[QGIS-trac] [Quantum GIS] #1313: scale indication changes in unexpected amounts on map canvas resize

[Quantum GIS]

#1313: scale indication changes in unexpected amounts on map canvas resize
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   Reporter:  smizuno                          |              Owner:  nobody       
       Type:  bug                              |             Status:  new          
   Priority:  minor: annoyance or enhancement  |          Milestone:  Version 1.0.0
  Component:  MapCanvas                        |            Version:  HEAD         
   Keywords:                                   |   Platform_version:               
   Platform:  All                              |           Must_fix:  No           
Status_info:  0                                |  
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 When the map canvas size is changed by QGIS window being resized or
 splitter bar movement the indicated scale gradually decreases for a while,
 then jumps to a larger scale while dragging the mouse. In a somewhat
 similar way, decreasing the canvas width results in a scale value which
 stays the same for a while and then jumps to a smaller scale.

 I have found that QgsScaleCalculator::calculate() uses integer divide on
 the canvas width, dpi values as they are both integers. This calculation
 should be in floating point.

 The patch attached uses an explicit cast to double for both values to fix
 this problem.

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Ticket URL: <https://trac.osgeo.org/qgis/ticket/1313>
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