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I'm trying to have an animated tikz graph with floating point values. While I can use floating point values as parameters for the graph, I can't seem to find a way to do so for displayed equations. Below is a MWE using beamer. The green line is animated properly - but the parameter does not appear in simplified form. The blue line shows the parameter appearing the way I would like it to (as a simplified number) but it is not updated in the tikz picture, even though it is updated outside that picture.





\newcommand{\scalevalues}{ %

\scaled % will print 0.1 above picture

\begin{animateinline}[loop, poster = first, controls, palindrome]{10}
\whiledo{\thestep < 21}{
    %\useasboundingbox (-1,-1) rectangle (5,5);
    \draw[->] (-1,0) -- (5,0) node[anchor=west]{\color{gray}x};
    \draw[->] (0,-1) -- (0,5) node[anchor=south]{\color{gray}y};
    \draw[-, thick, blue] (\scaled,-1) -- (5,4) node[anchor=east]{$\scaled x $};
    \draw[-, thick, green] (0.1*\thestep,-1) -- (2,3) node[anchor=east]{$0.1*\thestep x $};
    \scaled % will print updated values below picture
    \ifthenelse{\thestep < 21}{

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1 Answer

up vote 3 down vote accepted

You have to carry out the calculation somehow but TikZ don't quite get that it's a computation it has to perform. So you can make it obvious by

{$\pgfmathparse{0.1*\thestep}\pgfmathprintnumber[fixed,precision=1]\pgfmathresult x $}

in that node.

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Wow, that was fast! Thanks... I have to wait a few minutes until I can accept it. –  André Oct 6 '12 at 21:11
@André No rush. Maybe someone else comes along with a better answer :) –  percusse Oct 6 '12 at 21:11
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