How do I use Xmosaic's ISMAP flag with CERN httpd

Marcus Speh (marcus@x4u.desy.de)
21 Jun 1993 09:03:02 +0000 (GMT)


I am currently writing the hypertext doc to a class library
which I want to be fully transparent for the public. Thus, I
prepared an image of the Class Inheritance Tree with neat
boxes. I thought I'd use the ISMAP feature [I have XMosaic v1.1
for SGI-Irix4d]: I followed your demo, i.e. I have a file which
contains
<xmp>
<A HREF="./decodeMGLIB"><IMG SRC="MGLIB-all.gif" ISMAP>
</A>
</xmp>
and in the same dir a file
<xmp>
/decodeMGLIB
</xmp>
containing
<xmp>
<A HREF="/decodeMGLIB?90,400">ISU</A>
<A HREF="/decodeMGLIB?180,299">MultiGrid</A>
</xmp>
Now, only if I accidentally hit the right coordinates,
(90,400) or (180,299), I get the wanted answer, written to files
named
<xmp>
/decodeMGLIB?90,400
/decodeMGLIB?180,299
</xmp>

respectively, while for other coordinates, I get the error:
<XMP>
**** HTAccess: socket or file number returned by obsolete
load routine! **** HTAccess: Internal software error.
Please mail www-bug@info.cern.ch!
</XMP>
In his reply, Tony Sanders (sanders@bsdi.com)
who contributed this feature said he did not even know the
CERN httpd supported it. Tony also writes:
<PRE>
What Mosaic
should be passing to the server for your example
would be:

GET /decode?xxx,yyy

It's the job of the server to decode the xxx,yyy
coords and translate that to some document.

> these are the upper right corners of subimages

I would imagine that you have to describe both corners,
and I'll bet it's the upper-left and lower-right, not
upper-right but that's just a guess.
</PRE>
Now, I dont know whether this quote helps, but maybe one or the
other wizard at CERN, or an XMosaic expert knows the answer.
If that should be necessary: the files I am talking about above are
at at URL http://info.desy.de:80/pub/www/refs/test, or
<A HREF="http://info.desy.de:80/pub/www/refs/test">here</a>
(if you're reading this with WWW)
<P>
<A HREF="http://info.desy.de:80/pub/www/people/marcus.html">
marcus </a>