added my TikZ examples

tikz/doubly-linked-list/doubly-linked-list.tex

@@ -0,0 +1,51 @@
+\documentclass{article}
+\usepackage[pdftex,active,tightpage]{preview}
+\setlength\PreviewBorder{2mm}
+ 
+\usepackage{tikz}
+\usetikzlibrary{calc,shapes.multipart,chains,arrows,positioning}
+
+\tikzset{
+    squarecross/.style={
+        draw, rectangle,minimum size=18pt, fill=orange!80,
+        inner sep=0pt, text=black,
+        path picture = {
+            \draw[black]
+            (path picture bounding box.north west) -- 
+            (path picture bounding box.south east)
+            (path picture bounding box.south west) -- 
+            (path picture bounding box.north east);
+        }
+    }
+}
+
+\begin{document}
+\begin{preview}
+\begin{tikzpicture}[
+        list/.style={
+            very thick, rectangle split, 
+            rectangle split parts=3, draw, 
+            rectangle split horizontal, minimum size=18pt,
+            inner sep=5pt, text=black,
+            rectangle split part fill={blue!20, red!20, blue!20}
+        }, 
+        ->, start chain, very thick
+      ]
+
+  \node[list,on chain] (A) {\nodepart{second} 12};
+  \node[list,on chain] (B) {\nodepart{second} 99};
+  \node[list,on chain] (C) {\nodepart{second} 37};
+
+  \node[squarecross]   (D) [right=of C] {};
+  \node[squarecross]   (E) [left= of A] {};
+
+  \path[*->] let \p1 = (A.three), \p2 = (A.center) in (\x1,\y2) edge [bend left] ($(B.one)+(0,0.2)$);
+  \path[*->] let \p1 = (B.three), \p2 = (B.center) in (\x1,\y2) edge [bend left] ($(C.one)+(0,0.2)$);
+  \draw[*->] let \p1 = (C.three), \p2 = (C.center) in (\x1,\y2) -- (D);
+
+  \draw[*->] ($(A.one)+(0.2,0.1)$) -- (E);
+  \path[*->] ($(B.one)+(0.1,0.1)$) edge [bend left] ($(A.three)+(0,-0.05)$);
+  \path[*->] ($(C.one)+(0.1,0.1)$) edge [bend left] ($(B.three)+(0,-0.05)$);
+\end{tikzpicture}
+\end{preview}
+\end{document}