PostGIS  2.5.0dev-r@@SVN_REVISION@@

◆ ptarray_addPoint()

POINTARRAY* ptarray_addPoint ( const POINTARRAY pa,
uint8_t p,
size_t  pdims,
uint32_t  where 
)

Add a point in a pointarray.

Parameters
pathe source POINTARRAY
pthe point to add
pdimsnumber of ordinates in p (2..4)
whereto insert the point. 0 prepends, pa->npoints appends
Returns
a newly constructed POINTARRAY using a newly allocated buffer for the actual points, or NULL on error.

Definition at line 503 of file ptarray.c.

References POINTARRAY::flags, FLAGS_GET_M, FLAGS_GET_Z, getPoint_internal(), LWDEBUG, LWDEBUGF, lwerror(), POINT4D::m, POINTARRAY::npoints, ptarray_construct(), ptarray_point_size(), POINT4D::x, POINT4D::y, and POINT4D::z.

Referenced by lwcircstring_addpoint(), LWGEOM2GEOS(), lwline_make_geos_friendly(), ptarray_close2d(), and ring_make_geos_friendly().

504 {
505  POINTARRAY *ret;
506  POINT4D pbuf;
507  size_t ptsize = ptarray_point_size(pa);
508 
509  LWDEBUGF(3, "pa %x p %x size %d where %d",
510  pa, p, pdims, where);
511 
512  if ( pdims < 2 || pdims > 4 )
513  {
514  lwerror("ptarray_addPoint: point dimension out of range (%d)",
515  pdims);
516  return NULL;
517  }
518 
519  if ( where > pa->npoints )
520  {
521  lwerror("ptarray_addPoint: offset out of range (%d)",
522  where);
523  return NULL;
524  }
525 
526  LWDEBUG(3, "called with a %dD point");
527 
528  pbuf.x = pbuf.y = pbuf.z = pbuf.m = 0.0;
529  memcpy((uint8_t *)&pbuf, p, pdims*sizeof(double));
530 
531  LWDEBUG(3, "initialized point buffer");
532 
534  FLAGS_GET_M(pa->flags), pa->npoints+1);
535 
536 
537  if ( where )
538  {
539  memcpy(getPoint_internal(ret, 0), getPoint_internal(pa, 0), ptsize*where);
540  }
541 
542  memcpy(getPoint_internal(ret, where), (uint8_t *)&pbuf, ptsize);
543 
544  if ( where+1 != ret->npoints )
545  {
546  memcpy(getPoint_internal(ret, where+1),
547  getPoint_internal(pa, where),
548  ptsize*(pa->npoints-where));
549  }
550 
551  return ret;
552 }
double x
Definition: liblwgeom.h:354
double m
Definition: liblwgeom.h:354
size_t ptarray_point_size(const POINTARRAY *pa)
Definition: ptarray.c:54
#define LWDEBUG(level, msg)
Definition: lwgeom_log.h:83
uint8_t * getPoint_internal(const POINTARRAY *pa, uint32_t n)
Definition: ptarray.c:1743
uint8_t flags
Definition: liblwgeom.h:371
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
#define FLAGS_GET_Z(flags)
Macros for manipulating the &#39;flags&#39; byte.
Definition: liblwgeom.h:139
double z
Definition: liblwgeom.h:354
#define FLAGS_GET_M(flags)
Definition: liblwgeom.h:140
double y
Definition: liblwgeom.h:354
#define LWDEBUGF(level, msg,...)
Definition: lwgeom_log.h:88
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
uint32_t npoints
Definition: liblwgeom.h:373
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