[ka-Map-users] kaXmlOverlay not working..

[Stephen Woodbridge]

Hi Chris,

An interesting article, thanks.

The obvious thing that comes to my mind is that you are using pgdjkstra 
to compute the route, so why not store the route geometry in a session 
table and return a uid to the session. You could then create a mapfile 
LAYER or separate mapfile to generate the route overlay, based on the 
session uid. Eg: you would just spit out an overlay image of the route.

I would then just request an new image on pan/zoom in ka-map based on 
the uid and swap it with the current image. While this would request a 
new image on every pan/zoom it would be only the route segments and it 
would be very fast and low overhead and scalable in terms of users, size 
of route, etc.

You would not want to request an image of the whole route because when 
zoomed in to a scale of like 1:2500 in a case the route went from NY to 
CA as it would be huge. On the other hand the amount of code to handle 
image nXn the view port becomes messy on the client but is certainly 
doable and would allow some panning before a new image was requested at 
the cost of always asking for more image than you will probably use.

-Steve W.

Chris Tweedie wrote:
> Hey guys, just a headsup that I have done a quick article on my blog at
> http://chris.narx.net which is based on PG's kaXMLOverlay code and my
> previous routing article.
> 
> Unfortunately I don't have any time to extend the functionality to the
> level I would of liked, so I hope I've inspired someone to keep working
> on something similar.
> 
> Pg, I found a few quirks/problems with the current code (see comments at
> end of article). Hopefully I get some time in the coming weeks to
> suggest/help with some changes. 
> 
> Enjoy,
> 
> Chris
> 
> -----Original Message-----
> From: ka-map-users-bounces at lists.maptools.org
> [mailto:ka-map-users-bounces at lists.maptools.org] On Behalf Of Pg
> Sent: Friday, 3 February 2006 4:02 AM
> To: ka-map-users at lists.maptools.org
> Subject: Re: [ka-Map-users] kaXmlOverlay not working..
> 
> I've a couple of hints:
> 
> 1. The XML is served with no mime type by your web server. It should
> have a mime type "text/xml". Configure your server to associate ".xml"
> files with the correct mime, or, if you generate the XML dynamically,
> use a directive to set the mime type.
> Look at the source code of the script used in my example:
> 
>   http://sistel.dyndns.info/ka-map/xmlget.php.txt
> 
> 2. The map shoul be initialized before the overlay get loaded: i
> usually create the overlay in the KAMAP_MAP_INITIALIZED event handler.
> 
> Bye
> - Pg
> 
> 
> 2006/2/2, harry at politistaten.dk <harry at politistaten.dk>:
> 
>>Seems like it - fixed. Only, now it can't load the XML file.
>>
>>"Error: xmlDocument has no properties
>>Source: http://localhost/ka-map/htdocs/kaXmlOverlay.js
>>Line: 160"
>>
>>I also tried the same script that
>>http://sistel.dyndns.info/ka-map/indext.html uses for initializing -
> 
> no
> 
>>luck.
>>
>>
>>>hi, it looks like you define init(), but never call it. or did i
> 
> just miss
> 
>>>that?
>>> -b
>>>
>>
>>_______________________________________________
>>ka-Map-users mailing list
>>ka-Map-users at lists.maptools.org
>>http://lists.maptools.org/mailman/listinfo/ka-map-users
>>
> 
> 
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