[QGIS-trac] Re: [Quantum GIS] #1597: Default sorting of data

[Quantum GIS]

#1597: Default sorting of data
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        Reporter:  mwtoews                          |         Owner:  nobody
            Type:  enhancement                      |        Status:  new   
        Priority:  minor: annoyance or enhancement  |     Milestone:        
       Component:  Data Provider                    |       Version:  HEAD  
      Resolution:                                   |      Keywords:        
Platform_version:                                   |      Platform:  All   
        Must_fix:  No                               |   Status_info:  0     
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Comment (by mwtoews):

 Replying to [comment:1 gsherman]:
 > Why is it important what order the features are drawn?

 This is important for data that happens to pile up in the same or similar
 place. I can think up two good examples:

 Time-variable data, for example polygons of building outlines. I would
 like to draw the oldest buildings first followed by the newer ones. This
 way, the current (or at least most recent) buildings are on top. I have
 layers of buildings that stretch back into the 1940s, many of which have
 been demolished with new ones built in the same areas.

 Symbol levels for points. I often have multiple points at one location
 that is stylized using the unique value symbology. There are certain
 symbols (such as "contaminated" red dot) that are more critical to see on
 the map than others (such as "not contaminated" green dot).
 (Alternatively, it might make more sense that control of symbol levels
 should be part of the layer properties for unique value symbology --
 especially since it is difficult to sort text classifications unless they
 happen to be alphabetical).

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Ticket URL: <https://trac.osgeo.org/qgis/ticket/1597#comment:2>
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