PostGIS  2.2.7dev-r@@SVN_REVISION@@
int ptarray_insert_point ( POINTARRAY pa,
const POINT4D p,
int  where 
)

Insert a point into an existing POINTARRAY.

Zero is the index of the start of the array.

Definition at line 96 of file ptarray.c.

References POINTARRAY::flags, FLAGS_GET_READONLY, getPoint_internal(), LW_FAILURE, LW_SUCCESS, lwalloc(), LWDEBUGF, lwerror(), lwrealloc(), POINTARRAY::maxpoints, POINTARRAY::npoints, ptarray_point_size(), ptarray_set_point4d(), and POINTARRAY::serialized_pointlist.

Referenced by lwline_add_lwpoint(), lwt_AddPoint(), ptarray_append_point(), and test_ptarray_insert_point().

97 {
98  size_t point_size = ptarray_point_size(pa);
99  LWDEBUGF(5,"pa = %p; p = %p; where = %d", pa, p, where);
100  LWDEBUGF(5,"pa->npoints = %d; pa->maxpoints = %d", pa->npoints, pa->maxpoints);
101 
102  if ( FLAGS_GET_READONLY(pa->flags) )
103  {
104  lwerror("ptarray_insert_point: called on read-only point array");
105  return LW_FAILURE;
106  }
107 
108  /* Error on invalid offset value */
109  if ( where > pa->npoints || where < 0)
110  {
111  lwerror("ptarray_insert_point: offset out of range (%d)", where);
112  return LW_FAILURE;
113  }
114 
115  /* If we have no storage, let's allocate some */
116  if( pa->maxpoints == 0 || ! pa->serialized_pointlist )
117  {
118  pa->maxpoints = 32;
119  pa->npoints = 0;
121  }
122 
123  /* Error out if we have a bad situation */
124  if ( pa->npoints > pa->maxpoints )
125  {
126  lwerror("npoints (%d) is greated than maxpoints (%d)", pa->npoints, pa->maxpoints);
127  return LW_FAILURE;
128  }
129 
130  /* Check if we have enough storage, add more if necessary */
131  if( pa->npoints == pa->maxpoints )
132  {
133  pa->maxpoints *= 2;
135  }
136 
137  /* Make space to insert the new point */
138  if( where < pa->npoints )
139  {
140  size_t copy_size = point_size * (pa->npoints - where);
141  memmove(getPoint_internal(pa, where+1), getPoint_internal(pa, where), copy_size);
142  LWDEBUGF(5,"copying %d bytes to start vertex %d from start vertex %d", copy_size, where+1, where);
143  }
144 
145  /* We have one more point */
146  ++pa->npoints;
147 
148  /* Copy the new point into the gap */
149  ptarray_set_point4d(pa, where, p);
150  LWDEBUGF(5,"copying new point to start vertex %d", point_size, where);
151 
152  return LW_SUCCESS;
153 }
void ptarray_set_point4d(POINTARRAY *pa, int n, const POINT4D *p4d)
Definition: lwgeom_api.c:536
uint8_t * serialized_pointlist
Definition: liblwgeom.h:350
int ptarray_point_size(const POINTARRAY *pa)
Definition: ptarray.c:54
#define FLAGS_GET_READONLY(flags)
Definition: liblwgeom.h:128
int npoints
Definition: liblwgeom.h:355
#define LW_SUCCESS
Definition: liblwgeom.h:65
#define LW_FAILURE
Definition: liblwgeom.h:64
uint8_t flags
Definition: liblwgeom.h:353
void * lwrealloc(void *mem, size_t size)
Definition: lwutil.c:207
int maxpoints
Definition: liblwgeom.h:356
void * lwalloc(size_t size)
Definition: lwutil.c:199
#define LWDEBUGF(level, msg,...)
Definition: lwgeom_log.h:55
uint8_t * getPoint_internal(const POINTARRAY *pa, int n)
Definition: ptarray.c:1706
void lwerror(const char *fmt,...)
Write a notice out to the error handler.
Definition: lwutil.c:74

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