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/******************************************************************************
* Copyright (c) 1999, Carl Anderson
*
* this code is based in part on the earlier work of Frank Warmerdam
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
******************************************************************************
*
* shpcentrd.c - compute XY centroid for complex shapes
* and create a new SHPT_PT file of then
* specifically undo compound objects but not complex ones
*
*
* $Log: shpcentrd.c,v $
* Revision 1.3 2011-07-24 03:17:46 fwarmerdam
* include string.h and stdlib.h where needed in contrib (#2146)
*
* Revision 1.2 1999-05-26 02:56:31 candrsn
* updates to shpdxf, dbfinfo, port from Shapelib 1.1.5 of dbfcat and shpinfo
*
*
*
*/
/* the centroid is defined as
*
* Cx = sum (x dArea ) / Total Area
* and
* Cy = sum (y dArea ) / Total Area
*/
#include <stdlib.h>
#include <string.h>
#include "shapefil.h"
#include "shpgeo.h"
int main( int argc, char ** argv )
{
SHPHandle old_SHP, new_SHP;
DBFHandle old_DBF, new_DBF;
int nShapeType, nEntities, nVertices, nParts, *panParts, i, iPart;
double *padVertices, adBounds[4];
const char *pszPlus;
DBFFieldType idfld_type;
int idfld, nflds;
char kv[257] = "";
char idfldName[120] = "";
char fldName[120] = "";
char shpFileName[120] = "";
char dbfFileName[120] = "";
double apeture[4];
char *DBFRow = NULL;
int Cpan[2] = { 0,0 };
int byRing = 1;
PT Centrd;
SHPObject *psCShape, *cent_pt;
if( argc < 3 )
{
printf( "shpcentrd shp_file new_shp_file\n" );
exit( 1 );
}
old_SHP = SHPOpen (argv[1], "rb" );
old_DBF = DBFOpen (argv[1], "rb");
if( old_SHP == NULL || old_DBF == NULL )
{
printf( "Unable to open old files:%s\n", argv[1] );
exit( 1 );
}
SHPGetInfo( old_SHP, &nEntities, &nShapeType, NULL, NULL );
new_SHP = SHPCreate ( argv[2], SHPT_POINT );
new_DBF = DBFCloneEmpty (old_DBF, argv[2]);
if( new_SHP == NULL || new_DBF == NULL )
{
printf( "Unable to create new files:%s\n", argv[2] );
exit( 1 );
}
DBFRow = (char *) malloc ( (old_DBF->nRecordLength) + 15 );
#ifdef DEBUG
printf ("ShpCentrd using shpgeo \n");
#endif
for( i = 0; i < nEntities; i++ )
{
int res ;
psCShape = SHPReadObject( old_SHP, i );
if ( byRing == 1 ) {
int ring;
for ( ring = 0; ring < psCShape->nParts; ring ++ ) {
SHPObject *psO;
psO = SHPClone ( psCShape, ring, ring + 1 );
Centrd = SHPCentrd_2d ( psO );
cent_pt = SHPCreateSimpleObject ( SHPT_POINT, 1,
(double*) &(Centrd.x), (double*) &(Centrd.y), NULL );
SHPWriteObject ( new_SHP, -1, cent_pt );
memcpy ( DBFRow, DBFReadTuple ( old_DBF, i ),
old_DBF->nRecordLength );
DBFWriteTuple ( new_DBF, new_DBF->nRecords, DBFRow );
SHPDestroyObject ( cent_pt );
SHPDestroyObject ( psO );
}
}
else {
Centrd = SHPCentrd_2d ( psCShape );
cent_pt = SHPCreateSimpleObject ( SHPT_POINT, 1,
(double*) &(Centrd.x), (double*) &(Centrd.y), NULL );
SHPWriteObject ( new_SHP, -1, cent_pt );
memcpy ( DBFRow, DBFReadTuple ( old_DBF, i ),
old_DBF->nRecordLength );
DBFWriteTuple ( new_DBF, new_DBF->nRecords, DBFRow );
SHPDestroyObject ( cent_pt );
}
}
SHPClose( old_SHP );
SHPClose( new_SHP );
DBFClose( old_DBF );
DBFClose( new_DBF );
printf ("\n");
}