[mapserver-users] Mouse Overs on a Map?

[Mark.Wilson at rohoel.at]

I have used Overlib with Mapserver. I got around the image map / form
problem by having the main map as the image map, responding to mouseover
events. Mouseclicks in overlib popups caused a link to be followed.

For the navigation side, I simply had a normal reference map, and
underneath it, another small version of the main map labelled "navigation",
where the user could click to pan or zoom, depending upon the value of the
radio buttons, as per a normal interface.

It is a compromise. It worked for me because I was displaying only filled
country outlines with point data. Some maps may look pretty ugly compressed
to such small sizes, depending upon the data being displayed.

Unfortunately, I've screwed up my mapscript installation, so I can't point
you to a working example at the moment.

Hope that helps,
Mark W.






"Stephen Lime" <steve.lime at dnr.state.mn.us>@lists.gis.umn.edu on 06/12/2001
18:13:29

Sent by:  owner-mapserver-users at lists.gis.umn.edu


To:   <Jean-Francois.Doyon at ccrs.nrcan.gc.ca>,
      <mapserver-users at lists.gis.umn.edu>
cc:

Subject:  Re: [mapserver-users] Mouse Overs on a Map?


Can an form image also be used as an image map? I didn't think so. That
makes it hard to combine a normal pan/zoom interface with an image map.
(Please correct me if I'm wrong.) My work around was to build that sort of
functionality in to the mapplet java piece I've got. I use mapscript to
loop through the label cache and produce essentially an image map (stored
in XML). Some examples are:

  http://www.dnr.state.mn.us/cgi-bin/mapdoqs.pl

Zoom in close to see the DOQs and move your mouse over the little red
pixels to see data in a small popup. Another fancy example is at:

  http://www.dnr.state.mn.us/weather/map.html

although there seems to be a problem with the data at the moment.

At any rate dumping the label cache is not difficult, the problem is how to
implement best on the client-side.

Steve

Stephen Lime
Data & Applications Manager

Minnesota DNR
500 Lafayette Road
St. Paul, MN 55155
651-297-2937

>>> "Doyon, Jean-Francois" <Jean-Francois.Doyon at ccrs.nrcan.gc.ca> 12/06/01
09:09AM >>>
Hello,

I know it's doable, but I'm wondering exactly how hard, or if there are any
examples out there?

I think it's got something to do with using MapScript in order to generate
the ISMAP files, somehting to do with the labelling buffer I beleive?

Ideally I'd like to use something like overlib in combination with a
mapping
tool, but right now I'm just curious about how hard it is and how long it
would take before I commit to providing this feature!

Thanks,

Jean-François Doyon
Internet Service Development and Systems Support
GeoAccess Division
Canadian Center for Remote Sensing
Natural Resources Canada
http://atlas.gc.ca
Phone: (613) 992-4902
Fax: (613) 947-2410