[ka-Map-users] Animated Maps - iboattrack.mapsherpa.com

[David Bitner]

Please commit the fourth option.  I think that it makes a lot of sense
especially if you can give an example of how to set the cgi parameters
to get passed to MapServer for variable substitution.

David

On 3/24/06, Tim Schaub <tim at commenspace.org> wrote:
> > > Well, what if I want to animate the
> > > base data, by altering the mapfile Layer Filters and/ or Class
> > > Expressions on the fly (although this would have a variety of uses
> > > beyond that)?
>
> Brandon -
>
> Don't know if this gets at what you're looking for, but here's the
> approach I have taken (see the "NOCACHE" option below).  I've added a
> "TILE_SOURCE" metadata option for layers in the mapfile.  The possible
> values for "TILE_SOURCE" are:
>
> "AUTO"
> If you don't specify anything, or if you specify "AUTO", then ka-map
> behaves as it always has - tile.php is called from the client side and
> if tiles exist in the cache, they are used.  If tiles don't exist, they
> are generated by tile.php.
>
> "CACHE"
> If you have pre-rendered all your layers (groups) in your cache, you can
> have the client side call those cached tiles directly (so tile.php
> doesn't get called in this case).  This options requires that you
> specify a web accessible path to your cache in config.php (see
> congif.dist.php for an example).  This option is useful if you have very
> static data (seldom updated on the server side).
>
> "REDRAW"
> If you specify "REDRAW" for the "TILE_SOURCE", then tile.php is called
> and will re-render the requested tile (and metatile).  This option might
> be useful if you have frequently updated data (many updates on the
> client side).
>
> "NOCACHE"
> This option is similar to "REDRAW", but a script called tile_nocache.php
> is called instead of tile.php.  One difference is that only the
> requested tile is rendered (not the whole metatile).  Also, this tile is
> sent directly to the browser without writing it to your cache (though it
> is written to the temp directory specified by IMAGEPATH in your
> mapfile).  The real benefit of this options is that it also allows for
> variable substitution (as with mapserver cgi).  So, if you have data
> that is defined by something that the client does (select options from a
> form for example), you can create a query on the client side that will
> be substituted for a variable in your mapfile (in the DATA, FILTER,
> CONNECTION, or class EXPRESSION).
>
> The first three options are available in CVS.  I have not committed the
> fourth option, but would if it made sense to others.  If you've read
> this far down, I'm hoping it makes sense.  It seems like a valuable
> addition to me, but I think I've had trouble explaining the utility to
> others.
>
> I hope to have an example of these options that I can show around some
> time soon.  After that, I'll create some documentation.
>
> Let me know if you need any more detail,
> Tim
>
>
> > -----Original Message-----
> > From: ka-map-users-bounces at lists.maptools.org
> > [mailto:ka-map-users-bounces at lists.maptools.org] On Behalf Of
> > Paul Spencer
> > Sent: Friday, March 24, 2006 9:28 AM
> > To: Brandon Plewe
> > Cc: ka-map-users at lists.maptools.org
> > Subject: Re: [ka-Map-users] Animated Maps - iboattrack.mapsherpa.com
> >
> > Brandon,
> >
> > Tim Schaub has been working on something similar I think.  He
> > is keen to be able to generate tiles using map file
> > substitution and avoiding the tile cache.  I think it is a
> > work in progress, but perhaps he can comment more on this.
> >
> > Cheers
> >
> > Paul
> >
> > On 24-Mar-06, at 11:07 AM, Brandon Plewe wrote:
> >
> > > This relates to a question I had earlier that never got a
> > response.
> > > On the site mentioned, I'm sure the points were created and managed
> > > within ka-map javascript, right?  Well, what if I want to
> > animate the
> > > base data, by altering the mapfile Layer Filters and/ or Class
> > > Expressions on the fly (although this would have a variety of uses
> > > beyond that)?  From what I've seen, nothing in ka-Map seems
> > to go back
> > > and alter the underlying mapserver; it only changes what happens to
> > > the maps after they're generated.  How hard would it be to
> > add such a
> > > functionality?  I could probably build & contribute it if someone
> > > could suggest an overall strategy.  The new function for
> > turning off
> > > the cache for specific layers will certainly help.
> > >
> > > Brandon
> > >
> > > _______________________________________________
> > > ka-Map-users mailing list
> > > ka-Map-users at lists.maptools.org
> > > http://lists.maptools.org/mailman/listinfo/ka-map-users
> >
> > +-----------------------------------------------------------------+
> > |Paul Spencer                           pspencer at dmsolutions.ca   |
> > +-----------------------------------------------------------------+
> > |Applications & Software Development                              |
> > |DM Solutions Group Inc                 http://www.dmsolutions.ca/|
> > +-----------------------------------------------------------------+
> >
> >
> >
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