[GRASS-dev] vectors invisible if has layer2 but no layer1

Moritz Lennert mlennert at club.worldonline.be
Thu Oct 12 04:04:42 EDT 2006

Maciej Sieczka wrote:
> Hamish wrote:
>> Maciej Sieczka wrote:
>>> I have noticed that if I have a vector that has categories in layer 2
>>> and no cats in layer 1, d.vect by default doesn't display any of the
>>> features, unless I specify layer=2 explicitely.
>>> Try this - create a vector 'map' without categories in any layer.
>>> Display it - you see it, OK. Now add categories into layer 2 only:
>>> v.category in=map out=map_addcat_l2 option=add layer=2
>>> d.erase
>>> d.vect map_addcat_l2
>>> You see nothing. No good. Could that be fixed?
>> I'm not sure it is a bug,
>> d.vect --help
>> ..
>> Parameters:
>> ..
>>         layer   Layer number. If -1, all layers are displayed.
>>                default: 1
>> seems clear to me.
>> are you asking that "-1" be the default?

I would vote against that: I think that layers are already complicated 
to understand, and are mostly used by power users who can use layer=-1 
when they know what they are doing. Making this the default would be the 
road to even more potential confusion IMHO.


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