[mkgmap-dev] special case where splitting fails without a log message

Thu May 27 15:39:52 BST 2021

Hi Gerd

Found stupid mistake, updated patch attached.

Also, if debug enabled, always splits both sides of the line, and, if
both sides are collected to the same list, just gives 1 gpx trace for
it.

Ticker

On Thu, 2021-05-27 at 10:54 +0000, Gerd Petermann wrote:
> Hi Ticker,
> 
> sounds good. I'm making progress with a better ShapeMerger that
> produces less jitter, but so far it still produces some.
> Will try it later..
> 
> Gerd
> 
> ________________________________________
> Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag
> von Ticker Berkin <rwb-mkgmap at jagit.co.uk>
> Gesendet: Donnerstag, 27. Mai 2021 12:49
> An: Development list for mkgmap
> Betreff: Re: [mkgmap-dev] special case where splitting fails without
> a log message
> 
> Hi Gerd
> 
> I think this can cope with any number of lines, in either/both
> directions, following the same path. Also it should give better
> output
> if same number of lines in both directions.
> 
> With debug, if it notices a problem, it generates a GPX trace of the
> original and traces of all the resultant bits individually in a
> subdirectory relevant to the split line.
> 
> I've tested it on a few examples, but I'll stress-test GBR again and
> check the shapes where it detects problems.
> 
> I probably need to tidy up some message levels and comments.
> 
> Ticker
> 
> On Wed, 2021-05-26 at 11:17 +0100, Ticker Berkin wrote:
> > Hi Gerd
> > 
> > I have to design a shape that does this and think what it means.
> > With
> > the extra handling needed for identical opposite lines it will be
> > easy
> > to detect. Maybe possible to just chuck it.
> > 
> > I'm out for the rest of the day so can't do anything until
> > tomorrow.
> > 
> > Ticker
> > 
> > On Wed, 2021-05-26 at 08:46 +0000, Gerd Petermann wrote:
> > > Hi Ticker,
> > > 
> > > OK, I think your patch improves some cases. I've also fixed
> > > another
> > > potential cause for these problems with r4744.
> > > 
> > > I think I have to find a way to avoid those segments which are
> > > visited multiple times in the same direction. There's probably
> > > always
> > > an alternative merge order that avoids this.
> > > 
> > > Gerd
> > 
> > _______________________________________________
> > mkgmap-dev mailing list
> > mkgmap-dev at lists.mkgmap.org.uk
> > https://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev
> _______________________________________________
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