PGF/TikZ

PGF/TikZ is a powerful drawing package that can be used to produce professional-looking graphics. In particular PGF/TikZ interpreter can be used from LaTeX documents.

Links

• wikipedia:PGF/TikZ

• PGF/TikZ on CTAN
  • PGF/TikZ manual (see also pgfmanual.pdf.gz in debian package pgf)
• PGF/TikZ gallery at TeXample.net (impressive set of examples!!!)

Packages

• tkz-euclide An extremely simple and powerful drawing package for drawing geometry figures.

Reference

To be completed.

Troubleshoot

markings decoration not show in curved path

Setting a decoration at position 1 does not work when using curved paths. An easy fix is to use 0.999 instead (see also bug, [1]).

\begin{tikzpicture}[node distance=1cm,
    decoration={markings, mark=at position 0.999 with {\arrow[scale=2]{stealth}}}]
  \node (c) {C};
  \node [below=5pt of c] (d) {D};
  \draw[postaction={decorate}] (c) to [out=0,in=0,looseness=3] (d);
\end{tikzpicture}

Trouble in labels

Better enclose label text in curly braces:

% ...
\node[mult]                   (m)   [label=right:{$\rsam$}] {};
% ...
\matrix [matrix of math nodes]
{
  |(m1) [label=left:{\dagnode_1=1}]| {} \\
};

TKZ-Euclide

Quick references

TikZ options

• Placement: below, above, left, right, below left, below right, above left, above right.
• line width: thick, very thick.

Global options:

\begin{tikzpicture}[scale=1.5]            % Set drawing scale

Drawing setup and clipping:

\tkzInit[ymin=-1,ymax=5,xmin=-1,xmax=5]
\tkzClip

Define points:

\tkzDefPoint(0,0){A}                      % Absolute coordinates
\tkzDefPoint(90:2){B}                     % Polar (angle:radius) coordinates

Options for \tkzDefPoint:

\tkzDefPoint[label=above:A](80:2){A}     % Add a label to point (but can we change label style?)

Options for \tkzDrawPoints:

\tkzDrawPoints[color=black](O,A,B,C)  % Set line color
\tkzDrawPoints[fill=black](O,A,B,C)   % Set fill color
\tkzDrawPoints[size=10](O,A,B,C)      % Set point size

Options for \tkzMarkAngle:

\tkzMarkAngle[size=0.6](A,O,B)           % Set size
\tkzMarkAngle[fill=purple](A,O,B)        % Set fill
\tkzMarkAngle[opacity=0.1](A,O,B)        % Set fill opacity

Options for \tkzLabelAngle:

\tkzLabelAngle[pos=-0.4](A,C,B){$\alpha$}            %Set negative position (outwards)
\tkzLabelAngle[pos=0.5,font=\tiny](A,C,B){$\alpha$}  %Set font size

Some interesting commands:

\tkzMarkRightAngle(B,A,C)               % Mark a right angle

Examples

In this example [2],

• Clip image to a circle using \tkzClipCircle(O,Z)
• Label angles using \tkzLabelAngle[pos=0.2](B,A,C){$\alpha$}
• Label points, with positioning, using \tkzLabelPoints[below left](B)
• Change text style globally, using label style/.append style={font=\sansmath}
• Change drawing scale, using scale=3
• Draw points, with style, using \tkzDrawPoints[color=black,fill=red,size=5](A,B,C).

\begin{tikzpicture}[scale=3,label style/.append style={font=\sansmath}]
    \tkzDefPoint(0,0){O}
    \tkzDefPoint(1,0){Z}

    % Define points
    \tkzDefPoint(-0.7,-0.1){A}
    \tkzDefPoint(0.4,-0.3){B}
    \tkzDefPoint(0.1,0.4){C}

    % Draw big circle
    \tkzDrawCircle[fill=white](O,Z)

    % I have no idea what this does,
    % but when I remove it the rest of the image (the big circles)
    % get visible. So it seems to crop the image to the size of the circle
    \tkzClipCircle(O,Z)

    % Draw angles
    \tkzMarkAngles[fill= orange,size=0.3cm,opacity=.3](B,A,C)
    \tkzLabelAngle[pos=0.2](B,A,C){$\alpha$}

    \tkzMarkAngles[fill= orange,size=0.3cm,opacity=.3](C,B,A)
    \tkzLabelAngle[pos=0.2](C,B,A){$\beta$}

    \tkzMarkAngles[fill= orange,size=0.3cm,opacity=.3](A,C,B)
    \tkzLabelAngle[pos=0.2](A,C,B){$\gamma$}


    % "Clip" angles
    \tkzDrawCircle[fill,orthogonal through=A and B,color=white](O,Z)
    \tkzDrawCircle[fill,orthogonal through=A and C,color=white](O,Z)
    \tkzDrawCircle[fill,orthogonal through=B and C,color=white](O,Z)

    % Draw big circle
    \tkzDrawCircle(O,Z)

    % Draw lines
    \tkzDrawCircle[orthogonal through=A and B,color=green](O,Z)
    \tkzDrawCircle[orthogonal through=A and C,color=blue](O,Z)
    \tkzDrawCircle[orthogonal through=B and C,color=red](O,Z)

    % Draw points and label them
    \tkzDrawPoints[color=black,fill=red,size=5](A,B,C)
    \tkzLabelPoints[below](A)
    \tkzLabelPoints[below left](B)
    \tkzLabelPoints[above left](C)
\end{tikzpicture}