ogrpoint.cpp

用于读取TAB、MIF、SHP文件的类

/******************************************************************************
 * $Id: ogrpoint.cpp,v 1.38 2006/06/27 14:54:16 fwarmerdam Exp $
 *
 * Project:  OpenGIS Simple Features Reference Implementation
 * Purpose:  The Point 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: ogrpoint.cpp,v $
 * Revision 1.38  2006/06/27 14:54:16  fwarmerdam
 * ensure setCoordinateDimension(2) clears z
 *
 * Revision 1.37  2006/03/31 17:44:20  fwarmerdam
 * header updates
 *
 * Revision 1.36  2006/01/06 19:04:13  fwarmerdam
 * fix clone to preserve coordinate dimension
 *
 * Revision 1.35  2005/09/12 01:43:40  fwarmerdam
 * ensure Z is initialized to zero in 2D constructor
 *
 * Revision 1.34  2005/08/04 17:18:59  fwarmerdam
 * now have separate 2D and 3D OGRPoint constructors
 *
 * Revision 1.33  2005/07/22 20:39:36  fwarmerdam
 * Fixed getGeometryType to look at coordinate dimension, expand wkt buffer.
 *
 * Revision 1.32  2005/07/20 01:43:51  fwarmerdam
 * upgraded OGR geometry dimension handling
 *
 * Revision 1.31  2005/07/12 17:34:00  fwarmerdam
 * updated to produce proper empty syntax and consume either
 *
 * Revision 1.30  2005/04/06 20:43:00  fwarmerdam
 * fixed a variety of method signatures for documentation
 *
 * Revision 1.29  2005/02/22 12:38:01  fwarmerdam
 * rename Equal/Intersect to Equals/Intersects
 *
 * Revision 1.28  2004/02/22 10:03:40  dron
 * Fix compirison casting problems in OGRPoint::Equal() method.
 *
 * Revision 1.27  2004/02/21 15:36:14  warmerda
 * const correctness updates for geometry: bug 289
 *
 * Revision 1.26  2004/01/16 21:57:17  warmerda
 * fixed up EMPTY support
 *
 * Revision 1.25  2004/01/16 21:20:00  warmerda
 * Added EMPTY support
 *
 * Revision 1.24  2003/08/27 15:40:37  warmerda
 * added support for generating DB2 V7.2 compatible WKB
 *
 * Revision 1.23  2003/06/09 13:48:54  warmerda
 * added DB2 V7.2 byte order hack
 *
 * Revision 1.22  2003/05/28 19:16:43  warmerda
 * fixed up argument names and stuff for docs
 *
 * Revision 1.21  2003/03/07 21:28:56  warmerda
 * support 0x8000 style 3D WKB flags
 *
 * Revision 1.20  2003/02/08 00:37:14  warmerda
 * try to improve documentation
 *
 * Revision 1.19  2002/09/11 13:47:17  warmerda
 * preliminary set of fixes for 3D WKB enum
 *
 * Revision 1.18  2002/05/02 19:45:36  warmerda
 * added flattenTo2D() method
 *
 * Revision 1.17  2001/11/01 17:20:33  warmerda
 * added DISABLE_OGRGEOM_TRANSFORM macro
 *
 * Revision 1.16  2001/11/01 17:01:28  warmerda
 * pass output buffer into OGRMakeWktCoordinate
 *
 * Revision 1.15  2001/09/21 16:24:20  warmerda
 * added transform() and transformTo() methods
 *
 * Revision 1.14  2001/07/18 05:03:05  warmerda
 * added CPL_CVSID
 *
 * Revision 1.13  1999/11/18 19:02:19  warmerda
 * expanded tabs
 *
 * Revision 1.12  1999/09/13 14:34:07  warmerda
 * updated to use wkbZ of 0x8000 instead of 0x80000000
 *
 * Revision 1.11  1999/09/13 02:27:33  warmerda
 * incorporated limited 2.5d support
 *
 * Revision 1.10  1999/07/27 00:48:11  warmerda
 * Added Equal() support
 *
 * Revision 1.9  1999/07/06 21:36:47  warmerda
 * tenatively added getEnvelope() and Intersect()
 *
 * Revision 1.8  1999/06/25 20:44:43  warmerda
 * implemented assignSpatialReference, carry properly
 *
 * Revision 1.7  1999/05/31 20:42:13  warmerda
 * added empty method
 *
 * Revision 1.6  1999/05/31 14:59:06  warmerda
 * added documentation
 *
 * Revision 1.5  1999/05/31 11:05:08  warmerda
 * added some documentation
 *
 * Revision 1.4  1999/05/23 05:34:40  warmerda
 * added support for clone(), multipolygons and geometry collections
 *
 * Revision 1.3  1999/05/20 14:35:44  warmerda
 * added support for well known text format
 *
 * Revision 1.2  1999/03/30 21:21:43  warmerda
 * added linearring/polygon support
 *
 * Revision 1.1  1999/03/29 21:21:10  warmerda
 * New
 *
 */

#include "ogr_geometry.h"
#include "ogr_p.h"
#include <assert.h>

CPL_CVSID("$Id: ogrpoint.cpp,v 1.38 2006/06/27 14:54:16 fwarmerdam Exp $");

/************************************************************************/
/*                              OGRPoint()                              */
/************************************************************************/

/**
 * Create a (0,0) point.
 */

OGRPoint::OGRPoint()

{
    x = 0;
    y = 0;
    z = 0;
}

/************************************************************************/
/*                              OGRPoint()                              */
/*                                                                      */
/*      Initialize point to value.                                      */
/************************************************************************/

OGRPoint::OGRPoint( double xIn, double yIn, double zIn )

{
    x = xIn;
    y = yIn;
    z = zIn;
    nCoordDimension = 3;
}

/************************************************************************/
/*                              OGRPoint()                              */
/*                                                                      */
/*      Initialize point to value.                                      */
/************************************************************************/

OGRPoint::OGRPoint( double xIn, double yIn )

{
    x = xIn;
    y = yIn;
    z = 0.0;
    nCoordDimension = 2;
}

/************************************************************************/
/*                             ~OGRPoint()                              */
/************************************************************************/

OGRPoint::~OGRPoint()

{
}

/************************************************************************/
/*                               clone()                                */
/*                                                                      */
/*      Make a new object that is a copy of this object.                */
/************************************************************************/

OGRGeometry *OGRPoint::clone() const

{
    OGRPoint    *poNewPoint = new OGRPoint( x, y, z );

    poNewPoint->assignSpatialReference( getSpatialReference() );
    poNewPoint->setCoordinateDimension( nCoordDimension );

    return poNewPoint;
}

/************************************************************************/
/*                               empty()                                */
/************************************************************************/
void OGRPoint::empty()

{
    x = y = z = 0.0;
}

/************************************************************************/
/*                            getDimension()                            */
/************************************************************************/

int OGRPoint::getDimension() const

{
    return 0;
}

/************************************************************************/
/*                          getGeometryType()                           */
/************************************************************************/

OGRwkbGeometryType OGRPoint::getGeometryType() const

{
    if( nCoordDimension < 3 )
        return wkbPoint;
    else
        return wkbPoint25D;
}

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

const char * OGRPoint::getGeometryName() const

{
    return "POINT";
}

/************************************************************************/
/*                            flattenTo2D()                             */
/************************************************************************/

void OGRPoint::flattenTo2D()

{
    z = 0;
    nCoordDimension = 2;
}

/************************************************************************/
/*                       setCoordinateDimension()                       */
/************************************************************************/

void OGRPoint::setCoordinateDimension( int nNewDimension )

{
    nCoordDimension = nNewDimension;
    
    if( nCoordDimension == 2 )
        z = 0;
}

/************************************************************************/
/*                              WkbSize()                               */
/*                                                                      */
/*      Return the size of this object in well known binary             */
/*      representation including the byte order, and type information.  */
/************************************************************************/

int OGRPoint::WkbSize() const

{
    if( nCoordDimension != 3 )
        return 21;
    else
        return 29;
}

/************************************************************************/
/*                           importFromWkb()                            */
/*                                                                      */
/*      Initialize from serialized stream in well known binary          */
/*      format.                                                         */
/************************************************************************/

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

{
    OGRwkbByteOrder     eByteOrder;
    
    if( nSize < 21 && nSize != -1 )
        return OGRERR_NOT_ENOUGH_DATA;

/* -------------------------------------------------------------------- */