PostGIS  2.5.0beta2dev-r@@SVN_REVISION@@

◆ lwline_from_lwmpoint()

LWLINE* lwline_from_lwmpoint ( int  srid,
const LWMPOINT mpoint 
)

Definition at line 284 of file lwline.c.

References LWMPOINT::geoms, getPoint4d_p(), LWDEBUGF, lwgeom_has_m(), lwgeom_has_z(), lwgeom_is_empty(), lwline_construct(), lwline_construct_empty(), LWMPOINT::ngeoms, LWPOINT::point, ptarray_construct(), and ptarray_set_point4d().

Referenced by encode_mpoint(), LWGEOM_line_from_mpoint(), lwmmpoint_to_encoded_polyline(), and test_lwline_from_lwmpoint().

285 {
286  uint32_t i;
287  POINTARRAY *pa = NULL;
288  LWGEOM *lwgeom = (LWGEOM*)mpoint;
289  POINT4D pt;
290 
291  char hasz = lwgeom_has_z(lwgeom);
292  char hasm = lwgeom_has_m(lwgeom);
293  uint32_t npoints = mpoint->ngeoms;
294 
295  if ( lwgeom_is_empty(lwgeom) )
296  {
297  return lwline_construct_empty(srid, hasz, hasm);
298  }
299 
300  pa = ptarray_construct(hasz, hasm, npoints);
301 
302  for (i=0; i < npoints; i++)
303  {
304  getPoint4d_p(mpoint->geoms[i]->point, 0, &pt);
305  ptarray_set_point4d(pa, i, &pt);
306  }
307 
308  LWDEBUGF(3, "lwline_from_lwmpoint: constructed pointarray for %d points", mpoint->ngeoms);
309 
310  return lwline_construct(srid, NULL, pa);
311 }
POINTARRAY * ptarray_construct(char hasz, char hasm, uint32_t npoints)
Construct an empty pointarray, allocating storage and setting the npoints, but not filling in any inf...
Definition: ptarray.c:62
uint32_t ngeoms
Definition: liblwgeom.h:470
void ptarray_set_point4d(POINTARRAY *pa, uint32_t n, const POINT4D *p4d)
Definition: lwgeom_api.c:425
LWLINE * lwline_construct_empty(int srid, char hasz, char hasm)
Definition: lwline.c:64
POINTARRAY * point
Definition: liblwgeom.h:413
int lwgeom_has_z(const LWGEOM *geom)
Return LW_TRUE if geometry has Z ordinates.
Definition: lwgeom.c:930
unsigned int uint32_t
Definition: uthash.h:78
LWPOINT ** geoms
Definition: liblwgeom.h:472
int getPoint4d_p(const POINTARRAY *pa, uint32_t n, POINT4D *point)
Definition: lwgeom_api.c:113
int lwgeom_is_empty(const LWGEOM *geom)
Return true or false depending on whether a geometry is an "empty" geometry (no vertices members) ...
Definition: lwgeom.c:1393
#define LWDEBUGF(level, msg,...)
Definition: lwgeom_log.h:88
int lwgeom_has_m(const LWGEOM *geom)
Return LW_TRUE if geometry has M ordinates.
Definition: lwgeom.c:937
LWLINE * lwline_construct(int srid, GBOX *bbox, POINTARRAY *points)
Definition: lwline.c:42
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