PostGIS  2.5.0beta2dev-r@@SVN_REVISION@@

◆ lwgeom_split_wrapx()

static LWGEOM* lwgeom_split_wrapx ( const LWGEOM geom_in,
double  cutx,
double  amount 
)
static

Definition at line 37 of file lwgeom_wrapx.c.

References lwcollection_as_lwgeom(), lwcollection_free(), lwcollection_wrapx(), LWDEBUG, LWDEBUGF, LWDEBUGG, lwerror(), lwgeom_affine(), lwgeom_as_lwcollection(), lwgeom_clone_deep(), lwgeom_free(), lwgeom_geos_errmsg, lwgeom_get_bbox(), lwgeom_split(), lwgeom_unaryunion(), lwline_as_lwgeom(), lwline_construct(), lwnotice(), ptarray_construct(), ptarray_set_point4d(), LWGEOM::srid, POINT4D::x, GBOX::xmax, GBOX::xmin, POINT4D::y, GBOX::ymax, and GBOX::ymin.

Referenced by lwgeom_wrapx().

38 {
39  LWGEOM *blade, *split;
40  POINTARRAY *bladepa;
41  POINT4D pt;
42  const GBOX *box_in;
43  AFFINE affine = {
44  1, 0, 0,
45  0, 1, 0,
46  0, 0, 1,
47  amount, 0, 0,
48  };
49 
50  /* Extract box */
51  /* TODO: check if the bbox should be force-recomputed */
52  box_in = lwgeom_get_bbox(geom_in);
53  if ( ! box_in ) {
54  /* must be empty */
55  return lwgeom_clone_deep(geom_in);
56  }
57 
58  LWDEBUGF(2, "BOX X range is %g..%g, cutx:%g, amount:%g", box_in->xmin, box_in->xmax, cutx, amount);
59 
60  /* Check if geometry is fully on the side needing shift */
61  if ( ( amount < 0 && box_in->xmin >= cutx ) || ( amount > 0 && box_in->xmax <= cutx ) )
62  {
63  split = lwgeom_clone_deep(geom_in);
64  lwgeom_affine(split, &affine);
65  LWDEBUGG(2, split, "returning the translated geometry");
66  return split;
67  }
68 
69  /* Check if geometry is fully on the side needing no shift */
70  if ( ( amount < 0 && box_in->xmax <= cutx ) || ( amount > 0 && box_in->xmin >= cutx ) )
71  {
72  split = lwgeom_clone_deep(geom_in);
73  LWDEBUGG(2, split, "returning the cloned geometry");
74  return split;
75  }
76 
77  /* We need splitting here */
78 
79  /* construct blade */
80  bladepa = ptarray_construct(0, 0, 2);
81  pt.x = cutx;
82  pt.y = box_in->ymin - 1;
83  ptarray_set_point4d(bladepa, 0, &pt);
84  pt.y = box_in->ymax + 1;
85  ptarray_set_point4d(bladepa, 1, &pt);
86  blade = lwline_as_lwgeom(lwline_construct(geom_in->srid, NULL, bladepa));
87 
88  LWDEBUG(2, "splitting the geometry");
89 
90  /* split by blade */
91  split = lwgeom_split(geom_in, blade);
92  lwgeom_free(blade);
93  if ( ! split ) {
94  lwerror("%s:%d - lwgeom_split_wrapx: %s", __FILE__, __LINE__, lwgeom_geos_errmsg);
95  return NULL;
96  }
97  LWDEBUGG(2, split, "split geometry");
98 
99 
100  /* iterate over components, translate if needed */
101  const LWCOLLECTION *col = lwgeom_as_lwcollection(split);
102  if ( ! col ) {
103  /* not split, this is unexpected */
104  lwnotice("WARNING: unexpected lack of split in lwgeom_split_wrapx");
105  return lwgeom_clone_deep(geom_in);
106  }
107  LWCOLLECTION *col_out = lwcollection_wrapx(col, cutx, amount);
108  lwgeom_free(split);
109 
110  /* unary-union the result (homogenize too ?) */
112  LWDEBUGF(2, "col_out:%p, unaryunion_out:%p", col_out, out);
113  LWDEBUGG(2, out, "unary-unioned");
114 
115  lwcollection_free(col_out);
116 
117  return out;
118 }
double x
Definition: liblwgeom.h:354
POINTARRAY * ptarray_construct(char hasz, char hasm, uint32_t npoints)
Construct an empty pointarray, allocating storage and setting the npoints, but not filling in any inf...
Definition: ptarray.c:62
void lwnotice(const char *fmt,...)
Write a notice out to the notice handler.
Definition: lwutil.c:177
double xmax
Definition: liblwgeom.h:295
void lwgeom_free(LWGEOM *geom)
Definition: lwgeom.c:1144
char lwgeom_geos_errmsg[LWGEOM_GEOS_ERRMSG_MAXSIZE]
void ptarray_set_point4d(POINTARRAY *pa, uint32_t n, const POINT4D *p4d)
Definition: lwgeom_api.c:425
#define LWDEBUG(level, msg)
Definition: lwgeom_log.h:83
LWGEOM * lwgeom_clone_deep(const LWGEOM *lwgeom)
Deep clone an LWGEOM, everything is copied.
Definition: lwgeom.c:520
int32_t srid
Definition: liblwgeom.h:401
static LWCOLLECTION * lwcollection_wrapx(const LWCOLLECTION *lwcoll_in, double cutx, double amount)
Definition: lwgeom_wrapx.c:121
double ymin
Definition: liblwgeom.h:296
LWGEOM * lwline_as_lwgeom(const LWLINE *obj)
Definition: lwgeom.c:330
double xmin
Definition: liblwgeom.h:294
LWLINE * lwline_construct(int srid, GBOX *bbox, POINTARRAY *points)
Definition: lwline.c:42
const GBOX * lwgeom_get_bbox(const LWGEOM *lwgeom)
Get a non-empty geometry bounding box, computing and caching it if not already there.
Definition: lwgeom.c:734
double ymax
Definition: liblwgeom.h:297
#define LWDEBUGG(level, geom, msg)
Definition: lwgeom_log.h:93
LWGEOM * lwgeom_unaryunion(const LWGEOM *geom1)
LWCOLLECTION * lwgeom_as_lwcollection(const LWGEOM *lwgeom)
Definition: lwgeom.c:224
void lwcollection_free(LWCOLLECTION *col)
Definition: lwcollection.c:356
double y
Definition: liblwgeom.h:354
#define LWDEBUGF(level, msg,...)
Definition: lwgeom_log.h:88
void lwerror(const char *fmt,...)
Write a notice out to the error handler.
Definition: lwutil.c:190
void lwgeom_affine(LWGEOM *geom, const AFFINE *affine)
Definition: lwgeom.c:1969
LWGEOM * lwgeom_split(const LWGEOM *lwgeom_in, const LWGEOM *blade_in)
LWGEOM * lwcollection_as_lwgeom(const LWCOLLECTION *obj)
Definition: lwgeom.c:300
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