[Tex/LaTex] Drawing simple graph pattern with Tikz

tikz-pgf

I've been using LaTeX since three years, but I've always avoided the Tikz package for drawing. Now I am writing my degree thesis and I'm forced to use it to achieve a better result. The problem is just I don't have time right now to start a deep walkthrough.

I have to draw these simple patterns of graphs: a triangle and a complete bipartite graph (see pictures below). I found the sample code of a simple triangle graph on the web and I tried to rearrange nodes using relative positioning, but the result was not quite good. This is my attempt.

\begin{tikzpicture}[->,>=stealth',shorten >=1pt,auto,node distance=3cm,
        thick,main node/.style={circle,fill=blue!20,draw,minimum size=1cm,inner sep=0pt]}]

    \node[main node] (1) {$1$};
    \node[main node] (2) [below left of=1]  {$2$};
    \node[main node] (3) [below right of=1] {$3$};

    \path[-]
    (1) edge node {} (2)
        edge node {} (3)
    (2) edge node {} (1)
        edge node {} (3)
    (3) edge node {} (1)
        edge node {} (2);
\end{tikzpicture}

Could you please give me any help to improve this result?

Thank you.

Graph pattern

Best Answer

_{Well, we answer many questions with "Do it for me!" Why not this one!}

TikZ mafia here won't forgive people having no time to learn tikz;). The code you got from elsewhere makes wrong use of below of. This is how it is used with positioning library.

\documentclass[tikz,border=10pt]{standalone}
\usetikzlibrary{positioning}
\tikzset{main node/.style={circle,fill=blue!20,draw,minimum size=1cm,inner sep=0pt},
            }
\begin{document}
  \begin{tikzpicture}
    \node[main node] (1) {$1$};
    \node[main node] (2) [below left = 2.3cm and 1.5cm of 1]  {$2$};
    \node[main node] (3) [below right = 2.3cm and 1.5cm of 1] {$3$};

    \path[draw,thick]
    (1) edge node {} (2)
    (2) edge node {} (3)
    (3) edge node {} (1);
    %%
    \begin{scope}[xshift=4cm]
    \node[main node] (1) {$1$};
    \node[main node] (2) [right = 2cm  of 1]  {$2$};
    \node[main node] (3) [below = 2cm  of 1] {$3$};
    \node[main node] (4) [right = 2cm  of 3] {$4$};

    \path[draw,thick]
    (1) edge node {} (2)
    (1) edge node {} (4)
    (3) edge node {} (2)
    (3) edge node {} (4)
    ;
    \end{scope}
\end{tikzpicture}
\end{document}

enter image description here

Related Solutions

[Tex/LaTex] How to define the default vertical distance between nodes

I don't really get the question so I hope this is what you wanted. If you include a full document (such that we copy paste and see the problem on our systems) things are much more easier.

Here, you can change the default setting within a scope but your block style had a node distance which was resetting every time it is issued. I've made it 2mm such that we can see the difference easier.

\documentclass[tikz]{standalone}
\usetikzlibrary{arrows,shapes.geometric,positioning}

\begin{document}
\begin{tikzpicture}[decision/.style={diamond, draw, text width=4.5em, text badly centered, node distance=3.5cm, inner sep=0pt},
                    block/.style   ={rectangle, draw, text width=6em, text centered, rounded corners, minimum height=4em, minimum height=2em},
                    cloud/.style   ={draw, ellipse, minimum height=2em},
                    line/.style    ={draw,-latex'},
                    node distance = 1cm, 
                    auto]
    \node [block] (1st) {1st};
    \node [block, right= of 1st]  (2nd1) {2nd1};
\begin{scope}[node distance=2mm and 10mm]%Here we change it for everything inside this scope
    \node [block, above= of 2nd1] (2nd2) {2nd2};
    \node [block, below= of 2nd1] (2nd3) {2nd3};
    \node [block, right= of 2nd1] (3rd1) {3rd1};
    \node [block, above= of 3rd1] (3rd2) {3rd2};
    \node [block, above= of 3rd2] (3rd3) {3rd3};
\end{scope}
    \node [block, below= of 3rd1] (3rd4) {3rd4};
    \node [block, below= of 3rd4] (3rd5) {3rd5};

    \path [line] (1st) -- (2nd1);
    \path [line] (2nd1) -- (2nd2);
    \path [line] (2nd1) -- (2nd3);
    \path [line] (2nd2) -- (3rd3);
    \path [line] (2nd1) -- (3rd1);
    \path [line] (1st) -- (2nd1);
\end{tikzpicture}
\end{document}

enter image description here

Document header with tikz

\documentclass[tikz,border=2pt]{standalone}
\usetikzlibrary{chains, positioning, shapes.symbols}
\usepackage{xcolor}
\definecolor{darkblue}{RGB}{9,72,90}
\definecolor{lightblue}{RGB}{124,184,201}

\begin{document}
\begin{tikzpicture}[
    node distance = 2pt,
    start chain = going right,
    start/.style = {signal, 
                    draw=darkblue, 
                    fill=lightblue,
                    text width=2cm, 
                    minimum height=1cm, 
                    font=\scriptsize,
                    text=white,
                    signal pointer angle=120, on chain},
    cont/.style = {start, 
                    signal from=west}
    ]
    
    \node[start,](a) {\bfseries Construction de l'image};
    \node[above=0.6cm of a.west, anchor=south west,
            rectangle, 
            draw=darkblue, 
            fill=darkblue,
            minimum height=2cm,
            minimum width=13cm,
            text=white,
            inner sep=1pt]
            (titre){\large{La photographie numérique}};
    \node[cont] {\bfseries Métadonnées EXIF};
    \node[cont](b) {\bfseries Step3};
    \node[right=5.4cm of titre.north east, anchor=north east,
            rectangle,
            draw=darkblue,
            fill=darkblue,thick,
            rounded corners,
            minimum height=3cm,
            text width=5cm,
            text=white]
            (competences){Identifier les étapes de la construction de l'image finale};
\end{tikzpicture}
\end{document}

Best Answer

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[Tex/LaTex] How to define the default vertical distance between nodes

Document header with tikz

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