%% %% The LaTeX Graphics Companion, 2ed (first printing May 2007) %% %% Example 6-2-3 on page 336. %% %% Copyright (C) 2007 Michel Goossens, Frank Mittelbach, Denis Roegel, Sebastian Rahtz, Herbert Vo\ss %% %% It may be distributed and/or modified under the conditions %% of the LaTeX Project Public License, either version 1.3 %% of this license or (at your option) any later version. %% %% See http://www.latex-project.org/lppl.txt for details. %% \documentclass{ttctexa} \pagestyle{empty} \setcounter{page}{6} \setlength\textwidth{207.83385pt} \StartShownPreambleCommands \usepackage{pstricks,pst-node} \SpecialCoor \newcommand\DefNodes[2]{% \rnode[tl]{#1-tl}{% \rnode[tr]{#1-tr}{% \rnode[bl]{#1-bl}{% \rnode[br]{#1-br}{#2}}}}} \StopShownPreambleCommands \begin{document} \huge$\frac{\DefNodes{A}{A_1}+\DefNodes{B}{B_1}+C_1} {\DefNodes{D}{D_1}+\DefNodes{E}{E_1}+\DefNodes{F}{F_1}}$ \psccurve[linecolor=blue,linestyle=dashed,% fillstyle=hlines,hatchcolor=black!20] (D-bl)(A-tl)(A-tr)([angle=-90,nodesep=0.1]B-bl) ([angle=-90,nodesep=0.1]B-br)(F-tr)(F-br)(F-bl) ([angle=90,nodesep=0.1]E-tr)([angle=90,nodesep=0.1]E-tl) (D-br)(D-bl) \end{document}