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-%%
-%% A DANTE-Edition example
-%%
-%% Example 14-05-1 on page 164.
-%%
-%% 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{415.41023pt}
-\setlength\parindent{0pt}
-
-\usepackage{pst-node,multido,pst-xkey}
-\SpecialCoor
-\makeatletter
-\define@boolkey[psset]{}[Pst@]{showFP}[true]{}% mark focal point?
-\psset{showFP=true} % default
-\def\focalPoint{\pst@object{focalPoint}}
-\def\focalPoint@i(#1)(#2)(#3)#4{{ % keep everything local
- \use@par% % set parameters
- \pst@getcoor{#1}\pst@tempA% point A % get coordinates as x y
- \pst@getcoor{#2}\pst@tempB% point B %
- \pst@getcoor{#3}\pst@tempC% point C %
- \pnode(! % set nodes
- \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
- ){#4}% % #5 = node name
- \ifPst@showFP\qdisk(#4){2pt}\fi}%
- \ignorespaces} % mark?
-\makeatother
-
-\begin{document}
-\psset{unit=0.7}
-\begin{pspicture}(-5,-5)(5,5)
- \multido{\rA=-5+0.5,\rB=0+0.5,\rC=5+-0.5}{10}{%
- \pnode(-5,\rA){A}\pnode(\rB,5){B}\pnode(\rC,-5){C}%
- \pspolygon[linecolor=blue](A)(B)(C)%
- \focalPoint(A)(B)(C){SP}%
- }
- \multido{\rA=0+0.5,\rB=5+-0.5,\rC=0+-0.5}{10}{%
- \pnode(-5,\rA){A}\pnode(5,\rB){B}\pnode(\rC,-5){C}%
- \pspolygon[linecolor=red](A)(B)(C)%
- \focalPoint(A)(B)(C){SP}%
- }
- \multido{\rA=-5+0.5,\rB=0+-0.5,\rC=-5+0.5}{10}{%
- \pnode(\rA,5){A}\pnode(5,\rB){B}\pnode(-5,\rC){C}%
- \pspolygon[linecolor=cyan](A)(B)(C)%
- \focalPoint(A)(B)(C){SP}%
- }
- \multido{\rA=0+0.5,\rB=5+-0.5,\rC=0+0.5}{10}{%
- \pnode(\rA,5){A}\pnode(\rB,-5){B}\pnode(-5,\rC){C}%
- \pspolygon[linecolor=magenta](A)(B)(C)%
- \focalPoint(A)(B)(C){SP}%
- }
- \multido{\rA=5+-0.5,\rB=0+-0.5,\rC=-5+0.5}{10}{%
- \pnode(5,\rA){A}\pnode(\rB,-5){B}\pnode(\rC,5){C}%
- \pspolygon[linecolor=blue](A)(B)(C)%
- \focalPoint(A)(B)(C){SP}%
- }
- \multido{\rA=0+-0.5,\rB=-5+0.5,\rC=0+0.5}{10}{%
- \pnode(5,\rA){A}\pnode(-5,\rB){B}\pnode(\rC,5){C}%
- \pspolygon[linecolor=red](A)(B)(C)%
- \focalPoint(A)(B)(C){SP}%
- }
- \multido{\rA=5+-0.5,\rB=0+0.5,\rC=5+-0.5}{10}{%
- \pnode(\rA,-5){A}\pnode(-5,\rB){B}\pnode(5,\rC){C}%
- \pspolygon[linecolor=cyan](A)(B)(C)%
- \focalPoint(A)(B)(C){SP}%
- }
- \multido{\rA=0+-0.5,\rB=-5+0.5,\rC=0+-0.5}{10}{%
- \pnode(\rA,-5){A}\pnode(\rB,5){B}\pnode(5,\rC){C}%
- \pspolygon[linecolor=magenta](A)(B)(C)%
- \focalPoint(A)(B)(C){SP}%
- }
-\end{pspicture}
-\end{document}