[Qgis-developer] Digitising icons

Marco Hugentobler marco.hugentobler at karto.baug.ethz.ch
Wed Jan 23 02:34:51 EST 2008

Hi Christoph,

I agree that it would be more convenient to have the snapping tolerance in 
One thing that I'm not sure about is if, in case of reprojected layers, the 
pixel_distance / layer_distance ratio is constant over the whole map view and 
in each direction. If it is not, then I think it will be problematic to 
specify the tolerance in pixels.


Am Donnerstag 17 Januar 2008 22:54:20 schrieb Christopher Barker:
> Hugentobler Marco wrote:
> >> Lastly, I wondered if the snapping distance in options panel can be
> >> specified as a float
> >
> > Right. The (detailed) snapping distances in the project properties can be
> > double, but the standard tolerances in the options panel not. I'm plan to
> > change that in the next time.
> For that matter, when you're looking at snapping distance for selection
> of a vertex, for example, the distance should really be in pixels, not
> in whatever the coordinate system your data is in. Is this possible now?
> -Chris

Dr. Marco Hugentobler
Institute of Cartography
ETH Zurich
Technical Advisor QGIS Project Steering Committee

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