[postgis-commits] svn - r3275 - trunk/liblwgeom

[postgis-commits at postgis.refractions.net]

Author: mcayland
Date: 2008-11-07 06:05:53 -0800 (Fri, 07 Nov 2008)
New Revision: 3275

Modified:
   trunk/liblwgeom/liblwgeom.h
   trunk/liblwgeom/lwgeom_api.c
Log:
Add missing lwgeom_getcurve_inspected() function which is required for some of the latest GBT fixes.


Modified: trunk/liblwgeom/liblwgeom.h
===================================================================
--- trunk/liblwgeom/liblwgeom.h	2008-11-07 13:54:21 UTC (rev 3274)
+++ trunk/liblwgeom/liblwgeom.h	2008-11-07 14:05:53 UTC (rev 3275)
@@ -1281,6 +1281,7 @@
 extern BOX3D *lwcurve_compute_box3d(LWCURVE *curve);
 extern void pfree_curve(LWCURVE  *curve);
 LWCURVE *lwcurve_clone(const LWCURVE *curve);
+extern LWCURVE *lwgeom_getcurve_inspected(LWGEOM_INSPECTED *inspected, int geom_number);
 
 /******************************************************************
  * LWMULTIx and LWCOLLECTION functions

Modified: trunk/liblwgeom/lwgeom_api.c
===================================================================
--- trunk/liblwgeom/lwgeom_api.c	2008-11-07 13:54:21 UTC (rev 3274)
+++ trunk/liblwgeom/lwgeom_api.c	2008-11-07 14:05:53 UTC (rev 3275)
@@ -1153,8 +1153,30 @@
 
 /*
  * 1st geometry has geom_number = 0
+ * if the actual geometry isnt a CIRCULARSTRING, null is returned (see _gettype()).
  * if there arent enough geometries, return null.
+ * this is fine to call on a circularstring
  */
+LWCURVE *
+lwgeom_getcurve_inspected(LWGEOM_INSPECTED *inspected, int geom_number)
+{
+	uchar *sub_geom;
+	uchar type;
+
+	sub_geom = lwgeom_getsubgeometry_inspected(inspected, geom_number);
+
+	if (sub_geom == NULL) return NULL;
+
+	type = lwgeom_getType(sub_geom[0]);
+	if (type != CURVETYPE) return NULL;
+
+	return lwcurve_deserialize(sub_geom);
+}
+
+/*
+ * 1st geometry has geom_number = 0
+ * if there arent enough geometries, return null.
+ */
 LWGEOM *lwgeom_getgeom_inspected(LWGEOM_INSPECTED *inspected, int geom_number)
 {
 	uchar *sub_geom;