PostGIS  2.1.10dev-r@@SVN_REVISION@@
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 481 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().

482 {
483  POINTARRAY *ret;
484  POINT4D pbuf;
485  size_t ptsize = ptarray_point_size(pa);
486 
487  LWDEBUGF(3, "pa %x p %x size %d where %d",
488  pa, p, pdims, where);
489 
490  if ( pdims < 2 || pdims > 4 )
491  {
492  lwerror("ptarray_addPoint: point dimension out of range (%d)",
493  pdims);
494  return NULL;
495  }
496 
497  if ( where > pa->npoints )
498  {
499  lwerror("ptarray_addPoint: offset out of range (%d)",
500  where);
501  return NULL;
502  }
503 
504  LWDEBUG(3, "called with a %dD point");
505 
506  pbuf.x = pbuf.y = pbuf.z = pbuf.m = 0.0;
507  memcpy((uint8_t *)&pbuf, p, pdims*sizeof(double));
508 
509  LWDEBUG(3, "initialized point buffer");
510 
512  FLAGS_GET_M(pa->flags), pa->npoints+1);
513 
514  if ( where == -1 ) where = pa->npoints;
515 
516  if ( where )
517  {
518  memcpy(getPoint_internal(ret, 0), getPoint_internal(pa, 0), ptsize*where);
519  }
520 
521  memcpy(getPoint_internal(ret, where), (uint8_t *)&pbuf, ptsize);
522 
523  if ( where+1 != ret->npoints )
524  {
525  memcpy(getPoint_internal(ret, where+1),
526  getPoint_internal(pa, where),
527  ptsize*(pa->npoints-where));
528  }
529 
530  return ret;
531 }
double x
Definition: liblwgeom.h:308
double m
Definition: liblwgeom.h:308
int ptarray_point_size(const POINTARRAY *pa)
Definition: ptarray.c:41
int npoints
Definition: liblwgeom.h:327
#define LWDEBUG(level, msg)
Definition: lwgeom_log.h:50
void lwerror(const char *fmt,...)
Write a notice out to the error handler.
Definition: lwutil.c:67
uint8_t flags
Definition: liblwgeom.h:325
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:49
#define FLAGS_GET_Z(flags)
Macros for manipulating the 'flags' byte.
Definition: liblwgeom.h:106
double z
Definition: liblwgeom.h:308
#define FLAGS_GET_M(flags)
Definition: liblwgeom.h:107
double y
Definition: liblwgeom.h:308
#define LWDEBUGF(level, msg,...)
Definition: lwgeom_log.h:55
uint8_t * getPoint_internal(const POINTARRAY *pa, int n)
Definition: ptarray.c:1645

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