ANNOUNCE: Java image mapping applet & image map editor

ANNOUNCE: Java image mapping applet & image map editor

Post by Cheong S A » Sun, 17 Mar 1996 04:00:00

I believed this wasn't sent successfully, so here it goes again.  

If you like client-side image mapping, and Java, please try the following

Filename: PMAP10.ZIP
Size:  approximately 382,740 bytes

(1) Polymap Toolkit 1.0s (shareware version) defines arbitrary polygon regions
that can be associated with object names in GIF images.
(2) Java Polymap Applet 1.0 uses the above images to do client-side image mapping
for the WWW with simple tags in the HTML document such as
<applet code=ImageMap.class width=503 height=453>
<param name=img value=my_pmap.gif>

Polymap Toolkit allows you to edit Polymap objects in a GIF image.  A Polymap
object consists of one or more polygons and an object name.  A Polymap GIF file
carries one or more Polymap objects in its application-specific field.  The
Polymap information you create is stored using the application extension of GIF
89a, therefore a Polymap GIF file is still a valid GIF file that can be read by
all GIF readers. Polymap (the technique) can be used to define polygon regions in
the GIF image contained in the file. By associating the defined regions with
descriptive names that may be interactively displayed, or serve as input to other
applications, you may use Polymap to implement image maps in multimedia
applications that perform certain actions when an object is selected.  The Java
Polymap viewer included in this distribution demonstrates an application of
Polymap:  client-side image mapping on the World-Wide Web.  This Java applet
provides the kind of interactivity unavailable in the standard server-side ISMAP.  
But unlike other client-side image mapping techniques which keeps messy region
definition information in HTML documents, the Java/Polymap technique encapsulates
compressed Polymap information in the image files, resulting in a
tightly-coupled, and self-contained system that is easy to manage.  Furthermore,
through compressing image-mapping information, this mechanism saves storage space
and transmission time.

FTP site: in directory /pub/polymap
WWW site:

Thank you.

Cheong S Ang


1. Image map & sub-directories not accessible

We have a peculiar problem and nobody seems to be able to solve
it. Is there a solution or not? And what is the nature of the
problem. Please...
We have 2 problems at our site:

1. Often users cannot access a page which is down the directory
hierarchy. Eg, some users cannot access the following page:
by typing in the URL. However, if they go to our main URL and
click into the hierarchy, they can acess it.
2. The clickable map on the main URL is not available to all

The kind of message unsuccesful attempts get is to the effect
that there is no such DNS or that the server denies them access.
Never the message that the server is temporarily down or
something like that.

We run an SGI Webforce server, linked via a 64Kbps diginet line
through Sprintlink (now Global One). We operate from the Odyssey
Internet Cafe in Hatfield, Pretoria, South Africa. The links are
sucessfully accessible by all the workstations in the cafe -- ie
both the direct URL and the clickable map.

When we first encountered the problem we thought it was a server
set-up problem. However, the SGI maintenance company is of the
opinion there is nothing wrong. Then we thought the problem must
be on the side of our service provider. However, on testing again
and again tyhere seemed to be nothing wrong and we suspected in
particular 2 local service providers because all the complaints
of not being able to access our site came from their customers --
we thought they did not update their name-servers. But now we
have received complaints from Sprintlink customers as well. Yet
the Sprintlink sysop can access the page directly, which means
name resolving is successful.

So from the server side of our router for all the workstations
everything is fine: both image map and URL lower down the
directory hierarchy. On the other side of our router our service
provider's sysop can also access everything without a problem.
Looking at our access log it seems that there are many successful
attempts from many different service providers and countries.
Yet, without the lines or server being down sometimes users just
cannot get access. And this happens everytime the attempt.

What are we missing?

2. name resolving & mksysb

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4. GDI Printer support

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6. Please Help a Non-Tecchie Technical Recruiter!

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