In the label of a 2D donut pie chart with pgf-plot how can I bring the label to the second line if its a long label?
Basically, I am referring to 2D ring diagram and would like to add the labels in two lines (I have big labels)
I am quite new to LaTeX and unable to change it. can anyone help me in doing this. I would highly appreciate it.
I would add align=... to the text nodes and then add line breaks (\\) to the text.
\documentclass[border=5pt]{standalone}
\usepackage{tikz}
\usetikzlibrary{arrows}
% Adjusts the size of the wheel:
\def\innerradius{1.8cm}
\def\outerradius{2.2cm}
% The main macro
\newcommand{\wheelchart}[1]{
% Calculate total
\pgfmathsetmacro{\totalnum}{0}
\foreach \value/\colour/\name in {#1} {
\pgfmathparse{\value+\totalnum}
\global\let\totalnum=\pgfmathresult
}
\begin{tikzpicture}
% Calculate the thickness and the middle line of the wheel
\pgfmathsetmacro{\wheelwidth}{\outerradius-\innerradius}
\pgfmathsetmacro{\midradius}{(\outerradius+\innerradius)/2}
% Rotate so we start from the top
\begin{scope}[
rotate=90,
]
% Loop through each value set. \cumnum keeps track of where we are in the wheel
\pgfmathsetmacro{\cumnum}{0}
\foreach \value/\colour/\name in {#1} {
\pgfmathsetmacro{\newcumnum}{\cumnum + \value/\totalnum*360}
% Calculate the percent value
\pgfmathsetmacro{\percentage}{\value/\totalnum*100}
% Calculate the mid angle of the colour segments to place the labels
\pgfmathsetmacro{\midangle}{-(\cumnum+\newcumnum)/2}
% This is necessary for the labels to align nicely
\pgfmathparse{
(-\midangle<180?"west":"east")
} \edef\textanchor{\pgfmathresult}
\pgfmathsetmacro\labelshiftdir{1-2*(-\midangle>180)}
% Draw the color segments. Somehow, the \midrow units got lost, so we add 'pt' at the end. Not nice...
\fill [\colour] (-\cumnum:\outerradius) arc (-\cumnum:-(\newcumnum):\outerradius)
-- (-\newcumnum:\innerradius)
arc (-\newcumnum:-(\cumnum):\innerradius)
-- cycle
;
% Draw the data labels
\draw [*-,thin] node [
append after command={
(\midangle:\midradius pt)
-- (\midangle:\outerradius + 1ex)
-- (\tikzlastnode)
}
] at (\midangle:\outerradius + 1ex) [
xshift=\labelshiftdir*0.5cm,
% inner sep=0pt, % <-- commented
outer sep=0pt,
anchor=\textanchor,
% ---------------------------------------------------------
% add `align=...' and add linebreaks (`\\') to the text
align=left,
% ---------------------------------------------------------
] {\name: \pgfmathprintnumber{\percentage}\%};
% Set the old cumulated angle to the new value
\global\let\cumnum=\newcumnum
}
\end{scope}
% \draw[gray] (0,0) circle (\outerradius) circle (\innerradius);
\end{tikzpicture}
}
\begin{document}
% Usage: \wheelchart{<value1>/<colour1>/<label1>, ...}
\wheelchart{
26/cyan/Corporate,
28/orange/This is a very long label \\ that is wrapped over more \\ than one line,
33.5/yellow/Chimique,
12.5/blue!50!red/Rhodia%
}
\end{document}
The perhaps simplest option is to add text width to the options of the respective nodes.
\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{arrows}
\begin{document}
% Adjusts the size of the wheel:
\def\innerradius{1.8cm}
\def\outerradius{2.2cm}
% The main macro
\newcommand{\wheelchart}[1]{
% Calculate total
\pgfmathsetmacro{\totalnum}{0}
\foreach \value/\colour/\name in {#1} {
\pgfmathparse{\value+\totalnum}
\global\let\totalnum=\pgfmathresult
}
\begin{tikzpicture}
% Calculate the thickness and the middle line of the wheel
\pgfmathsetmacro{\wheelwidth}{\outerradius-\innerradius}
\pgfmathsetmacro{\midradius}{(\outerradius+\innerradius)/2}
% Rotate so we start from the top
\begin{scope}[rotate=90]
% Loop through each value set. \cumnum keeps track of where we are in the wheel
\pgfmathsetmacro{\cumnum}{0}
\foreach \value/\colour/\name in {#1} {
\pgfmathsetmacro{\newcumnum}{\cumnum + \value/\totalnum*360}
% Calculate the percent value
\pgfmathsetmacro{\percentage}{\value/\totalnum*100}
% Calculate the mid angle of the colour segments to place the labels
\pgfmathsetmacro{\midangle}{-(\cumnum+\newcumnum)/2}
% This is necessary for the labels to align nicely
\pgfmathparse{
(-\midangle<180?"west":"east")
} \edef\textanchor{\pgfmathresult}
\pgfmathsetmacro\labelshiftdir{1-2*(-\midangle>180)}
% Draw the color segments. Somehow, the \midrow units got lost, so we add 'pt' at the end. Not nice...
\fill[\colour] (-\cumnum:\outerradius) arc (-\cumnum:-(\newcumnum):\outerradius) --
(-\newcumnum:\innerradius) arc (-\newcumnum:-(\cumnum):\innerradius) -- cycle;
% Draw the data labels
\draw [*-,thin] node [append after command={(\midangle:\midradius
pt) -- (\midangle:\outerradius + 1ex) --
(\tikzlastnode)}] at (\midangle:\outerradius + 1ex)
[xshift=\labelshiftdir*0.5cm,inner sep=0pt, outer sep=0pt,
text width=3cm, %<-added
anchor=\textanchor]{\name: \pgfmathprintnumber{\percentage}\%};
% Set the old cumulated angle to the new value
\global\let\cumnum=\newcumnum
}
\end{scope}
% \draw[gray] (0,0) circle (\outerradius) circle (\innerradius);
\end{tikzpicture}
}
% Usage: \wheelchart{<value1>/<colour1>/<label1>, ...}
\wheelchart{26/cyan/Corporate bla bla bla, 28/orange/Plastique, 33.5/yellow/Chimique, 12.5/blue!50!red/Rhodia}
\end{document}
The wheelchart package, which I wrote, can be used.
Multiple lines in the data can be achieved by using \\ for a line break.
The percentages are automatically computed and can be used with \WCperc.
\documentclass[border=6pt]{standalone}
\usepackage{wheelchart}
\usetikzlibrary{decorations.markings}
\begin{document}
\begin{tikzpicture}
\wheelchart[
data=\WCvarC: \WCperc,
lines=0.4,
lines ext=0.5,
lines ext left anchor=east,
lines ext right anchor=west,
lines sep=-0.2,
lines style={
postaction=decorate,
decoration={
markings,
mark=at position 0 with {
\fill (0,0) circle[radius=0.1];
}
}
},
perc precision=1,
radius={1.8}{2.2},
]{%
26/cyan/Corporate\\and a\\long text,
28/orange/Plastique\\and another\\long text,
33.5/yellow/Chimique\\and a\\short text,
12.5/blue!50!red/Rhodia%
}
\end{tikzpicture}
\end{document}
