[mapserver-users] Zooming with CGI Parameter

[Burgholzer, Robert (DEQ)]

Hey Steve - thanks a ton for the response.  My aim was to have it do just as you describe, take the given extent as a starting point, then zoom - will post back when I figure it all out.

regards,
/r/b
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From: Lime, Steve D (MNIT) [Steve.Lime at state.mn.us]
Sent: Friday, January 17, 2014 9:05 AM
To: Burgholzer, Robert (DEQ); mapserver-users at lists.osgeo.org
Subject: RE: Zooming with CGI Parameter

The zooming assumes the user is interacting with an image described by imgext and imgsize, so you're close. You can try those parameters instead of mapext and mapsize.

On thing to note that the supplied extent will be adjusted to fit the size provided. This means the supplied extent may not match what is used to render the map. These params where always meant to be used with MapServer templates so you don't have to worry about those calculations. Otherwise you' may need to keep track of fitting the extent on the client.

Steve

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From: mapserver-users-bounces at lists.osgeo.org [mapserver-users-bounces at lists.osgeo.org] on behalf of Burgholzer, Robert (DEQ) [Robert.Burgholzer at deq.virginia.gov]
Sent: Thursday, January 16, 2014 4:50 PM
To: mapserver-users at lists.osgeo.org
Subject: [mapserver-users] Zooming with CGI Parameter

Hello,
I am trying to get my maps to dynamically Zoom out from a location via a CGI call with URL variables.  I am using mapserver 6.2, and calling in MODE=MAP since I am embedding the call in some HTML, I don’t know if that matters.  I am also giving a MAPEXT, but what I would like is to have it ZOOM out from that MAPEXT a bit.

I have tried the URL parameters: ZOOM, and the combo of ZOOMOUT/ZOOMDIR – all seem to have no success.  I have also tried SCALEDENOM and my map dissapears (values between 2400 – 24000 – 240000) – I confess that my topography knowledge is lacking there.  Any help would be appreciated – below are functioning URLs (but they don’t scale).

Examples (ZOOM=-1):
http://deq2.bse.vt.edu/cgi-bin/mapserv?map=/var/www/html/mapserv/drupal_wsp_data.map&layers=model_elements&layers=coverage_system_scaled&mode=map&imgext=-83.6754%2036.4698%20-81.2611%2037.2408&IMGSIZE=480%20320&nid=184694&zoom=-1

Examples (ZOOMSIZE=-1&ZOOMDIR=0):
http://deq2.bse.vt.edu/cgi-bin/mapserv?map=/var/www/html/mapserv/drupal_wsp_data.map&layers=model_elements&layers=coverage_system_scaled&mode=map&mapext=-83.6754%2036.4698%20-81.2611%2037.2408&MAPSIZE=480%20320&nid=184694& ZOOMSIZE=-1&ZOOMDIR=0

Robert  Burgholzer
Surface Water Modeler
Virginia DEQ Office of Surface and Ground Water Supply
804-869-3066