ogrgeometry.cpp

用于读取TAB、MIF、SHP文件的类

 * passed psEnvelope structure.
 *
 * This method is the same as the C function OGR_G_GetEnvelope().
 *
 * @param psEnvelope the structure in which to place the results.
 */

/************************************************************************/
/*                         OGR_G_GetEnvelope()                          */
/************************************************************************/
/**
 * Computes and returns the bounding envelope for this geometry in the
 * passed psEnvelope structure.
 *
 * This function is the same as the CPP method OGRGeometry::getEnvelope().
 *
 * @param hGeom handle of the geometry to get envelope from.
 * @param psEnvelope the structure in which to place the results.
 */

void OGR_G_GetEnvelope( OGRGeometryH hGeom, OGREnvelope *psEnvelope )

{
    ((OGRGeometry *) hGeom)->getEnvelope( psEnvelope );
}

/**
 * \fn OGRErr OGRGeometry::importFromWkb( unsigned char * pabyData, int nSize);
 *
 * Assign geometry from well known binary data.
 *
 * The object must have already been instantiated as the correct derived
 * type of geometry object to match the binaries type.  This method is used
 * by the OGRGeometryFactory class, but not normally called by application
 * code.  
 * 
 * This method relates to the SFCOM IWks::ImportFromWKB() method.
 *
 * This method is the same as the C function OGR_G_ImportFromWkb().
 *
 * @param pabyData the binary input data.
 * @param nSize the size of pabyData in bytes, or zero if not known.
 *
 * @return OGRERR_NONE if all goes well, otherwise any of
 * OGRERR_NOT_ENOUGH_DATA, OGRERR_UNSUPPORTED_GEOMETRY_TYPE, or
 * OGRERR_CORRUPT_DATA may be returned.
 */

/************************************************************************/
/*                        OGR_G_ImportFromWkb()                         */
/************************************************************************/
/**
 * Assign geometry from well known binary data.
 *
 * The object must have already been instantiated as the correct derived
 * type of geometry object to match the binaries type.
 *
 * This function relates to the SFCOM IWks::ImportFromWKB() method.
 *
 * This function is the same as the CPP method OGRGeometry::importFromWkb().
 *
 * @param hGeom handle on the geometry to assign the well know binary data to.
 * @param pabyData the binary input data.
 * @param nSize the size of pabyData in bytes, or zero if not known.
 *
 * @return OGRERR_NONE if all goes well, otherwise any of
 * OGRERR_NOT_ENOUGH_DATA, OGRERR_UNSUPPORTED_GEOMETRY_TYPE, or
 * OGRERR_CORRUPT_DATA may be returned.
 */

OGRErr OGR_G_ImportFromWkb( OGRGeometryH hGeom, 
                            unsigned char *pabyData, int nSize )

{
    return ((OGRGeometry *) hGeom)->importFromWkb( pabyData, nSize );
}

/**
 * \fn OGRErr OGRGeometry::exportToWkb( OGRwkbByteOrder eByteOrder,
                                        unsigned char * pabyData ) const;
 *
 * Convert a geometry into well known binary format.
 *
 * This method relates to the SFCOM IWks::ExportToWKB() method.
 *
 * This method is the same as the C function OGR_G_ExportToWkb().
 *
 * @param eByteOrder One of wkbXDR or wkbNDR indicating MSB or LSB byte order
 *               respectively.
 * @param pabyData a buffer into which the binary representation is
 *                      written.  This buffer must be at least
 *                      OGRGeometry::WkbSize() byte in size.
 *
 * @return Currently OGRERR_NONE is always returned.
 */

/************************************************************************/
/*                         OGR_G_ExportToWkb()                          */
/************************************************************************/
/**
 * Convert a geometry into well known binary format.
 *
 * This function relates to the SFCOM IWks::ExportToWKB() method.
 *
 * This function is the same as the CPP method OGRGeometry::exportToWkb().
 *
 * @param hGeom handle on the geometry to convert to a well know binary 
 * data from.
 * @param eOrder One of wkbXDR or wkbNDR indicating MSB or LSB byte order
 *               respectively.
 * @param pabyDstBuffer a buffer into which the binary representation is
 *                      written.  This buffer must be at least
 *                      OGR_G_WkbSize() byte in size.
 *
 * @return Currently OGRERR_NONE is always returned.
 */

OGRErr OGR_G_ExportToWkb( OGRGeometryH hGeom, OGRwkbByteOrder eOrder,
                          unsigned char *pabyDstBuffer )

{
    return ((OGRGeometry *) hGeom)->exportToWkb( eOrder, pabyDstBuffer );
}

/**
 * \fn OGRErr OGRGeometry::importFromWkt( char ** ppszInput );
 *
 * Assign geometry from well known text data.
 *
 * The object must have already been instantiated as the correct derived
 * type of geometry object to match the text type.  This method is used
 * by the OGRGeometryFactory class, but not normally called by application
 * code.  
 * 
 * This method relates to the SFCOM IWks::ImportFromWKT() method.
 *
 * This method is the same as the C function OGR_G_ImportFromWkt().
 *
 * @param ppszInput pointer to a pointer to the source text.  The pointer is
 *                    updated to pointer after the consumed text.
 *
 * @return OGRERR_NONE if all goes well, otherwise any of
 * OGRERR_NOT_ENOUGH_DATA, OGRERR_UNSUPPORTED_GEOMETRY_TYPE, or
 * OGRERR_CORRUPT_DATA may be returned.
 */

/************************************************************************/
/*                        OGR_G_ImportFromWkt()                         */
/************************************************************************/
/**
 * Assign geometry from well known text data.
 *
 * The object must have already been instantiated as the correct derived
 * type of geometry object to match the text type.
 * 
 * This function relates to the SFCOM IWks::ImportFromWKT() method.
 *
 * This function is the same as the CPP method OGRGeometry::importFromWkt().
 *
 * @param hGeom handle on the  geometry to assign well know text data to.
 * @param ppszSrcText pointer to a pointer to the source text.  The pointer is
 *                    updated to pointer after the consumed text.
 *
 * @return OGRERR_NONE if all goes well, otherwise any of
 * OGRERR_NOT_ENOUGH_DATA, OGRERR_UNSUPPORTED_GEOMETRY_TYPE, or
 * OGRERR_CORRUPT_DATA may be returned.
 */

OGRErr OGR_G_ImportFromWkt( OGRGeometryH hGeom, char ** ppszSrcText )

{
    return ((OGRGeometry *) hGeom)->importFromWkt( ppszSrcText );
}

/**
 * \fn OGRErr OGRGeometry::exportToWkt( char ** ppszDstText ) const;
 *
 * Convert a geometry into well known text format.
 *
 * This method relates to the SFCOM IWks::ExportToWKT() method.
 *
 * This method is the same as the C function OGR_G_ExportToWkt().
 *
 * @param ppszDstText a text buffer is allocated by the program, and assigned
 *                    to the passed pointer.
 *
 * @return Currently OGRERR_NONE is always returned.
 */

/************************************************************************/
/*                         OGR_G_ExportToWkt()                          */
/************************************************************************/
/**
 * Convert a geometry into well known text format.
 *
 * This function relates to the SFCOM IWks::ExportToWKT() method.
 *
 * This function is the same as the CPP method OGRGeometry::exportToWkt().
 *
 * @param hGeom handle on the geometry to convert to a text format from.
 * @param ppszSrcText a text buffer is allocated by the program, and assigned
                       to the passed pointer.
 *
 * @return Currently OGRERR_NONE is always returned.
 */

OGRErr OGR_G_ExportToWkt( OGRGeometryH hGeom, char **ppszSrcText )

{
    return ((OGRGeometry *) hGeom)->exportToWkt( ppszSrcText );
}

/**
 * \fn OGRwkbGeometryType OGRGeometry::getGeometryType() const;
 *
 * Fetch geometry type.
 *
 * Note that the geometry type may include the 2.5D flag.  To get a 2D
 * flattened version of the geometry type apply the wkbFlatten() macro
 * to the return result.
 *
 * This method is the same as the C function OGR_G_GetGeometryType().
 *
 * @return the geometry type code.
 */

/************************************************************************/
/*                       OGR_G_GetGeometryType()                        */
/************************************************************************/
/**
 * Fetch geometry type.
 *
 * Note that the geometry type may include the 2.5D flag.  To get a 2D
 * flattened version of the geometry type apply the wkbFlatten() macro
 * to the return result.
 *
 * This function is the same as the CPP method OGRGeometry::getGeometryType().
 *
 * @param hGeom handle on the geometry to get type from.
 * @return the geometry type code.
 */

OGRwkbGeometryType OGR_G_GetGeometryType( OGRGeometryH hGeom )

{
    return ((OGRGeometry *) hGeom)->getGeometryType();
}

/**
 * \fn const char * OGRGeometry::getGeometryName() const;
 *
 * Fetch WKT name for geometry type.
 *
 * There is no SFCOM analog to this method.  
 *
 * This method is the same as the C function OGR_G_GetGeometryName().
 *
 * @return name used for this geometry type in well known text format.  The
 * returned pointer is to a static internal string and should not be modified
 * or freed.
 */

/************************************************************************/
/*                       OGR_G_GetGeometryName()                        */
/************************************************************************/
/**
 * Fetch WKT name for geometry type.
 *
 * There is no SFCOM analog to this function.  
 *
 * This function is the same as the CPP method OGRGeometry::getGeometryName().
 *
 * @param hGeom handle on the geometry to get name from.
 * @return name used for this geometry type in well known text format.
 */

const char *OGR_G_GetGeometryName( OGRGeometryH hGeom )

{
    return ((OGRGeometry *) hGeom)->getGeometryName();
}

/**
 * \fn OGRGeometry *OGRGeometry::clone() const;
 *
 * Make a copy of this object.
 *
 * This method relates to the SFCOM IGeometry::clone() method.
 *
 * This method is the same as the C function OGR_G_Clone().
 * 
 * @return a new object instance with the same geometry, and spatial
 * reference system as the original.
 */

/************************************************************************/
/*                            OGR_G_Clone()                             */
/************************************************************************/
/**
 * Make a copy of this object.
 *
 * This function relates to the SFCOM IGeometry::clone() method.
 *
 * This function is the same as the CPP method OGRGeometry::clone().
 * 
 * @param hGeom handle on the geometry to clone from.
 * @return an handle on the  copy of the geometry with the spatial
 * reference system as the original.
 */

OGRGeometryH OGR_G_Clone( OGRGeometryH hGeom )

{
    return (OGRGeometryH) ((OGRGeometry *) hGeom)->clone();
}

/**
 * \fn OGRSpatialReference *OGRGeometry::getSpatialReference();
 *
 * Returns spatial reference system for object.
 *
 * This method relates to the SFCOM IGeometry::get_SpatialReference() method.
 *
 * This method is the same as the C function OGR_G_GetSpatialReference().
 *
 * @return a reference to the spatial reference object.  The object may be
 * shared with many geometry objects, and should not be modified.
 */

/************************************************************************/
/*                     OGR_G_GetSpatialReference()                      */
/************************************************************************/
/**
 * Returns spatial reference system for geometry.
 *
 * This function relates to the SFCOM IGeometry::get_SpatialReference() method.
 *
 * This function is the same as the CPP method 
 * OGRGeometry::getSpatialReference().
 *
 * @param hGeom handle on the geometry to get spatial reference from.
 * @return a reference to the spatial reference geometry.
 */

OGRSpatialReferenceH OGR_G_GetSpatialReference( OGRGeometryH hGeom )

{
    return (OGRSpatialReferenceH) 
        ((OGRGeometry *) hGeom)->getSpatialReference();
}

/**
 * \fn void OGRGeometry::empty();
 *
 * Clear geometry information.  This restores the geometry to it's initial
 * state after construction, and before assignment of actual geometry.
 *
 * This method relates to the SFCOM IGeometry::Empty() method.
 *
 * This method is the same as the C function OGR_G_Empty().
 */

/************************************************************************/
/*                            OGR_G_Empty()                             */
/************************************************************************/
/**
 * Clear geometry information.  This restores the geometry to it's initial
 * state after construction, and before assignment of actual geometry.
 *
 * This function relates to the SFCOM IGeometry::Empty() method.
 *
 * This function is the same as the CPP method OGRGeometry::empty().
 *
 * @param hGeom handle on the geometry to empty.
 */

void OGR_G_Empty( OGRGeometryH hGeom )

{
    ((OGRGeometry *) hGeom)->empty();
}

/************************************************************************/
/*                       OGRGeometryTypeToName()                        */
/************************************************************************/

/**
 * Fetch a human readable name corresponding to an OGRwkBGeometryType value.
 * The returned value should not be modified, or freed by the application.
 *
 * This function is C callable.
 *
 * @param eType the geometry type.
 *
 * @return internal human readable string, or NULL on failure.
 */

const char *OGRGeometryTypeToName( OGRwkbGeometryType eType )

{
    switch( eType )
    {
      case wkbUnknown:
        return "Unknown (any)";
        
      case wkbPoint:
        return "Point";