Changes between Version 13 and Version 14 of UsersWikiplpgsqlfunctions

Timestamp:

09/10/09 14:05:21 (15 years ago)

Author:

bcrosby

Comment:

--

UsersWikiplpgsqlfunctions

@@ -26 +26 @@
         endpointutm := st_transform(endpoint,utmzone(endpoint));
 
-        midpointrads := abs(st_azimuth(startpointutm,arcenterutm) - st_azimuth(endpointutm,arcenterutm))/2;
+        midpointrads := abs(st_azimuth(arcenterutm,startpointutm) - st_azimuth(arcenterutm,endpointutm))/2;
         IF direction = 'cw' THEN thedirection := -1*midpointrads; ELSE thedirection := midpointrads; END IF;
         pointonarc := ST_Translate( ST_Rotate( ST_Translate( startpointutm, -1*ST_X(arcenterutm), -1*ST_Y(arcenterutm)), thedirection), ST_X(arcenterutm), ST_Y(arcenterutm));
@@ -34 +34 @@
   $$
   LANGUAGE 'plpgsql' IMMUTABLE;
-  COMMENT ON FUNCTION st_createarc(geometry,geometry,geometry,text) IS 'Generates an arc based on starting point, ending point, centre of arc, and direction (clockwise: 'cw', counter-clockwise: 'cc'). All geometries must be of type POINT and this function returns a linestring of the arc based on the original SRID and 32 points per quarter circle. Requires the utmzone function.'; 
+  COMMENT ON FUNCTION st_createarc(geometry,geometry,geometry,text) IS 'Generates an arc based on starting point, ending point, centre of arc, and direction (clockwise: \'cw\', conter-clockwise: \'cc\'). All geometries must be of type POINT and this function returns a linestring of the arc based on the original SRID and 32 points per quarter circle. Requires the utmzone function.'; 
+
 
 }}}