From 26c5d5cefe7561ea676a1f2ae9a2853695b80f3d Mon Sep 17 00:00:00 2001
From: Xu Yuan <xu@informatik.hu-berlin.de>
Date: Sat, 1 Oct 2011 21:23:26 +0200
Subject: rotate

---
 dev/demo/radius.tex    |  7 +++++--
 dev/pgf-pie-manual.tex | 24 ++++++++----------------
 dev/pgf-pie.sty        | 12 ++++++++----
 3 files changed, 21 insertions(+), 22 deletions(-)

diff --git a/dev/demo/radius.tex b/dev/demo/radius.tex
index 7860315..944e218 100644
--- a/dev/demo/radius.tex
+++ b/dev/demo/radius.tex
@@ -1,4 +1,7 @@
 \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}
+  \pie{10/, 20/, 30/, 40/}
+
+  \pie[pos={8,0}, rotate=180]{10/, 20/, 30/, 40/}
+
+  \pie[pos={17,0}, radius=4]{10/, 20/, 30/, 40/}
 \end{tikzpicture}
\ No newline at end of file
diff --git a/dev/pgf-pie-manual.tex b/dev/pgf-pie-manual.tex
index 4138749..4d19ce7 100644
--- a/dev/pgf-pie-manual.tex
+++ b/dev/pgf-pie-manual.tex
@@ -90,9 +90,12 @@ keywordstyle=\color{blue}
 \subsection{First Pie}
 \demo[0.6]{first-pie}
 
-\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\}}.
+\subsection{Position, Rotation, Size}
+
+The center of chart can be set by \texttt{pos}, default is
+\texttt{\{0,0\}}. The chart can be rotated by setting \texttt{rotate}
+(in degrees). The size of chart can be set by \texttt{radius}, default
+is 3.
 
 \demo{radius}
 
@@ -126,19 +129,8 @@ it is 100 by default. It can be calculated automatically when
 
 \section{Examples}
 
-\subsection{Population of the world}
-\example{population}
-
-% \pie{20/, 4/, 11/, 49/, 16/}
-
-% \pie{20/type A, 4/type B, 11/type C, 49/type D, 16/other}
-
-% \pie[explode={0, 0.01, 0},]{20/type A, 4/type B, 11/type C, 49/type D, 16/other}
-
-% \pie[explode={0, 0.01}, colormap=black!10]{20/type A, 4/type B,
-%   11/type C, 49/type D, 16/other}
-
-% \pie{10/, 10/, 10/, 10/, 10/, 10/, 10/, 10/, 10/, 10/ }
+% \subsection{Population of the world}
+% \example{population}
 
 % \section{Acknowledgements}
 % Many people contributed to \texttt{pgf-pie} by reporting problems,
diff --git a/dev/pgf-pie.sty b/dev/pgf-pie.sty
index bcaf112..cb982b8 100644
--- a/dev/pgf-pie.sty
+++ b/dev/pgf-pie.sty
@@ -24,7 +24,7 @@ chart by using PGF/Tikz package.]
 % #8: center
 % #9: style
 \newcommand{\pgfpie@slice}[9]{
-  \pgfmathparse{0.5*#1+0.5*#2}
+  \pgfmathparse{0.5*(#1)+0.5*(#2)}
   \let\midangle\pgfmathresult
 
   \path (#8) -- ++(\midangle:#5) coordinate(O);
@@ -39,7 +39,7 @@ chart by using PGF/Tikz package.]
   \path (O) -- ++ (\midangle:\radius) node[inner sep=0, \text=\midangle:#4]{};
 
   % inner label
-  \pgfmathparse{min((#2-#1-10)/110*(-0.3),0)}
+  \pgfmathparse{min(((#2)-(#1)-10)/110*(-0.3),0)}
   \let\temp\pgfmathresult
   \pgfmathparse{(max(\temp,-0.5) + 0.8)*#7}
   \let\innerpos\pgfmathresult
@@ -78,6 +78,9 @@ chart by using PGF/Tikz package.]
 \def\setsum#1\pgfeov{\xdef\sum{#1}}
 \pgfkeyslet{/sum/.@cmd}{\setsum}
 
+\def\setrotate#1\pgfeov{\xdef\rotate{#1}}
+\pgfkeyslet{/rotate/.@cmd}{\setrotate}
+
 \newcommand{\pie}[2][]
 {
   \pgfkeys{
@@ -90,6 +93,7 @@ chart by using PGF/Tikz package.]
     after number=\%,
     text=label,
     sum=100,
+    rotate=0,
   }
   \pgfkeys{#1}
 
@@ -139,8 +143,8 @@ chart by using PGF/Tikz package.]
       \fi
     }
 
-    \pgfpie@slice{\thepgfpie@angleBegin/\sum*360}
-    {\thepgfpie@angleEnd/\sum*360}
+    \pgfpie@slice{\thepgfpie@angleBegin/\sum*360+\rotate}
+    {\thepgfpie@angleEnd/\sum*360+\rotate}
     {\beforenumber \p \afternumber}
     {\t}
     {\theexplode}
-- 
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