| 1 | #include "nmea0183.h"
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| 2 | #pragma hdrstop
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| 3 |
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| 4 | /*
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| 5 | ** Author: Samuel R. Blackburn
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| 6 | ** Internet: sam_blackburn@pobox.com
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| 7 | **
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| 8 | ** You can use it any way you like as long as you don't try to sell it.
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| 9 | **
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| 10 | ** Copyright, 1996, Samuel R. Blackburn
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| 11 | **
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| 12 | ** $Workfile: vtg.cpp $
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| 13 | ** $Revision: 4 $
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| 14 | ** $Modtime: 10/10/98 2:39p $
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| 15 | */
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| 16 |
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| 17 |
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| 18 |
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| 19 | VTG::VTG()
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| 20 | {
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| 21 | Mnemonic = "VTG";
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| 22 | Empty();
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| 23 | }
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| 24 |
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| 25 | VTG::~VTG()
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| 26 | {
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| 27 | //Mnemonic.Empty();
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| 28 | Empty();
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| 29 | }
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| 30 |
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| 31 | void VTG::Empty( void )
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| 32 | {
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| 33 | TrackDegreesTrue = 0.0;
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| 34 | TrackDegreesMagnetic = 0.0;
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| 35 | SpeedKnots = 0.0;
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| 36 | SpeedKilometersPerHour = 0.0;
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| 37 | }
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| 38 |
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| 39 | BOOL VTG::Parse( const SENTENCE& sentence )
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| 40 | {
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| 41 | /*
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| 42 | ** VTG - Track made good and Ground speed
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| 43 | **
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| 44 | ** 1 2 3 4 5 6 7 8 9
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| 45 | ** | | | | | | | | |
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| 46 | ** $--VTG,x.x,T,x.x,M,x.x,N,x.x,K*hh<CR><LF>
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| 47 | **
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| 48 | ** Field Number:
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| 49 | ** 1) Track Degrees
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| 50 | ** 2) T = True
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| 51 | ** 3) Track Degrees
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| 52 | ** 4) M = Magnetic
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| 53 | ** 5) Speed Knots
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| 54 | ** 6) N = Knots
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| 55 | ** 7) Speed Kilometers Per Hour
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| 56 | ** 8) K = Kilometers Per Hour
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| 57 | ** 9) Checksum
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| 58 | */
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| 59 |
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| 60 | /*
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| 61 | ** First we check the checksum...
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| 62 | ** the param '0' force automatic searching of checksum after '*' delimiter
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| 63 | */
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| 64 |
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| 65 | if ( sentence.IsChecksumBad( 0 ) == True )
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| 66 | {
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| 67 | SetErrorMessage( "Invalid Checksum" );
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| 68 | return( FALSE );
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| 69 | }
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| 70 |
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| 71 | TrackDegreesTrue = sentence.Double( 1 );
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| 72 | TrackDegreesMagnetic = sentence.Double( 3 );
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| 73 | SpeedKnots = sentence.Double( 5 );
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| 74 | SpeedKilometersPerHour = sentence.Double( 7 );
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| 75 |
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| 76 | return( TRUE );
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| 77 | }
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| 78 |
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| 79 | BOOL VTG::Write( SENTENCE& sentence )
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| 80 | {
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| 81 | /*
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| 82 | ** Let the parent do its thing
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| 83 | */
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| 84 |
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| 85 | RESPONSE::Write( sentence );
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| 86 |
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| 87 | sentence += TrackDegreesTrue;
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| 88 | sentence += "T";
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| 89 | sentence += TrackDegreesMagnetic;
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| 90 | sentence += "M";
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| 91 | sentence += SpeedKnots;
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| 92 | sentence += "N";
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| 93 | sentence += SpeedKilometersPerHour;
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| 94 | sentence += "K";
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| 95 |
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| 96 | sentence.Finish();
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| 97 |
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| 98 | return( TRUE );
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| 99 | }
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| 100 |
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| 101 | const VTG& VTG::operator = ( const VTG& source )
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| 102 | {
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| 103 | TrackDegreesTrue = source.TrackDegreesTrue;
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| 104 | TrackDegreesMagnetic = source.TrackDegreesMagnetic;
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| 105 | SpeedKnots = source.SpeedKnots;
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| 106 | SpeedKilometersPerHour = source.SpeedKilometersPerHour;
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| 107 |
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| 108 | return( *this );
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| 109 | }
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