Thanks Gerd, that looks great! I have done some code simplifications (see attached version 3 of the patch). Example: Locator: The construct Map<String, ArrayList<MapPoint>> is already implemented as class MultiHashMap<String, MapPoint>. K-D-Tree: Some code duplications could be saved by adding a simple compare method isSmaller(..). (The test case was *very* useful to check the correctness of the modifications). Can you perform a short check on it? Thanks! WanMil
Hi WanMil,
Date: Wed, 7 Mar 2012 20:10:42 +0100 From: wmgcnfg@web.de To: mkgmap-dev@lists.mkgmap.org.uk Subject: Re: [mkgmap-dev] [Patch] Improve Locator
Hi Gerd,
I have commited a modified version of b). I don't use a separate HashMap because the isoMap is already there.
okay, I did not want to touch the original map, but I agree that your version is better
I would also commit the other parts. Please modify the following things: * The K-D-Tree class has a test in the main() method. Please move this to a JUnit test * Please remove the commented old code
done, see attached patch.
Gerd
Thanks WanMil
Hi,
attached patch for the performance branch improves the Locator. a) It uses a kd-tree to implement the findNextPoint() method. This may also be usable in other routines, did not look at this
until now.
The implementation is based on the demo in wikepedia: http://en.wikipedia.org/wiki/K-d_tree wikipedia
The method in MapPointFastFindMap is slower and sometimes the kd-tree finds nearer places.
b) added memoization to LocatorConfig.getCountryISOCode()
http://gis.19327.n5.nabble.com/file/n5531583/locator_v1.patch locator_v1.patch
Gerd
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