PostGIS  2.1.10dev-r@@SVN_REVISION@@
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 2473 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().

2474 {
2475  int i;
2476  int first = LW_TRUE;
2477  const POINT2D *p;
2478  POINT3D A1, A2;
2479  GBOX edge_gbox;
2480 
2481  assert(gbox);
2482  assert(pa);
2483 
2484  gbox_init(&edge_gbox);
2485  edge_gbox.flags = gbox->flags;
2486 
2487  if ( pa->npoints == 0 ) return LW_FAILURE;
2488 
2489  if ( pa->npoints == 1 )
2490  {
2491  p = getPoint2d_cp(pa, 0);
2492  ll2cart(p, &A1);
2493  gbox->xmin = gbox->xmax = A1.x;
2494  gbox->ymin = gbox->ymax = A1.y;
2495  gbox->zmin = gbox->zmax = A1.z;
2496  return LW_SUCCESS;
2497  }
2498 
2499  p = getPoint2d_cp(pa, 0);
2500  ll2cart(p, &A1);
2501 
2502  for ( i = 1; i < pa->npoints; i++ )
2503  {
2504 
2505  p = getPoint2d_cp(pa, i);
2506  ll2cart(p, &A2);
2507 
2508  edge_calculate_gbox(&A1, &A2, &edge_gbox);
2509 
2510  /* Initialize the box */
2511  if ( first )
2512  {
2513  gbox_duplicate(&edge_gbox, gbox);
2514  first = LW_FALSE;
2515  }
2516  /* Expand the box where necessary */
2517  else
2518  {
2519  gbox_merge(&edge_gbox, gbox);
2520  }
2521 
2522  A1 = A2;
2523  }
2524 
2525  return LW_SUCCESS;
2526 }
void gbox_duplicate(const GBOX *original, GBOX *duplicate)
Copy the values of original GBOX into duplicate.
Definition: g_box.c:369
double y
Definition: liblwgeom.h:296
int npoints
Definition: liblwgeom.h:327
double xmax
Definition: liblwgeom.h:249
#define LW_SUCCESS
Definition: liblwgeom.h:55
double x
Definition: liblwgeom.h:296
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:215
#define LW_FAILURE
Definition: liblwgeom.h:54
double z
Definition: liblwgeom.h:296
double zmax
Definition: liblwgeom.h:253
double ymin
Definition: liblwgeom.h:250
void gbox_init(GBOX *gbox)
Zero out all the entries in the GBOX.
Definition: g_box.c:34
double xmin
Definition: liblwgeom.h:248
#define LW_FALSE
Definition: liblwgeom.h:52
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:458
#define LW_TRUE
Return types for functions with status returns.
Definition: liblwgeom.h:51
void ll2cart(const POINT2D *g, POINT3D *p)
Convert lon/lat coordinates to cartesion coordinates on unit sphere.
Definition: lwgeodetic.c:374
double ymax
Definition: liblwgeom.h:251
uint8_t flags
Definition: liblwgeom.h:247
double zmin
Definition: liblwgeom.h:252
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:1355

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