[ka-Map-users] Panning and zooming question

[Jacob Delfos]

Matt (and rest),

I think in its current implementation, you would indeed not be able to zoom to the exact extent of a bounding box. You would have three options:

- infinite number of scales, as mentioned (not really an option)
- approximate (zoom to nearest scale), which would probably end up differing significantly from the actual extent of the bounding box
- scaling the tiles; you'd have to use tiles which are of the nearest higher resolution (larger scale), and apply a scaling to them on the client side, by displaying the images at a certain percentage of their original size. This could end up being slower and uglier, though. Internet explorer uses nearest-neighbour resampling.... 

Jacob





-----Original Message-----
From: ka-map-users-bounces at lists.maptools.org [mailto:ka-map-users-bounces at lists.maptools.org] On Behalf Of Matthew Perry
Sent: 31 May 2005 15:17
To: Gambin Dejan
Cc: ka-map-users at lists.maptools.org
Subject: Re: [ka-Map-users] Panning and zooming question

On 5/30/05, Gambin Dejan <Dejan.Gambin at pula.hr> wrote:
> I think box zooming is not difficult to implement so it shouldn't be a
> problem to contribute. 

Box zooming will introduce major problems on the server side as there
will be a potentially inifinite number of zoom levels. This equates to
a potentially infinite number of tiles and the massive disk space and
processor time used to generate and store these tiles. As ka-map is
already **very** processor intensive, this is not an option for many
of us with a modest hardware budget ;-)

How would you propose to solve these problems? Is box zoom even viable
given the tile model of ka-map??

-- 
Matt Perry
perrygeo at gmail.com
http://www.perrygeo.net

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