1segment orientation -1 2\documentclass[tikz]{standalone} 3 4\usepackage{pgflibraryshapes} 5\usetikzlibrary{backgrounds} 6\usetikzlibrary{arrows} 7\begin{document} 8\begin{tikzpicture}[scale = 1.,font=\fontsize{8}{8}\selectfont] 9\path (0.) node(2_0) [draw,shape=circle,color=gray] {2}; 10\path (2.) node(3_0) [draw,shape=circle,color=gray] {3}; 11\path (-2.) node(4_0) [draw,shape=circle,color=gray] {4}; 12\draw[color=gray] (4_0) -- (2_0); 13\draw[color=gray] (2_0) -- (3_0); 14\path (-1.) node(0_0) [] {}; 15\path (1.) node(1_0) [] {}; 16\end{tikzpicture} 17\end{document} 18segment orientation 0 19\documentclass[tikz]{standalone} 20 21\usepackage{pgflibraryshapes} 22\usetikzlibrary{backgrounds} 23\usetikzlibrary{arrows} 24\begin{document} 25\begin{tikzpicture}[scale = 1.,font=\fontsize{8}{8}\selectfont] 26\path (0.) node(2_0) [draw,shape=circle,color=gray] {2}; 27\path (-2.) node(3_0) [draw,shape=circle,color=gray] {3}; 28\path (2.) node(4_0) [draw,shape=circle,color=gray] {4}; 29\draw[color=gray] (3_0) -- (2_0); 30\draw[color=gray] (2_0) -- (4_0); 31\path (-1.) node(0_0) [] {}; 32\path (1.) node(1_0) [] {}; 33\end{tikzpicture} 34\end{document} 35