[twg-tds] Question: how to include an image file in a document class?

[Lei Ye]

Dear all,

I created a document class, "thesis.cls" and need to include an image
file: "logo.png" in the title page that I created in my document class.

When the two files are packaged as a contributed package for CTAN and
the package is installed from a package manager by users,  these two
files reside in two different directories.

Under Windows MikTeX:

"thesis.cls" went to
"C:\Users\username\AppData\Roaming\MiKTeX\2.9\tex\latex\thesis\thesis.cls"
"logo.png" went to
"C:\Users\username\AppData\Roaming\MiKTeX\2.9\doc\latex\thesis\logo.png"


In my "thesis.cls", I have

\includegraphics{logo.png}

But it will not find the "logo.png" file as it has been put into a
different directory as required by TDS.

How can I add the path to the image file in the \includegraphics command
so that it can be found on any installations including Windows and Mac?

I have read the tds.pdf but can not find an answer. Any help would be
appreciated.

Regards,
Lei