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/**********************************************************************
* $Id: lwgeom_sqlmm.c 5181 2010-02-01 17:35:55Z pramsey $
*
* PostGIS - Spatial Types for PostgreSQL
* http://postgis.refractions.net
* Copyright 2001-2006 Refractions Research Inc.
*
* This is free software; you can redistribute and/or modify it under
* the terms of the GNU General Public Licence. See the COPYING file.
*
**********************************************************************/
#include "postgres.h"
#include "liblwgeom.h"
#include "fmgr.h"
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <math.h>
#include "lwgeom_pg.h"
Datum LWGEOM_has_arc(PG_FUNCTION_ARGS);
Datum LWGEOM_curve_segmentize(PG_FUNCTION_ARGS);
Datum LWGEOM_line_desegmentize(PG_FUNCTION_ARGS);
/*******************************************************************************
* Begin PG_FUNCTIONs
******************************************************************************/
PG_FUNCTION_INFO_V1(LWGEOM_has_arc);
Datum LWGEOM_has_arc(PG_FUNCTION_ARGS)
{
PG_LWGEOM *geom = (PG_LWGEOM *)PG_DETOAST_DATUM(PG_GETARG_DATUM(0));
uint32 result = has_arc(lwgeom_deserialize(SERIALIZED_FORM(geom)));
PG_RETURN_BOOL(result == 1);
}
/*
* Converts any curve segments of the geometry into a linear approximation.
* Curve centers are determined by projecting the defining points into the 2d
* plane. Z and M values are assigned by linear interpolation between
* defining points.
*/
PG_FUNCTION_INFO_V1(LWGEOM_curve_segmentize);
Datum LWGEOM_curve_segmentize(PG_FUNCTION_ARGS)
{
PG_LWGEOM *geom = (PG_LWGEOM *)PG_DETOAST_DATUM(PG_GETARG_DATUM(0));
uint32 perQuad = PG_GETARG_INT32(1);
PG_LWGEOM *ret;
LWGEOM *igeom = NULL, *ogeom = NULL;
POSTGIS_DEBUG(2, "LWGEOM_curve_segmentize called.");
if (perQuad < 0)
{
elog(ERROR, "2nd argument must be positive.");
PG_RETURN_NULL();
}
#if POSTGIS_DEBUG_LEVEL > 0
else
{
POSTGIS_DEBUGF(3, "perQuad = %d", perQuad);
}
#endif
igeom = lwgeom_deserialize(SERIALIZED_FORM(geom));
if ( ! has_arc(igeom) )
{
PG_RETURN_POINTER(geom);
}
ogeom = lwgeom_segmentize(igeom, perQuad);
if (ogeom == NULL) PG_RETURN_NULL();
ret = pglwgeom_serialize(ogeom);
lwgeom_release(igeom);
lwgeom_release(ogeom);
PG_FREE_IF_COPY(geom, 0);
PG_RETURN_POINTER(ret);
}
PG_FUNCTION_INFO_V1(LWGEOM_line_desegmentize);
Datum LWGEOM_line_desegmentize(PG_FUNCTION_ARGS)
{
PG_LWGEOM *geom = (PG_LWGEOM *)PG_DETOAST_DATUM(PG_GETARG_DATUM(0));
PG_LWGEOM *ret;
LWGEOM *igeom = NULL, *ogeom = NULL;
POSTGIS_DEBUG(2, "LWGEOM_line_desegmentize.");
igeom = lwgeom_deserialize(SERIALIZED_FORM(geom));
ogeom = lwgeom_desegmentize(igeom);
if (ogeom == NULL)
{
lwgeom_release(igeom);
PG_RETURN_NULL();
}
ret = pglwgeom_serialize(ogeom);
lwgeom_release(igeom);
lwgeom_release(ogeom);
PG_FREE_IF_COPY(geom, 0);
PG_RETURN_POINTER(ret);
}
/*******************************************************************************
* End PG_FUNCTIONs
******************************************************************************/
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