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+%%
+%% A DANTE-Edition example
+%%
+%% Example 34-02-1 on page 742.
+%%
+%% Copyright (C) 2010 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{375.57637pt}
+\setlength\parindent{0pt}
+
+\usepackage{graphicx,pst-slpe,pstricks-add}
+\newpsstyle{magenta40}{fillstyle=solid,fillcolor=magenta!40}
+\newpsstyle{blue40}{fillstyle=solid,fillcolor=blue!60}
+\newpsstyle{Blackball}{fillstyle=ccslope,slopebegin=white,slopeend=black,
+ slopecenter={0.6 0.6}}
+\newpsstyle{Blueball}{fillstyle=ccslope,slopebegin=white,slopeend=blue,
+ slopecenter={0.6 0.6}}
+\newpsstyle{Redball}{fillstyle=ccslope,slopebegin=white,slopeend=red,
+ slopecenter={0.6 0.6}}
+% inclined plane
+\newcommand*\VStart{10 }% starting speed in angle direction
+\newcommand*\VHeight{2 }% starting height
+\def\Vx{\VStart \VAngle cos mul }
+\def\Vy{\VStart \VAngle sin mul }
+\newcommand*\rBall{0.25 }
+\newcommand*\mass{1 }
+
+\def\SvonT#1{ % way as function of time, returns x y
+ \Vx #1 mul % Sx
+ \Vy #1 mul \VHeight add 0.5 9.81 mul #1 dup mul mul sub } % Sy
+
+\def\OneShot#1{
+ \def\VAngle{45 }
+ \pscircle[style=Blackball](! \SvonT{#1} ){\rBall}
+ \def\VAngle{60 }
+ \pscircle[style=Blueball](! \SvonT{#1} ){\rBall}
+ \def\VAngle{75 }
+ \pscircle[style=Redball](! \SvonT{#1} ){\rBall}}
+
+\def\Axes{
+ \psaxes{->}(14,8)
+ \def\VAngle{45 }
+ \psline[linestyle=dashed](0,\VHeight)(14,\VHeight)
+ \rput(0,\VHeight){\psline[arrowscale=2]{->}(\VStart mm;\VAngle)}
+ \def\VAngle{60 }
+ \rput(0,\VHeight){\psline[arrowscale=2,linecolor=blue]{->}(\VStart mm;\VAngle)}
+ \def\VAngle{75 }
+ \rput(0,\VHeight){\psline[arrowscale=2,linecolor=red]{->}(\VStart mm;\VAngle)}}
+
+
+\begin{document}
+\begin{center}
+\resizebox{0.9\linewidth}{!}{%
+ \begin{pspicture}(-1.25,-1.25)(14.5,8.5)%
+ \multido{\rTime=0.0+1.0}{30}{%
+ \OneShot{ \rTime\space 20 div }%
+ }%
+ \Axes%
+ \end{pspicture}%
+ }%
+
+\medskip
+\includegraphics[height=1.44em]{figures/buttons}
+\end{center}
+\end{document}