PostGIS  2.2.7dev-r@@SVN_REVISION@@
LWCIRCSTRING * lwcircstring_from_lwmpoint ( int  srid,
LWMPOINT mpoint 
)

Definition at line 186 of file lwcircstring.c.

References LWMPOINT::flags, FLAGS_GET_ZM, LWMPOINT::geoms, getPoint_internal(), lwalloc(), lwcircstring_construct(), LWDEBUGF, LWMPOINT::ngeoms, LWPOINT::point, and ptarray_construct_reference_data().

187 {
188  uint32_t i;
189  POINTARRAY *pa;
190  char zmflag = FLAGS_GET_ZM(mpoint->flags);
191  size_t ptsize, size;
192  uint8_t *newpoints, *ptr;
193 
194  if (zmflag == 0) ptsize = 2 * sizeof(double);
195  else if (zmflag == 3) ptsize = 4 * sizeof(double);
196  else ptsize = 3 * sizeof(double);
197 
198  /* Allocate space for output points */
199  size = ptsize * mpoint->ngeoms;
200  newpoints = lwalloc(size);
201  memset(newpoints, 0, size);
202 
203  ptr = newpoints;
204  for (i = 0; i < mpoint->ngeoms; i++)
205  {
206  memcpy(ptr,
207  getPoint_internal(mpoint->geoms[i]->point, 0),
208  ptsize);
209  ptr += ptsize;
210  }
211 
212  pa = ptarray_construct_reference_data(zmflag&2, zmflag&1, mpoint->ngeoms, newpoints);
213 
214  LWDEBUGF(3, "lwcurve_from_lwmpoint: constructed pointarray for %d points, %d zmflag", mpoint->ngeoms, zmflag);
215 
216  return lwcircstring_construct(srid, NULL, pa);
217 }
#define FLAGS_GET_ZM(flags)
Definition: liblwgeom.h:137
uint8_t flags
Definition: liblwgeom.h:449
POINTARRAY * point
Definition: liblwgeom.h:395
uint8_t * getPoint_internal(const POINTARRAY *pa, int n)
Definition: ptarray.c:1706
POINTARRAY * ptarray_construct_reference_data(char hasz, char hasm, uint32_t npoints, uint8_t *ptlist)
Construct a new POINTARRAY, referencing to the data from ptlist.
Definition: ptarray.c:295
LWPOINT ** geoms
Definition: liblwgeom.h:454
void * lwalloc(size_t size)
Definition: lwutil.c:199
int ngeoms
Definition: liblwgeom.h:452
#define LWDEBUGF(level, msg,...)
Definition: lwgeom_log.h:55
LWCIRCSTRING * lwcircstring_construct(int srid, GBOX *bbox, POINTARRAY *points)
Definition: lwcircstring.c:38

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