# Image link clickable in non-white areas (excluding the background)

Consider image sample below. I'm including it using \includegraphics and I have linked it to an url using \href.

What I would like is to have it in the pdf file in such a way that the mouse would only allow you to follow the link when passing over the grey zone and not through the white background.

I'm using a png file with no background but with no success...

Does someone know how to do this?

Thank you so much in advance!

:

• The only way I can see this being possible is if you break up the shaded area into small rectangles (yes, a rectilinear object), overlap them with the shaded area manually and hyperlink them all. Good luck. – Werner May 9 '14 at 15:55
• Hi Werner! Thanks for the answer. It would take me forever to get it done... So i'm going to give up on this feature. Although I would really love to have it :) Thanks anyway. – Pedro May 13 '14 at 17:23
• This could be done, but it would take a lot of work. Basically one could construct a somewhat pixelated version of the image using a tikz matrix. For a 50x50 grid using 1 letter (local) macro names would involve 50 lines of 151 characters each. You would need both upper and lower case for the map shown. – John Kormylo Aug 12 '15 at 13:02

This was done on a smaller scale for a map of Hawaii using a 20x20 grid. For the final version you set the opacity of the map to 1. I find using a checkerboard background helps when aligning links to the map. Using a \parbox instead of tikz \matrix is much faster.

I stole the map from http://www.enchantedlearning.com/usa/states/hawaii/map.GIF and converted to png.

\documentclass[multi={tikzpicture,minipage}]{standalone}
\usepackage{tikz}

\newsavebox{\tempbox}
\newlength{\cellwidth}
\newlength{\cellheight}

\begin{document}
\savebox{\tempbox}{\includegraphics{images/map.png}}
\setlength{\cellwidth}{\dimexpr \wd\tempbox / 20}
\setlength{\cellheight}{\dimexpr \ht\tempbox / 20}
\begin{tikzpicture}
\def\a{\mbox{\color{white}\rule{\cellwidth}{\cellheight}}}
\def\b{\rule{\cellwidth}{\cellheight}}
\a\b\a\c\c\b\a\b\a\b\a\b\a\b\a\b\a\b\a\b\\
\b\d\c\c\c\a\b\a\b\a\b\a\b\a\b\a\b\a\b\a\\
\a\d\a\c\a\b\a\b\a\b\a\b\a\b\a\b\a\b\a\b\\
\b\a\b\a\b\a\b\a\e\a\b\a\b\a\b\a\b\a\b\a\\
\a\b\a\b\a\b\a\b\e\b\a\b\a\b\a\b\a\b\a\b\\
\b\a\b\a\b\a\b\a\e\e\b\a\b\a\b\a\b\a\b\a\\
\a\b\a\b\a\b\a\b\a\b\a\f\f\b\a\b\a\b\a\b\\
\b\a\b\a\b\a\b\a\b\a\b\a\b\h\b\a\b\a\b\a\\
\a\b\a\b\a\b\a\b\a\b\a\g\g\h\h\b\a\b\a\b\\
\b\a\b\a\b\a\b\a\b\a\b\g\b\h\h\h\b\a\b\a\\
\a\b\a\b\a\b\a\b\a\b\a\b\i\i\a\b\a\b\a\b\\
\b\a\b\a\b\a\b\a\b\a\b\a\b\a\b\a\b\a\b\a\\
\a\b\a\b\a\b\a\b\a\b\a\b\a\b\a\j\j\b\a\b\\
\b\a\b\a\b\a\b\a\b\a\b\a\b\a\b\j\j\j\b\a\\
\a\b\a\b\a\b\a\b\a\b\a\b\a\b\a\j\j\j\j\b\\
\b\a\b\a\b\a\b\a\b\a\b\a\b\a\b\j\j\j\j\a\\
\a\b\a\b\a\b\a\b\a\b\a\b\a\b\a\j\j\j\j\b\\
\b\a\b\a\b\a\b\a\b\a\b\a\b\a\b\j\j\j\j\a\\
\a\b\a\b\a\b\a\b\a\b\a\b\a\b\a\j\j\b\a\b\\
\b\a\b\a\b\a\b\a\b\a\b\a\b\a\b\j\j\a\b\a}};
\node[opacity=.5] at (links) {\usebox{\tempbox}};
\end{tikzpicture}
\begin{minipage}{2cm}\hypertarget{niihau}{Niihau}\end{minipage}
\begin{minipage}{2cm}\hypertarget{kauai}{Kauai}\end{minipage}
\begin{minipage}{2cm}\hypertarget{oahu}{Oahu}\end{minipage}
\begin{minipage}{2cm}\hypertarget{molokai}{Molokai}\end{minipage}
\begin{minipage}{2cm}\hypertarget{lanai}{Lanai}\end{minipage}
\begin{minipage}{2cm}\hypertarget{maui}{Maui}\end{minipage}
\begin{minipage}{2cm}\hypertarget{kahoolawe}{Kahoolawe}\end{minipage}
\begin{minipage}{2cm}\hypertarget{hawaii}{Hawaii}\end{minipage}
\end{document}