fly/flightgear
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David Culp:

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The AIBase code was updated to fix an uninitialized pointer, and the
AIBallistic code has an improved FDM.
This commit is contained in:
ehofman 2004-08-21 12:24:54 +00:00
parent 4d9a30addc
commit 72b201d96c
2 changed files with 18 additions and 21 deletions
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38
src/AIModel/AIBallistic.cxx
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@ -39,8 +39,6 @@ FGAIBallistic::~FGAIBallistic() {
bool FGAIBallistic::init() {
FGAIBase::init();
vs = sin( elevation * 0.017453293 ) * speed;
hs = cos( elevation * 0.017453293 ) * speed;
aero_stabilized = true;
hdg = azimuth;
pitch = elevation;
@ -48,11 +46,11 @@ bool FGAIBallistic::init() {
}
void FGAIBallistic::bind() {
FGAIBase::bind();
// FGAIBase::bind();
}
void FGAIBallistic::unbind() {
FGAIBase::unbind();
// FGAIBase::unbind();
}
void FGAIBallistic::update(double dt) {
@ -63,12 +61,12 @@ void FGAIBallistic::update(double dt) {
void FGAIBallistic::setAzimuth(double az) {
azimuth = az;
hdg = azimuth = az;
}
void FGAIBallistic::setElevation(double el) {
elevation = el;
pitch = elevation = el;
}
@ -84,17 +82,12 @@ void FGAIBallistic::Run(double dt) {
// the two drag calculations below assume sea-level density,
// mass of 0.03 slugs, drag coeff of 0.295, frontal area of 0.007 ft2
// adjust horizontal speed due to drag
hs -= 0.000082 * hs * hs * dt;
if ( hs < 0.0 ) hs = 0.0;
// adjust speed due to drag
speed -= 0.000082 * speed * speed * dt;
if ( speed < 0.0 ) speed = 0.0;
vs = sin( pitch * SG_DEGREES_TO_RADIANS ) * speed;
hs = cos( pitch * SG_DEGREES_TO_RADIANS ) * speed;
// adjust vertical speed due to drag
if (vs > 0.0) {
vs -= 0.000082 * vs * vs * dt;
} else {
vs += 0.000082 * vs * vs * dt;
}
// convert horizontal speed (fps) to degrees per second
speed_north_deg_sec = cos(hdg / SG_RADIANS_TO_DEGREES) * hs / ft_per_deg_lat;
speed_east_deg_sec = sin(hdg / SG_RADIANS_TO_DEGREES) * hs / ft_per_deg_lon;
@ -103,16 +96,19 @@ void FGAIBallistic::Run(double dt) {
pos.setlat( pos.lat() + speed_north_deg_sec * dt);
pos.setlon( pos.lon() + speed_east_deg_sec * dt);
// adjust altitude (feet)
altitude += vs * dt;
pos.setelev(altitude * SG_FEET_TO_METER);
// adjust vertical speed for acceleration of gravity
vs -= 32.17 * dt;
// adjust altitude (meters)
altitude += vs * dt * SG_FEET_TO_METER;
pos.setelev(altitude);
// adjust pitch if aerostabilized
// recalculate pitch (velocity vector) if aerostabilized
if (aero_stabilized) pitch = atan2( vs, hs ) * SG_RADIANS_TO_DEGREES;
// recalculate total speed
speed = sqrt( vs * vs + hs * hs);
// set destruction flag if altitude less than sea level -1000
if (altitude < -1000.0) setDie(true);

1
src/AIModel/AIBase.cxx
View file

@ -55,6 +55,7 @@ FGAIBase::FGAIBase() {
model = 0;
_otype = otNull;
index = 0;
fp = (FGAIFlightPlan*)0;
}
FGAIBase::~FGAIBase() {