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https://git.osgeo.org/gitea/postgis/postgis
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90 lines
2 KiB
C
90 lines
2 KiB
C
#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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LWMPOINT *
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lwmpoint_deserialize(char *srl)
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{
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LWMPOINT *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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if ( type != MULTIPOINTTYPE )
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{
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lwerror("lwmpoint_deserialize called on NON multipoint: %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(LWMPOINT));
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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(LWPOINT *)*result->ngeoms);
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for (i=0; i<insp->ngeometries; i++)
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{
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result->geoms[i] = lwpoint_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 (multipoint:%d, point%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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// Add 'what' to this multipoint at position 'where'.
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// where=0 == prepend
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// where=-1 == append
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// Returns a MULTIPOINT or a COLLECTION
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LWGEOM *
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lwmpoint_add(const LWMPOINT *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("lwmpoint_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) == POINTTYPE ) newtype = MULTIPOINTTYPE;
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else newtype = COLLECTIONTYPE;
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col = lwcollection_construct(newtype,
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to->SRID,
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( TYPE_HASBBOX(what->type) || TYPE_HASBBOX(to->type) ),
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to->ngeoms+1, geoms);
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return (LWGEOM *)col;
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}
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