[mkgmap-dev] draw-priority and layers

Sun Aug 30 09:15:42 BST 2009

you don't give enough details.
has each layer it's own map id?
BTW EACH layer that is supposed to look different needs it's own TYPfile 
(does not have to be different, but for each mapID the name (up to 8 
characters no more) of the typfile must be different).

If you use gmaptool to create gmapsupp.img, is the result working? If 
yes then mkgmap really has a bug, if not you're process is wrong.

frmas wrote:
> Hi,
>
> I'm trying to build a map with different layers, but I guess something
> is wrong with the draw-priority parameter or the way i use it.
>
> 4 layers :
>
> - Layer 1 : Contour line.
>             draw-priority=25 (the highest).
>             Transparent
>             Specific style (contour) - the style is just (actually):
>             natural=coastline [0x15 resolution 12]
>             I generate a gmapsupp.img file
>
> - Layer 2 : Personal data
>             draw-priority=20 (a little less than layer 1).
>             Transparent
>             Specific style (perso)
>             I generate a gmapsupp.img file
>
> - Layer 3 : Normal OSM map.
>             draw-priority=10 (the highest).
>             NO Transparency (of course)
>             Specific style (perso)
>             I generate a gmapsupp.img file
>
> - Layer 4 : Search map (with the road-name-pois parameter).
>             draw-priority=1 (the lowest).
>             No specific style.
>             I generate a gmapsupp.img file
>
> So I should have :
>
> layer 1 (contour) : - - - - - - - - - - - - - - - - - - -
> layer 2 (personal : - - - - - - - - - - - - - - - - - - -
> layer 3 (normal)  : -------------------------------------
> layer 4 (search)  : -------------------------------------
>
> So, layers 1, 2 and 3 should be visible, not layer 4 as below a non
> transparent layer.
>
> Now, when I mix all those gmapsupp files (I rename all of them of
> course) plus the two .TYP files (PERSO and CONTOUR), I have different
> results depending the way I place them on the command line.
>
> 1) ex: mkgmap gmapsupp_layer1 gmapsupp_layer2 gmapsupp_layer3
> gmapsupp_layer4 CONTOUR.TYP PERSO.TYP
>
> makes layer2 not visible. The map displayed seems to use a default style.
>
> 2) ex: mkgmap gmapsupp_layer4 gmapsupp_layer2 gmapsupp_layer1
> gmapsupp_layer4 CONTOUR.TYP PERSO.TYP
>
> makes layer1 not visible. I don't know which style it uses, none of mine
> at least.
>
> 3) Now if I compile layer1 with my "perso" style and if I remove the
> CONTOUR.TYP file from the gmapsupp generated at the end of the process,
> my perso style is again not used, and I have always one of the layers,
> not displayed.
>
> Maybe I do something wrong here, but I do not understand from the tests
> I made and results I have how the draw-priority works. Francois
>
> P.S. I tried all possible orders, but I never got a good result.
>   