PostGIS  3.1.6dev-r@@SVN_REVISION@@

◆ lwgeom_startpoint()

int lwgeom_startpoint ( const LWGEOM lwgeom,
POINT4D pt 
)

Definition at line 2112 of file lwgeom.c.

2113 {
2114  if ( ! lwgeom )
2115  return LW_FAILURE;
2116 
2117  switch( lwgeom->type )
2118  {
2119  case POINTTYPE:
2120  return ptarray_startpoint(((LWPOINT*)lwgeom)->point, pt);
2121  case TRIANGLETYPE:
2122  case CIRCSTRINGTYPE:
2123  case LINETYPE:
2124  return ptarray_startpoint(((LWLINE*)lwgeom)->points, pt);
2125  case POLYGONTYPE:
2126  return lwpoly_startpoint((LWPOLY*)lwgeom, pt);
2127  case TINTYPE:
2128  case CURVEPOLYTYPE:
2129  case COMPOUNDTYPE:
2130  case MULTIPOINTTYPE:
2131  case MULTILINETYPE:
2132  case MULTIPOLYGONTYPE:
2133  case COLLECTIONTYPE:
2134  case POLYHEDRALSURFACETYPE:
2135  return lwcollection_startpoint((LWCOLLECTION*)lwgeom, pt);
2136  default:
2137  lwerror("lwgeom_startpoint: unsupported geometry type: %s", lwtype_name(lwgeom->type));
2138  return LW_FAILURE;
2139  }
2140 }
#define COLLECTIONTYPE
Definition: liblwgeom.h:122
#define COMPOUNDTYPE
Definition: liblwgeom.h:124
#define LW_FAILURE
Definition: liblwgeom.h:110
#define CURVEPOLYTYPE
Definition: liblwgeom.h:125
#define MULTILINETYPE
Definition: liblwgeom.h:120
#define LINETYPE
Definition: liblwgeom.h:117
#define MULTIPOINTTYPE
Definition: liblwgeom.h:119
#define POINTTYPE
LWTYPE numbers, used internally by PostGIS.
Definition: liblwgeom.h:116
#define TINTYPE
Definition: liblwgeom.h:130
#define MULTIPOLYGONTYPE
Definition: liblwgeom.h:121
#define POLYGONTYPE
Definition: liblwgeom.h:118
#define POLYHEDRALSURFACETYPE
Definition: liblwgeom.h:128
#define CIRCSTRINGTYPE
Definition: liblwgeom.h:123
const char * lwtype_name(uint8_t type)
Return the type name string associated with a type number (e.g.
Definition: lwutil.c:216
#define TRIANGLETYPE
Definition: liblwgeom.h:129
int lwpoly_startpoint(const LWPOLY *lwpoly, POINT4D *pt)
Definition: lwpoly.c:524
int lwcollection_startpoint(const LWCOLLECTION *col, POINT4D *pt)
Definition: lwcollection.c:550
int ptarray_startpoint(const POINTARRAY *pa, POINT4D *pt)
Definition: ptarray.c:2001
void lwerror(const char *fmt,...)
Write a notice out to the error handler.
Definition: lwutil.c:190
uint8_t type
Definition: liblwgeom.h:476

References CIRCSTRINGTYPE, COLLECTIONTYPE, COMPOUNDTYPE, CURVEPOLYTYPE, LINETYPE, LW_FAILURE, lwcollection_startpoint(), lwerror(), lwpoly_startpoint(), lwtype_name(), MULTILINETYPE, MULTIPOINTTYPE, MULTIPOLYGONTYPE, POINTTYPE, POLYGONTYPE, POLYHEDRALSURFACETYPE, ptarray_startpoint(), TINTYPE, TRIANGLETYPE, LWGEOM::type, and LWPOINT::type.

Referenced by geography_distance_cache_tolerance(), geography_tree_distance(), lwcollection_startpoint(), and lwgeom_solid_contains_lwgeom().

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