From cac24b96a2690e8b2bc0f7cb4f55a53f9cc38579 Mon Sep 17 00:00:00 2001
From: Xu Yuan <xu@informatik.hu-berlin.de>
Date: Sun, 2 Oct 2011 00:12:43 +0200
Subject: legend

---
 dev/demo/legend.tex    |  3 +++
 dev/demo/polar.tex     |  3 +++
 dev/pgf-pie-manual.tex |  6 ++++--
 dev/pgf-pie.sty        | 47 ++++++++++++++++++++++++++++++++++++++---------
 4 files changed, 48 insertions(+), 11 deletions(-)
 create mode 100644 dev/demo/legend.tex
 create mode 100644 dev/demo/polar.tex

diff --git a/dev/demo/legend.tex b/dev/demo/legend.tex
new file mode 100644
index 0000000..f6665f6
--- /dev/null
+++ b/dev/demo/legend.tex
@@ -0,0 +1,3 @@
+\begin{tikzpicture}
+  \pie[text=legend]{10/First, 20/Second, 30/Third, 40/Fourth}
+\end{tikzpicture}
\ No newline at end of file
diff --git a/dev/demo/polar.tex b/dev/demo/polar.tex
new file mode 100644
index 0000000..4d86872
--- /dev/null
+++ b/dev/demo/polar.tex
@@ -0,0 +1,3 @@
+\begin{tikzpicture}
+  \pie[polar]{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 6eb7809..95a666f 100644
--- a/dev/pgf-pie-manual.tex
+++ b/dev/pgf-pie-manual.tex
@@ -115,11 +115,13 @@ is 3.
 \demo[0.6]{before-after-number}
 
 \subsubsection{Text outside pie}
-The value of \texttt{text} can be \texttt{label}(default) or
-\texttt{pin}.
+The value of \texttt{text} can be \texttt{label}(default),
+\texttt{pin} or \texttt{legend}.
 
 \demo[0.6]{text}
 
+\demo[0.6]{legend}
+
 \subsection{Sum}
 The value of \texttt{sum} indicats the sum of all data in the chart,
 it is 100 by default. It can be calculated automatically when
diff --git a/dev/pgf-pie.sty b/dev/pgf-pie.sty
index 84cbb1c..e26c4fb 100644
--- a/dev/pgf-pie.sty
+++ b/dev/pgf-pie.sty
@@ -36,7 +36,11 @@ chart by using PGF/Tikz package.]
   \draw[line join=round, fill=#6, #9] (O) -- ++(#1:#7) arc (#1:#2:#7) -- cycle;
 
   % outer label
-  \path (O) -- ++ (\midangle:\radius) node[inner sep=0, \text=\midangle:#4]{};
+  \iflegend
+  \else
+    \path (O) -- ++ (\midangle:\radius)
+    node[inner sep=0, \text=\midangle:#4]{};
+  \fi
 
   % inner label
   \pgfmathparse{min(((#2)-(#1)-10)/110*(-0.3),0)}
@@ -46,6 +50,19 @@ chart by using PGF/Tikz package.]
   \path (O) -- ++(\midangle:\innerpos) node {#3};
 }
 
+\newcommand{\pgfpie@findColor}[1]
+{
+  \pgfmathparse{int(mod(#1,\value{pgfpie@colorLength}))}
+  \let\ci\pgfmathresult
+  \foreach \c [count=\j from 0] in \color {
+    \ifnum \j=\ci
+    \xdef\thecolor{\c}
+    \thecolor
+    \breakforeach
+    \fi
+  }
+}
+
 \newcounter{pgfpie@angleBegin}
 \newcounter{pgfpie@angleEnd}
 \newcounter{pgfpie@explodeLength}
@@ -85,6 +102,8 @@ chart by using PGF/Tikz package.]
 \newif\ifpolar
 \pgfkeys{/polar/.is if=polar}
 
+\newif\iflegend
+
 \newcommand{\pie}[2][]
 {
   % load default parameters
@@ -106,6 +125,11 @@ chart by using PGF/Tikz package.]
   % load user's parameters
   \pgfkeys{#1}
 
+  % legend or not
+  \ifthenelse{\equal{\text}{legend}}
+  {\legendtrue}
+  {\legendfalse}
+
   % handle sum
   \ifthenelse{\equal{\sum}{auto}}
   {
@@ -169,14 +193,7 @@ chart by using PGF/Tikz package.]
     }
 
     % find color
-    \pgfmathparse{int(mod(\i,\value{pgfpie@colorLength}))}
-    \let\ci\pgfmathresult
-    \foreach \c [count=\j from 0] in \color {
-      \ifnum \j=\ci
-      \xdef\thecolor{\c}
-      \breakforeach
-      \fi
-    }
+    \pgfpie@findColor{\i}
 
     \pgfpie@slice{\thepgfpie@angleBegin/\sum*360+\rotate}
     {\thepgfpie@angleEnd/\sum*360+\rotate}
@@ -188,6 +205,18 @@ chart by using PGF/Tikz package.]
     {\pos}
     {\style}
   }
+
+  % legend
+  \iflegend
+    \coordinate[xshift=0.8cm] (legendpos) at (current bounding box.north east);
+    \begin{scope}[node distance=0.5cm]
+    \foreach \p/\t  [count=\i from 0] in {#2}
+    {
+      \pgfpie@findColor{\i}
+      \node[draw, fill=\thecolor, \style, below of=legendpos, label=0:\t] (legendpos) {};
+    }
+    \end{scope}
+  \fi
 }
 
 %%% End of pgf-pie.sty
-- 
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