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-%%
-%% A DANTE-Edition example
-%%
-%% Example 14-04-1 on page 161.
-%%
-%% 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-node} \SpecialCoor
-\makeatletter
-\define@boolkey[psset]{}[Pst@]{showFP}[true]{}% mark focal point?
-\psset{showFP} % true as default
-\def\focalPoint{\@ifnextchar[{\focalPoint@i}{\focalPoint@i[]}}
-\def\focalPoint@i[#1](#2)(#3)(#4)#5{{ % everything stays local
- \psset{#1} % set parameters
- \pst@getcoor{#2}\pst@tempA% point A % get coordinates as x y
- \pst@getcoor{#3}\pst@tempB% point B %
- \pst@getcoor{#4}\pst@tempC% point C %
- \pnode(! % set node
- \pst@tempA /YA exch \pst@number\psyunit div def
- /XA exch \pst@number\psxunit div def % x y in user coordinates
- \pst@tempB /YB exch \pst@number\psyunit div def
- /XB exch \pst@number\psxunit div def
- \pst@tempC /YC exch \pst@number\psyunit div def
- /XC exch \pst@number\psxunit div def
- XA XB XC add add 3.0 div % xSP
- YA YB YC add add 3.0 div % ySP
- ){#5} % #5 = node name
- \ifPst@showFP\qdisk(#5){2pt}\fi}\ignorespaces}
-\makeatother
-
-\begin{document}
-\begin{pspicture}[showgrid](4,4) \psset{linewidth=2pt}
- \pspolygon[linecolor=red](0,0)(2,4)(4,0)%
- \focalPoint[showFP=true,linecolor=red](0,0)(2,4)(4,0){SP1}%
- \pnode(0,0){A}\pnode(0,4){B}\pnode(4,2){C}%
- \pspolygon[linecolor=blue](A)(B)(C)\focalPoint(A)(B)(C){SP2}%
- {\psset{linecolor=blue}\qdisk(SP2){2pt}}
- \ncline[linewidth=0.2pt]{<->}{SP1}{SP2}%
-\end{pspicture}
-\end{document}