[pstricks] draw animation by tikZ

[Herbert Voss]

Alexander Grahn schrieb:
> 
> Looks great, Herbert! With the doubled number of frames the animation
> is much smoother. However, to see the difference you should increase
> the FPS setting in the PSTricks example to 24 instead of reducing it.

thanks Alexander,
you're right. Here is a modfied version, which also fills the
area under the curve.

Herbert

\documentclass{article}
\usepackage{animate}
\usepackage{pstricks-add}
\usepackage{multido}
\begin{document}
  %-------------------- write timeline file ---------------------%
  \newwrite\TimeLineFile
  \immediate\openout\TimeLineFile=sinus.txt
  \immediate\write\TimeLineFile{::0x0,1}%
  %remaining frames: overlay filled circle at its current postion
  \multido{\i=2+1}{90}{%
    \immediate\write\TimeLineFile{%
      ::\i % put filled circle on top
  }}
  \immediate\closeout\TimeLineFile
  %------------------- assemble animation -----------------------%
  \psset{xunit=\pstRadUnit}
  \begin{animateinline}[controls,timeline=sinus.txt,
    begin={\begin{pspicture}(-0.5,-1.5)(6.6,2)},
    end={\end{pspicture}}]{24}
    %---- static material: axes, labels, curve ----%

\psaxes[trigLabels,trigLabelBase=3]{->}(0,0)(-2mm,-1.5)(6.5,1.5)[t,-90][$y=\sin(t)$,0]
    \psplot[xunit=1cm,linestyle=dashed,algebraic]{0}{\psPiTwo}{sin(x)}
    \newframe
    \multiframe{91}{n=0+4}{\psset{xunit=1cm,linecolor=blue}
      \pscustom[xunit=1cm,fillcolor=blue!30,fillstyle=solid,
        linestyle=none,algebraic,dimen=inner]{%
        \psplot{0}{\n\space DegtoRad}{sin(x)}
        \psline(!\n\space DegtoRad 0)
      }
      \psplot[xunit=1cm,linestyle=dashed,linecolor=black,
         algebraic]{0}{\n\space DegtoRad}{sin(x)}
      \psdot[opacity=0.4,dotsize=3mm](!\n\space dup DegtoRad exch sin)
      \psline[linestyle=dashed](!\n\space dup DegtoRad exch
sin)(!\n\space DegtoRad 0)
    }
  \end{animateinline}
\end{document}