Graphics, Figures & Tables ⇒ Embed clickable Pictures in a PDF Document

[Cham]

I'm wondering if this is possible in pdfLaTeX, and if it is, how can we do it ?

Is there a way to place a small clickable icon in a PDF such that, once clicked on it, it brings a large picture to the front (using the default OS viewer) ?

Ideally, the large picture should be included in the PDF document, but stay invisible by default. The clickable visible icon is the "door" to the large picture.

[alex]

It is possible.

Here is a solution based on JavaScript. It requires AdobeReader, though. There is only one image file, the final one at final resolution, to be embedded. It is scaled down to the size of a thumbnail using the `scale` option of `\includegraphics`. When it is clicked on, it will be enlarged to fit into the document window of the Reader, when clicked again, Reader zoomes out again.

The code example below defines the command `\zoombox[<box line width>]{<contents>}` where the optional `<box line width>` controls the width of the dotted line around the zoom box to be created. The content for zooming can be arbitrary material, such as text or a downscaled graphic, and is put into the mandatory second argument of `\zoombox`.

Code: Select all

% (C) 2011, Alexander Grahn, Lic: Public Domain
\documentclass{article}
\usepackage{graphicx}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\newsavebox\zbox
\newcounter{zoom}
\newcommand{\zoombox}[2][0]{%
  \leavevmode%
  \sbox\zbox{#2}%
  \pdfdest name {zb\thezoom.out} fit
  \pdfdest name {zb\thezoom.in} fitr
    width  \the\wd\zbox\space
    height \the\ht\zbox\space
    depth  \the\dp\zbox\space
  \immediate\pdfannot
    width  \the\wd\zbox\space
    height \the\ht\zbox\space
    depth  \the\dp\zbox\space
  {%
    /Subtype/Link/H/N
    /Border [0 0 #1 [1 2]]
    /A <<
      /S/JavaScript
      /JS (
        if(typeof(zoomed\thezoom)=='undefined'){
          this.gotoNamedDest('zb\thezoom.out');
          var zoomed\thezoom=false;
        }
      )
      /Next <<
        /S/GoTo/D (zb\thezoom.in)
        /Next <<
          /S/JavaScript
          /JS(
            if(zoomed\thezoom){
               this.gotoNamedDest('zb\thezoom.out');
               zoomed\thezoom=false;
            }else{
               zoomed\thezoom=true;
            }
          )
        >>
      >>
    >>
  }%
  \usebox{\zbox}%
  \stepcounter{zoom}%
}
\makeatother
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

\begin{document}
\zoombox{\includegraphics[scale=.05]{tiger}}
\end{document}

zoombox.pdf

Example document from LaTeX source code listed above.

(39.92 KiB) Downloaded 452 times

[Cham]

I tried your code above. After compilation, I get a PDF document with a thumbnail, but it doesn't do anything when I click on it. It doesn't work ! (I'm not using AcrobatReader. I'm using Preview, in OS X).

Is there an "universal" way to define a "zoombox" in pdfLaTeX ?

[alex]

Is there an "universal" way to define a "zoombox" in pdfLaTeX ?

As I said, a PDF Reader with JavaScript interpreter is needed for the above example to fully work. The most reliable one is Adobe Reader, Evince (open-source) or Foxit may work as well but I didn't test.

Any PDF reader should at least fulfil the PDF specification and allow for zooming-in on the first click. The JavaScript in my example is only needed to zoom-out on the second click. It seems that Preview is not a conforming PDF reader, something that Adobe cannot be blamed for.