[postgis-devel] [PostGIS] #1251: Enhance ST_Rotate by adding offset origin parameters

PostGIS trac at osgeo.org
Mon Oct 24 05:30:54 PDT 2011

#1251: Enhance ST_Rotate by adding offset origin parameters
 Reporter:  mwtoews      |       Owner:  pramsey      
     Type:  enhancement  |      Status:  new          
 Priority:  medium       |   Milestone:  PostGIS 2.0.0
Component:  postgis      |     Version:  trunk        
 Keywords:               |  
 Provide ST_Rotate functions that allow offset origin parameters. The
 current/default rotation behaviour, rotates geometries from the origin
 POINT(0 0), which has limitations with geographic or UTM coordinates. This
 enhancement is to allow the reference origin point to be specified as
 either a POINT geometry or a set of X and Y coordinate values:
 ST_Rotate(geometry geomA, float8 rotRadians, float8 x0, float8 y0);
 ST_Rotate(geometry geomA, float8 rotRadians, geometry pointOrigin);

 Functions, such as ST_MinimumBoundingCircle can be updated to use the new
 functionality, as it currently uses a more complicate method with multiple
 subcalls to ST_Affine.

Ticket URL: <http://trac.osgeo.org/postgis/ticket/1251>
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