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%%
%% A DANTE-Edition example
%%
%% Example 36-00-91 on page 806.
%%
%% Copyright (C) 2011 Herbert Voss
%%
%% 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.
%%
%%
%% ====
% Show page(s) 1
%%
\documentclass[]{article}
\pagestyle{empty}
\setlength\textwidth{201.70511pt}
\setlength\parindent{0pt}
\usepackage{pstricks,pst-optic}
\makeatletter
\def\pstriangleA{\pst@object{pstriangleA}}
\def\pstriangleA@i(#1)(#2)(#3)(#4)(#5)(#6){{%
\use@par
\psline(#1)(#2)\psline(#3)(#4)\psline(#5)(#6)
\ABinterCD(#1)(#2)(#3)(#4){A}
\ABinterCD(#1)(#2)(#5)(#6){B}
\ABinterCD(#5)(#6)(#3)(#4){C}
\pspolygon(A)(B)(C)
}}
\makeatother
\begin{document}
\begin{pspicture}(7,7)
\psaxes{->}(6,6)
\pstriangleA[fillstyle=solid,fillcolor=red]%
(1.98,2.38)(1.98,5)(1.98,3.8)(-1,3.8)(1,4)(4,0.8)
\pstriangleA[fillstyle=solid,fillcolor=blue!30!red!20]%
(0,0)(6,4)(1,5)(5,1)(2,0)(3,6)
\end{pspicture}
\end{document}
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