}
    \begin{axis}[
        no markers,                 % <-- changed from `mark=none'
        axis equal,
        xmin=0,
        xmax=2,
        ymin=0,
        ymax=2,
    ]
        \addplot [
            pattern=dots,
            samples=3,
            domain=0:1,
            pattern color=red,
            area legend,            % <-- added to change the type of legend symbol
        ] {1}
            \closedcycle
        ;

        \addplot [
            draw=none,              % <-- added, so it is invisible
            forget plot,            % <-- added, so it doesn't count for the legend
            name path global=A,
            domain=1:2,
        ] {1};
        \addplot [
            draw=none,              % <-- added, so it is invisible
            forget plot,            % <-- added, so it doesn't count for the legend
            name path global=B,
            domain=1:2,
        ] {2};
        \addplot [
            pattern=north west lines,
            pattern color=green,
            draw=black,             % <-- added to draw the frame
        ] fill between [of=A and B];

        \filldraw [color = blue] (axis cs:1,1) circle (0.005);

        \legend{
            First electron,
            Other electron
        }
    \end{axis}
\end{tikzpicture}
\end{document}

Related Solutions

PGFPlots – How to Plot Two Time Series with Bounds Using PGFPlots

This happens because PGFPlots only uses one "stack" per axis: You're stacking the second confidence interval on top of the first. The easiest way to fix this is probably to use the approach described in "Is there an easy way of using line thickness as error indicator in a plot?": After plotting the first confidence interval, stack the upper bound on top again, using stack dir=minus. That way, the stack will be reset to zero, and you can draw the second confidence interval in the same fashion as the first:

\documentclass{standalone}
\usepackage{pgfplots, tikz}

\usepackage{pgfplotstable}

\pgfplotstableread{
temps   y_h y_h__inf    y_h__sup    y_f y_f__inf    y_f__sup    

1   0.237340    0.135170    0.339511    0.237653    0.135482    0.339823    
2   0.561320    0.422007    0.700633    0.165871    0.026558    0.305184    
3   0.694760    0.534205    0.855314    0.074856    -0.085698   0.235411    
4   0.728306    0.560179    0.896432    0.003361    -0.164765   0.171487    
5   0.711710    0.544944    0.878477    -0.044582   -0.211349   0.122184    
6   0.671241    0.511191    0.831291    -0.073347   -0.233397   0.086703    
7   0.621177    0.471219    0.771135    -0.088418   -0.238376   0.061540    
8   0.569354    0.431826    0.706882    -0.094382   -0.231910   0.043146    
9   0.519973    0.396571    0.643376    -0.094619   -0.218022   0.028783    
10  0.475121    0.366990    0.583251    -0.091467   -0.199598   0.016664    
}{\table}

\begin{document}
\begin{tikzpicture}

    \begin{axis}
    % y_h confidence interval
    \addplot [stack plots=y, fill=none, draw=none, forget plot]   table [x=temps, y=y_h__inf]   {\table} \closedcycle;
    \addplot [stack plots=y, fill=gray!50, opacity=0.4, draw opacity=0, area legend]   table [x=temps, y expr=\thisrow{y_h__sup}-\thisrow{y_h__inf}]   {\table} \closedcycle;
    % subtract the upper bound so our stack is back at zero
    \addplot [stack plots=y, stack dir=minus, forget plot, draw=none] table [x=temps, y=y_h__sup] {\table};

    % y_f confidence interval
    \addplot [stack plots=y, fill=none, draw=none, forget plot]   table [x=temps, y=y_f__inf]   {\table} \closedcycle;
    \addplot [stack plots=y, fill=gray!50, opacity=0.4, draw opacity=0, area legend]   table [x=temps, y expr=\thisrow{y_f__sup}-\thisrow{y_f__inf}]   {\table} \closedcycle;

    % the line plots (y_h and y_f)    
    \addplot [stack plots=false, very thick,smooth,blue]  table [x=temps, y=y_h]   {\table};
    \addplot [stack plots=false, very thick,smooth,blue]  table [x=temps, y=y_f]   {\table};
    \end{axis}

\end{tikzpicture}
\end{document}

PGFPlots – How to Hide Empty Ybars in Bar Charts

You can use

 y filter/.expression={y==0 ? nan : y}

in the options of \addplot.

\documentclass{article}

% ---------------------------------- tikz
\usepackage{pgfplots}          % to print charts
\pgfplotsset{compat=1.12}

\begin{document}

\begin{figure}
  \centering
  \begin{tikzpicture}
    \begin{axis} [
      % general
      ybar,
      scale only axis,
      height=0.5\textwidth,
      width=1.2\textwidth,
      ylabel={\# Dots},
      nodes near coords,
      xlabel={Variation},
      xticklabel style={
        rotate=90,
        anchor=east,
      },
      %enlarge x limits={abs value={3}},
      ]
      \addplot+[y filter/.expression={y==0 ? nan : y}] table [
        x=grade,
        y=value,
      ] {
grade   value
-11 0
-10 0
-9  0
-8  0
-7  0
-6  0
-5  3
-4  1
-3  2
-2  15
-1  11
0   179
1   8
2   1
3   0
4   1
5   2
6   0
7   0
8   0
9   0
10  0
11  0
      };
    \end{axis}
  \end{tikzpicture}
\end{figure}
\end{document}

Best Answer

Related Solutions

PGFPlots – How to Plot Two Time Series with Bounds Using PGFPlots

PGFPlots – How to Hide Empty Ybars in Bar Charts

Related Question