PostGIS  2.5.0rc1dev-r@@SVN_REVISION@@

◆ getPoint4d_p()

int getPoint4d_p ( const POINTARRAY pa,
uint32_t  n,
POINT4D point 
)

Definition at line 113 of file lwgeom_api.c.

References POINTARRAY::flags, FLAGS_GET_ZM, getPoint_internal(), LWDEBUG, LWDEBUGF, lwerror(), lwnotice(), POINT4D::m, NO_M_VALUE, NO_Z_VALUE, POINTARRAY::npoints, and POINT4D::z.

Referenced by _lwt_AddLineEdge(), _lwt_AddPoint(), analyze_pa(), circstring_from_pa(), encode_coords(), encode_mpoint(), getPoint4d(), linestring_from_pa(), lwarc_linearize(), lwcircstring_calculate_gbox_cartesian(), lwcircstring_linearize(), lwcompound_add_lwgeom(), lwcompound_linearize(), LWGEOM_dumppoints(), LWGEOM_setpoint_linestring(), LWGEOM_snaptogrid_pointoff(), lwgeom_wrapx(), lwline_add_lwpoint(), lwline_clip_to_ordinate_range(), lwline_from_lwmpoint(), lwline_interpolate_points(), lwline_split_by_point_to(), lwmpoint_construct(), lwmpoint_extract_points_4d(), lwpoint_get_m(), lwpoint_get_x(), lwpoint_get_y(), lwpoint_get_z(), lwpoint_getPoint4d_p(), lwpointiterator_peek(), lwpoly_from_twkb_state(), lwpsurface_is_closed(), lwtin_is_closed(), parse_kml_polygon(), printPA(), pta_unstroke(), ptarray_affine(), ptarray_append_point(), ptarray_calculate_gbox_cartesian(), ptarray_collect_mvals(), ptarray_flip_coordinates(), ptarray_force_dims(), ptarray_force_geodetic(), ptarray_length_spheroid(), ptarray_locate_along(), ptarray_locate_along_linear(), ptarray_locate_between_m(), ptarray_locate_point(), ptarray_nudge_geodetic(), ptarray_scale(), ptarray_segmentize2d(), ptarray_segmentize_sphere(), ptarray_startpoint(), ptarray_substring(), ptarray_swap_ordinates(), ptarray_to_kml2_sb(), ptarray_to_x3d3_sb(), ptarray_transform(), RTreeCreateLeafNode(), test_raster_convex_hull(), and test_raster_envelope_geom().

114 {
115  uint8_t *ptr;
116  int zmflag;
117 
118  if ( ! pa )
119  {
120  lwerror("%s [%d] NULL POINTARRAY input", __FILE__, __LINE__);
121  return 0;
122  }
123 
124  if ( n>=pa->npoints )
125  {
126  lwnotice("%s [%d] called with n=%d and npoints=%d", __FILE__, __LINE__, n, pa->npoints);
127  return 0;
128  }
129 
130  LWDEBUG(4, "getPoint4d_p called.");
131 
132  /* Get a pointer to nth point offset and zmflag */
133  ptr=getPoint_internal(pa, n);
134  zmflag=FLAGS_GET_ZM(pa->flags);
135 
136  LWDEBUGF(4, "ptr %p, zmflag %d", ptr, zmflag);
137 
138  switch (zmflag)
139  {
140  case 0: /* 2d */
141  memcpy(op, ptr, sizeof(POINT2D));
142  op->m=NO_M_VALUE;
143  op->z=NO_Z_VALUE;
144  break;
145 
146  case 3: /* ZM */
147  memcpy(op, ptr, sizeof(POINT4D));
148  break;
149 
150  case 2: /* Z */
151  memcpy(op, ptr, sizeof(POINT3DZ));
152  op->m=NO_M_VALUE;
153  break;
154 
155  case 1: /* M */
156  memcpy(op, ptr, sizeof(POINT3DM));
157  op->m=op->z; /* we use Z as temporary storage */
158  op->z=NO_Z_VALUE;
159  break;
160 
161  default:
162  lwerror("Unknown ZM flag ??");
163  return 0;
164  }
165  return 1;
166 
167 }
void lwnotice(const char *fmt,...)
Write a notice out to the notice handler.
Definition: lwutil.c:177
#define FLAGS_GET_ZM(flags)
Definition: liblwgeom.h:152
#define LWDEBUG(level, msg)
Definition: lwgeom_log.h:83
uint8_t flags
Definition: liblwgeom.h:371
#define NO_Z_VALUE
uint8_t * getPoint_internal(const POINTARRAY *pa, uint32_t n)
Definition: ptarray.c:1743
#define NO_M_VALUE
#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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