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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}
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