CGI Mapserver: raw URL zooming manipulation

[Steven Monai]

Matt:

Looking at some of my old browse-mode, CGI-mapserver "play" files (circa
2003! how time flies...), my template files always seemed to have the
following hidden variables within the form:

<input type="hidden" name="imgxy" value="[center]">
<input type="hidden" name="imgbox" value="[center] [center]">
<input type="hidden" name="imgext" value="[mapext]">
<input type="hidden" name="mapext" value="">
<input type="hidden" name="mode" value="browse">

Accordingly, to invoke the effect you're looking for (i.e. to zoom in from
the full extent by some given zoom factor) I suggest including the following
fragment in your URL:

imgxy=330.0+247.5&imgbox=330.0+247.5+330.0+247.5&imgext=189775.375+4810000+761662.375+5472414.5&mapext=&mode=browse

(Also, see the comment by Peter Slizik at the bottom of this page:
http://mapserver.gis.umn.edu/docs/reference/cgi .)

Hope this helps,
-SM
--


On Fri, 7 Dec 2007 00:09:04 -0600, Matthew Pettis <matthew.pettis at GMAIL.COM>
wrote:

>Hi Rich,
>
>Thanks... the same problem persists when i use 'mode=browse' and use the
>resulting image...
>
>What might be related is the 'img' cgi control... can someone explain this
>to me?  i read the documentation, but i don't get it... it doesn't show what
>value (if any)... here is the documentation entry:
>
>IMG
>>
>> The name associated with the inline map image used to record user clicks.
>> What actually is passed are two variables, img.x and img.y.
>>
>> For the CGI Applications this is an essential variable, see the examples
>> for sample usage.
>>
>
>there is no indication what type of value should be associated with it (like
>the other values in the reference indicate... like "ID [id-string]"), but it
>says it is essential and see the examples (which examples, i don't
>know...).  can someone explain further how this control is used in a get
>statement issued to the mapserv binary?
>
>thanks,
>matt
>
>On Dec 6, 2007 5:20 PM, rich.fromm <nospam420 at yahoo.com> wrote:
>
>> Matthew.Pettis at gmail.com wrote:
>> >
>> > url:
>> > ----
>> >
>>
http://localhost/cgi-bin/mapserv.exe?zoom=2&img.x=330&img.y=247.5&mapext=189775.375+4810000+761662.375+5472414.5&map=C:/ms4w/Apache/htdocs/tst/race.map&layer=county&mode=map
>> > result:
>> > --------
>> > map image of full extent from mapfile is returned... not the zoomed
>> image.
>> >
>>
>> i'm not positive, but afaict, zoom is not relevant for map mode.  and if
>> you're just trying to do a simple request and response, the way to do this
>> is to calculate the extent yourself.  zoom in, smaller extent.  zoom out,
>> larger extent.
>>
>> i might be wrong on this, but this is how i'm doing things.
>>
>> - rich
>>
>> --
>> View this message in context:
>>
http://www.nabble.com/CGI-Mapserver%3A-raw-URL-zooming-manipulation-tf4958616.html#a14203503
>> Sent from the Mapserver - User mailing list archive at Nabble.com.
>>
>
>
>
>--
>It is from the wellspring of our despair and the places that we are broken
>that we come to repair the world.
>-- Murray Waas
>