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113 lines
2.6 KiB
C
113 lines
2.6 KiB
C
/**********************************************************************
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* $Id: lwmpoly.c 2797 2008-05-31 09:56:44Z mcayland $
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*
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* PostGIS - Spatial Types for PostgreSQL
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* http://postgis.refractions.net
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* Copyright 2001-2006 Refractions Research Inc.
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*
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* This is free software; you can redistribute and/or modify it under
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* the terms of the GNU General Public Licence. See the COPYING file.
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*
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**********************************************************************/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "liblwgeom.h"
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LWMPOLY *
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lwmpoly_deserialize(uchar *srl)
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{
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LWMPOLY *result;
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LWGEOM_INSPECTED *insp;
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int type = lwgeom_getType(srl[0]);
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int i;
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LWDEBUG(2, "lwmpoly_deserialize called");
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if ( type != MULTIPOLYGONTYPE )
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{
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lwerror("lwmpoly_deserialize called on NON multipoly: %d",
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type);
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return NULL;
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}
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insp = lwgeom_inspect(srl);
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result = lwalloc(sizeof(LWMPOLY));
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result->type = insp->type;
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result->SRID = insp->SRID;
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result->ngeoms = insp->ngeometries;
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result->geoms = lwalloc(sizeof(LWPOLY *)*insp->ngeometries);
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if (lwgeom_hasBBOX(srl[0]))
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{
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result->bbox = lwalloc(sizeof(BOX2DFLOAT4));
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memcpy(result->bbox, srl+1, sizeof(BOX2DFLOAT4));
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}
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else result->bbox = NULL;
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for (i=0; i<insp->ngeometries; i++)
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{
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result->geoms[i] = lwpoly_deserialize(insp->sub_geoms[i]);
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if ( TYPE_NDIMS(result->geoms[i]->type) != TYPE_NDIMS(result->type) )
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{
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lwerror("Mixed dimensions (multipoly:%d, poly%d:%d)",
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TYPE_NDIMS(result->type), i,
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TYPE_NDIMS(result->geoms[i]->type)
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);
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return NULL;
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}
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}
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return result;
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}
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/*
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* Add 'what' to this multiline at position 'where'.
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* where=0 == prepend
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* where=-1 == append
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* Returns a MULTIPOLY or a COLLECTION
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*/
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LWGEOM *
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lwmpoly_add(const LWMPOLY *to, uint32 where, const LWGEOM *what)
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{
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LWCOLLECTION *col;
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LWGEOM **geoms;
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int newtype;
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uint32 i;
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if ( where == -1 ) where = to->ngeoms;
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else if ( where < -1 || where > to->ngeoms )
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{
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lwerror("lwmline_add: add position out of range %d..%d",
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-1, to->ngeoms);
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return NULL;
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}
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/* dimensions compatibility are checked by caller */
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/* Construct geoms array */
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geoms = lwalloc(sizeof(LWGEOM *)*(to->ngeoms+1));
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for (i=0; i<where; i++)
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{
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geoms[i] = lwgeom_clone((LWGEOM *)to->geoms[i]);
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}
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geoms[where] = lwgeom_clone(what);
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for (i=where; i<to->ngeoms; i++)
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{
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geoms[i+1] = lwgeom_clone((LWGEOM *)to->geoms[i]);
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}
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if ( TYPE_GETTYPE(what->type) == POLYGONTYPE ) newtype = MULTIPOLYGONTYPE;
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else newtype = COLLECTIONTYPE;
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col = lwcollection_construct(newtype,
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to->SRID, NULL,
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to->ngeoms+1, geoms);
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return (LWGEOM *)col;
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}
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