[QGIS-trac] [Quantum GIS] #1963: "Ghost Lines" when using Anti-aliasing, polygons with shared boundaries, and no outline/QT::NoPen

[Quantum GIS]

#1963: "Ghost Lines" when using Anti-aliasing, polygons with shared boundaries,
and no outline/QT::NoPen
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   Reporter:  springmeyer                             |              Owner:  nobody
       Type:  bug                                     |             Status:  new   
   Priority:  major: does not work as expected        |          Milestone:        
  Component:  MapCanvas                               |            Version:  HEAD  
   Keywords:  anti-aliasing,nopen,shared,polygons,2x  |   Platform_version:        
   Platform:  All                                     |           Must_fix:  No    
Status_info:  0                                       |  
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 QT's anti-aliasing output exhibits an inherent limitation of AA, where
 polygon edges are drawn/feathered twice and the background color "bleeds"
 through what are supposed to be tightly shared edges of polygons.

 I wonder if some of the new render hints in QT4.4 > might help work around
 this issue:

 http://doc.trolltech.com/4.5/qpainter.html#RenderHint-enum

 See also: http://trac.mapnik.org/ticket/428, where I am working on a
 workaround using AGG that may apply to the QT renderer, given an exposed
 API.

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Ticket URL: <http://trac.osgeo.org/qgis/ticket/1963>
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