long.cpp

来自「提取各种NEMA0183格式数据的类编程。」· C++ 代码 · 共 146 行

/*
** Author: Samuel R. Blackburn
** Internet: [e-mail]
**
** Copyright, 1997-2005, Samuel R. Blackburn
**
** "You can get credit for something or get it done, but not both."
** Dr. Richard Garwin
**
** BSD License follows.
**
** Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions
** are met:
**
** Redistributions of source code must retain the above copyright notice,
** this list of conditions and the following disclaimer. Redistributions
** in binary form must reproduce the above copyright notice, this list
** of conditions and the following disclaimer in the documentation and/or
** other materials provided with the distribution. Neither the name of
** the WFC nor the names of its contributors may be used to endorse or
** promote products derived from this software without specific prior
** written permission.
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
**
** $Workfile: long.cpp $
** $Revision: 6 $
** $Modtime: 10/12/98 6:50a $
*/

#include "nmea0183.h"
#pragma hdrstop

#if defined( _DEBUG ) && defined( _INC_CRTDBG )
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#define new DEBUG_NEW
#endif // _DEBUG

LONGITUDE::LONGITUDE()
{
   Empty();
}

LONGITUDE::~LONGITUDE()
{
   Empty();
}

void LONGITUDE::Empty( void )
{
   Longitude = 0.0;
   Easting   = EW_Unknown;
}

BOOL LONGITUDE::IsDataValid( void )
{
   if ( Easting != East && Easting != West )
   {
      return( FALSE );
   }

   return( TRUE );
}

void LONGITUDE::Parse( int position_field_number, int east_or_west_field_number, const SENTENCE& sentence )
{
   // Thanks go to Eric Parsonage ([e-mail]) for finding a nasty
   // little bug that used to live here.

   double position = sentence.Double( position_field_number );

   CString east_or_west;

   east_or_west = sentence.Field( east_or_west_field_number );

   Set( position, east_or_west );
}

void LONGITUDE::Set( double position, const char *east_or_west )
{
   ASSERT( east_or_west != NULL );

   Longitude  = position;
   Coordinate = position;

   if ( east_or_west[ 0 ] == 'E' )
   {
      Easting = East;
   }
   else if ( east_or_west[ 0 ] == 'W' )
   {
      Easting = West;
   }
   else
   {
      Easting = EW_Unknown;
   }
}

void LONGITUDE::Write( SENTENCE& sentence )
{
   CString temp_string;

   temp_string.Format( TEXT( "%08.2f" ), Longitude );

   sentence += temp_string;
   
   if ( Easting == East )
   {
      sentence += TEXT( "E" );
   }
   else if ( Easting == West )
   {
      sentence += TEXT( "W" );
   }
   else
   {
      /*
      ** Thanks to Jan-Erik Eriksson ([e-mail]) for
      ** finding and fixing a bug here
      */

      sentence += TEXT( "" );
   }
}

const LONGITUDE& LONGITUDE::operator = ( const LONGITUDE& source )
{
   Longitude = source.Longitude;
   Easting   = source.Easting;

   return( *this );
}