Re: [Libosmscout-development] Mac Question

[Tim T. <ti...@fr...>]

Hello,

> im trying to use libosmscout on MacOSX (10.10.5). I successfully
> compiled most of the libs and OSMScout2. Starting and displaying a map
> on OSMScout2 works but as soon as i start to zoom with the mousewheel
> (apple magic mouse) the map goes blank. Zooming through the MapButtons
> works as well as using keyboard "+" or "-". Panning with mouse also
> works.
>
> When zooming with wheel the output changes from
> Draw: [51.93906 N 12.16316 E - 54.39365 N 14.62068 E] 256x/8 480x800
> 103.00000 DPI
> Paths: 68/68/68/0 (pcs) 0.000/0.000/0.000/0.000 (sec)
> Areas: 0/0/0 (pcs) 0.000/0.000/0.000 (sec)
> Nodes: 6+0/6 (pcs) 0.002/0.000 (sec)
> Labels: 2/0/2 (pcs) 0.001 (sec)
>
> To:
> Draw: [90.00000 S inf W - 90.00000 N inf E] 0x/0 480x800 103.00000 DPI
> Paths: 0/0/0/0 (pcs) 0.000/0.000/0.000/0.000 (sec)
> Areas: 0/0/0 (pcs) 0.000/0.000/0.000 (sec)
> Nodes: 0+0/0 (pcs) 0.000/0.000 (sec)
> Labels: 0/0/0 (pcs) 0.000 (sec)
>
> Is there something i can/should check or something i can do to debug this?

This is not normal behaviour. While recently coding at the Linux Hotel  
at the OSM Sommercamp this bug happened to me a few time, too (Linux,  
64bit, Qt 5.7). The behaviour was not reproducible so I was not able  
to analyse or fix it.

It may be a problem in Qt 5.7 (which version do you have) or in some  
recent change - though IMHO there was no change in this area. It looks  
like a huge number of zoom out events were created leading to the  
magnification being 0. In most cases the map is just blank afterwards.

Any input would be helpful and you can of course make a bug at github  
(preferred) or sourceforge.
-- 
Gruß...
    Tim