[mkgmap-dev] why do we have mkgmap:road-speed-class ?

Sat Dec 28 11:45:17 GMT 2013

Hi Gerd,

it would be possible to print a warning (implemented in the 
addtagaction) but maybe it is better to add a new action like
highway=secondary {set mkgmap:road-speed=3}
highway=* & surface=gravel { modroadspeed=-1}
highway=* & tunnel=yes { modroadspeed=-1}

The modroadspeed action implements adding the values to the 
mkgmap:road-speed tag.

WanMil

> Hi WanMil,
>
> okay, now I got it.
> Would it be possible to print a warning when a
> style uses something like
> highway=secondary {set mkgmap:road-speed=3}
> highway=* & surface=gravel {set mkgmap:road-speed=-1}
> highway=* & tunnel=yes {set mkgmap:road-speed=-1}
>
> For a way with highway=secondary,surface=gravel,tunnel=yes the
> resulting speed would be 2 (3-1), but the user probably expects 1 (3-1-1).
>
> Gerd
>
>  > Date: Sat, 28 Dec 2013 10:52:54 +0100
>  > From: wmgcnfg at web.de
>  > To: mkgmap-dev at lists.mkgmap.org.uk
>  > Subject: Re: [mkgmap-dev] why do we have mkgmap:road-speed-class ?
>  >
>  > lines:
>  > include 'inc/roadspeed';
>  > highway=* & lanes > 2 { set mkgmap:road-speed=+1 }
>  >
>  > The roadspeed include sets the road speed. After that you need a 2nd tag
>  > to modify the road speed.
>  >
>  > WanMil
>  >
>  > > Hi WanMil,
>  > >
>  > > I still don't understand. Please give an example where
>  > > mkgmap:road-speed-class has to be used because mkgmap:road-speed
>  > > will not work.
>  > >
>  > > Gerd
>  > >
>  > >
>  > > > Date: Sat, 28 Dec 2013 09:20:20 +0100
>  > > > From: wmgcnfg at web.de
>  > > > To: mkgmap-dev at lists.mkgmap.org.uk
>  > > > Subject: Re: [mkgmap-dev] why do we have mkgmap:road-speed-class ?
>  > > >
>  > > > > Hi WanMil,
>  > > > >
>  > > > > I fear I don't understand the meaning of this new tag.
>  > > > > Docu says:
>  > > > > "A value between 0 and 7. Overrides the road_speed definition
> in the
>  > > > > element type definition if this tag is set."
>  > > > >
>  > > > > We have mkgmap:road-speed which allows to increment, decrement or
>  > > override
>  > > > > the road speed value in the element type definition.
>  > > > > Why did you introduce this new tag?
>  > > >
>  > > > mkgmap:road-speed already was already used so I could not just change
>  > > > its meaning.
>  > > > mkgmap:road-speed-class defines the speed classification whereas
>  > > > mkgmap:road-speed can define or modify a speed classification.
> But how
>  > > > do you want to modify an already set classification? That's not
> possible
>  > > > in the style because you don't have arithmetic expressions.
>  > > > That results in having mkgmap:road-speed-class which defines
> speed class
>  > > > (or better overrides the class defined in the GType) and a modifier
>  > > > mkgmap:road-speed. I propose to use mkgmap:road-speed as modifier
> only
>  > > > (prefixed with +-) but I could not remove the usage without
> prefixed +-
>  > > > because that would break existing style sheets.
>  > > >
>  > > > WanMil
>  > > >
>  > > > >
>  > > > > Gerd
>  > > > >
>  > > >
>  > > > _______________________________________________
>  > > > mkgmap-dev mailing list
>  > > > mkgmap-dev at lists.mkgmap.org.uk
>  > > > http://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev
>  > >
>  > >
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>  > >
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