[Qgis-user] vector editing in QGIS - questions and issues (PostGIS biased)

[Micha Silver]

Maciej Sieczka wrote:

> Marco Hugentobler pisze:
> > Maciek wrote:
> >> Marco wrote:
>
>
> Before you read on: NOTICE - I'm assuming that snapping = 0 is no 
> different than snapping "disabled". Is this correct? If it is, maybe 
> it would be better to remove the snapping checkbox for layers and use 
> spinbox with numbers only to simplify the dialog?
>
>> Ok, I see what you mean. In the snapping dialog of the project should 
>> be inserted the default snapping settings (which is snapping to the 
>> active layer with the default snapping tolerance) in case the 
>> snapping dialog was not changed already.
>
> Yes.
>
>> Otherwise, if a user changes any project property and clicks ok, the 
>> snapping will be off for all layers.
>
> I think differently. As long as default QGIS-wide snapping is !=0, all 
> layers which don't have inddividual setting set by the user, should 
> have snapping set on equal to default setting - unless the user 
> manually disables snapping for the given layer.
>
>> I don't think that unchecked layers should automatically have the 
>> default snapping tolerance.
>
> Then what is the point of default snapping setting at all? Look - as 
> long as you don't enter project properties and click OK, the default 
> QGIS snapping is on for all layers in the project. Once you go to 
> project props. and click OK, all snapping is suddenly disabled, 
> although you did not modify any setting related to snapping. Imagine a 
> user trying to guess what happened.
>
In the kind of jobs I do, and what I can imagine others do, I would NOT 
want snapping automatically to all layers, but only the one layer I have 
set to snap. Maybe, as you suggest, there should not be any default 
project snapping setting at all, now that we have snapping for 
individual layers.
> Note also that this was different in QGIS before introducing 
> individual snapping setting per layer. You only had the QGIS-wide 
> snapping setting, which was always active, for all layers. Now as soon 
> as you go to project settings for whatever reason and press OK that 
> snapping is disabled. This should be avoided.
>
>> Because it is possible that a user don't want to snap to some layers 
>> at all.
>
> The user can disable snapping for a certain layer, if he needs to.
>
> Another thing - IMO users more often need snapping than they don't. 
> Help users not to digitize overlapping features by default, eg. 
> promote using snapping rather than not using it. I'd be also in favor 
> of enabling the QGIS "topological editing" feature by default.
>
> What I hate most in GIS are all those overlapping polygons and lines 
> which I have to tediously correct topology for, re-calculate their 
> area and length, explain the vendor what is wrong about his data. 
> Please promote topological practices.
>
> Maciek
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-- 
Micha Silver
Arava Development Co
+972-8-6592270