[QGIS-trac] [Quantum GIS] #1123: Ability to edit shared polygon vertices

[Quantum GIS]

#1123: Ability to edit shared polygon vertices
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   Reporter:  springmeyer                       |              Owner:  nobody
       Type:  enhancement                       |             Status:  new   
   Priority:  minor: annoyance or enhancement   |          Milestone:        
  Component:  Digitising                        |            Version:  0.10.0
   Keywords:  polygons, shared vertice editing  |   Platform_version:        
   Platform:  All                               |           Must_fix:  No    
Status_info:  0                                 |  
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 I just posted another feature request in ticket 1122, which provides a bit
 of background on the use of qgis for creation and editing of data that
 employs shared polygon topology.

 In these circumstances qgis works great to create the polygon data. One
 simply needs to create a large vector of the entire extent of the area of
 interest and then use the 'Split Features' tool to cut up the one large
 polygon into individual vectors ( THANKS to whomever created the split
 features tool!)

 However, qgis would benefit in its ability to modify polygon data with
 adjacent vertices by the addition of the ability to edit shared vertices.
 Mapwindow's default shapefile editor works like this whereby it
 automatically treats shared vertices between adjacent polygons as the same
 node (must be some min tolerance setting to assume 'sharedness'), thus
 when the user selects a shared vertice and moves the location both
 boundaries of each polygon are effectively edited. This is incredibly
 important for maintaining correct topology of polygon data.

 I'm sure my terminology here can be improved so I would be glad to
 resubmit this ticket with modifications to the wording, just let me know.

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Ticket URL: <https://trac.osgeo.org/qgis/ticket/1123>
Quantum GIS <http://qgis.org>
Quantum GIS is an Open Source GIS viewer/editor supporting OGR, PostGIS, and GRASS formats