[QGIS-trac] [Quantum GIS] #3837: new symbology line decoration has wrong orientation when final vertices are duplicated

[Quantum GIS]

#3837: new symbology line decoration has wrong orientation when final vertices are
duplicated
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   Reporter:  strk                              |              Owner:  nobody       
       Type:  bug                               |             Status:  new          
   Priority:  major: does not work as expected  |          Milestone:  Version 1.7.0
  Component:  Symbology                         |            Version:  Trunk        
   Keywords:                                    |   Platform_version:               
   Platform:  Debian                            |           Must_fix:  Yes          
Status_info:  0                                 |  
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 After a long time happyness due to closing ticket #3434 the wrong arrow
 orientation bug is back.

 This time the problem is due to lines having duplicated vertices toward
 the end, so that the "last segment" is empty.

 I hit this bug while testing handling of such cases by postgis topology so
 it was intentional to have lines with endings collapsed.
 Example:

 {{{
 LINESTRING(10 0, 0 0, 0 0)
 }}}

 I haven't checked this specific case but what I'm looking at right now is
 an arrow pointing o the right, so I guess you'd see the same right-
 pointing arrow for the case above (which is instead going to the left).
 Note that the same right-arrow should appear for any line orientation:
 vertical or diagonal...

 Label orientation might be affected too, but didn't try to produce that
 bug (I guess it'd take making it so that centroid of the line falls on a
 collapsed segment)

-- 
Ticket URL: <http://trac.osgeo.org/qgis/ticket/3837>
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