/******************************************************************************
 * $Id: ogrlinearring.cpp,v 1.7 2001/07/18 05:03:05 warmerda Exp $
 *
 * Project:  OpenGIS Simple Features Reference Implementation
 * Purpose:  The OGRLinearRing geometry class.
 * Author:   Frank Warmerdam, warmerda@home.com
 *
 ******************************************************************************
 * Copyright (c) 1999, 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.
 ******************************************************************************
 *
 * $Log: ogrlinearring.cpp,v $
 * Revision 1.7  2001/07/18 05:03:05  warmerda
 * added CPL_CVSID
 *
 * Revision 1.6  1999/11/18 19:02:19  warmerda
 * expanded tabs
 *
 * Revision 1.5  1999/07/08 20:25:39  warmerda
 * Remove getGeometryType() method ... now returns wkbLineString.
 *
 * Revision 1.4  1999/06/25 20:44:43  warmerda
 * implemented assignSpatialReference, carry properly
 *
 * Revision 1.3  1999/05/23 05:34:40  warmerda
 * added support for clone(), multipolygons and geometry collections
 *
 * Revision 1.2  1999/05/20 14:35:44  warmerda
 * added support for well known text format
 *
 * Revision 1.1  1999/03/30 21:21:05  warmerda
 * New
 *
 */

#include "ogr_geometry.h"
#include "ogr_p.h"

CPL_CVSID("$Id: ogrlinearring.cpp,v 1.7 2001/07/18 05:03:05 warmerda Exp $");

/************************************************************************/
/*                           OGRLinearRing()                            */
/************************************************************************/

OGRLinearRing::OGRLinearRing()

{
}

/************************************************************************/
/*                           OGRLinearRing()                            */
/************************************************************************/

OGRLinearRing::OGRLinearRing( OGRLinearRing * poSrcRing )

{
    setNumPoints( poSrcRing->getNumPoints() );

    memcpy( paoPoints, poSrcRing->paoPoints,
            sizeof(OGRRawPoint) * getNumPoints() );
}

/************************************************************************/
/*                          getGeometryName()                           */
/************************************************************************/

const char * OGRLinearRing::getGeometryName()

{
    return "LINEARRING";
}

/************************************************************************/
/*                              WkbSize()                               */
/*                                                                      */
/*      Disable this method.                                            */
/************************************************************************/

int OGRLinearRing::WkbSize()

{
    return 0;
}

/************************************************************************/
/*                           importFromWkb()                            */
/*                                                                      */
/*      Disable method for this class.                                  */
/************************************************************************/

OGRErr OGRLinearRing::importFromWkb( unsigned char *, int )

{
    return OGRERR_UNSUPPORTED_OPERATION;
}

/************************************************************************/
/*                            exportToWkb()                             */
/*                                                                      */
/*      Disable method for this class.                                  */
/************************************************************************/

OGRErr OGRLinearRing::exportToWkb( OGRwkbByteOrder, unsigned char * )

{
    return OGRERR_UNSUPPORTED_OPERATION;
}

/************************************************************************/
/*                           _importFromWkb()                           */
/*                                                                      */
/*      Helper method for OGRPolygon.  NOT A NORMAL importFromWkb()     */
/*      method!                                                         */
/************************************************************************/

OGRErr OGRLinearRing::_importFromWkb( OGRwkbByteOrder eByteOrder,
                                     unsigned char * pabyData,
                                     int nBytesAvailable )

{
    if( nBytesAvailable < 4 && nBytesAvailable != -1 )
        return OGRERR_NOT_ENOUGH_DATA;

/* -------------------------------------------------------------------- */
/*      Get the vertex count.                                           */
/* -------------------------------------------------------------------- */
    int         nNewNumPoints;
    
    memcpy( &nNewNumPoints, pabyData, 4 );
    
    if( OGR_SWAP( eByteOrder ) )
        nNewNumPoints = CPL_SWAP32(nNewNumPoints);

    setNumPoints( nNewNumPoints );
    
/* -------------------------------------------------------------------- */
/*      Get the vertices                                                */
/* -------------------------------------------------------------------- */
    memcpy( paoPoints, pabyData + 4, 16 * nPointCount );
    
    if( OGR_SWAP( eByteOrder ) )
    {
        for( int i = 0; i < nPointCount; i++ )
        {
            CPL_SWAPDOUBLE( &(paoPoints[i].x) );
            CPL_SWAPDOUBLE( &(paoPoints[i].y) );
        }
    }

    return OGRERR_NONE;
}

/************************************************************************/
/*                            _exportToWkb()                            */
/*                                                                      */
/*      Helper method for OGRPolygon.  THIS IS NOT THE NORMAL           */
/*      exportToWkb() METHOD!                                           */
/************************************************************************/

OGRErr  OGRLinearRing::_exportToWkb( OGRwkbByteOrder eByteOrder,
                                     unsigned char * pabyData )

{
/* -------------------------------------------------------------------- */
/*      Copy in the raw data.                                           */
/* -------------------------------------------------------------------- */
    memcpy( pabyData, &nPointCount, 4 );

/* -------------------------------------------------------------------- */
/*      Copy in the raw data.                                           */
/* -------------------------------------------------------------------- */
    memcpy( pabyData+4, paoPoints, 16 * nPointCount );

/* -------------------------------------------------------------------- */
/*      Swap if needed.                                                 */
/* -------------------------------------------------------------------- */
    if( OGR_SWAP( eByteOrder ) )
    {
        int     nCount;

        nCount = CPL_SWAP32( nPointCount );
        memcpy( pabyData+4, &nCount, 4 );

        for( int i = 0; i < nPointCount; i++ )
        {
            CPL_SWAPDOUBLE( pabyData + 4 + 16 * i );
            CPL_SWAPDOUBLE( pabyData + 4 + 16 * i + 8 );
        }
    }
    
    return OGRERR_NONE;
}

/************************************************************************/
/*                              _WkbSize()                              */
/*                                                                      */
/*      Helper method for OGRPolygon.  NOT THE NORMAL WkbSize() METHOD! */
/************************************************************************/

int OGRLinearRing::_WkbSize()

{
    return 4 + 16 * nPointCount;
}

/************************************************************************/
/*                               clone()                                */
/*                                                                      */
/*      We override the OGRCurve clone() to ensure that we get the      */
/*      correct virtual table.                                          */
/************************************************************************/

OGRGeometry *OGRLinearRing::clone()

{
    OGRLinearRing       *poNewLinearRing;

    poNewLinearRing = new OGRLinearRing();
    poNewLinearRing->assignSpatialReference( getSpatialReference() );

    poNewLinearRing->setPoints( nPointCount, paoPoints );

    return poNewLinearRing;
}
