PostGIS  2.3.8dev-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 2487 of file lwgeodetic.c.

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().

2488 {
2489  int i;
2490  int first = LW_TRUE;
2491  const POINT2D *p;
2492  POINT3D A1, A2;
2493  GBOX edge_gbox;
2494 
2495  assert(gbox);
2496  assert(pa);
2497 
2498  gbox_init(&edge_gbox);
2499  edge_gbox.flags = gbox->flags;
2500 
2501  if ( pa->npoints == 0 ) return LW_FAILURE;
2502 
2503  if ( pa->npoints == 1 )
2504  {
2505  p = getPoint2d_cp(pa, 0);
2506  ll2cart(p, &A1);
2507  gbox->xmin = gbox->xmax = A1.x;
2508  gbox->ymin = gbox->ymax = A1.y;
2509  gbox->zmin = gbox->zmax = A1.z;
2510  return LW_SUCCESS;
2511  }
2512 
2513  p = getPoint2d_cp(pa, 0);
2514  ll2cart(p, &A1);
2515 
2516  for ( i = 1; i < pa->npoints; i++ )
2517  {
2518 
2519  p = getPoint2d_cp(pa, i);
2520  ll2cart(p, &A2);
2521 
2522  edge_calculate_gbox(&A1, &A2, &edge_gbox);
2523 
2524  /* Initialize the box */
2525  if ( first )
2526  {
2527  gbox_duplicate(&edge_gbox, gbox);
2528  first = LW_FALSE;
2529  }
2530  /* Expand the box where necessary */
2531  else
2532  {
2533  gbox_merge(&edge_gbox, gbox);
2534  }
2535 
2536  A1 = A2;
2537  }
2538 
2539  return LW_SUCCESS;
2540 }
void gbox_duplicate(const GBOX *original, GBOX *duplicate)
Copy the values of original GBOX into duplicate.
Definition: g_box.c:445
double y
Definition: liblwgeom.h:339
int npoints
Definition: liblwgeom.h:370
double xmax
Definition: liblwgeom.h:292
#define LW_SUCCESS
Definition: liblwgeom.h:79
double x
Definition: liblwgeom.h:339
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:269
#define LW_FAILURE
Definition: liblwgeom.h:78
double z
Definition: liblwgeom.h:339
double zmax
Definition: liblwgeom.h:296
double ymin
Definition: liblwgeom.h:293
void gbox_init(GBOX *gbox)
Zero out all the entries in the GBOX.
Definition: g_box.c:51
double xmin
Definition: liblwgeom.h:291
#define LW_FALSE
Definition: liblwgeom.h:76
const POINT2D * getPoint2d_cp(const POINTARRAY *pa, int n)
Returns a POINT2D pointer into the POINTARRAY serialized_ptlist, suitable for reading from...
Definition: lwgeom_api.c:485
#define LW_TRUE
Return types for functions with status returns.
Definition: liblwgeom.h:75
void ll2cart(const POINT2D *g, POINT3D *p)
Convert lon/lat coordinates to cartesion coordinates on unit sphere.
Definition: lwgeodetic.c:388
double ymax
Definition: liblwgeom.h:294
uint8_t flags
Definition: liblwgeom.h:290
double zmin
Definition: liblwgeom.h:295
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:1373
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