LaTeX Forum

\documentclass[a4paper,11pt]{report} %Schriftgrösse noch auf 12pt ändern.


\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage[ngerman]{babel}

\usepackage{graphicx}
\usepackage{tikz} 
\usetikzlibrary{graphs}  %Notwendig für spezielle Graphiken mit tikz

\usepackage{extarrows}
\usepackage{amssymb}

\usepackage[margin=10pt,font=small,labelfont=bf,
labelsep=endash]{caption}

\begin{document}

\begin{centering}
\begin{minipage}[t]{0.5\textwidth} 
\centering
\begin{tikzpicture} 
\coordinate[label=above:$A$] (A) at (2,3); 
\coordinate[label=below:$B$] (B) at (2,1.5); 
\coordinate[label=left:$C$] (C) at (0,0); 
\coordinate[label=right:$D$] (D) at (4,0); 
\coordinate[label=below:$b$] (b) at (2,-1.5); 
\coordinate[label=below:$c$] (c) at (0,-1.5); 
\coordinate[label=below:$d$] (d) at (4,-1.5); 
\fill (A) circle (2pt); 
\fill (B) circle (2pt); 
%\fill (C) circle (2pt); 
%\fill(D) circle (2pt); 
%\fill(b) circle (2pt); 
%\fill(c) circle (2pt); 
%\fill(d) circle (2pt); 
\draw[red][-> ,shorten >=2pt, line width=1pt] (C) -- (A); 
\draw[red][-> ,shorten >=2pt, line width=1pt] (B) -- (A); 
\draw[red][-> ,shorten >=2pt, line width=1pt] (D) -- (A); 
\draw[blue][<-> ,shorten >=2pt, line width=1pt] (B) -- (C); 
\draw[blue][<-> ,shorten >=2pt, line width=1pt] (B) -- (D); 
\draw[blue][<-> ,shorten >=2pt, line width=1pt] (C) -- (D); 
\draw[red][-> ,shorten >=11pt, line width=1pt] (b) -- (B); 
\draw[red][-> ,shorten >=2pt, line width=1pt]  (c) -- (C); 
\draw[red][-> ,shorten >=2pt, line width=1pt] (d) -- (D); 
\end{tikzpicture} 
\captionof{figure}{Netzwerk mit den Subnetzwerken c,b,d}
 \label{N3}
\end{minipage} 
\end{centering}


\end{document}

\documentclass[margin=5pt]{standalone} 
\usepackage{tikz}
\begin{document} 
\begin{tikzpicture}[
  >=latex,
  punkt/.style={circle,inner sep=1pt},
  voller punkt/.style={punkt,fill},
  linie/.style={draw, line width=1pt},
  verkuerzt/.style={shorten >=\pgflinewidth, shorten <=\pgflinewidth},
  verbindung 1/.style={linie,gray},
  verbindung 2/.style={linie,darkgray}
  ]
\path [nodes=voller punkt]
  (2,3)     node [label=above:$A$] (A) {}
  +(0,-1.5) node [label={[name=Label von B]below:$B$}] (B) {}
;
\path [nodes=punkt]
  (0,0) node [label=left:$C$]  (C) {}
  (4,0) node [label=right:$D$] (D) {}
;
\path [nodes=coordinate]
  (2,-1.5) node (b) {}
  +(-2,0)  node (c) {}
  +(2,0)   node (d) {}
;

\path [every edge/.append style={verbindung 1,verkuerzt,<-}]
  (A) edge (B)
      edge (C)
      edge (D)
;
\path[every edge/.append style={verbindung 1,->}]
  (b) edge (Label von B)
  (c) edge (C)
  (d) edge (D)
;
\path[every edge/.append style={verbindung 2,verkuerzt,<->}]
  (B) edge (C)
      edge (D)
  (C) edge (D)
;
\end{tikzpicture} 
\end{document}