LaTeX TikZ template

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\documentclass[11pt,a4paper]{article}

\usepackage[T1]{fontenc}
\usepackage[margin=25mm]{geometry}
\usepackage{lmodern}
% [H] below keeps each figure where it is written instead of letting it float.
\usepackage{float}
\usepackage{tikz}
\usetikzlibrary{arrows.meta,positioning,shapes.geometric,calc,angles,quotes}
\usepackage{pgfplots}
\pgfplotsset{compat=1.18}

% Three lines to change: title, author, date.
\title{Figures Drawn in the Source}
\author{Your Name}
\date{\today}

\begin{document}
\maketitle

\section{Introduction}
Every figure in this document is written as TikZ source next to the text it
belongs to, so it uses the same fonts and the same math as the body and there
is no image file to keep in sync. Figure~\ref{fig:shapes} shows the basic
vocabulary, Figure~\ref{fig:geometry} two constructions computed by TeX,
Figure~\ref{fig:flowchart} a diagram built from named nodes, and
Figure~\ref{fig:plot} a chart drawn by \texttt{pgfplots}. Copy the one closest
to what you need and change the numbers.

\section{Shapes and paths}
Coordinates, straight lines, rectangles, circles and B\'ezier curves are the
vocabulary. The options in square brackets set colour, line width, fill and
arrow tips.

\begin{figure}[H]
\centering
\begin{tikzpicture}
% The grid and the axes. Change (4,2.5) to grow the canvas.
\draw[help lines, step=0.5] (0,0) grid (4,2.2);
\draw[->, thick] (0,0) -- (4.4,0) node[right] {$x$};
\draw[->, thick] (0,0) -- (0,2.6) node[above] {$y$};
% A colour such as blue!15 is 15 percent blue mixed with white.
\draw[fill=blue!15, draw=blue!60!black, thick] (0.5,0.5) rectangle (1.75,1.75);
\draw[fill=orange!30, draw=orange!70!black, thick] (2.6,1.25) circle (0.7);
\draw[red, very thick, dashed] (0.5,1.9) .. controls (1.5,2.7) and (2.5,0.8) .. (3.8,2.0);
\draw[-{Stealth[length=3mm]}, green!50!black, thick] (3.5,0.4) -- (1.95,1.15);
\end{tikzpicture}
\caption{A rectangle, a circle, a B\'ezier curve and an arrow on a grid.}
\label{fig:shapes}
\end{figure}

\section{Constructions computed by TeX}
\verb|\foreach| repeats a drawing command over a list, and the math engine
evaluates the coordinates: seven points on a circle and every chord between
them take four lines of source. Named coordinates, polar coordinates such as
\texttt{(40:1)} and the perpendicular syntax \texttt{(P |- O)} keep a
construction exact without computing a single number by hand; the
\texttt{angles} and \texttt{quotes} libraries draw and label the angle.

\begin{figure}[H]
\centering
\begin{minipage}{0.42\linewidth}
\centering
\begin{tikzpicture}
% Change both 7s to draw the complete graph on another number of points.
\foreach \i in {1,...,7} {
  \coordinate (p\i) at ({90+360/7*(\i-1)}:1.5);
}
\foreach \i [evaluate=\i as \next using int(\i+1)] in {1,...,6}
  \foreach \j in {\next,...,7}
    \draw[blue!45, thin] (p\i) -- (p\j);
\foreach \i in {1,...,7}
  \fill[blue!60!black] (p\i) circle (2pt);
\end{tikzpicture}
\end{minipage}
\hfill
\begin{minipage}{0.54\linewidth}
\centering
\begin{tikzpicture}[scale=1.4]
\draw[->] (-1.2,0) -- (1.35,0) node[right] {$x$};
\draw[->] (0,-1.2) -- (0,1.35) node[above] {$y$};
\draw[thick] (0,0) circle (1);
\coordinate (O) at (0,0);
\coordinate (X) at (1,0);
% The angle: 40 degrees, radius 1.
\coordinate (P) at (40:1);
\draw[thick, blue] (O) -- (P) node[above right] {$(\cos\theta,\sin\theta)$};
\draw[dashed, red] (P) -- (P |- O) node[below] {$\cos\theta$};
\draw[dashed, red] (P) -- (P -| O) node[left] {$\sin\theta$};
\pic[draw, ->, "$\theta$", angle eccentricity=1.4, angle radius=5mm] {angle=X--O--P};
\fill[blue] (P) circle (0.6pt);
\end{tikzpicture}
\end{minipage}
\caption{Left: the complete graph on seven points. Right: sine and cosine on
the unit circle.}
\label{fig:geometry}
\end{figure}

\section{A flowchart}
A node is a shape with text inside, and the \texttt{positioning} library
places nodes relative to each other. The styles defined at the top of the
picture keep every box alike, and the arrows connect nodes by name, so moving
one box moves its arrows with it.

\begin{figure}[H]
\centering
\begin{tikzpicture}[node distance=7mm and 12mm, font=\small,
  box/.style={draw, rounded corners, fill=blue!8, minimum width=26mm,
    minimum height=8mm, align=center},
  decision/.style={diamond, draw, fill=orange!15, aspect=2, inner sep=1pt},
  arrow/.style={-{Stealth[length=2.5mm]}, thick}]
% One line per box: the text in braces, the name in parentheses.
\node[box] (edit) {Edit \texttt{main.tex}};
\node[box, below=of edit] (compile) {Compile};
\node[decision, below=of compile] (errors) {Errors?};
\node[box, right=of errors] (fix) {Read the log,\\fix the line};
\node[box, below=of errors] (pdf) {Download the PDF};
% One line per arrow, from name to name; a node[...] in between labels it.
\draw[arrow] (edit) -- (compile);
\draw[arrow] (compile) -- (errors);
\draw[arrow] (errors) -- node[above] {yes} (fix);
\draw[arrow] (fix) |- (edit);
\draw[arrow] (errors) -- node[right] {no} (pdf);
\end{tikzpicture}
\caption{The edit, compile and fix loop as a flowchart.}
\label{fig:flowchart}
\end{figure}

\section{A plot}
\texttt{pgfplots} builds on TikZ and draws the axes, ticks, grid and legend
from a function or from a list of numbers. The curves in
Figure~\ref{fig:plot} are evaluated by TeX at compile time.

\begin{figure}[H]
\centering
\begin{tikzpicture}
\begin{axis}[width=0.85\linewidth, height=58mm, domain=0:4*pi, samples=200,
  xlabel={$x$}, ylabel={$y$}, grid=major, legend pos=north east,
  xtick={0,3.1416,6.2832,9.4248,12.566},
  xticklabels={$0$,$\pi$,$2\pi$,$3\pi$,$4\pi$}]
% One \addplot per curve. Angles are in degrees, hence deg(x).
\addplot[blue, thick] {sin(deg(x))};
\addplot[red, thick] {exp(-0.25*x)*cos(deg(x))};
% One legend entry per \addplot, in the same order.
\legend{$\sin x$, $e^{-x/4}\cos x$}
\end{axis}
\end{tikzpicture}
\caption{Two functions on one axis, with a grid and a legend.}
\label{fig:plot}
\end{figure}

\end{document}