PostGIS  2.5.7dev-r@@SVN_REVISION@@

◆ ptarray_calculate_gbox_geodetic()

int ptarray_calculate_gbox_geodetic ( const POINTARRAY pa,
GBOX gbox 
)

Calculate geodetic (x/y/z) box and add values to gbox.

Return LW_SUCCESS on success.

Definition at line 2889 of file lwgeodetic.c.

2890 {
2891  uint32_t i;
2892  int first = LW_TRUE;
2893  const POINT2D *p;
2894  POINT3D A1, A2;
2895  GBOX edge_gbox;
2896 
2897  assert(gbox);
2898  assert(pa);
2899 
2900  gbox_init(&edge_gbox);
2901  edge_gbox.flags = gbox->flags;
2902 
2903  if ( pa->npoints == 0 ) return LW_FAILURE;
2904 
2905  if ( pa->npoints == 1 )
2906  {
2907  p = getPoint2d_cp(pa, 0);
2908  ll2cart(p, &A1);
2909  gbox->xmin = gbox->xmax = A1.x;
2910  gbox->ymin = gbox->ymax = A1.y;
2911  gbox->zmin = gbox->zmax = A1.z;
2912  return LW_SUCCESS;
2913  }
2914 
2915  p = getPoint2d_cp(pa, 0);
2916  ll2cart(p, &A1);
2917 
2918  for ( i = 1; i < pa->npoints; i++ )
2919  {
2920 
2921  p = getPoint2d_cp(pa, i);
2922  ll2cart(p, &A2);
2923 
2924  edge_calculate_gbox(&A1, &A2, &edge_gbox);
2925 
2926  /* Initialize the box */
2927  if ( first )
2928  {
2929  gbox_duplicate(&edge_gbox, gbox);
2930  first = LW_FALSE;
2931  }
2932  /* Expand the box where necessary */
2933  else
2934  {
2935  gbox_merge(&edge_gbox, gbox);
2936  }
2937 
2938  A1 = A2;
2939  }
2940 
2941  return LW_SUCCESS;
2942 }
int gbox_merge(const GBOX *new_box, GBOX *merge_box)
Update the merged GBOX to be large enough to include itself and the new box.
Definition: g_box.c:264
void gbox_duplicate(const GBOX *original, GBOX *duplicate)
Copy the values of original GBOX into duplicate.
Definition: g_box.c:440
void gbox_init(GBOX *gbox)
Zero out all the entries in the GBOX.
Definition: g_box.c:47
#define LW_FALSE
Definition: liblwgeom.h:77
#define LW_FAILURE
Definition: liblwgeom.h:79
#define LW_SUCCESS
Definition: liblwgeom.h:80
#define LW_TRUE
Return types for functions with status returns.
Definition: liblwgeom.h:76
const POINT2D * getPoint2d_cp(const POINTARRAY *pa, uint32_t n)
Returns a POINT2D pointer into the POINTARRAY serialized_ptlist, suitable for reading from.
Definition: lwgeom_api.c:374
void ll2cart(const POINT2D *g, POINT3D *p)
Convert lon/lat coordinates to cartesian coordinates on unit sphere.
Definition: lwgeodetic.c:423
int edge_calculate_gbox(const POINT3D *A1, const POINT3D *A2, GBOX *gbox)
The magic function, given an edge in spherical coordinates, calculate a 3D bounding box that fully co...
Definition: lwgeodetic.c:1408
double ymax
Definition: liblwgeom.h:298
double zmax
Definition: liblwgeom.h:300
double xmax
Definition: liblwgeom.h:296
double zmin
Definition: liblwgeom.h:299
double ymin
Definition: liblwgeom.h:297
double xmin
Definition: liblwgeom.h:295
uint8_t flags
Definition: liblwgeom.h:294
double z
Definition: liblwgeom.h:343
double x
Definition: liblwgeom.h:343
double y
Definition: liblwgeom.h:343
uint32_t npoints
Definition: liblwgeom.h:374
unsigned int uint32_t
Definition: uthash.h:78

References edge_calculate_gbox(), GBOX::flags, gbox_duplicate(), gbox_init(), gbox_merge(), getPoint2d_cp(), ll2cart(), LW_FAILURE, LW_FALSE, LW_SUCCESS, LW_TRUE, POINTARRAY::npoints, POINT3D::x, GBOX::xmax, GBOX::xmin, POINT3D::y, GBOX::ymax, GBOX::ymin, POINT3D::z, GBOX::zmax, and GBOX::zmin.

Referenced by lwline_calculate_gbox_geodetic(), lwpoint_calculate_gbox_geodetic(), lwpolygon_calculate_gbox_geodetic(), and lwtriangle_calculate_gbox_geodetic().

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