[postgis-devel] [PostGIS] #413: ST_OffsetCurve

[PostGIS]

#413: ST_OffsetCurve
--------------------------+-------------------------------------------------
  Reporter:  rafalmag     |       Owner:  strk         
      Type:  enhancement  |      Status:  assigned     
  Priority:  medium       |   Milestone:  PostGIS 2.0.0
 Component:  postgis      |     Version:  1.5.X        
Resolution:               |    Keywords:               
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Comment (by rafalmag):

 Ok. I produced a new patch ({{{postgis-offsetCurve-RafalMagda.patch}}}).
 It applies to latest trunk.

 arguments:[[BR]]
 - geom[[BR]]
 - distance (float) [[BR]]
 - 'right' or 'left'[[BR]]
 - (optional) parameters 'join=' and 'mitre_limit=' (like in St_Buffer
 (without endcap) )[[BR]]

 Example of use:
 {{{
 select ST_AsText(ST_OffsetCurve(
 ST_GeomFromText('LINESTRING(10 10,10 20, 20 20 )'),
 1,'right', 'join=mitre mitre_limit=5.0'));
 --------------
 LINESTRING(20 19,11 19,11 10)

 select ST_AsText(ST_OffsetCurve(
 ST_GeomFromText('LINESTRING(10 10,10 20, 20 20 )'),
 1,'left', 'join=mitre mitre_limit=5.0'));
 --------------
 LINESTRING(9 10,9 21,20 21)
 }}}

 PS: Tested build with GEOS 3.2.0. Untested build with GEOS 3.1 - see code.

-- 
Ticket URL: <http://trac.osgeo.org/postgis/ticket/413#comment:7>
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