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Added Tony's function to set position on a glide slope.

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This commit is contained in:
curt 2002-02-20 16:56:44 +00:00
parent 2f00a7970c
commit 1ea557f249
2 changed files with 31 additions and 0 deletions

27
src/Main/fg_init.cxx
View file

@ -467,6 +467,33 @@ bool fgSetPosFromAirportIDandHdg( const string& id, double tgt_hdg ) {
return true;
}
void fgSetPosFromGlideSlope(void) {
double gs = fgGetDouble("/velocities/glideslope");
double od = fgGetDouble("/sim/startup/offset-distance");
double alt = fgGetDouble("/position/altitude-ft");
//if glideslope and offset-distance are set and altitude is
//not, calculate the initial altitude
if( fabs(gs) > 0.01 && fabs(od) > 0.1 && alt < -9990 ) {
od *= SG_NM_TO_METER * SG_METER_TO_FEET;
alt = fabs(od*tan(gs));
fgSetDouble("/position/altitude-ft",alt);
fgSetBool("/sim/startup/onground", false);
SG_LOG(SG_GENERAL,SG_INFO, "Calculated altitude as: " << alt << " ft");
} else if( fabs(gs) > 0.01 && alt > 0 && fabs(od) < 0.1) {
od = alt/tan(gs);
od *= -1*SG_FEET_TO_METER * SG_METER_TO_NM;
fgSetDouble("/sim/startup/offset-distance",od);
SG_LOG(SG_GENERAL,SG_INFO, "Calculated offset distance as: "
<< od << " nm");
} else if( fabs(gs) > 0.01 ) {
SG_LOG(SG_GENERAL,SG_ALERT, "Glideslope given but not altitude"
<< " or offset-distance. Resetting"
<< " glideslope to zero" );
fgSetDouble("/velocities/glideslope",0);
}
}
// General house keeping initializations
bool fgInitGeneral( void ) {

4
src/Main/fg_init.hxx
View file

@ -80,6 +80,10 @@ bool fgSetPosFromAirportID( const string& id );
// Set position and heading given an airport id and heading (degrees)
bool fgSetPosFromAirportIDandHdg( const string& id, double tgt_hdg );
//find altitude given glideslope and offset distance or offset distance
//given glideslope and altitude
void fgSetPosFromGlideSlope(void);
// Initialize various time dependent systems (lighting, sun position, etc.)
// returns a new instance of the SGTime class
SGTime *fgInitTime();