/*
* Return a fully allocated LWGEOM containing elements
* intersected/interpolated with the given M range.
* Return NULL if none of the elements fall in the range.
*
* m0 is assumed to be less-or-equal to m1.
* input LWGEOM is assumed to contain an M value.
*
*/
static LWGEOM *
lwgeom_locate_between_m(LWGEOM *lwin, double m0, double m1)
{
POSTGIS_DEBUGF(2, "lwgeom_locate_between called for lwgeom %p", lwin);
switch (lwin->type)
{
case POINTTYPE:
return lwpoint_locate_between_m(
(LWPOINT *)lwin, m0, m1);
case LINETYPE:
return lwline_locate_between_m(
(LWLINE *)lwin, m0, m1);
case MULTIPOINTTYPE:
case MULTILINETYPE:
case COLLECTIONTYPE:
return lwcollection_locate_between_m(
(LWCOLLECTION *)lwin, m0, m1);
/* Polygon types are not supported */
case POLYGONTYPE:
case MULTIPOLYGONTYPE:
lwpgerror("Areal geometries are not supported by locate_between_measures");
return NULL;
}
lwpgerror("Unkonwn geometry type (%s:%d)", __FILE__, __LINE__);
return NULL;
}
Datum LWGEOM_locate_between_m(PG_FUNCTION_ARGS)
{
GSERIALIZED *gin = PG_GETARG_GSERIALIZED_P(0);
GSERIALIZED *gout;
double start_measure = PG_GETARG_FLOAT8(1);
double end_measure = PG_GETARG_FLOAT8(2);
LWGEOM *lwin, *lwout;
int hasz = gserialized_has_z(gin);
int hasm = gserialized_has_m(gin);
int type;
elog(WARNING,"ST_Locate_Between_Measures and ST_Locate_Along_Measure were deprecated in 2.2.0. Please use ST_LocateAlong and ST_LocateBetween");
if ( end_measure < start_measure )
{
lwpgerror("locate_between_m: 2nd arg must be bigger then 1st arg");
PG_RETURN_NULL();
}
/*
* Return error if input doesn't have a measure
*/
if ( ! hasm )
{
lwpgerror("Geometry argument does not have an 'M' ordinate");
PG_RETURN_NULL();
}
/*
* Raise an error if input is a polygon, a multipolygon
* or a collection
*/
type = gserialized_get_type(gin);
if ( type == POLYGONTYPE || type == MULTIPOLYGONTYPE || type == COLLECTIONTYPE )
{
lwpgerror("Areal or Collection types are not supported");
PG_RETURN_NULL();
}
lwin = lwgeom_from_gserialized(gin);
lwout = lwgeom_locate_between_m(lwin,
start_measure, end_measure);
lwgeom_free(lwin);
if ( lwout == NULL )
{
lwout = (LWGEOM *)lwcollection_construct_empty(COLLECTIONTYPE,
gserialized_get_srid(gin), hasz, hasm);
}
gout = geometry_serialize(lwout);
lwgeom_free(lwout);
PG_RETURN_POINTER(gout);
}
Datum ST_AddMeasure(PG_FUNCTION_ARGS)
{
GSERIALIZED *gin = PG_GETARG_GSERIALIZED_P(0);
GSERIALIZED *gout;
double start_measure = PG_GETARG_FLOAT8(1);
double end_measure = PG_GETARG_FLOAT8(2);
LWGEOM *lwin, *lwout;
int type = gserialized_get_type(gin);
/* Raise an error if input is not a linestring or multilinestring */
if ( type != LINETYPE && type != MULTILINETYPE )
{
lwpgerror("Only LINESTRING and MULTILINESTRING are supported");
PG_RETURN_NULL();
}
lwin = lwgeom_from_gserialized(gin);
if ( type == LINETYPE )
lwout = (LWGEOM*)lwline_measured_from_lwline((LWLINE*)lwin, start_measure, end_measure);
else
lwout = (LWGEOM*)lwmline_measured_from_lwmline((LWMLINE*)lwin, start_measure, end_measure);
lwgeom_free(lwin);
if ( lwout == NULL )
PG_RETURN_NULL();
gout = geometry_serialize(lwout);
lwgeom_free(lwout);
PG_RETURN_POINTER(gout);
}
Datum sfcgal_approximate_medial_axis(PG_FUNCTION_ARGS)
{
#if POSTGIS_SFCGAL_VERSION < 12
lwpgerror("The SFCGAL version this PostGIS binary "
"was compiled against (%d) doesn't support "
"'sfcgal_geometry_approximate_medial_axis' function (1.2.0+ required)",
POSTGIS_SFCGAL_VERSION);
PG_RETURN_NULL();
#else /* POSTGIS_SFCGAL_VERSION >= 12 */
GSERIALIZED *input, *output;
sfcgal_geometry_t *geom;
sfcgal_geometry_t *result;
srid_t srid;
sfcgal_postgis_init();
input = PG_GETARG_GSERIALIZED_P(0);
srid = gserialized_get_srid(input);
geom = POSTGIS2SFCGALGeometry(input);
PG_FREE_IF_COPY(input, 0);
result = sfcgal_geometry_approximate_medial_axis(geom);
sfcgal_geometry_delete(geom);
output = SFCGALGeometry2POSTGIS(result, 0, srid);
sfcgal_geometry_delete(result);
PG_RETURN_POINTER(output);
#endif /* POSTGIS_SFCGAL_VERSION >= 12 */
}
Datum LWGEOM_m_point(PG_FUNCTION_ARGS)
{
GSERIALIZED *geom;
LWPOINT *point = NULL;
LWGEOM *lwgeom;
POINT3DM p;
geom = PG_GETARG_GSERIALIZED_P(0);
if ( gserialized_get_type(geom) != POINTTYPE )
lwpgerror("Argument to ST_M() must be a point");
lwgeom = lwgeom_from_gserialized(geom);
point = lwgeom_as_lwpoint(lwgeom);
if ( lwgeom_is_empty(lwgeom) )
PG_RETURN_NULL();
/* no M in input */
if ( ! FLAGS_GET_M(point->flags) ) PG_RETURN_NULL();
getPoint3dm_p(point->point, 0, &p);
PG_FREE_IF_COPY(geom, 0);
PG_RETURN_FLOAT8(p.m);
}
/* Conversion from GSERIALIZED* to SFCGAL::Geometry */
sfcgal_geometry_t* POSTGIS2SFCGALGeometry(GSERIALIZED *pglwgeom)
{
sfcgal_geometry_t* g;
LWGEOM *lwgeom = lwgeom_from_gserialized(pglwgeom);
if (! lwgeom)
{
lwpgerror("POSTGIS2SFCGALGeometry: Unable to deserialize input");
}
g = LWGEOM2SFCGAL(lwgeom);
lwgeom_free(lwgeom);
return g;
}
/* Conversion from GSERIALIZED* to SFCGAL::PreparedGeometry */
sfcgal_prepared_geometry_t* POSTGIS2SFCGALPreparedGeometry(GSERIALIZED *pglwgeom)
{
sfcgal_geometry_t* g;
LWGEOM *lwgeom = lwgeom_from_gserialized(pglwgeom);
if (!lwgeom)
{
lwpgerror("POSTGIS2SFCGALPreparedGeometry: Unable to deserialize input");
}
g = LWGEOM2SFCGAL(lwgeom);
lwgeom_free(lwgeom);
return sfcgal_prepared_geometry_create_from_geometry(g, gserialized_get_srid(pglwgeom));
}
Datum LWGEOM_x_point(PG_FUNCTION_ARGS)
{
GSERIALIZED *geom;
LWGEOM *lwgeom;
LWPOINT *point = NULL;
POINT2D p;
geom = PG_GETARG_GSERIALIZED_P(0);
if ( gserialized_get_type(geom) != POINTTYPE )
lwpgerror("Argument to ST_X() must be a point");
lwgeom = lwgeom_from_gserialized(geom);
point = lwgeom_as_lwpoint(lwgeom);
if ( lwgeom_is_empty(lwgeom) )
PG_RETURN_NULL();
getPoint2d_p(point->point, 0, &p);
PG_FREE_IF_COPY(geom, 0);
PG_RETURN_FLOAT8(p.x);
}
static int
geography_distance_cache_tolerance(FunctionCallInfoData* fcinfo, const GSERIALIZED* g1, const GSERIALIZED* g2, const SPHEROID* s, double tolerance, double* distance)
{
CircTreeGeomCache* tree_cache = NULL;
int type1 = gserialized_get_type(g1);
int type2 = gserialized_get_type(g2);
Assert(distance);
/* Two points? Get outa here... */
if ( type1 == POINTTYPE && type2 == POINTTYPE )
return LW_FAILURE;
/* Fetch/build our cache, if appropriate, etc... */
tree_cache = GetCircTreeGeomCache(fcinfo, g1, g2);
/* OK, we have an index at the ready! Use it for the one tree argument and */
/* fill in the other tree argument */
if ( tree_cache && tree_cache->argnum && tree_cache->index )
{
CIRC_NODE* circtree_cached = tree_cache->index;
CIRC_NODE* circtree = NULL;
const GSERIALIZED* g_cached;
const GSERIALIZED* g;
LWGEOM* lwgeom = NULL;
int geomtype_cached;
int geomtype;
POINT4D p4d;
/* We need to dynamically build a tree for the uncached side of the function call */
if ( tree_cache->argnum == 1 )
{
g_cached = g1;
g = g2;
geomtype_cached = type1;
geomtype = type2;
}
else if ( tree_cache->argnum == 2 )
{
g_cached = g2;
g = g1;
geomtype_cached = type2;
geomtype = type1;
}
else
{
lwpgerror("geography_distance_cache this cannot happen!");
return LW_FAILURE;
}
lwgeom = lwgeom_from_gserialized(g);
if ( geomtype_cached == POLYGONTYPE || geomtype_cached == MULTIPOLYGONTYPE )
{
lwgeom_startpoint(lwgeom, &p4d);
if ( CircTreePIP(circtree_cached, g_cached, &p4d) )
{
*distance = 0.0;
lwgeom_free(lwgeom);
return LW_SUCCESS;
}
}
circtree = lwgeom_calculate_circ_tree(lwgeom);
if ( geomtype == POLYGONTYPE || geomtype == MULTIPOLYGONTYPE )
{
POINT2D p2d;
circ_tree_get_point(circtree_cached, &p2d);
p4d.x = p2d.x;
p4d.y = p2d.y;
if ( CircTreePIP(circtree, g, &p4d) )
{
*distance = 0.0;
circ_tree_free(circtree);
lwgeom_free(lwgeom);
return LW_SUCCESS;
}
}
*distance = circ_tree_distance_tree(circtree_cached, circtree, s, tolerance);
circ_tree_free(circtree);
lwgeom_free(lwgeom);
return LW_SUCCESS;
}
else
{
return LW_FAILURE;
}
}
/*
* Line is assumed to have an M value.
*
* Return NULL if no parts of the line are in the given range (inclusive)
*
* Return an LWCOLLECTION with LWLINES and LWPOINT being consecutive
* and isolated points on the line falling in the range.
*
* X,Y and Z (if present) ordinates are interpolated.
*
*/
static LWGEOM *
lwline_locate_between_m(LWLINE *lwline_in, double m0, double m1)
{
POINTARRAY *ipa=lwline_in->points;
int i;
LWGEOM **geoms;
int ngeoms;
int outtype;
int typeflag=0; /* see flags below */
const int pointflag=0x01;
const int lineflag=0x10;
POINTARRAYSET paset=ptarray_locate_between_m(ipa, m0, m1);
POSTGIS_DEBUGF(2, "lwline_locate_between called for lwline %p", lwline_in);
POSTGIS_DEBUGF(3, " ptarray_locate... returned %d pointarrays",
paset.nptarrays);
if ( paset.nptarrays == 0 )
{
return NULL;
}
ngeoms=paset.nptarrays;
/* TODO: rework this to reduce used memory */
geoms=lwalloc(sizeof(LWGEOM *)*ngeoms);
for (i=0; i<ngeoms; i++)
{
LWPOINT *lwpoint;
LWLINE *lwline;
POINTARRAY *pa=paset.ptarrays[i];
/* This is a point */
if ( pa->npoints == 1 )
{
lwpoint = lwpoint_construct(lwline_in->srid, NULL, pa);
geoms[i]=(LWGEOM *)lwpoint;
typeflag|=pointflag;
}
/* This is a line */
else if ( pa->npoints > 1 )
{
lwline = lwline_construct(lwline_in->srid, NULL, pa);
geoms[i]=(LWGEOM *)lwline;
typeflag|=lineflag;
}
/* This is a bug */
else
{
lwpgerror("ptarray_locate_between_m returned a POINARRAY set containing POINTARRAY with 0 points");
}
}
if ( ngeoms == 1 )
{
return geoms[0];
}
else
{
/* Choose best type */
if ( typeflag == 1 ) outtype=MULTIPOINTTYPE;
else if ( typeflag == 2 ) outtype=MULTILINETYPE;
else outtype = COLLECTIONTYPE;
return (LWGEOM *)lwcollection_construct(outtype,
lwline_in->srid, NULL, ngeoms, geoms);
}
}
static POINTARRAYSET
ptarray_locate_between_m(POINTARRAY *ipa, double m0, double m1)
{
POINTARRAYSET ret;
POINTARRAY *dpa=NULL;
int i;
ret.nptarrays=0;
/*
* We allocate space for as many pointarray as
* segments in the input POINTARRAY, as worst
* case is for each segment to cross the M range
* window.
* TODO: rework this to reduce used memory
*/
ret.ptarrays=lwalloc(sizeof(POINTARRAY *)*ipa->npoints-1);
POSTGIS_DEBUGF(2, "ptarray_locate...: called for pointarray %p, m0:%g, m1:%g",
ipa, m0, m1);
for (i=1; i<ipa->npoints; i++)
{
POINT4D p1, p2;
int clipval;
getPoint4d_p(ipa, i-1, &p1);
getPoint4d_p(ipa, i, &p2);
POSTGIS_DEBUGF(3, " segment %d-%d [ %g %g %g %g - %g %g %g %g ]",
i-1, i,
p1.x, p1.y, p1.z, p1.m,
p2.x, p2.y, p2.z, p2.m);
clipval = clip_seg_by_m_range(&p1, &p2, m0, m1);
/* segment completely outside, nothing to do */
if (! clipval ) continue;
POSTGIS_DEBUGF(3, " clipped to: [ %g %g %g %g - %g %g %g %g ] clipval: %d", p1.x, p1.y, p1.z, p1.m,
p2.x, p2.y, p2.z, p2.m, clipval);
/* If no points have been accumulated so far, then if clipval != 0 the first point must be the
start of the intersection */
if (dpa == NULL)
{
POSTGIS_DEBUGF(3, " 1 creating new POINTARRAY with first point %g,%g,%g,%g", p1.x, p1.y, p1.z, p1.m);
dpa = ptarray_construct_empty(FLAGS_GET_Z(ipa->flags), FLAGS_GET_M(ipa->flags), ipa->npoints-i);
ptarray_append_point(dpa, &p1, LW_TRUE);
}
/* Otherwise always add the next point, avoiding duplicates */
if (dpa)
ptarray_append_point(dpa, &p2, LW_FALSE);
/*
* second point has been clipped
*/
if ( clipval & 0x0100 || i == ipa->npoints-1 )
{
POSTGIS_DEBUGF(3, " closing pointarray %p with %d points", dpa, dpa->npoints);
ret.ptarrays[ret.nptarrays++] = dpa;
dpa = NULL;
}
}
/*
* if dpa!=NULL it means we didn't close it yet.
* this should never happen.
*/
if ( dpa != NULL ) lwpgerror("Something wrong with algorithm");
return ret;
}
static void geohash_lwpgerror(char *msg, int error_code)
{
POSTGIS_DEBUGF(3, "ST_Box2dFromGeoHash ERROR %i", error_code);
lwpgerror("%s", msg);
}
Datum LWGEOM_snaptogrid_pointoff(PG_FUNCTION_ARGS)
{
GSERIALIZED *in_geom, *in_point;
LWGEOM *in_lwgeom;
LWPOINT *in_lwpoint;
GSERIALIZED *out_geom = NULL;
LWGEOM *out_lwgeom;
gridspec grid;
/* BOX3D box3d; */
POINT4D offsetpoint;
in_geom = PG_GETARG_GSERIALIZED_P(0);
/* Return input geometry if input geometry is empty */
if ( gserialized_is_empty(in_geom) )
{
PG_RETURN_POINTER(in_geom);
}
in_point = PG_GETARG_GSERIALIZED_P(1);
in_lwpoint = lwgeom_as_lwpoint(lwgeom_from_gserialized(in_point));
if ( in_lwpoint == NULL )
{
lwpgerror("Offset geometry must be a point");
}
grid.xsize = PG_GETARG_FLOAT8(2);
grid.ysize = PG_GETARG_FLOAT8(3);
grid.zsize = PG_GETARG_FLOAT8(4);
grid.msize = PG_GETARG_FLOAT8(5);
/* Take offsets from point geometry */
getPoint4d_p(in_lwpoint->point, 0, &offsetpoint);
grid.ipx = offsetpoint.x;
grid.ipy = offsetpoint.y;
if (FLAGS_GET_Z(in_lwpoint->flags) ) grid.ipz = offsetpoint.z;
else grid.ipz=0;
if (FLAGS_GET_M(in_lwpoint->flags) ) grid.ipm = offsetpoint.m;
else grid.ipm=0;
#if POSTGIS_DEBUG_LEVEL >= 4
grid_print(&grid);
#endif
/* Return input geometry if input grid is meaningless */
if ( grid.xsize==0 && grid.ysize==0 && grid.zsize==0 && grid.msize==0 )
{
PG_RETURN_POINTER(in_geom);
}
in_lwgeom = lwgeom_from_gserialized(in_geom);
POSTGIS_DEBUGF(3, "SnapToGrid got a %s", lwtype_name(in_lwgeom->type));
out_lwgeom = lwgeom_grid(in_lwgeom, &grid);
if ( out_lwgeom == NULL ) PG_RETURN_NULL();
/* COMPUTE_BBOX TAINTING */
if ( in_lwgeom->bbox ) lwgeom_add_bbox(out_lwgeom);
POSTGIS_DEBUGF(3, "SnapToGrid made a %s", lwtype_name(out_lwgeom->type));
out_geom = geometry_serialize(out_lwgeom);
PG_RETURN_POINTER(out_geom);
}