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how to add an arrow and explanation to each term in an equation in beamer

\newrgbcolor{lila}{0.6 0.2 0.5}
\newrgbcolor{darkyellow}{1 0.9 0}
Die Bindungsenergie im Tröpfchenmodell setzt sich aus
folgenden Teilen zusammen:
\item dem \rnode{b}{Oberflächenanteil}
\item Dem \rnode{a}{Volumenanteil},\\[1cm]
E =
\rnode[t]{ae}{\psframebox*[fillcolor=darkyellow,linestyle=none]{\xstrut a_vA}} +
\rnode[t]{be}{\psframebox*[fillcolor=lightgray,linestyle=none]{\xstrut -a_fA^{2/3}}} +
\rnode[t]{ce}{\psframebox*[fillcolor=green,linestyle=none]{\xstrut -a_c\frac{Z(Z-1)}{A^{1/3}}}} +
\rnode[t]{de}{\psframebox*[fillcolor=cyan,linestyle=none]{\xstrut -a_s\frac{(A-2Z)^2}{A}}} +
\rnode[t]{ee}{\psframebox*[fillcolor=yellow,linestyle=none]{\xstrut E_p}}
\item dem \rnode{c}{Coulomb-Anteil}
\item der \rnode{d}{Symmetrieenergie}
\item sowie einem \rnode{e}{Paarbildungsbeitrag}.

this is the output of node5.tex


share|improve this question
Hi, welcome to TeX.SE. A few more sentences in your question will help you get the answers that you're looking for. Have you tried anything? What engine (apparently not pdflatex. xelatex?) and packages (tikz? pstricks?) are you using besides beamer? – Matthew Leingang Apr 13 '11 at 9:49
i'm not using any packages.don't know which package to use – user4852 Apr 13 '11 at 10:14

How to use TikZ with beamer to explain terms in equations

share|improve this answer
works with pdflatex only – user4852 Apr 13 '11 at 9:31
@user4852: The article says it requires pdflatex, but it works in xelatex as well. – Matthew Leingang Apr 13 '11 at 9:50
@user4852: If you look at the comments on that link you'll see that it is claimed that it does work with the other backend drivers as well. – Loop Space Apr 13 '11 at 9:50

Here is an example: http://tug.org/PSTricks/main.cgi?file=pst-node/nodes#text

\def\VPh{\vphantom{\displaystyle\sum_{i=n}^m {i^2}}}


   \only<1->{\rnode{t1}{\psBox{green!30}{\sum_{i=n}^m {i^2}}} +} 
   \only<2->{\rnode{t2}{\psBox{blue!30}{\int_0^t \mathrm d\:\!\tau}} + 
             \Gamma\bigl(n +\frac{1}{2}\bigr)+ }
   \only<3->{\rnode{t3}{\psBox{red!30}{\frac{1}{2}m\|\mathbf v\|^2}}}

   \item  Power \rnode[rc]{T1}{series} \nccurve[angleB=-75]{T1}{t1}
   \item  Definite \rnode[rc]{T2}{integral}\nccurve[angleB=-90]{T2}{t2} 
   \item  Non-relativistic kinetic \rnode[rc]{T3}{energy}\nccurve[angleB=-90]{T3}{t3}


enter image description here

share|improve this answer
some packages are used,i can't find it – user4852 Apr 13 '11 at 9:18
can't find what? – Herbert Apr 13 '11 at 9:36
ps-tricks,pst-mode – user4852 Apr 13 '11 at 9:39
these packages are part of any tex distribution ... However, you mean pstricks and pst-node – Herbert Apr 13 '11 at 9:47
@user4852: These packages can be found on CTAN. Google "ctan pstricks" etc. – Matthew Leingang Apr 13 '11 at 9:52

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