I'm trying to center the node values, at the middle of each bar, in a stacked plot. However I can only put those nodes in the top of each bar. Is it possible to move those down? To the center of each bar to be more precise.
\documentclass{article}
\usepackage{tikz}
\usepackage{pgfplots}
\begin{document}
\begin{tikzpicture}
\begin{axis}[
x tick label style={
/pgf/number format/1000 sep=},
ylabel=Population,
enlargelimits=0.05,
legend style={at={(0.5,-0.15)},
anchor=north,legend columns=-1},
ybar stacked,
nodes near coords, nodes near coords align={center},
]
\addplot
coordinates {(1930,50e6) (1940,33e6)
(1950,40e6) (1960,50e6) (1970,70e6)};
\addplot
coordinates {(1930,38e6) (1940,42e6)
(1950,43e6) (1960,45e6) (1970,65e6)};
\addplot
coordinates {(1930,15e6) (1940,12e6)
(1950,13e6) (1960,25e6) (1970,35e6)};
\addplot
coordinates {(1930,15e6) (1940,12e6)
(1950,13e6) (1960,25e6) (1970,35e6)};
\legend{Far,Near,Here,There}
\end{axis}
\end{tikzpicture}
\end{document}
So this is what I got
Edit
Ok, thanks to Jake now the example above works. I also notice that my example using floats wasn't working because I didn't use the \makeatletter after the document.
However, when I'm using float values using the solution the bars don't appear as they are when not using them.
Before using the values:
And after the example I got:
The code is this
\documentclass{standalone}
\usepackage{tikz}
\usepackage{pgfplots}
\pgfplotstableread{
1 19.178 26.027 8.219 6.849 39.726
2 54.795 21.918 4.110 6.849 12.329
3 28.767 16.438 6.849 8.219 39.726
4 63.014 2.740 2.740 2.740 28.767
5 90.411 1.370 6.849 0.000 1.370
6 15.068 2.740 16.438 8.219 57.534
7 67.123 0.000 0.000 0.000 32.877
8 72.603 6.849 5.479 0.000 15.068
9 56.164 12.329 6.849 4.110 20.548
10 50.685 4.110 8.219 1.370 35.616
}\datatable
\begin{document}
\makeatletter
\begin{tikzpicture}
\begin{axis}[
ylabel=label,
xtick=data,
xticklabels={S1,S2,S3,S4,S5,S6,S7,S8,S9,S10},
enlarge y limits=false,
enlarge x limits=0.1,
ymin=0,ymax=100,
ybar stacked,
bar width=10pt,
legend style={
font=\footnotesize,
cells={anchor=west},
legend columns=5,
at={(0.5,-0.15)},
anchor=north,
/tikz/every even column/.append style={column sep=0.2cm}
},
% Comment from here to produce the first plot
point meta=explicit,
calculate offset/.code={
\pgfkeys{/pgf/fpu=true,/pgf/fpu/output format=fixed}
\pgfmathsetmacro\testmacro{(\pgfplotspointmeta*10^\pgfplots@data@scale@trafo@EXPONENT@y)/2*\pgfplots@y@veclength)}
\pgfkeys{/pgf/fpu=false}
},
every node near coord/.style={
/pgfplots/calculate offset,
yshift=-\testmacro
},
nodes near coords,
nodes near coords align=center
]
\addplot table [meta index=1] \datatable;
\addplot table [y=1, meta index=2] \datatable;
\addplot table [y=2, meta index=3] \datatable;
\addplot table [y=3, meta index=4] \datatable;
\addplot table [y=4, meta index=5] \datatable;
% This code produces the first plot
%\addplot table[x index=0,y index=1] \datatable;
%\addplot table[x index=0,y index=2] \datatable;
%\addplot table[x index=0,y index=3] \datatable;
%\addplot table[x index=0,y index=4] \datatable;
%\addplot table[x index=0,y index=5] \datatable;
\legend{Far,Near,Here,There,NotThere}
\end{axis}
\end{tikzpicture}
\end{document}
Best Answer
This manual solution is no longer needed
As Stefan Pinnow points out, from version 1.9 onward, PGFPlots can do this out of the box
Historical answer:
Alright, here it is! Two key things: You need to provide the
metadata explicitly by sayingmeta=<column name>in your\addplotcommands, otherwise PGFplots will use theyvalue, which is the sum of the individual values. Then, you need to convert the data value into a distance on the canvas. The formula for the label offset is<data value> * 10^<scaling exponent> / 2 * <y vector length>. Because of the large values involved in your example, this requires thefpulibrary to be activated before the calculation, and switched off afterwards.Your second example works as well if you supply the correct
y=<...>, meta=<...>options. They need to be the same, and they need to correspond to the correct column in your datatable.In the example below, I've introduced a new style
nodes near coords vertically centered, which performs the calculations and shifts the labels accordingly.The topmost segments of the S2 and S4 row do not have labels because your data adds up to slightly more than 100, so the labels are trimmed off. The easiest way to fix this is to set
ymax=100.01. Alternatively, you could make sure your data adds up to exactly 100.To hide the labels where the data is 0, you can use the
\pgfmathfloatifflags{<float to check>}{<flag>}{<action if true>}{<action if false>}macro to turn the node into a coordinate (which doesn't have a text) if the value is 0.With a couple of changes, the code can also be used for
xbarcharts: