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[mkgmap-dev] mkgmap creates polygons that break Mapsource panning and also routing in some zoomlevels as well as crashing the GPS

From Mark Burton markb at ordern.com on Fri Sep 4 10:18:40 BST 2009

Hi Felix,

> Well one thing that this patch makes, is much much bigger filesize 
> (around 30% increase).

To be expected.

> Furthermore it really crashes Mapsource. Not even possible to move out 
> anymore.

Hmm, not so expected.

> After panning around a bit and choosing a well working zoomscale, 
> Mapsource moves not to the well working one, but out at 1000km
> After panning around at 7km just one step before the "critical" 5km 
> Mapsource crashed completely: Crashlog (mapsourcecrash.txt) is attached.
> If there is no huge error in this patch, it was the worst that ever 
> happened.
> Also now Mapsource 6.15.6 shows no more tile and eventually crashes. 
> mapsource 6.15.6 crashlog is attached too.
> Maybe reversing the patch and increasing subdivision size would help?

That's an interesting idea - the attached patch should reduce the
number of subdivisions - the original code split a subdivision into 4
pieces when it needed splitting. This patch splits it into 2. See what


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