rot.cpp

This is a GPS communication source code to interrupt the NMEA code though serial port. Very good

#include "nmea0183.h"
#pragma hdrstop

/*
** Author: Samuel R. Blackburn
** Internet: [e-mail]
**
** You can use it any way you like as long as you don't try to sell it.
**
** Copyright, 1996, Samuel R. Blackburn
**
** $Workfile: rot.cpp $
** $Revision: 4 $
** $Modtime: 10/10/98 2:56p $
*/

#ifdef _DEBUG
#undef THIS_FILE
static char BASED_CODE THIS_FILE[] = __FILE__;
#endif

ROT::ROT()
{
   Mnemonic = "ROT";
   Empty();
}

ROT::~ROT()
{
   Mnemonic.Empty();
   Empty();
}

void ROT::Empty( void )
{
   RateOfTurn  = 0.0;
   IsDataValid = NMEA_Unknown;
}

BOOL ROT::Parse( const SENTENCE& sentence )
{
   /*
   ** ROT - Rate Of Turn
   **
   **        1   2 3
   **        |   | |
   ** $--ROT,x.x,A*hh<CR><LF>
   **
   ** Field Number: 
   **  1) Rate Of Turn, degrees per minute, "-" means bow turns to port
   **  2) Status, A means data is valid
   **  3) Checksum
   */

   /*
   ** First we check the checksum...
   */

   if ( sentence.IsChecksumBad( 3 ) == True )
   {
      SetErrorMessage( "Invalid Checksum" );
      return( FALSE );
   } 

   RateOfTurn  = sentence.Double( 1 );
   IsDataValid = sentence.Boolean( 2 );

   return( TRUE );
}

CString ROT::PlainEnglish( void ) const
{
   CString return_string;

   return_string = "The bow is turning to ";

   char temp_string[ 80 ];

   if ( RateOfTurn < 0 )
   {
      ::sprintf( temp_string, "Port at a rate of %4.1lf degrees per minute.", (double) (RateOfTurn * -1.0) );
   }
   else
   {
      ::sprintf( temp_string, "Starboard at a rate of %4.1lf degrees per minute.", RateOfTurn );
   }

   return_string += temp_string;

   if ( IsDataValid != True )
   {
      if ( IsDataValid == False )
      {
         return_string += " However, this data is not valid.";
      }
      else
      {
         return_string += " However, this data cannot be confirmed.";
      }
   }

   return( return_string );
}

BOOL ROT::Write( SENTENCE& sentence )
{
   /*
   ** Let the parent do its thing
   */
   
   RESPONSE::Write( sentence );

   sentence += RateOfTurn;
   sentence += IsDataValid;
   
   sentence.Finish();

   return( TRUE );
}

const ROT& ROT::operator = ( const ROT& source )
{
   RateOfTurn  = source.RateOfTurn;
   IsDataValid = source.IsDataValid;

   return( *this );
}