PostGIS  2.5.0dev-r@@SVN_REVISION@@

◆ lwgeom_get_geos_coordseq_2d()

static GEOSCoordSequence* lwgeom_get_geos_coordseq_2d ( const LWGEOM g,
uint32_t  num_points 
)
static

Definition at line 1807 of file liblwgeom/lwgeom_geos.c.

References lwerror(), lwpointiterator_create(), lwpointiterator_destroy(), lwpointiterator_next(), POINT4D::x, and POINT4D::y.

Referenced by lwgeom_voronoi_diagram().

1808 {
1809  uint32_t i = 0;
1810  uint8_t num_dims = 2;
1811  LWPOINTITERATOR* it;
1812  GEOSCoordSequence* coords;
1813  POINT4D tmp;
1814 
1815  coords = GEOSCoordSeq_create(num_points, num_dims);
1816  if (!coords) return NULL;
1817 
1818  it = lwpointiterator_create(g);
1819  while (lwpointiterator_next(it, &tmp))
1820  {
1821  if (i >= num_points)
1822  {
1823  lwerror("Incorrect num_points provided to lwgeom_get_geos_coordseq_2d");
1824  GEOSCoordSeq_destroy(coords);
1826  return NULL;
1827  }
1828 
1829  if (!GEOSCoordSeq_setX(coords, i, tmp.x) || !GEOSCoordSeq_setY(coords, i, tmp.y))
1830  {
1831  GEOSCoordSeq_destroy(coords);
1833  return NULL;
1834  }
1835  i++;
1836  }
1838 
1839  return coords;
1840 }
double x
Definition: liblwgeom.h:354
int lwpointiterator_next(LWPOINTITERATOR *s, POINT4D *p)
Attempts to assign the next point in the iterator to p, and advances the iterator to the next point...
Definition: lwiterator.c:212
LWPOINTITERATOR * lwpointiterator_create(const LWGEOM *g)
Create a new LWPOINTITERATOR over supplied LWGEOM*.
Definition: lwiterator.c:244
unsigned int uint32_t
Definition: uthash.h:78
void lwpointiterator_destroy(LWPOINTITERATOR *s)
Free all memory associated with the iterator.
Definition: lwiterator.c:269
double y
Definition: liblwgeom.h:354
unsigned char uint8_t
Definition: uthash.h:79
void lwerror(const char *fmt,...)
Write a notice out to the error handler.
Definition: lwutil.c:190
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