_type_str = "ship";
_otype = otShip;
- hdg_lock = false;
- rudder = 0.0;
}
FGAIShip::~FGAIShip() {
bool FGAIShip::init() {
+
+ hdg_lock = false;
+ rudder = 0.0;
+ no_roll = false;
+
+ rudder_constant = 0.5;
+ roll_constant = 0.001;
+ speed_constant = 0.05;
+ hdg_constant = 0.01;
+
return FGAIBase::init();
}
void FGAIShip::bind() {
FGAIBase::bind();
- props->tie("surface-positions/rudder-pos-norm",
- SGRawValuePointer<double>(&rudder));
+ props->tie("surface-positions/rudder-pos-deg",
+ SGRawValuePointer<float>(&rudder));
+ props->tie("controls/heading-lock",
+ SGRawValuePointer<bool>(&hdg_lock));
+ props->tie("controls/tgt-speed-kts",
+ SGRawValuePointer<double>(&tgt_speed));
+ props->tie("controls/tgt-heading-degs",
+ SGRawValuePointer<double>(&tgt_heading));
+ props->tie("controls/constants/rudder",
+ SGRawValuePointer<double>(&rudder_constant));
+ props->tie("controls/constants/roll",
+ SGRawValuePointer<double>(&roll_constant));
+ props->tie("controls/constants/rudder",
+ SGRawValuePointer<double>(&rudder_constant));
+ props->tie("controls/constants/speed",
+ SGRawValuePointer<double>(&speed_constant));
+
+ props->setStringValue("name", name.c_str());
}
void FGAIShip::unbind() {
FGAIBase::unbind();
+ props->untie("surface-positions/rudder-pos-deg");
+ props->untie("controls/heading-lock");
+ props->untie("controls/tgt-speed-kts");
+ props->untie("controls/tgt-heading-degs");
+ props->untie("controls/constants/roll");
+ props->untie("controls/constants/rudder");
+ props->untie("controls/constants/speed");
+
}
void FGAIShip::update(double dt) {
if (fp) ProcessFlightPlan(dt);
- double turn_radius_ft;
- double turn_circum_ft;
+ double sp_turn_radius_ft;
+ double rd_turn_radius_ft;
double speed_north_deg_sec;
double speed_east_deg_sec;
double dist_covered_ft;
double alpha;
+ double rudder_limit;
+ double raw_roll;
// adjust speed
double speed_diff = tgt_speed - speed;
if (fabs(speed_diff) > 0.1) {
- if (speed_diff > 0.0) speed += 0.1 * dt;
- if (speed_diff < 0.0) speed -= 0.1 * dt;
+ if (speed_diff > 0.0) speed += speed_constant * dt;
+ if (speed_diff < 0.0) speed -= speed_constant * dt;
}
// convert speed to degrees per second
- speed_north_deg_sec = cos( hdg / SG_RADIANS_TO_DEGREES )
+ speed_north_deg_sec = cos( hdg / SGD_RADIANS_TO_DEGREES )
* speed * 1.686 / ft_per_deg_lat;
- speed_east_deg_sec = sin( hdg / SG_RADIANS_TO_DEGREES )
+ speed_east_deg_sec = sin( hdg / SGD_RADIANS_TO_DEGREES )
* speed * 1.686 / ft_per_deg_lon;
// set new position
pos.setlat( pos.lat() + speed_north_deg_sec * dt);
pos.setlon( pos.lon() + speed_east_deg_sec * dt);
+
// adjust heading based on current rudder angle
- if (rudder != 0.0) {
- turn_radius_ft = 0.088362 * speed * speed
+ if (rudder <= -0.25 || rudder >= 0.25) {
+ /* turn_radius_ft = 0.088362 * speed * speed
/ tan( fabs(rudder) / SG_RADIANS_TO_DEGREES );
turn_circum_ft = SGD_2PI * turn_radius_ft;
dist_covered_ft = speed * 1.686 * dt;
- alpha = dist_covered_ft / turn_circum_ft * 360.0;
+ alpha = dist_covered_ft / turn_circum_ft * 360.0;*/
+
+ if (turn_radius_ft <= 0) turn_radius_ft = 0; // don't allow nonsense values
+ if (rudder > 45) rudder = 45;
+ if (rudder < -45) rudder = -45;
+
+// adjust turn radius for speed. The equation is very approximate.
+ sp_turn_radius_ft = 10 * pow ((speed - 15),2) + turn_radius_ft;
+// cout << " speed turn radius " << sp_turn_radius_ft ;
+
+// adjust turn radius for rudder angle. The equation is even more approximate.
+ float a = 19;
+ float b = -0.2485;
+ float c = 0.543;
+
+ rd_turn_radius_ft = (a * exp(b * fabs(rudder)) + c) * sp_turn_radius_ft;
+
+// cout <<" rudder turn radius " << rd_turn_radius_ft << endl;
+
+// calculate the angle, alpha, subtended by the arc traversed in time dt
+ alpha = ((speed * 1.686 * dt)/rd_turn_radius_ft) * SG_RADIANS_TO_DEGREES;
+
+
+// make sure that alpha is applied in the right direction
hdg += alpha * sign( rudder );
if ( hdg > 360.0 ) hdg -= 360.0;
if ( hdg < 0.0) hdg += 360.0;
+
+//adjust roll for rudder angle and speed. Another bit of voodoo
+ raw_roll = -0.0166667 * speed * rudder;
}
+ else
+ {
+// rudder angle is 0
+ raw_roll = 0;
+// cout << " roll "<< roll << endl;
+ }
+
+ //low pass filter
+ roll = (raw_roll * roll_constant) + (roll * (1 - roll_constant));
+
+ /*cout << " rudder: " << rudder << " raw roll: "<< raw_roll<<" roll: " << roll ;
+ cout << " hdg: " << hdg << endl ;*/
// adjust target rudder angle if heading lock engaged
if (hdg_lock) {
} else {
rudder_sense = -1.0;
}
- if (diff < 30) tgt_roll = diff * rudder_sense;
+ if (diff < 15){
+ tgt_rudder = diff * rudder_sense;
+ }
+ else
+ {
+ tgt_rudder = 45 * rudder_sense;
+ }
}
// adjust rudder angle
- double rudder_diff = tgt_roll - rudder;
- if (fabs(rudder_diff) > 0.1) {
- if (rudder_diff > 0.0) rudder += 5.0 * dt;
- if (rudder_diff < 0.0) rudder -= 5.0 * dt;
+ double rudder_diff = tgt_rudder - rudder;
+ // set the rudder limit by speed
+ if (speed <= 40 ){
+ rudder_limit = (-0.825 * speed) + 35;
+ }else{
+ rudder_limit = 2;
}
+ if (fabs(rudder_diff) > 0.1) {
+ if (rudder_diff > 0.0){
+ rudder += rudder_constant * dt;
+ if (rudder > rudder_limit) rudder = rudder_limit;// apply the rudder limit
+ } else if (rudder_diff < 0.0){
+ rudder -= rudder_constant * dt;
+ if (rudder < -rudder_limit) rudder = -rudder_limit;
+ }
}
+
+}//end function
+
+
void FGAIShip::AccelTo(double speed) {
tgt_speed = speed;
}
-
void FGAIShip::PitchTo(double angle) {
tgt_pitch = angle;
}
fp = f;
}
+void FGAIShip::setName(const string& n) {
+ name = n;
+}
+
void FGAIShip::ProcessFlightPlan(double dt) {
// not implemented yet
}
+void FGAIShip::setRudder(float r) {
+ rudder = r;
+}
+
+void FGAIShip::setRoll(double rl) {
+ roll = rl;
+}
projects / flightgear.git / blobdiff