[mkgmap-dev] 4179

Mon May 17 07:09:23 BST 2021

This in referring the the commit message. I think mkgmap in that case
simply should not reverse the lines at all.
I did not know that --allow-reverse-merge will be able to reverse them
again. But yes I think mkgmap could skip reversing such lines. Meaning only
look at oneway status for lines that are on the line--types-with-direction
list or routable. Doing that in style is rather complicated, and likely
using quite a lot of CPU cycles too.

On Mon, 17 May 2021 at 13:43, Gerd Petermann <
gpetermann_muenchen at hotmail.com> wrote:

> Hi Felix,
>
> "this is only needed ..."  what exactly refers "this" to?
>
> oneway=-1 requires a reversing of roads because the IMG format doesn't
> allow to store the information that it is a reversed oneway.
>
> The current code checks the oneway tag first. It does this since r2944,
> see https://www.mkgmap.org.uk/websvn/revision.php?repname=mkgmap&rev=2944
> It's probably not needed for lines without a direction and it might safe a
> few cpu cycles to avoid that reversing. Anyhow, with --allow-reverse-merge
> the order of points in lines without direction might be reversed again.
>
> Gerd
>
> ________________________________________
> Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag von
> Felix Hartmann <extremecarver at gmail.com>
> Gesendet: Montag, 17. Mai 2021 04:52
> An: Development list for mkgmap
> Betreff: [mkgmap-dev] 4179
>
> Hi Gerd
>
> oneway tag no longer influences the direction flag of non-routable lines.
> Note that oneway=-1 still means line is reversed and oneway=yes is set.
>
> I think this is only needed if the linetype is listed under
> --line-types-with-direction
> If not listed here nor routable oneway=-1 is as irrelevant as oneway=yes
>
> I do not understand why we would have different handling of onway=yes and
> oneway=-1
> Reversing the road should not be needed because it does not matter for the
> layout, nor for the routing.
> --
> Felix Hartman - Openmtbmap.org & VeloMap.org
>
> _______________________________________________
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> mkgmap-dev at lists.mkgmap.org.uk
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>

-- 
Felix Hartman - Openmtbmap.org & VeloMap.org
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