From 59dd623790d8f70db0a340c71f9c27a2e3903b0c Mon Sep 17 00:00:00 2001
From: Xu Yuan <xu@informatik.hu-berlin.de>
Date: Sat, 1 Oct 2011 12:56:51 +0200
Subject: pos and radius

---
 dev/demo/radius.tex    |  4 ++++
 dev/pgf-pie-manual.tex | 44 ++++++++++++++++++++++++++++----------------
 dev/pgf-pie.sty        | 21 +++++++++++++++------
 3 files changed, 47 insertions(+), 22 deletions(-)
 create mode 100644 dev/demo/radius.tex

diff --git a/dev/demo/radius.tex b/dev/demo/radius.tex
new file mode 100644
index 0000000..7860315
--- /dev/null
+++ b/dev/demo/radius.tex
@@ -0,0 +1,4 @@
+\begin{tikzpicture}
+  \pie{10/A, 20/B, 30/C, 40/D}
+  \pie[pos={10,0}, radius=4]{10/A, 20/B, 30/C, 40/D}
+\end{tikzpicture}
\ No newline at end of file
diff --git a/dev/pgf-pie-manual.tex b/dev/pgf-pie-manual.tex
index 12e91d2..85f07d1 100644
--- a/dev/pgf-pie-manual.tex
+++ b/dev/pgf-pie-manual.tex
@@ -37,27 +37,33 @@ keywordstyle=\color{blue}
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 \newcommand{\demo}[2][1]{
-\begin{minipage}{.49\linewidth}
-\centering
-\resizebox{#1\linewidth}{!}{
-\input{demo/#2}
-}
-\end{minipage}
-\hspace{0.01\linewidth}
-\begin{minipage}{.5\linewidth}
-\lstinputlisting{demo/#2}
-\end{minipage}
+  \begin{center}
+  \begin{tabular}{cc}
+    \begin{minipage}{.49\linewidth}
+      \centering
+      \resizebox{#1\linewidth}{!}{
+        \input{demo/#2}
+      }
+    \end{minipage}
+    &
+    \begin{minipage}{.45\linewidth}
+      \lstinputlisting{demo/#2}
+    \end{minipage}
+  \end{tabular}
+  \end{center}
 }
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-\newcommand{\example}[1]{
-\resizebox{\linewidth}{!}{
-\input{demo/#1}
-}
-\lstinputlisting{demo/#1}
+\newcommand{\example}[2][1]{
+  \begin{center}  
+    \resizebox{#1\linewidth}{!}{
+      \input{demo/#2}
+    }
+  \end{center}
+  \lstinputlisting{demo/#2}
 }
-%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 
 
 \begin{document}
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
@@ -89,6 +95,12 @@ keywordstyle=\color{blue}
 \subsection{Color}
 \demo[0.6]{color}
 
+\subsection{Radius, Position}
+The size of chart can be set by \texttt{radius}, default is 3. The
+center of chart can be set by \texttt{pos}, default is \texttt{\{0,0\}}.
+
+\demo{radius}
+
 \section{Examples}
 
 
diff --git a/dev/pgf-pie.sty b/dev/pgf-pie.sty
index 84e543e..896ce73 100644
--- a/dev/pgf-pie.sty
+++ b/dev/pgf-pie.sty
@@ -21,22 +21,24 @@ chart by using PGF/Tikz package.]
 % #5: explode
 % #6: fill color
 % #7: radius
-\newcommand{\pgfpie@slice}[7]{
+% #8: center
+\newcommand{\pgfpie@slice}[8]{
   \pgfmathparse{0.5*#1+0.5*#2}
   \let\midangle\pgfmathresult
 
+  \path (#8) -- ++(\midangle:#5) coordinate(O);
   % slice
-  \draw[thick,fill=#6] (\midangle:#5) -- ++(#1:#7) arc (#1:#2:#7) -- cycle;
+  \draw[thick,fill=#6] (O) -- ++(#1:#7) arc (#1:#2:#7) -- cycle;
 
   % outer label
-  \node[label=\midangle:#4] at (\midangle:#7) {};
+  \path (O) -- ++ (\midangle:#7) node[label=\midangle:#4]{};
 
   % inner label
   \pgfmathparse{min((#2-#1-10)/110*(-0.3),0)}
   \let\temp\pgfmathresult
   \pgfmathparse{(max(\temp,-0.5) + 0.8)*#7}
   \let\innerpos\pgfmathresult
-  \node at (\midangle:\innerpos) {#3};
+  \path (O) -- ++(\midangle:\innerpos) node {#3};
 }
 
 \newcounter{pgfpie@angleBegin}
@@ -53,11 +55,17 @@ chart by using PGF/Tikz package.]
 \def\setradius#1\pgfeov{\def\radius{#1}}
 \pgfkeyslet{/radius/.@cmd}{\setradius}
 
+\def\setpos#1\pgfeov{\def\pos{#1}}
+\pgfkeyslet{/pos/.@cmd}{\setpos}
+
 \newcommand{\pie}[2][]
 {
-  \pgfkeys{explode=0,
+  \pgfkeys{
+    explode=0,
     colormap={blue!60, cyan!60, yellow!60, orange!60, red!60},
-    radius=3}
+    radius=3,
+    pos={0,0}
+  }
   \pgfkeys{#1}
 
   \def\explodearray{{\explode}}
@@ -95,6 +103,7 @@ chart by using PGF/Tikz package.]
       {\e}
       {\thecolor}
       {\radius}
+      {\pos}
     }
 }
 
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