%% 
%%  A DANTE-Edition example
%% 
%%  Example 34-02-2 on page 743.
%% 
%%  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{pst-plot,pst-slpe,animate}\SpecialCoor

\begin{document}
\newcounter{time}\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*\VAngle{45 }% starting angle
\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 \Vy #1 mul % Sx Sy
  \VHeight add 0.5 9.81 mul #1 dup mul mul sub }
\def\OneShot#1{
  \psaxes{->}(14,8)\psline[linestyle=dashed](0,\VHeight)(14,\VHeight)
  \rput(0,\VHeight){\psline[arrowscale=2]{->}(\VStart mm;\VAngle)}
  \pscircle[style=Blackball](! \SvonT{#1} ){\rBall}
  \def\VAngle{60 }
  \rput(0,\VHeight){\psline[arrowscale=2,linecolor=blue]{->}(\VStart mm;\VAngle)}
  \pscircle[style=Blueball](! \SvonT{#1} ){\rBall}\def\VAngle{75 }
  \rput(0,\VHeight){\psline[arrowscale=2,linecolor=red]{->}(\VStart mm;\VAngle)}
  \pscircle[style=Redball](! \SvonT{#1} ){\rBall}}
\begin{animateinline}[%
  width=0.9\linewidth,begin={\begin{pspicture}(-1.75,-1.25)(14.5,8.5)},
  end={\end{pspicture}},palindrome,controls,autoplay]{10}
  \multiframe{49}{nTime=0.0+1.0}{%
    \OneShot{ \nTime\space 20 div }}%
\end{animateinline}
\end{document}
