ogrlinearring.cpp

用于读取TAB、MIF、SHP文件的类

/******************************************************************************
 * $Id: ogrlinearring.cpp,v 1.27 2006/11/18 20:03:53 mloskot Exp $
 *
 * Project:  OpenGIS Simple Features Reference Implementation
 * Purpose:  The OGRLinearRing geometry class.
 * Author:   Frank Warmerdam, [e-mail]
 *
 ******************************************************************************
 * 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 1.27  2006/11/18 20:03:53  mloskot
 * Changed type of buffer size testers from size_t to int.
 *
 * Revision 1.26  2006/10/03 09:23:55  dron
 * Removed too verbosive debug output.
 *
 * Revision 1.25  2006/09/20 13:10:32  osemykin
 * Really fixed nBytesAvailable tests inside importFromWkb()
 *
 * Revision 1.24  2006/09/05 12:14:28  mloskot
 * Fixed nBytesAvailable tests inside importFromWkb()
 * in OGRLineString and OGRLinearRing classes.
 *
 * Revision 1.23  2006/07/15 09:12:44  mloskot
 * New fixes related to Bug 1195. Recent fixes had minor bugs.
 * NOTE: OGR autotests are failing so they may need some changes (in progress).
 *
 * Revision 1.22  2006/07/14 20:30:25  mloskot
 * Fixed new issue related to Bug 1195. Fixed Bug 313.
 *
 * Revision 1.21  2006/07/12 11:53:27  mloskot
 * Fixed Bug 1195 and Bug 1230.
 *
 * Revision 1.20  2006/06/19 23:19:45  mloskot
 * Added new functions OGRLinearRing::isPointInRing and OGRPolygon::IsPointOnSurface.
 *
 * Revision 1.19  2006/03/31 17:44:20  fwarmerdam
 * header updates
 *
 * Revision 1.18  2004/09/17 15:05:36  fwarmerdam
 * added get_Area() support
 *
 * Revision 1.17  2004/07/10 04:51:42  warmerda
 * added closeRings
 *
 * Revision 1.16  2004/02/21 15:36:14  warmerda
 * const correctness updates for geometry: bug 289
 *
 * Revision 1.15  2003/09/11 22:47:54  aamici
 * add class constructors and destructors where needed in order to
 * let the mingw/cygwin binutils produce sensible partially linked objet files
 * with 'ld -r'.
 *
 * Revision 1.14  2003/07/08 13:59:35  warmerda
 * added poSrcRing check in copy constructor, bug 361
 *
 * Revision 1.13  2003/05/28 19:16:42  warmerda
 * fixed up argument names and stuff for docs
 *
 * Revision 1.12  2003/01/14 22:13:35  warmerda
 * added isClockwise() method on OGRLinearRing
 *
 * Revision 1.11  2002/10/24 20:38:45  warmerda
 * fixed bug byte swapping point count in exporttowkb
 *
 * Revision 1.10  2002/05/02 19:44:53  warmerda
 * fixed 3D binary support for polygon/linearring
 *
 * Revision 1.9  2002/04/17 21:46:22  warmerda
 * Ensure padfZ copied in copy constructor.
 *
 * Revision 1.8  2002/02/22 22:24:31  warmerda
 * fixed 3d support in clone
 *
 * 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 1.27 2006/11/18 20:03:53 mloskot Exp $");

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

OGRLinearRing::OGRLinearRing()

{
}

/************************************************************************/
/*                          ~OGRLinearRing()                            */
/************************************************************************/
OGRLinearRing::~OGRLinearRing()

{
}

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

OGRLinearRing::OGRLinearRing( OGRLinearRing * poSrcRing )

{
    if( poSrcRing == NULL )
    {
        CPLDebug( "OGR", "OGRLinearRing::OGRLinearRing(OGRLinearRing*poSrcRing) - passed in ring is NULL!" );
        return;
    }

    setNumPoints( poSrcRing->getNumPoints() );

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

    if( poSrcRing->padfZ )
    {
        Make3D();
        memcpy( padfZ, poSrcRing->padfZ, sizeof(double) * getNumPoints() );
    }
}

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

const char * OGRLinearRing::getGeometryName() const 

{
    return "LINEARRING";
}

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

int OGRLinearRing::WkbSize() const

{
    return 0;
}

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

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

{
    (void) pabyData;
    (void) nSize;

    return OGRERR_UNSUPPORTED_OPERATION;
}

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

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

{
    (void) eByteOrder;
    (void) pabyData;

    return OGRERR_UNSUPPORTED_OPERATION;
}

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

OGRErr OGRLinearRing::_importFromWkb( OGRwkbByteOrder eByteOrder, int b3D, 
                                      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);

    /* Check if the wkb stream buffer is big enough to store
     * fetched number of points.
     * 16 or 24 - size of point structure
     */
    int nPointSize = (b3D ? 24 : 16);
    int nBufferMinSize = nPointSize * nNewNumPoints;
   
    if( nBufferMinSize > nBytesAvailable && nBytesAvailable > 0 )
    {
        CPLError( CE_Failure, CPLE_AppDefined,
                  "Length of input WKB is too small" );
        return OGRERR_NOT_ENOUGH_DATA;
    }

    /* (Re)Allocation of paoPoints buffer. */
    setNumPoints( nNewNumPoints );

    if( b3D )
        Make3D();
    else
        Make2D();
    
/* -------------------------------------------------------------------- */
/*      Get the vertices                                                */
/* -------------------------------------------------------------------- */
    int i = 0;
    int nBytesToCopy = 0;

    if( !b3D )
    {
        nBytesToCopy = 16 * nPointCount;
        
        if( nBytesToCopy > nBytesAvailable && nBytesAvailable > 0 )
        {
            CPLError( CE_Failure, CPLE_AppDefined,
                      "WKB buffer with OGRLinearRing points is too small! \
                      \n\tWKB stream may be corrupted or it is EWKB stream which is not supported");
            return OGRERR_NOT_ENOUGH_DATA;
        }