[QGIS-trac] Re: [Quantum GIS] #2596: One draw too much on switch off

[Quantum GIS]

#2596: One draw too much on switch off
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   Reporter:  aperi2007                         |              Owner:  nobody       
       Type:  bug                               |             Status:  new          
   Priority:  major: does not work as expected  |          Milestone:  Version 1.7.0
  Component:  MapCanvas                         |            Version:  Trunk        
   Keywords:                                    |   Platform_version:               
   Platform:  All                               |           Must_fix:  No           
Status_info:  1                                 |  
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Changes (by lutra):

  * platform_version:  7 =>
  * platform:  Windows => All
  * milestone:  Version 1.6.0 => Version 1.7.0


Comment:

 I'm able to see what Andrea is saying.

 *) With render caching enabled, then the "number of features to be drawn
 before updating the display" does not work anymore. If you refresh the map
 the vector will be rendered as if the option is set to "0", so I guess
 that it would be needed to disabled this option when the render caching is
 enabled.

 *) With the render caching is disabled and you choose something different
 from "0" in "number of features to be drawn before updating the display"
 (and you are using a vector with many features, I'm testing myself a 50000
 polygons vector) then the problem is evident.

 Add another (small) vector and then start enabling/disabling it in the
 TOC, the big vector is continuously redrawn at each click... very
 annoying.





 In general without render caching enabled (and "number of features to be
 drawn before updating the display" set to 0), enabling/disabling a vector
 in a project where there are many others vectors, or a few big ones, it
 takes really a lot.

 I'm on trunk/ubuntu 10,04 and with the render caching enabled, on the
 contrary, it works really smooth.

 It the options enabled by default?

-- 
Ticket URL: <http://trac.osgeo.org/qgis/ticket/2596#comment:4>
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