[postgis-tickets] [PostGIS] #1498: ST_CrossProduct ?

[PostGIS]

#1498: ST_CrossProduct ?
-------------------------+--------------------------------------------------
 Reporter:  strk         |       Owner:  pramsey       
     Type:  enhancement  |      Status:  new           
 Priority:  low          |   Milestone:  PostGIS Future
Component:  postgis      |     Version:  trunk         
 Keywords:               |  
-------------------------+--------------------------------------------------

Comment(by remic):

 For the record,

 I first wrote a version that used topology node (instead of edge geom
 node).
 However SignedArea of linked toplogy node was a bad IsCCW detector because
 it returned 0 in some simple case(2 edges forming a square = 2 nodes, 0
 area, but can be CW or CCW depending on the order).
 However with a robust function isCCW(point1, point2, point3), I could
 write a faster version that does't use the edge geom (and would return
 only orientation, not signed area)
 .

 Cheers,
 Rémi-C

-- 
Ticket URL: <http://trac.osgeo.org/postgis/ticket/1498#comment:12>
PostGIS <http://trac.osgeo.org/postgis/>
The PostGIS Trac is used for bug, enhancement & task tracking, a user and developer wiki, and a view into the subversion code repository of PostGIS project.