[mkgmap-dev] shape merger in high-prec-coord branch

Thu Jan 16 19:49:07 GMT 2014

Hi Gerd,

good! This is the first part of my idea.
Additionally I thought about what you have written as TODO: maybe better 
merge here? I think when cutting multipolygons it often happens that 
there are parts cut off that needn't be cut.
I have attached a screenshot of a sea tile where I have colored some 
polygons in blue that could be merged to one big polygon. Maybe there is 
an advantage that some of the small cuts do not disappear on lower zoom 
levels because they belong to a bigger polygon.

But I am not sure if that isn't already solved by your changes.

WanMil

> Hi WanMil,
>
> please check the changes in r2970 reg. MultiPolygonRelation.
> Is this the change you had in mind?
>
> Gerd
>
>  > Date: Wed, 15 Jan 2014 21:55:17 +0100
>  > From: wmgcnfg at web.de
>  > To: mkgmap-dev at lists.mkgmap.org.uk
>  > Subject: Re: [mkgmap-dev] shape merger in high-prec-coord branch
>  >
>  >
>  > > I think the artifacts are created by the rounding that happens
>  > > when we convert from or to java.awt.geom.Area.
>  >
>  > Yes. After the multipolygon splitting only the first and the last point
>  > of a common edge of two polygons can be a point that is added
>  > artificially. It sounds possible to detect if it ca be removed.
>  >
>  > WanMil
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>
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