[QGIS-trac] Re: [Quantum GIS] #1421: WFS Extension doesn't request displayed extent using bbox

[Quantum GIS]

#1421: WFS Extension doesn't request displayed extent using bbox
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        Reporter:  mlechner                          |         Owner:  nobody               
            Type:  enhancement                       |        Status:  new                  
        Priority:  major: does not work as expected  |     Milestone:  Version 1.1.0        
       Component:  Data Provider                     |       Version:  HEAD                 
      Resolution:                                    |      Keywords:  WFS bbox bounding box
Platform_version:                                    |      Platform:  All                  
        Must_fix:  No                                |   Status_info:  0                    
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Changes (by mhugent):

  * platform:  Debian => All
  * type:  bug => enhancement
  * must_fix:  Yes => No
  * component:  Vectors => Data Provider
  * milestone:  Version 1.0.0 => Version 1.1.0

Comment:

 Hi Marco

 The WFS provider fetches the whole layer the first time and stores all in
 memory. Because it assumes that the user soon will do some panning and
 zooming and that will be a lot faster if everything is in memory. So the
 implemented solution requires more memory but is much faster for many zoom
 and pan actions.

 And if a WFS layer is the first one, QGIS would need to fetch the whole
 layer anyway.

 However, it could be a feature enhancement to give the user the
 possibility to only request the data in the current view extent (those
 features then would stay the same even if the user pans or zooms out
 afterwards). I'm therefore changing this ticket into enhancement (and
 category 'data provider')

 Marco

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Ticket URL: <https://trac.osgeo.org/qgis/ticket/1421#comment:1>
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