[Mapserver-users] Maximum Extent

Wed Jan 15 00:00:23 PST 2003

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Hi everybody,

is there a possibility to specify the maximum extent within MS?

In my case I use layers covering the whole world. The default extent to be=
=20
displayed (the first map-image shown) is only Western Europe. If someone=20
zooms out from here I don't want the map to zoom out more then the extent=20
of Europe (west > -20=B0, east < 180=B0).

I tried to verify the coordinates after the "$map ->=20
zoompoint($zoom_factor, $my_point, $map -> width, $map -> height,=20
$my_extent);" (MapScript/PHP) event and to re-zoom if the coordinates=20
extend over the max/min values. But this seems to be not very elegant.=20
There should be a nicer solution. The EXTENT command in the map file only=20
gives the coordinates to start with, but not the max/min values, right?

Thanks for any hints,

Stefan

         _______________________________________

         Stefan Schwarzer
         Consultant on GEO

         UNEP/DEWA/GRID-Geneva
         Chemin des Anemones 11
         CH - 1219 Chatelaine
         Switzerland

         Tel: (+41) 22.917.83.49
         Fax: (+41) 22.917.80.29

         Email: stefan.schwarzer at grid.unep.ch
         Internet: http://geodata.grid.unep.ch/
         _______________________________________=20
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Hi everybody, 
is there a possibility to specify the maximum extent within MS? 
In my case I use layers covering the whole world. The default extent to
be displayed (the first map-image shown) is only Western Europe. If
someone zooms out from here I don't want the map to zoom out more then
the extent of Europe (west > -20=B0, east < 180=B0). 
I tried to verify the coordinates after the
"$map -> zoompoint($zoom_factor, $my_point,
$map -> width, $map -> height, $my_extent);"
(MapScript/PHP) event and to re-zoom if the coordinates extend over the
max/min values. But this seems to be not very elegant. There should be a
nicer solution. The EXTENT command in the map file only gives the
coordinates to start with, but not the max/min values, right? 
Thanks for any hints, 
Stefan 
 
<x-sigsep></x-sigsep>
<font=
 size=3D3><x-tab>        </x-tab>___=
____________________________________ 
<x-tab>       &nbsp=
;</x-tab>Stefan
Schwarzer 
<x-tab>        </x-tab>Consultan=
t
on GEO 
<x-tab>        </x-tab>UNEP/DEWA/GRI=
D-Geneva 
<x-tab>        </x-tab>Chemin des
Anemones 11 
<x-tab>        </x-tab>CH - 1219
Chatelaine 
<x-tab>        </x-tab>Switzerland<b=
r> 
<x-tab>        </x-tab>Tel: (+41)
22.917.83.49 
<x-tab>        </x-tab>Fax: (+41)
22.917.80.29 
<x-tab>        </x-tab>Email:
stefan.schwarzer at grid.unep.ch 
<x-tab>        </x-tab>Internet:
<a href=3D"http://geodata.grid.unep.ch/"=
 eudora=3D"autourl">http://geodata.grid.unep.ch/</a> 
<font=
 size=3D3><x-tab>        </x-tab>___=
____________________________________</body>
</html>

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