How to draw countour integration?

Question

I would like to know how can i draw this picture in latex, and what packages are needed?

Thank your for your time.

Nothing too hard there. Pick any of the drawing tools. See here: http://tex.stackexchange.com/questions/205/what-graphics-packages-are-there-for-creating-graphics-in-latex-documents — Thruston, Apr 20 '18 at 20:52
There is tikz data visualization and pgfplots, or if you are fond of PostScript there is pstricks. Read the manuals for tutorials. — John Kormylo, Apr 20 '18 at 23:51
I´ve been trying it, but I´m too inexperienced in this tools ;/ — matemagreek, Apr 22 '18 at 11:31

score 2 · Answer 1 · answered May 24 '18 at 15:43

It's not perfect but it should work!

\documentclass[tikz, border=5pt]{standalone}


\usetikzlibrary{positioning,arrows}
\usetikzlibrary{decorations.markings}
\usetikzlibrary{calc}

\begin{document}

\def\varl{5}

\begin{tikzpicture}[
      edgearrow/.style={draw=black,
                     postaction={decorate},
                     decoration={markings,mark=at position #1 with {
                         \arrow[black,scale=.6]{triangle 45}}}},
      edgearrow/.default=.55,
      line width = .5,
      every node/.style={scale=0.6},
      scale=.5]

%% Axis
\draw[edgearrow=.9] (0,0) -- (8,0);
\draw[edgearrow=.9] (0,0) -- (0,5);

%% Dashed square
\draw[dashed] (0,0)
-- ($\varl*(60:1)$) node[anchor=south]{$\ell\tau$}
-- ($(\varl,0)+\varl*(60:1)$) node[anchor=south]{$\ell\tau+\ell$}
-- (\varl,0) node[anchor=north]{$\ell$};

%% Graduation
\foreach \x in {0,1,2}{
  \draw (\x,.2) -- (\x,0) node[anchor=north]{$\x$};
}

%% Bullets
\fill (60:1) circle (.08) node[right=.1]{$\tau$};
\fill ($2*(60:1)$) circle (.08) node[right=.1]{$2\tau$};

%% Plain square
\begin{scope}[shift={(-1,-.6)}]
  \draw[edgearrow=.8] (0,0)
                   -- node[below=.05,pos=.8]{$\sigma^*$} (\varl,0);
  \draw[edgearrow=.8] (\varl,0)
                   -- node[left=.1,pos=.8]{$g$} ($(\varl,0)+\varl*(60:1)$);
  \draw[edgearrow] ($(\varl,0)+\varl*(60:1)$)
                   -- node[below=.05]{$\sigma^*$} ($\varl*(60:1)$);
  \draw[edgearrow=.3] ($\varl*(60:1)$)
                   -- node[left=.05,pos=.2]{$g^*$} (0,0);
\end{scope}     


\end{tikzpicture}

\end{document}

which gives

By the way, I'm not sure that TeX SX is the place where you can just ask people to do the drawings for you...

How to draw countour integration?

1 Answers1