[mkgmap-dev] if-then-else in style and style options

Tue Mar 7 14:40:40 GMT 2017

I'm sorry Gerd, I want to experiment with the new statements but I just
don't have the time to play at the moment. Please commit the changes if you
haven't already, and I'll get the new version and experiment when I can.

Dave

On Tue, Mar 7, 2017 at 9:09 PM, Gerd Petermann <
GPetermann_muenchen at hotmail.com> wrote:

> Any feedback on this?
>
> If nobody is interested in using if-then-else in style I'd be happy to use
> only the style-option_v3.patch
> for trunk.
>
> Gerd
> ________________________________________
> Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag von
> Gerd Petermann <GPetermann_muenchen at hotmail.com>
> Gesendet: Mittwoch, 1. März 2017 15:54:02
> An: mkgmap-dev at lists.mkgmap.org.uk
> Betreff: [mkgmap-dev] if-then-else  in style and style options
>
> Hi all,
>
> I've applied the style-option_v3.patch to the branch, for details see  log
> message:
> http://www.mkgmap.org.uk/websvn/revision.php?repname=mkgmap&rev=3827
>
> I've also tried to fix the known problems with the interpretation of if
> then statements,
> so I hope it works now:
> http://www.mkgmap.org.uk/websvn/revision.php?repname=mkgmap&path=%2F&
>
> Just to make this clear: The if statements are translated to "normal"
> rules, so you cannot do anything
> with if-then which would not work without, you should also not (yet)
> exprect run time improvements.
> The advantage is that you don't have to repeat phrases.
>
> A complex sample that shows a possible usage.
> # Roundabouts
> if (junction=roundabout) then
>         if (mkgmap:option:single-roundabout=true) then
>                 (highway=trunk | highway=trunk_link) [0x0c road_class=4
> road_speed=2 resolution 18]
>                 (highway=primary | highway=primary_link) [0x0c
> road_class=3 road_speed=2 resolution 19]
>                 (highway=secondary | highway=secondary_link) [0x0c
> road_class=2 road_speed=2 resolution 20]
>                 (highway=tertiary | highway=tertiary_link) [0x0c
> road_class=1 road_speed=1 resolution 21]
>         else
>                 (highway=trunk | highway=trunk_link) [0x0c road_class=4
> road_speed=2 resolution 24 continue]
>                 (highway=trunk | highway=trunk_link) [0x10801 resolution
> 18]
>
>                 (highway=primary | highway=primary_link) [0x0c
> road_class=3 road_speed=2 resolution 24 continue]
>                 (highway=primary | highway=primary_link) [0x10802
> resolution 19]
>
>                 (highway=secondary | highway=secondary_link) [0x0c
> road_class=2 road_speed=2 resolution 24 continue]
>                 (highway=secondary | highway=secondary_link) [0x10803
> resolution 20]
>
>                 (highway=tertiary | highway=tertiary_link) [0x0c
> road_class=1 road_speed=1 resolution 24 continue]
>                 (highway=tertiary | highway=tertiary_link) [0x10804
> resolution 21]
>         end
>         # minor roundabouts need no overlay
>         (highway=unclassified | highway=minor ) [0x0c road_class=1
> road_speed=1 resolution 21]
>         highway=* [0x0c road_class=0 road_speed=1 resolution 22]
> end
>
> If the corresponding block in the default style lines file is replaced
> with these rules, you can
> use option --style-option=single-roundabout to enable the rules which
> don't add 0x180x lines as overlays for roundabouts.
>
> It might be possible to completely remove rules which would never be
> triggered but that is quite complex, so I leave that for later.
>
> Gerd
> _______________________________________________
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>

-- 
Dave Swarthout
Homer, Alaska
Chiang Mai, Thailand
Travel Blog at http://dswarthout.blogspot.com
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