[mkgmap-dev] Commit: r1409: Add support for generating multiple map objects from a single OSM object.

Sat Nov 28 21:49:27 GMT 2009

Charlie wrote:
> Clinton Gladstone wrote:
>   
>> On Nov 28, 2009, at 10:50, Christoph Wagner wrote:
>>
>>   
>>     
>>> svn commit schrieb:
>>>     
>>>       
>>>> Version 1409 was commited by markb on 2009-11-27 20:52:16 +0000 (Fri, 27 Nov 2009) 
>>>>
>>>> Add support for generating multiple map objects from a single OSM object.
>>>>
>>>> The style system is augmented with 'continue' and 'stop' commands that
>>>> can be used in style rule files to facilitate the generation of more than
>>>> one map object (line or POI) from a single OSM object.
>>>>
>>>>       
>>>>         
>>> Sounds very cool. Can you give a full example how to use the continue and stop commands, please?
>>> Is it something like this or am I wrong?
>>>     
>>>       
>> Here is an example:
>>
>> tunnel=* [0x12 resolution 20 continue]
>>
>> This would create a second line which you could use (with an appropriate typ file) to create a special overlay for all lines which have the tunnel tag defined. (This is theoretically a bad example, because lines with the tag tunnel=no would also be included, but this gives you an idea of how the feature should work).
>>   
>>     
> Just to clarify: this doesn't create a second line does it?  I thought 
> it just allows separate rules to match the same OSM object?  Or have I 
> misunderstood?  I thought it was the overlays style file that creates 
> copies of an OSM way so that you can apply different TYP styles to a 
> single OSM object.
>
>   
It allows a rule to match again the same object. So you can create 
several lines from one way based on different keys.

So instead of having:
highway=way & brides=yes [0x123}
 - - - with 0x123 specifying several types

you could use use
bridge=yes [0x10a00 resolution 22 continue]
highway=way [0x01 road_class=0 road_speed=1 resolution 20]

This has the advantage of not needing to use bridge=yes for any 
combination in which it could be used. Note, currently ways using 
continue should not be routable - otherwise you it gets really complicated.

Also you cannot use
bridge=yes [0x01 continue]
bridge=yes [0x02 road_class 0 road_speed=0]
-- the check for tags needs to be different, otherwise the second gets 
dropped even though continue flag was used.
> Charlie
>
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