[mkgmap-dev] Commit r4703: improve RoadMerger (based on merge-roads-reversed-v6.patch)

Tue May 11 13:08:23 BST 2021

Hi Gerd, 

No problem with that, but I don't think it should be a hidden option, and
the use of 'force' suggests it will reverse ways that are direction
sensitive. I suggest --allow-reverse-merge and add it to the documentation
stating that if your style includes mkgmap:has_direction is it on by
default. I don't have any direction sensitive ways in my style and hence
will need to use the option.

Cheers,
Mike

-----Original Message-----
From: Gerd Petermann [mailto:gpetermann_muenchen at hotmail.com] 
Sent: 11 May 2021 12:21
To: Development list for mkgmap <mkgmap-dev at lists.mkgmap.org.uk>
Subject: Re: [mkgmap-dev] Commit r4703: improve RoadMerger (based on
merge-roads-reversed-v6.patch)

Hi Mike,

it is off by default because it will cause trouble with some styles / TYP
files which rely on the direction but don't set that the new special tag
(yet).

Gerd

________________________________________
Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag von Mike
Baggaley <mike at tvage.co.uk>
Gesendet: Dienstag, 11. Mai 2021 13:15
An: mkgmap-dev at lists.mkgmap.org.uk
Betreff: Re: [mkgmap-dev] Commit r4703: improve RoadMerger (based on
merge-roads-reversed-v6.patch)

Hi Gerd,

I may be misunderstanding this, but the explanation of when it is enabled
seems illogical.

It seems to me that reversing should be the default except on ways that have
mkgmap:has-direction=true unless a switch is given to disable it.

Or it could be off by default and a switch enables it, except for ways that
have mkgmap:has-direction=true.

Cheers,
Mike

-----Original Message-----
From: svn commit [mailto:svn at mkgmap.org.uk]
Sent: 11 May 2021 11:22
To: mkgmap-svn at lists.mkgmap.org.uk; mkgmap-dev at lists.mkgmap.org.uk
Subject: [mkgmap-dev] Commit r4703: improve RoadMerger (based on
merge-roads-reversed-v6.patch)

Version mkgmap-r4703 was committed by gerd on Tue, 11 May 2021

improve RoadMerger (based on merge-roads-reversed-v6.patch)
This has two effects:
- it allows RoadMerger to merge roads which build a sharp angle, if that is
done an info message is logged
- it allows RoadMerger to merge roads with different directions be reversing
the order of points if special criteria are met
- implement new special tag mkgmap:has-direction=true which tells mkgmap
that the direction of the way is important and should not be reversed. The
routing tags oneway=yes or oneway=-1 have the same effect, but they also
effect routing. Use this tag if you have a TYP file which renders lines
different (e.g. cycleway on the right or on the left side) to prevent a
reverse merge
- implements new experimental option --x-force-reverse-merge

Merging with reverse produces smaller maps, esp. smaller NET and NOD files,
it may have an influence on routing.
Reversing of roads is disabled unless mkgmap detects that the style has at
least one rule which adds mkgmap:has-direction=true in rule file lines or
option --x-force-reverse-merge is used.
The program checks if any line that was added for a given OSM way has the
tag mkgmap:has-direction=true.
If one is found the tag is propagated to the road(s) for that OSM way so no
reversing happens.
Roads with different direction attributes are not merged.

The option --x-force-reverse-merge is meant for those who don't use a TYP
file or don't render left/right attributes with different types. All others
should not use the option and adapt the style instead.

http://www.mkgmap.org.uk/websvn/revision.php?repname=mkgmap&rev=4703

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