[mkgmap-dev] [Patch v2] higher precision in coordinates

Thu Nov 7 15:46:19 GMT 2013

Hi WanMil,

WanMil wrote
> looks great! I didn't test it carefully but it seems to be safe to be 
> commited.

I started a new branch called high-prec-coord.
So far I tried to use the higher precision also in the 
routines that use java.awt.geom.Area.
Unfortunately, this gives drastically higher 
run times (e.g. in the PrecompSeaGenerator),
and I saw no improvements, but new errros
(e.g. islands written as sea and as land).

I assume the higher CPU time is caused by the
fact that the internal data structures are able to
simplify the rounded coordinates (they probably remove
spikes and points on straight lines), with the higher
precision this is less likely, and therefore all 
routines like intersects() or contains() have to
check more points.

I still hope to be able to use the higher precision
to remove some artifacts like ugly roundabouts...

Gerd

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