[Tex/LaTex] Drawing a circle with an angle using TikZ

circlestikz-pgftikz-styles

I'm trying to re-create this picture using TikZ:

wanted

I, however, have a very limited understanding of TikZ, and, despite trying to learn how to draw this for an hour or so, have gotten nowhere on my own.

Best Answer

One (somehow verbose) option:

enter image description here

The code:

\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{angles,quotes}

\def\myrad{3cm}% radius of the circle
\def\myang{60}% angle for the arc

\begin{document}

\begin{tikzpicture}
% the origin
\coordinate (O) at (0,0);
% the circle and the dot at the origin
\draw (O) node[circle,inner sep=1.5pt,fill] {} circle [radius=\myrad];
% the ``\theta'' arc
\draw 
  (\myrad,0) coordinate (xcoord) -- 
  node[midway,below] {$r$} (O) -- 
  (\myang:\myrad) coordinate (slcoord)
  pic [draw,->,angle radius=1cm,"$\theta$"] {angle = xcoord--O--slcoord};
% the outer ``s'' arc
\draw[|-|]
  (\myrad+10pt,0)
  arc[start angle=0,end angle=\myang,radius=\myrad+10pt]
  node[midway,fill=white] {$s$};
\end{tikzpicture}

\end{document}

Improvements/Problems

Line widths are not accounted for.
Keys instead of arguments.
Keys also would allow to calculate a few things.
Recursion.
Adding missing upper and lower ring.

Code

\documentclass[tikz]{standalone}
\usetikzlibrary{paths.ortho}
\newcommand*\chainy[8]{% #1 = upper center       | #2 = lower center
                       % #3 = upper outer radius | #5 = lower outer radius
                       % #4 = upper inner radius | #6 = lower inner radius
                       % #7 = upper options      | #8 = lower options
\scope
  \clip (#1) -- ++(right:{#4}) arc[radius={#4}, start angle=0, delta angle=-90] --cycle
    ([shift=(right:{#3})] #1) coordinate (@)
    arc[radius={#3}, start angle=0, delta angle=-90] -- (#2) -- ++(right:{#5}) rl (@);
  \path[even odd rule, #8] (#2) circle [radius={#5}] (#2) circle [radius={#6}];
\endscope
\scope
  \clip (#2) -- ++(left:{#6}) arc[radius={#6}, start angle=180, delta angle=-90] --cycle
    ([shift=(left:{#5})] #2) coordinate (@)
    arc[radius={#5}, start angle=180, delta angle=-90] -- (#1) -- ++(left:{#3}) lr (@);
  \path[even odd rule, #7] (#1) circle [radius={#3}] (#1) circle [radius={#4}];
\endscope
\scope
  \clip (#1) rectangle ++ ({#3},{-#3});
  \path[even odd rule, #7] (#1) circle [radius={#3}] (#1) circle [radius={#4}];
\endscope
\scope
  \clip (#2) rectangle ++ ({-#5},{#5});
  \path[even odd rule, #8] (#2) circle [radius={#5}] (#2) circle [radius={#6}];
\endscope
}
\begin{document}
\begin{tikzpicture}[
  udlr/rl distance=+0pt, udlr/lr distance=+0pt,
  y=5mm, x=5mm, a/.style={fill=blue}, b/.style={fill=red}]
  \chainy{0,0}  {0,-9} {6}{5}{5}{4}{a}{b}
  \chainy{0,-9} {0,-16}{5}{4}{4}{3}{b}{a}
  \chainy{0,-16}{0,-21}{4}{3}{3}{2}{a}{b}
  \chainy{0,-21}{0,-24}{3}{2}{2}{1}{b}{a}
\end{tikzpicture}
\end{document}

Output

enter image description here

[Tex/LaTex] Drawing labeled intervals with specific patterns using TikZ

Here's a try.

Update: Changing the value of \bound will change the maximum number of points on each side of N. Changing the value of the x key will change the distance between adjacent points. (Thanks to @Jubobs for fueling this change)

Code

\documentclass[border=2pt]{standalone}
\usepackage{tikz,amssymb}
\usetikzlibrary{calc}

\newcommand\bound{10} % bound number of points on each side of N
\newcommand\labelnum[3][]{
\begin{scope}[font=\footnotesize,x=.3cm,#1]
  \foreach \mypt in {0,#2,...,\bound}{
    \draw(\mypt,0)circle[radius=2pt];
    \draw(-\mypt,0)circle[radius=2pt];
  }
  \draw(-\bound-5,0)--(\bound+5,0) node[pos=0,left]{$\mathbb Z$};
  \node(start)[at={(-\bound-4,0)},label=below:{$N-d$}]{$[$};
  \node(end)[at={(\bound+4,0)},label=below:{$N+d$}]{$]$};
  \node[at={($(start)!.5!(end)$)},label=below:{$N$}]{\vphantom{$[$}};
  \filldraw(0,0)circle[radius=2pt];
  \node[at={(-\bound-2,0)},above]{$\cdots$};
  \node[at={(\bound+2,0)},above]{$\cdots$};
  \node[at={(0,0)},above=5pt]{#3};
\end{scope}
}

\begin{document}
\begin{tikzpicture}
  \labelnum{1}{All integers are labeled}
  \labelnum[yshift=-2cm]{2}{Even numbers are labeled}
  \labelnum[yshift=-4cm]{5}{Multiples of 5 are labeled}
  \labelnum[yshift=-6cm]{3}{Multiples of 3 are labeled}
\end{tikzpicture}
\end{document}

Output

enter image description here

Best Answer

Related Solutions

[Tex/LaTex] Drawing chain with TikZ

Improvements/Problems

Code

Output

[Tex/LaTex] Drawing labeled intervals with specific patterns using TikZ

Code

Output

Related Question