[Tex/LaTex] pgfplots legend symbol / icon

graphslegendpgfplots

I have made the following graph. I would like the icons / symbols for the different legends, to be more than a small line. I want it to be a square with the fill color in the graph. The code is the following:

\newcommand{\TwoDfill}[3]{
\begin{axis}[
        smooth,
        stack plots=y,
        area style,
        enlarge x limits=false,
        ybar,
        title={\Large{#2}},
        bar width=.3cm,
        width=.95\textwidth,
        height=\textwidth,
        legend style={at={(0.5,1)},
            anchor=north,legend columns=-1},
        symbolic x coords={1961--1972,1973--1978,1979--1998,1999--2006,2007--2010,2011+},
        xtick=data,
        ymin=0,ymax=#3,
        ylabel={Number of housings},
    ]
    \addplot table[x=interval,y=clA]{#1}\closedcycle;
    \addplot table[x=interval,y=clB]{#1}\closedcycle;
    \addplot table[x=interval,y=clC]{#1}\closedcycle;
    \addplot table[x=interval,y=clD]{#1}\closedcycle;
    \addplot table[x=interval,y=clE]{#1}\closedcycle;
    \addplot table[x=interval,y=clF]{#1}\closedcycle;
    \addplot table[x=interval,y=clG]{#1}\closedcycle;
    \legend{Class A, Class B, Class C, Class D, Class E, Class F, Class G,}
\end{axis}
}
\pgfplotstableread[row sep=\\,col sep=&]{
   interval &  clA & clB & clC & clD & clE & clF & clG\\
   1961--1972 & 39 & 225 & 6997 & 21265 & 11513 & 3490 & 707\\
   1973--1978 & 23 & 153 & 6331 & 10597 & 2381 & 306 & 46\\
   1979--1998 & 49 & 555 & 10603 & 3408 & 247 & 30 & 15\\
   1999--2006 & 4211 & 4211 & 3008 & 4211 & 4 & 2 & 1\\
   2007--2010 & 507 & 6552 & 829 & 26 & 4 & 1 & 0\\
   2011+ & 12350 & 1613 & 26 & 5 & 1 & 0 & 0\\
}\pchfv

\begin{tikzpicture}
    \TwoDfill{\pchfv}{Single-family house - District Heating}{45000}
\end{tikzpicture}

How can I make square symbols / icons in legend instead of lines?

Best Answer

You could create your own style. All I did was to adjust the example on p. 262 of the pgfplots manual.

\documentclass[border=5pt]{standalone}
\usepackage{pgfplots}
\pgfplotsset{compat=1.16} 
\pgfplotsset{% basis: example on p. 262 of the pgfplots manual
    /pgfplots/area legend/.style={
        /pgfplots/legend image code/.code={
            \fill[##1] (0cm,0.6em) rectangle (2*\pgfplotbarwidth,-0.3em);
}, },
}
\begin{document}
\newcommand{\TwoDfill}[3]{
\begin{axis}[
        smooth,
        stack plots=y,
        area style,
        enlarge x limits=false,
        ybar,
        title={\Large{#2}},
        bar width=.3cm,
        width=.95\textwidth,
        height=\textwidth,
        legend style={at={(0.5,1)},
            anchor=north,legend columns=-1},
        symbolic x coords={1961--1972,1973--1978,1979--1998,1999--2006,2007--2010,2011+},
        xtick=data,area legend, %<-added
        ymin=0,ymax=#3,
        ylabel={Number of housings},
    ]
    \addplot table[x=interval,y=clA]{#1}\closedcycle;
    \addplot table[x=interval,y=clB]{#1}\closedcycle;
    \addplot table[x=interval,y=clC]{#1}\closedcycle;
    \addplot table[x=interval,y=clD]{#1}\closedcycle;
    \addplot table[x=interval,y=clE]{#1}\closedcycle;
    \addplot table[x=interval,y=clF]{#1}\closedcycle;
    \addplot table[x=interval,y=clG]{#1}\closedcycle;
    \legend{Class A, Class B, Class C, Class D, Class E, Class F, Class G,}
\end{axis}
}
\pgfplotstableread[row sep=\\,col sep=&]{
   interval &  clA & clB & clC & clD & clE & clF & clG\\
   1961--1972 & 39 & 225 & 6997 & 21265 & 11513 & 3490 & 707\\
   1973--1978 & 23 & 153 & 6331 & 10597 & 2381 & 306 & 46\\
   1979--1998 & 49 & 555 & 10603 & 3408 & 247 & 30 & 15\\
   1999--2006 & 4211 & 4211 & 3008 & 4211 & 4 & 2 & 1\\
   2007--2010 & 507 & 6552 & 829 & 26 & 4 & 1 & 0\\
   2011+ & 12350 & 1613 & 26 & 5 & 1 & 0 & 0\\
}\pchfv

\begin{tikzpicture}
    \TwoDfill{\pchfv}{Single-family house - District Heating}{45000}
\end{tikzpicture}
\end{document}

EDIT: If you are worried that this way the legend becomes too wide, you can fix this e.g. as follows.

\documentclass[border=5pt]{standalone}
\usepackage{pgfplots}
\pgfplotsset{compat=1.16} 
\pgfplotsset{% basis: example on p. 262 of the pgfplots manual
    /pgfplots/area legend/.style={
        /pgfplots/legend image code/.code={
            \fill[##1] (0cm,0.6em) rectangle (0.9em,-0.3em);
}, },
}
\begin{document}
\newcommand{\TwoDfill}[3]{
\begin{axis}[
        smooth,
        stack plots=y,
        area style,
        enlarge x limits=false,
        ybar,
        title={\Large{#2}},
        bar width=.3cm,
        width=.95\textwidth,
        height=\textwidth,
        legend style={at={(0.5,1)},
            anchor=north,legend columns=2,transpose legend},
        symbolic x coords={1961--1972,1973--1978,1979--1998,1999--2006,2007--2010,2011+},
        xtick=data,area legend, %<-added
        ymin=0,ymax=#3,
        ylabel={Number of housings},
    ]
    \addplot table[x=interval,y=clA]{#1}\closedcycle;
    \addplot table[x=interval,y=clB]{#1}\closedcycle;
    \addplot table[x=interval,y=clC]{#1}\closedcycle;
    \addplot table[x=interval,y=clD]{#1}\closedcycle;
    \addplot table[x=interval,y=clE]{#1}\closedcycle;
    \addplot table[x=interval,y=clF]{#1}\closedcycle;
    \addplot table[x=interval,y=clG]{#1}\closedcycle;
    \legend{Class A, Class B, Class C, Class D, Class E, Class F, Class G,}
\end{axis}
}
\pgfplotstableread[row sep=\\,col sep=&]{
   interval &  clA & clB & clC & clD & clE & clF & clG\\
   1961--1972 & 39 & 225 & 6997 & 21265 & 11513 & 3490 & 707\\
   1973--1978 & 23 & 153 & 6331 & 10597 & 2381 & 306 & 46\\
   1979--1998 & 49 & 555 & 10603 & 3408 & 247 & 30 & 15\\
   1999--2006 & 4211 & 4211 & 3008 & 4211 & 4 & 2 & 1\\
   2007--2010 & 507 & 6552 & 829 & 26 & 4 & 1 & 0\\
   2011+ & 12350 & 1613 & 26 & 5 & 1 & 0 & 0\\
}\pchfv

\begin{tikzpicture}
    \TwoDfill{\pchfv}{Single-family house - District Heating}{45000}
\end{tikzpicture}
\end{document}

Related Solutions

[Tex/LaTex] pgfplots particular legend

To add a legend, you just have to call \addlegendentry{label text} at least once, or set the entry/entries in some other way (using \legend{<list of label texts>} or the legend entries={<list of label texts>} key). By default, the label texts are associated with the plots in the sequence they were created.

If, in your example, you add the command \addlegendentry{$f(x)$ after your \addplot command (or before, it doesn't technically matter, but it's more semantic to add it after). Then you will get

Note that a line is shown in the legend, even though it doesn't appear in the plot. That's because you created a line plot, and the legend image doesn't take your filling into account. If you use \addplot [area style] ..., the legend will look like

To add more lines to the legend without associated plots, you can call \addlegendimage{empty legend} and then \addlegendentry as usual. To have the label texts left aligned, you can call legend cell align=left.

\addlegendimage{empty legend}\addlegendentry{$\mu=0$}
\addlegendimage{empty legend}\addlegendentry{$\sigma^2=0.2$}

Here's the complete code:

\documentclass{article}
\usepackage{pgfplots}
\begin{document}
\pgfplotsset{width=10cm}
\begin{tikzpicture}
\makeatletter \newcommand{\pgfplotsdrawaxis}{\pgfplots@draw@axis} \makeatother
\pgfplotsset{axis line on top/.style={
 axis on top=false,
 after end axis/.append code={
    \pgfplotsset{axis line style=opaque,
      ticklabel style=opaque,
      tick style=opaque,
      grid=none}
    \pgfplotsdrawaxis}
  }
}
\pgfdeclarehorizontalshading{stefan}{50bp}{
color(0.00000000000000bp)=(violet);
color(8.33333333333333bp)=(blue);
color(16.66666666666670bp)=(cyan);
color(25.00000000000000bp)=(green);
color(33.33333333333330bp)=(yellow);
color(41.66666666666670bp)=(orange);
color(50.00000000000000bp)=(red)
}
\begin{axis}[
grid=major,
xmin=-0.3, xmax=0.3,
ymin=0, ymax=1,
point meta min={-0.3},
point meta max={0.3},
axis line on top,
tick style={thin,black},
xticklabel style={text height=1.5ex},
xticklabels={%
$-0.4$,
$-0.3$,
$-0.2$,
$-0.1$,
$\mu$,
$0.1$,
$0.2$,
$0.3$,
$0.4$},
extra x ticks={-0.4,-0.3,...,0.4},
extra x tick labels={%
$-0.4$,
$-0.3$,
$-0.2$,
$-0.1$,
$\mu$,
$0.1$,
$0.2$,
$0.3$,
$0.4$},
extra x tick style={
    xticklabel pos=right,
    xticklabel style={text depth=0pt}
},
extra y ticks={0,0.2,...,1},
extra y tick style={
    yticklabel pos=right
},
minor tick num=4,
xlabel=\large $x$,
ylabel=\large $f_{\mu,\sigma^2}(x)$,
colorbar horizontal,
colorbar style={
    xticklabels={%
        $-0.4$,
        $-0.3$,
        $-0.2$,
        $-0.1$,
        $\mu$,
        $0.1$,
        $0.2$,
        $0.3$,
        $0.4$
    },
    xticklabel style={text height=1.5ex}
},
no markers,
colormap={new}{color(0cm)=(violet);color(1cm)=(blue);color(2cm)=(cyan);color(3cm)=(green);color(4cm)=(yellow);color(5cm)=(orange);color(6cm)=(red)},
after end axis/.append code={
    \draw ({rel axis cs:0,0}-|{axis cs:0,0}) -- ({rel axis cs:0,1}-|{axis cs:0,0});
},
legend cell align=left]
\addplot[area style] gnuplot[
    shading=stefan,
    draw=none,
    shader=interp,
    id=DoG,
    samples=1000,
    domain=-0.3:0.3,
    y domain=0:1
]{((1/(sqrt(2*pi*0.00570275999999999)))*exp(-(x-0)**2/(2*0.00570275999999999))/6.603550926)}\closedcycle;
\addlegendentry{$f(x)$}
\addlegendimage{empty legend}\addlegendentry{$\mu=0$}
\addlegendimage{empty legend}\addlegendentry{$\sigma^2=0.2$}
\end{axis}
\end{tikzpicture}
\end{document}

[Tex/LaTex] Pgfplots, Legend Color

Actually, I found the answer. The problem seems to be that if I include other plots which not appear in the legend, TeX messes up. Once I put the plots with legend entries directly underneath each other and everything else at the end of the document it worked! Thanks for your support!

Best Answer

Related Solutions

[Tex/LaTex] pgfplots particular legend

[Tex/LaTex] Pgfplots, Legend Color

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