Hi Joeles,
The tiled layer does much of the work for you in terms of scrolling
and scaling.
I have an example on my blog;
http://bill.dudney.net/roller/objc/entry/catiledlayer_example
that does something like what you want (I expect based on the
description).
Good luck!
-bd-
http://bill.dudney.net/roller/objc
On Jul 1, 2008, at 3:00 AM, Joeles Baker wrote:
Hi,
I am trying to develop a "map viewer".
Later i'd like to port it to the iPh***, but since we don't talk
about the iPh*** in here,
i'll just start with a basic osx app ;-)
My final goal is to develop a feature equivalent application to the
iPh*** (google) Maps app,
but instead it will use the free and open source maps provided by
the http://www.openstreetmap.org project.
(of course it will be free and i'll provide the community with the
source).
currently i am able to show a specific map part for example like:
http://tile.openstreetmap.org/cgi-bin/export?bbox=11.56832,48.13196,11.5827,48.14255&scale=6800&format=png
but i am a bit stuck with the scrolling and zooming thing.
now if my user scrolls (taps) or zooms, howto dynamically reload map
parts in a iPh*** like fashion?
any pointer or anyone interested in the project and willing to join
forces is greatly appreciated :-)
best,
--Joeles
P.S.:
just in case you wonder, why to use openstreetmap instead of google:
its opensource - you may do whatever you want with the map data
without getting sued by google or their map provider.
openstreetmap is wikipedia for maps - in some areas (where all those
geeks with the gps equipped bicycles are around) openstreetmap
map data is MUCH more accurate than google maps.. evenfootpaths,
bicycle paths... and so on
P.P.S.:
yes, i'll integrate coreloc*****, but we don't talk about coreloc****
P.P.P.S.:
if apple wouldn't provide such a nice toolchain and sometimes even
nice products, currently i'd be really frustrated enough
with all this iphone sim-locking, opensource counterproductive
appstore concept, nda shizzle marketing tactics, ..... to move one
to another platform.
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