TikZ Diagrams

What’s inside

• Starter files
• main.texopens first · 5.5 KB

  \documentclass[11pt]{article}
  
  \usepackage[margin=1in]{geometry}
  \usepackage{amsmath,amssymb}
  \usepackage{tikz}
  \usetikzlibrary{arrows.meta,positioning,shapes.geometric,calc,angles,quotes}
  \usepackage{tikz-cd}
  \usepackage{pgfplots}
  \pgfplotsset{compat=1.18}
  \usepackage[hidelinks]{hyperref}
  
  % Shared node styles: change these once and every flowchart follows.
  \tikzset{
    box/.style={draw, rounded corners, minimum width=2.4cm, minimum height=0.9cm, align=center},
    decision/.style={draw, diamond, aspect=2, inner sep=1pt, align=center},
    arrow/.style={-{Latex[length=2.5mm]}, thick},
  }
  
  \title{Diagrams in \LaTeX: Five Worked Examples}
  \author{Your Name}
  \date{}
  
  \begin{document}
  
  \maketitle
  
  \noindent Every figure below is drawn in the source, so it compiles anywhere
  with no image files. Double-click a figure in the PDF to jump to the code
  that draws it, copy the block you want, and change the labels.
  
  \section{Flowchart}
  
  Nodes are placed relative to each other with the \texttt{positioning}
  library, so adding a step never means recomputing coordinates.
  
  \begin{figure}[ht]
    \centering
    \begin{tikzpicture}[node distance=1.1cm and 1.6cm]
      \node[box] (start) {Collect data};
      \node[box, right=of start] (clean) {Clean and\\normalize};
      \node[decision, right=of clean] (check) {Enough\\samples?};
      \node[box, right=of check] (fit) {Fit model};
      \node[box, below=of check] (more) {Gather more};
      \draw[arrow] (start) -- (clean);
      \draw[arrow] (clean) -- (check);
      \draw[arrow] (check) -- node[above] {yes} (fit);
      \draw[arrow] (check) -- node[right] {no} (more);
      \draw[arrow] (more) -| (start);
    \end{tikzpicture}
    \caption{A pipeline with one decision and a loop back to the start.}
    \label{fig:flowchart}
  \end{figure}
  
  \section{Commutative diagram}
  
  The \texttt{tikz-cd} package lays out a diagram as a matrix: cells are
  separated by \texttt{\&}, rows by \verb|\\|, and arrows name the direction
  they point (\texttt{r}ight, \texttt{d}own, \texttt{l}eft, \texttt{u}p).
  
  \begin{figure}[ht]
    \centering
    \begin{tikzcd}[row sep=large, column sep=large]
      P \arrow[r, "p_1"] \arrow[d, "p_2"'] \arrow[dr, phantom, "\lrcorner", very near start]
        & X \arrow[d, "f"] \\
      Y \arrow[r, "g"'] & Z
    \end{tikzcd}
    \qquad
    \begin{tikzcd}[column sep=large]
      A \arrow[r, "\varphi"] \arrow[dr, "\psi \circ \varphi"', dashed] & B \arrow[d, "\psi"] \\
      & C
    \end{tikzcd}
    \caption{A pullback square (left) and a composition triangle (right).}
    \label{fig:cd}
  \end{figure}
  
  \section{Tree and graph}
  
  A tree is one nested \texttt{child} expression. A graph on a circle is a
  \texttt{foreach} loop over vertex positions, with edges listed by index.
  
  \begin{figure}[ht]
    \centering
    \begin{tikzpicture}[level distance=1.1cm, sibling distance=1.6cm,
        every node/.style={draw, circle, minimum size=7mm, inner sep=1pt}]
      \node {8}
        child {node {3}
          child {node {1}}
          child {node {6}}}
        child {node {10}
          child[missing]
          child {node {14}}};
    \end{tikzpicture}
    \qquad\qquad
    \begin{tikzpicture}[every node/.style={draw, circle, fill=white, minimum size=6mm, inner sep=1pt}]
      \foreach \i in {1,...,6}
        \node (v\i) at ({360/6 * (\i - 1) + 90}:1.5cm) {$v_\i$};
      \foreach \a/\b in {1/2, 2/3, 3/4, 4/5, 5/6, 6/1, 1/4, 2/5}
        \draw[thick] (v\a) -- (v\b);
    \end{tikzpicture}
    \caption{A binary search tree (left) and a hexagon with two chords (right).}
    \label{fig:graph}
  \end{figure}
  
  \section{Function plot}
  
  \texttt{pgfplots} draws axes, ticks and a legend for you. Functions are
  sampled from an expression; measured data goes in a \texttt{coordinates}
  list or a \texttt{table}.
  
  \begin{figure}[ht]
    \centering
    \begin{tikzpicture}
      \begin{axis}[
          width=0.75\linewidth, height=6cm,
          xlabel={$x$}, ylabel={$y$},
          domain=0:2*pi, samples=100,
          xtick={0, 1.5708, 3.1416, 4.7124, 6.2832},
          xticklabels={$0$, $\pi/2$, $\pi$, $3\pi/2$, $2\pi$},
          grid=major, legend pos=south west]
        \addplot[thick] {sin(deg(x))};
        \addplot[thick, dashed] {cos(deg(x))};
        \addplot[only marks, mark=*] coordinates {(0.5,0.47) (1.5,1.02) (2.5,0.58) (3.5,-0.38)};
        \legend{$\sin x$, $\cos x$, data}
      \end{axis}
    \end{tikzpicture}
    \caption{Two sampled curves and four measured points on one axis.}
    \label{fig:plot}
  \end{figure}
  
  \section{Geometry}
  
  Named coordinates keep a figure readable, and the \texttt{angles} library
  draws angle marks from three points.
  
  \begin{figure}[ht]
    \centering
    \begin{tikzpicture}[scale=1.2]
      \coordinate[label=below left:$A$] (A) at (0,0);
      \coordinate[label=below right:$B$] (B) at (4,0);
      \coordinate[label=above:$C$] (C) at (4,2.5);
      \draw[thick] (A) -- (B) -- (C) -- cycle;
      \draw pic[draw, angle radius=7mm, "$\theta$", angle eccentricity=1.4] {angle = B--A--C};
      \draw pic[draw] {right angle = A--B--C};
      \node[below] at ($(A)!0.5!(B)$) {$b$};
      \node[right] at ($(B)!0.5!(C)$) {$a$};
      \node[above left] at ($(A)!0.5!(C)$) {$c$};
      \draw[dashed] (B) circle (2.5);
    \end{tikzpicture}
    \caption{A right triangle with a marked angle, side labels and a circle through $C$.}
    \label{fig:geometry}
  \end{figure}
  
  \section{Adapting these}
  
  Figures~\ref{fig:flowchart} to~\ref{fig:geometry} share the styles declared
  in the preamble, so a new look is one edit in \verb|\tikzset|. To add a
  diagram, copy the closest example, rename its labels, and recompile. Or
  describe the picture you want in the chat beside this document and ask for
  it to be drawn here.
  
  \end{document}
  

• Libraries and docs
• main.pdfprebuilt · 140 KBReplaced by the first recompile.

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• main.synctex.gzprebuilt · 14 KBReplaced by the first recompile.

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