mode etc documentation

[Stephen Davies]

Thanks for the feedback but the references you give don't really answer 
my questions.

The CGI reference lists the modes (I had seen this list but didn't 
realise that it was THE list) but says nothing to explain how/why the 
tutorial code works:

    document.scalebar_kilometers.src = MapServer + "?map=" + ms.mapfile 
+ "&map_scalebar_units=kilometers&mode=scalebar&mapext=0+0+" + 
(ms.extent[2] - ms.extent[0]) + "+" + (ms.extent[3] - ms.extent[1]) + 
"&mapsize=" + ms.width + "+" + ms.height;

Clearly scalebar mode uses the "size" of the map and the size of the 
image to do it's job but the doco doesn't say anything about the extent 
change.

I see nothing in the Mapfile reference to do with code. My current 
application works fine except that the "box of interest" does not 
display on my reference map when I project the data. I had to make a 
number of changes to get the demo javascript code to work with southern 
hemisphere data and want to check to see if there is a similar problem 
with this. 
Is the box drawn by mapserv reference mode or by javascript?
I would expect it to be in the javascript but cannot see it.

I understand what you say about the two extents and have just found the 
javascript code that uses them.

I have read/run pretty much all of the doco/demos at umn etc and have 
made good progress in getting my application up and running. There are 
just a few bits and pieces that I still need.

Cheers and thanks,
Stephen  

On Wed, 9 Nov 2005 01:53 pm, Fawcett, David wrote:
> Comments in-line
> 
> 
> -----Original Message-----
> From: UMN MapServer Users List on behalf of Stephen Davies
> Sent: Tue 11/8/2005 8:55 PM
> To: MAPSERVER-USERS at LISTS.UMN.EDU
> Subject: [UMN_MAPSERVER-USERS] mode etc documentation
>  
> G'day again.
> 
> A couple more questions please.
> 
> Where are the various mapserv modes documented?
> 
> I see references to map, query, scalebar, legend modes but cannot find
> details of exactly what each one does and which mapfile entries are 
used and
> whether there are any more modes available.
> 
>    DF:  Take a look at: 
http://ms.gis.umn.edu/docs/reference/cgi/controls  scroll down to 
'Mode'
> 
> Where is the code that draws the "box of interest" on the reference 
map?
> 
>    DF:  http://ms.gis.umn.edu/docs/reference/mapfile/reference   
> 
> What is the relationship between map extent and reference extent? Are 
they
> simply used to scale between the two images?   
>    
>    DF:  The reference extent defines the spatial extent for the 
reference map.  It doesn't have to be the same as the original map 
extent, but it makes sense that it is similar.  The EXTENT defined in 
your map file only sets the initial map extent, the extent then changes 
as you zoom in, out, and pan.  
> 
> Like Steven said, one of the easy ways to learn MapServer is to get a 
demo (http://cvs.gis.umn.edu/dist/itasca3.5.tar.gz) working and then 
modify it to fit your data.  There is also a tutorial at 
http://hypnos.cbs.umn.edu/tutorial/
> 
> If you haven't already looked at it, check out the MapServer New Users 
Page http://ms.gis.umn.edu/new_users
> 
> Good Luck, 
> 
> David.
> 
> Thanks in anticipation,
> Stephen Davies
> 
> 

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