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Add ST_CrossingDirection(line, line) bindings into SQL.

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git-svn-id: http://svn.osgeo.org/postgis/trunk@3425 b70326c6-7e19-0410-871a-916f4a2858ee
This commit is contained in:
Paul Ramsey 2008-12-16 23:43:02 +00:00
parent 768cd3ac72
commit 04d43077be
3 changed files with 65 additions and 1 deletions
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2
liblwgeom/lwalgorithm.c
View file

@ -210,7 +210,7 @@ int lineCrossingDirection(LWLINE *l1, LWLINE *l2) {
** TODO Handle co-linear cases.
*/
LWDEBUGF(5, "lineCrossingDirection: this_cross=%d, prev_cross=%d, vertex_touch=%d, vertex_touch_type=%d", this_cross, prev_cross, vertex_touch, vertex_touch_type);
LWDEBUGF(5, "lineCrossingDirection: this_cross=%d, vertex_touch=%d, vertex_touch_type=%d", this_cross, vertex_touch, vertex_touch_type);
}

56
lwgeom/lwgeom_functions_analytic.c
View file

@ -16,6 +16,7 @@
#include "lwgeom_pg.h"
#include "math.h"
#include "lwgeom_rtree.h"
#include "lwalgorithm.h"
/***********************************************************************
@ -35,6 +36,7 @@ LWPOLY *simplify2d_lwpoly(const LWPOLY *ipoly, double dist);
LWCOLLECTION *simplify2d_collection(const LWCOLLECTION *igeom, double dist);
LWGEOM *simplify2d_lwgeom(const LWGEOM *igeom, double dist);
Datum LWGEOM_simplify2d(PG_FUNCTION_ARGS);
Datum crossingDirection(PG_FUNCTION_ARGS);
double determineSide(POINT2D *seg1, POINT2D *seg2, POINT2D *point);
int isOnSegment(POINT2D *seg1, POINT2D *seg2, POINT2D *point);
@ -937,6 +939,60 @@ Datum LWGEOM_snaptogrid_pointoff(PG_FUNCTION_ARGS)
PG_RETURN_POINTER(out_geom);
}
/*
** crossingDirection(line1, line2)
**
** Determines crossing direction of line2 relative to line1.
** Only accepts LINESTRING ass parameters!
*/
PG_FUNCTION_INFO_V1(crossingDirection);
Datum crossingDirection(PG_FUNCTION_ARGS)
{
int type1, type2, rv;
BOX2DFLOAT4 box1, box2;
LWLINE *l1 = NULL;
LWLINE *l2 = NULL;
PG_LWGEOM *geom1 = (PG_LWGEOM *)PG_DETOAST_DATUM(PG_GETARG_DATUM(0));
PG_LWGEOM *geom2 = (PG_LWGEOM *)PG_DETOAST_DATUM(PG_GETARG_DATUM(1));
errorIfSRIDMismatch(pglwgeom_getSRID(geom1), pglwgeom_getSRID(geom2));
/*
** If the bounding boxes don't interact, then there can't be any
** crossing, return right away.
*/
if ( getbox2d_p(SERIALIZED_FORM(geom1), &box1) &&
getbox2d_p(SERIALIZED_FORM(geom2), &box2) )
{
if ( ( box2.xmax < box1.xmin ) || ( box2.xmin > box1.xmax ) ||
( box2.ymax < box1.ymin ) || ( box2.ymin > box1.ymax ) )
{
PG_RETURN_INT32(LINE_NO_CROSS);
}
}
type1 = lwgeom_getType((uchar)SERIALIZED_FORM(geom1)[0]);
type2 = lwgeom_getType((uchar)SERIALIZED_FORM(geom2)[0]);
if ( type1 != LINETYPE || type2 != LINETYPE )
{
elog(ERROR,"This function only accepts LINESTRING as arguments.");
PG_RETURN_NULL();
}
l1 = lwline_deserialize(SERIALIZED_FORM(geom1));
l2 = lwline_deserialize(SERIALIZED_FORM(geom2));
rv = lineCrossingDirection(l1, l2);
PG_FREE_IF_COPY(geom1, 0);
PG_FREE_IF_COPY(geom2, 0);
PG_RETURN_INT32(rv);
}
/***********************************************************************
* --strk@keybit.net
***********************************************************************/

8
lwgeom/lwpostgis.sql.in.c
View file

@ -3965,6 +3965,14 @@ CREATEFUNCTION ST_ConvexHull(geometry)
AS 'MODULE_PATHNAME','convexhull'
LANGUAGE 'C' _IMMUTABLE_STRICT; -- WITH (isstrict,iscachable);
-- Only accepts LINESTRING as parameters.
-- Availability: 1.4.0
CREATEFUNCTION ST_CrossingDirection(geometry, geometry)
RETURNS integer
AS 'MODULE_PATHNAME', 'crossingDirection'
LANGUAGE 'C' _IMMUTABLE_STRICT; -- WITH (isstrict,iscachable);
#if POSTGIS_GEOS_VERSION >= 30
-- Requires GEOS >= 3.0.0
-- Availability: 1.3.3