Re: Perl mapping solution

From: R. Joseph Newton (rjnewton_at_efn.org)
Date: 01/11/04 

Date: Sun, 11 Jan 2004 12:34:24 -0800
To: Kyle Sexton <ks@mocker.org>

Kyle Sexton wrote:

> I am trying to implement something akin the the perl monger map located
> at http://bath.pm.org/map/. I have got my map to the point that it
> will pull lat/long information from a web server and generate a map.
> What I am looking to do now is implement zooming in on the map like was
> done on the perl monger map. If someone could give me some advice on
> what a good solution to read about is it would be greatly appreciated.
> Thanks in advance.
>
> Thanks,
> Kyle Sexton

This can also be done pretty handily in HTML itself, with the usemap
parameter of the image tag:

<IMG SRC="images/navstrip.jpg" USEMAP="#navmap" BORDER=0>
<MAP NAME="navmap">
<AREA SHAPE="RECT" COORDS="0,0,48,44" HREF="firstpage.htm">
<AREA SHAPE="RECT" COORDS="49,0,98,49" HREF="anotherpage.htm">
<AREA SHAPE="RECT" COORDS="99,8,148,49" HREF="thispage.htm">
<AREA SHAPE="RECT" COORDS="149,0,198,39" HREF="thatpage.htm">
</MAP>

Of course, you might want to direct the HREFs to a CGI script, perhaps with
some plot label as a query string, rather than calling static pages.

I was thinking that maybe some Javascript could help you get the mouse
coordinates of a click, but it would be indirect, since JS doesn't have
onclick events for images, and the coordinate systems for which JS does
provide x and y values are not easily resolnable relative to the
cooridnates within an image.

For very precise client-side interactvity, you might consider using a Java
applet to display the map. That would allow you to have some real
intelligence operating on the client end.

Joseph

Loading