[QGIS-trac] [Quantum GIS] #3768: print composer & wms layers (max size)

[Quantum GIS]

#3768: print composer & wms layers (max size)
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   Reporter:  lutra                             |              Owner:  mhugent      
       Type:  enhancement                       |             Status:  new          
   Priority:  major: does not work as expected  |          Milestone:  Version 1.7.0
  Component:  Printing                          |            Version:  Trunk        
   Keywords:                                    |   Platform_version:               
   Platform:  All                               |           Must_fix:  No           
Status_info:  0                                 |  
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 When printing a layout that contains a WMS layer QGIS warns the user that
 some servers (such UMN Mapserver) only serve images of a certain size, so
 if the map size in the layout is bigger than the size allowed the
 resulting pdf/print will show a white rectangle.

 The workarounds are two:

 *) lower the number of DPIs, but this will produce obviously prints with a
 lower quality

 *) (if you have control over the server configuration) allow the server to
 serve bigger images: this is not really a optimal solution because usually
 people does not own the wms server they need to use and also because
 allowing the server to serve bigger image can be a problem in public wms
 services.

 Other GIS (both proprietary and OS) packages seems to not suffer of this
 limitation as one can print large formats with WMS layers in it, even if
 the server is configured to serve small images.

 Looking into the PDFs produced by this packages it results that the
 printed map from the WMS server is tiled, making clear what kind of
 workaround is used.

 It will be nice in the future to have this feature in QGIS.

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Ticket URL: <https://trac.osgeo.org/qgis/ticket/3768>
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