“Dynamic” picture in beamer presentation

Question

Is there a way in beamer to have some kind of dynamic picture that will change if the mouse is moved over it or if the button is clicked?

Answer 1

Here is a straightforward solution using a Widget Annotation (Push Button) according to the PDF specification. It displays different pictures depending on the current mouse position and its button state (out, roll-over, button-down).

\documentclass{article}
\usepackage{mwe}

\newsavebox\imga
\newsavebox\imgb
\newsavebox\imgc
\sbox\imga{\includegraphics{example-image-a}}
\sbox\imgb{\includegraphics{example-image-b}}
\sbox\imgc{\includegraphics{example-image-c}}
\edef\imgwd{\the\wd\imga}
\edef\imght{\the\ht\imga}

\immediate\pdfxform\imga
\edef\normalappearance{\the\pdflastxform\space 0 R}
\immediate\pdfxform\imgb
\edef\overappearance{\the\pdflastxform\space 0 R}
\immediate\pdfxform\imgc
\edef\downappearance{\the\pdflastxform\space 0 R}

\begin{document}

\hbox to \imgwd{\vbox to \imght{\vss%
  \pdfannot width \imgwd height \imght depth 0pt {
    /Subtype/Widget
    /F 4
    /FT/Btn/Ff 65536
    /T (my dynamic image) % Widget name; must be unique
    /H/P
    /AP <<
      /N \normalappearance
      /R \overappearance
      /D \downappearance
    >>
  }%
}\hss}

\end{document}

In case of multiple Widget annotations, the Widget's names, as specified by the /T (...) entry, must be uniqe.