What Can You Create with TikZ Code Examples?

[MarkFL]

I thought it would be nice to begin a thread where we can post examples of TikZ code that the community can use as templates or jumping off points for their own images. I would recommend not posting a huge number of images in the same post, so we don't strain the rendering server (maintained by I like Serena), or MHB's server.

I'll begin with a Sudoku 3D cube:

\begin{tikzpicture}[every node/.style={minimum size=1cm},on grid]
%preamble \usetikzlibrary{positioning}
\begin{scope}[every node/.append style={yslant=-0.5},yslant=-0.5]
\shade[right color=gray!10, left color=black!50] (0,0) rectangle +(3,3);
\node at (0.5,2.5) {9};
\node at (1.5,2.5) {7};
\node at (2.5,2.5) {1};
\node at (0.5,1.5) {2};
\node at (1.5,1.5) {4};
\node at (2.5,1.5) {8};
\node at (0.5,0.5) {5};
\node at (1.5,0.5) {3};
\node at (2.5,0.5) {6};
\draw (0,0) grid (3,3);
\end{scope}
\begin{scope}[every node/.append style={yslant=0.5},yslant=0.5]
\shade[right color=gray!70,left color=gray!10] (3,-3) rectangle +(3,3);
\node at (3.5,-0.5) {3};
\node at (4.5,-0.5) {9};
\node at (5.5,-0.5) {7};
\node at (3.5,-1.5) {6};
\node at (4.5,-1.5) {1};
\node at (5.5,-1.5) {5};
\node at (3.5,-2.5) {8};
\node at (4.5,-2.5) {2};
\node at (5.5,-2.5) {4};
\draw (3,-3) grid (6,0);
\end{scope}
\begin{scope}[every node/.append style={
yslant=0.5,xslant=-1},yslant=0.5,xslant=-1
]
\shade[bottom color=gray!10, top color=black!80] (6,3) rectangle +(-3,-3);
\node at (3.5,2.5) {1};
\node at (3.5,1.5) {4};
\node at (3.5,0.5) {7};
\node at (4.5,2.5) {5};
\node at (4.5,1.5) {6};
\node at (4.5,0.5) {8};
\node at (5.5,2.5) {2};
\node at (5.5,1.5) {3};
\node at (5.5,0.5) {9};
\draw (3,0) grid (6,3);
\end{scope}
\end{tikzpicture}

And a belt and pulley system:

\begin{tikzpicture}

% Definitions
\pgfmathsetmacro{\b}{75}
\pgfmathsetmacro{\a}{15}
\pgfmathsetmacro{\R}{2}
\pgfmathsetmacro{\r}{1}
\pgfmathsetmacro{\P}{\R*tan(\b)}
\pgfmathsetmacro{\Q}{\R/cos(\b)}
\pgfmathsetmacro{\p}{\r/tan(\a)}
\pgfmathsetmacro{\q}{\r/sin(\a)}

% Pulleys

% Big pulley
\draw (0,0) circle (\R) ;
\fill[left color=gray!80, right color=gray!60, middle
color=white] (0,0) circle (\R) ;
\draw[thick, white] (0,0) circle (.8*\R);
\shade[ball color=white] (0,0) circle (.3) node[left,xshift=-5] {$P$};

% small pulley
\draw (\Q+\q-.3, 0) circle (\r);
\fill[left color=gray!80, right color=gray!60, middle
color=white] (\Q+\q-.3, 0) circle (\r) ;
\draw[thick, white] (\Q+\q-.3,0) circle (.8*\r);
\shade[ball color=white] (\Q+\q-.3,0) circle (.15)
node[right, xshift=2] {$Q$};

% belt and point labels
\begin{scope}[ultra thick]
\draw (\b:\R) arc (\b:360-\b:\R) ;
\draw (\b:\R) -- ( \P, 0 );
\draw (-\b:\R) -- ( \P, 0 );
\draw (\Q-.3,0) -- + (\a:\p) arc (105:-105:\r) ;
\draw (\Q-.3,0) -- + (-\a:\p);
%\draw (\b:\R) arc (\b:360-\b:\r) ;
\end{scope}

\draw (0,0) -- (\b:\R) node[midway, above,sloped] {$R$} node[above] {$A$};
\draw (-\b:\R)--(0,0) ;
\draw (\Q+\q-.3,0) -- +(105:\r) node[midway,above, sloped] {$r$}
node[above] {$E$};
\draw (\Q+\q-.3,0) -- +(-105:\r) node[below] {$D$};
\node[below] at (-\b:\R) {$B$};
\node[below] at (\Q-.3,0) {$C$};

% center line
\draw[dash pattern=on5pt off3pt] (0,0) -- (\Q+\q-.3,0);

% angle label
\node[fill=white] at (0.73*\Q, 0) {$\theta$} ;
\draw (\Q-1.8,0) arc (180:195:1.5);
\draw (\Q-1.8,0) arc (180:165:1.5);
\end{tikzpicture}

 

[MarkFL]

Escher Brick:

\begin{tikzpicture}[scale=4.5, line join=bevel]
% \a and \b are two macros defining characteristic
% dimensions of the impossible brick.
\pgfmathsetmacro{\a}{0.18}
\pgfmathsetmacro{\b}{1.37}

\tikzset{%
apply style/.code={\tikzset{#1}},
brick_edges/.style={thick,draw=black},
face_coloura/.style={fill=gray!50},
face_colourb/.style={fill=gray!25},
face_colourc/.style={fill=gray!90},
}

\foreach \theta/\v/\facestyleone/\facestyletwo in {%
0/0/{brick_edges,face_coloura}/{brick_edges,face_colourc},
180/-\a/{brick_edges,face_colourb}/{brick_edges,face_colourc}
}{
\begin{scope}[rotate=\theta,shift={(\v,0)}]
\draw[apply style/.expand once=\facestyleone]
({-.5*\b},{1.5*\a}) --
++(\b,0) --
++(-\a,-\a) --
++({-\b+2*\a},0) --
++(0,-{2*\a}) --
++(\b,0) --
++(-\a,-\a) --
++(-\b,0) --
cycle;
\draw[apply style/.expand once=\facestyletwo]
({.5*\b},{1.5*\a}) --
++(0,{-2*\a}) --
++(-\a,0) --
++(0,\a) --
cycle;
\end{scope}
}
\end{tikzpicture}

Penrose Triangle:

\begin{tikzpicture}[scale=1, line join=bevel]

% \a and \b are two macros defining characteristic
% dimensions of the Penrose triangle.
\pgfmathsetmacro{\a}{2.5}
\pgfmathsetmacro{\b}{0.9}

\tikzset{%
apply style/.code = {\tikzset{#1}},
triangle_edges/.style = {thick,draw=black}
}

\foreach \theta/\facestyle in {%
0/{triangle_edges, fill = gray!50},
120/{triangle_edges, fill = gray!25},
240/{triangle_edges, fill = gray!90}%
}{
\begin{scope}[rotate=\theta]
\draw[apply style/.expand once=\facestyle]
({-sqrt(3)/2*\a},{-0.5*\a}) --
++(-\b,0) --
({0.5*\b},{\a+3*sqrt(3)/2*\b}) -- % higher point
({sqrt(3)/2*\a+2.5*\b},{-.5*\a-sqrt(3)/2*\b}) -- % rightmost point
++({-.5*\b},-{sqrt(3)/2*\b}) -- % lower point
({0.5*\b},{\a+sqrt(3)/2*\b}) --
cycle;
\end{scope}
}
\end{tikzpicture}

 

[MarkFL]

The electric dipole moment (p) in the water molecule

\begin{tikzpicture}[>=latex,scale=1.3]
\shade[ball color=gray!10!] (0,0) coordinate(Hp) circle (.9) ;
\shade[ball color=gray!10!] (2,-1.53) coordinate(O) circle (1.62) ;
\shade[ball color=gray!10!] (4,0) coordinate(Hm) circle (.9) ;
\draw[thick,dashed] (0,0) -- (2,-1.53) -- (4,0) ;
\draw[thick] (2,.2) -- (2,1.5) node

{$\mathbf{p}$} ;
\draw (2.48,-1.2) arc (33:142:.6) ;
\draw (2,-.95) node[above]{$105^{\circ}$} ;
\draw (0,.2) node

{H$^+$} ;
\draw (4,.2) node

{H$^-$} ;
\draw (2,-1.63) node[below]{O$^{2-}$} ;
\foreach \point in {O,Hp,Hm}
\fill [black] (\point) circle (2pt) ;
\end{tikzpicture}​

 

[MarkFL]

Parallel lines and related angles

\begin{tikzpicture}
\draw[fill=yellow] (0,0) -- (60:.75cm) arc (60:180:.75cm);
\draw(120:0.4cm) node {$\alpha$};

\draw[fill=green!30] (0,0) -- (right:.75cm) arc (0:60:.75cm);
\draw(30:0.5cm) node {$\beta$};

\begin{scope}[shift={(60:2cm)}]
\draw[fill=green!30] (0,0) -- (180:.75cm) arc (180:240:.75cm);
\draw (30:-0.5cm) node {$\gamma$};

\draw[fill=yellow] (0,0) -- (240:.75cm) arc (240:360:.75cm);
\draw (-60:0.4cm) node {$\delta$};
\end{scope}

\begin{scope}[thick]
\draw (60:-1cm) node[fill=white] {$E$} -- (60:3cm) node[fill=white] {$F$};
\draw[red] (-2,0) node

{$A$} -- (3,0)
node

{$B$};
\draw[blue,shift={(60:2cm)}] (-3,0) node

{$C$} -- (2,0)
node

{$D$};
\draw[shift={(60:1cm)},xshift=4cm]
node [right,text width=6cm,rounded corners,fill=red!20,inner sep=1ex]
{
When we assume that $\color{red}AB$ and $\color{blue}CD$ are
parallel, I.\,e., ${\color{red}AB} \mathbin{\|} \color{blue}CD$,
then $\alpha = \delta$ and $\beta = \gamma$.
};
\end{scope}
\end{tikzpicture}

Intersection of

\begin{tikzpicture}
%preamble \usetikzlibrary{arrows}
[
scale=5,
axis/.style={very thick, ->, >=stealth'},
important line/.style={thick},
dashed line/.style={dashed, thin},
pile/.style={thick, ->, >=stealth', shorten <=2pt, shorten
>=2pt},
every node/.style={color=black}
]
% axis
\draw[axis] (-0.1,0) -- (1.1,0) node(xline)

{$G\uparrow/T\downarrow$};
\draw[axis] (0,-0.1) -- (0,1.1) node(yline)[above] {$E$};
% Lines
\draw[important line] (.15,.15) coordinate (A) -- (.85,.85)
coordinate (B) node[right, text width=5em] {$Y^O$};
\draw[important line] (.15,.85) coordinate (C) -- (.85,.15)
coordinate (D) node[right, text width=5em] {$\mathit{NX}=x$};
% Intersection of lines
\fill[red] (intersection cs:
first line={(A) -- (B)},
second line={(C) -- (D)}) coordinate (E) circle (.4pt)
node[above,] {$A$};
% The E point is placed more or less randomly
\fill[red] (E) +(-.075cm,-.2cm) coordinate (out) circle (.4pt)
node[below left] {$B$};
% Line connecting out and ext balances
\draw [pile] (out) -- (intersection of A--B and out--[shift={(0:1pt)}]out)
coordinate (extbal);
\fill[red] (extbal) circle (.4pt) node[above] {$C$};
% line connecting out and int balances
\draw [pile] (out) -- (intersection of C--D and out--[shift={(0:1pt)}]out)
coordinate (intbal);
\fill[red] (intbal) circle (.4pt) node[above] {$D$};
% line between out og all balanced out :)
\draw[pile] (out) -- (E);
\end{tikzpicture}

Intersecting lines

\begin{tikzpicture}[scale=1.5]
% Draw axes
\draw [<->,thick] (0,2) node (yaxis) [above] {$y$}
|- (3,0) node (xaxis)

{$x$};
% Draw two intersecting lines
\draw (0,0) coordinate (a_1) -- (2,1.8) coordinate (a_2);
\draw (0,1.5) coordinate (b_1) -- (2.5,0) coordinate (b_2);
% Calculate the intersection of the lines a_1 -- a_2 and b_1 -- b_2
% and store the coordinate in c.
\coordinate (c) at (intersection of a_1--a_2 and b_1--b_2);
% Draw lines indicating intersection with y and x axis. Here we use
% the perpendicular coordinate system
\draw[dashed] (yaxis |- c) node

{$y'$}
-| (xaxis -| c) node[below] {$x'$};
% Draw a dot to indicate intersection point
\fill[red] (c) circle (2pt);
\end{tikzpicture}​