[mkgmap-dev] polygon type 0x4a

Wed May 29 09:48:14 BST 2013

Hi Nick,

up to now the routine that creates the overview map doesn't add a 0x4b polygon,
but normally, the tiles contain 0x4b polygons, and those are added.
I think you are right that this can lead to problems if the combined tiles don't
form a rectangle, so I should probably change the code so that the 
existing 0x4b polygons are ignored and a final new one is calculated.

Gerd

> Date: Tue, 28 May 2013 23:42:40 -0700
> From: osm at pinns.co.uk
> To: mkgmap-dev at lists.mkgmap.org.uk
> Subject: Re: [mkgmap-dev] polygon type 0x4a
> 
> Hi Gerd
> 
> This might have nothing to do with the issue but I've been curious why all
> basemaps ( in the past) & now overview maps cause Mapsource & Basecamp to
> crash when the tdb  lock byte is set.
> This interestingly does not happen when cgpsmapper is used to create the
> basemap . One of the differences seems to be that the latter includes a 0x4b
> polygon to define the outline.(+ Background=Y)
> Am I correct that  the main outline / frame (4b polygon) is not defined  as
> such but presumably calculated by Mapsource? This might lead to unwanted
> effects?
> 
> BW the overview maps work really well with reduced map windows.
> 
> .. Nick
> 
> 
> 
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