[mkgmap-dev] reduce_peak_mem_v1.patch

Sat Jan 12 16:26:21 GMT 2013

Regarding polygon draw order. Draw level can be defined in TYP file if one is used. Draw level of sea should be < that of land.

Geoff.

WanMil <wmgcnfg at web.de> wrote:

>> Hi WanMil,
>>
>>  > > Are you still working on the mp_cut branch or do you wait for
>something
>>  > > from me?
>>  > > I assume that the precomp-sea handling will change when the mp
>cut algo
>>  > > changes?
>>  >
>>  > Yes. I have found some problems around tagging in mps that need to
>be
>>  > fixed for the mp_cut branch but I am working on it. I am not
>waiting for
>>  > you. Feel free to create you own CutAlgorithm (the interface
>probably
>>  > will change a bit but that will be no big problem).
>>  >
>>
>>
>> OK, I am sure this is a complex change.
>> Up to now I have no real new algorithm because I am not sure if
>> the new algo should just try to avoid thin areas or if it
>> should try to avoid small areas at all.
>>
>> Another point:
>> I think you wrote that garmin format doesn't support holes in areas,
>but
>> I can't imagine what
>> problem one gets when we just overlay one polygon with
>> one or more other polygons.
>
>One little thing is obvious: When selecting a point on the land area 
>Garmin shows you all stuff at this point and that's:
>Land
>Sea
>
>Another thing is that the order of how data is drawn cannot be defined 
>(as far as I know...). So if you have overlapping polygons it's a kind 
>of luck which polygon is on top of the other.
>
>> I think this is by far the better solution compared to the complex
>algo in
>> cutOutInnerPolygons().
>> I wanted to try it with --generate-sea=polygons, but I am not
>experienced
>> regarding styles and TYP files.
>> My problem: I did not find out what changes are needed in the style
>and
>> what TYP file one needs to try it.
>> It would be great if the wiki could show all needed steps.
>
>I think the only thing you have to do is to add a rule for natural=sea 
>and natural=land in your polygons file.
>
>WanMil
>
>>
>> Ciao,
>> Gerd
>>
>
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