1 // FGAICarrier - FGAIShip-derived class creates an AI aircraft carrier
3 // Written by David Culp, started October 2004.
4 // - davidculp2@comcast.net
6 // This program is free software; you can redistribute it and/or
7 // modify it under the terms of the GNU General Public License as
8 // published by the Free Software Foundation; either version 2 of the
9 // License, or (at your option) any later version.
11 // This program is distributed in the hope that it will be useful, but
12 // WITHOUT ANY WARRANTY; without even the implied warranty of
13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 // General Public License for more details.
16 // You should have received a copy of the GNU General Public License
17 // along with this program; if not, write to the Free Software
18 // Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
27 #include <simgear/math/point3d.hxx>
28 #include <simgear/math/sg_geodesy.hxx>
30 #include <Main/util.hxx>
31 #include <Main/viewer.hxx>
33 #include "AICarrier.hxx"
35 #include "AIScenario.hxx"
37 /** Value of earth radius (meters) */
38 #define RADIUS_M SG_EQUATORIAL_RADIUS_M
42 FGAICarrier::FGAICarrier(FGAIManager* mgr) : FGAIShip(mgr) {
43 _type_str = "carrier";
49 FGAICarrier::~FGAICarrier() {
52 void FGAICarrier::setWind_from_east(double fps) {
56 void FGAICarrier::setWind_from_north(double fps) {
57 wind_from_north = fps;
60 void FGAICarrier::setMaxLat(double deg) {
64 void FGAICarrier::setMinLat(double deg) {
68 void FGAICarrier::setMaxLong(double deg) {
72 void FGAICarrier::setMinLong(double deg) {
76 void FGAICarrier::setSolidObjects(const list<string>& so) {
80 void FGAICarrier::setWireObjects(const list<string>& wo) {
84 void FGAICarrier::setCatapultObjects(const list<string>& co) {
85 catapult_objects = co;
88 void FGAICarrier::setParkingPositions(const list<ParkPosition>& p) {
92 void FGAICarrier::setSign(const string& s) {
96 void FGAICarrier::setTACANChannelID(const string& id) {
97 TACAN_channel_id = id;
100 void FGAICarrier::setFlolsOffset(const Point3D& off) {
104 void FGAICarrier::getVelocityWrtEarth(sgdVec3& v, sgdVec3& omega, sgdVec3& pivot) {
105 sgdCopyVec3(v, vel_wrt_earth );
106 sgdCopyVec3(omega, rot_wrt_earth );
107 sgdCopyVec3(pivot, rot_pivot_wrt_earth );
110 void FGAICarrier::update(double dt) {
112 // For computation of rotation speeds we just use finite differences her.
113 // That is perfectly valid since this thing is not driven by accelerations
114 // but by just apply discrete changes at its velocity variables.
115 double old_hdg = hdg;
116 double old_roll = roll;
117 double old_pitch = pitch;
119 // Update the velocity information stored in those nodes.
120 double v_north = 0.51444444*speed*cos(hdg * SGD_DEGREES_TO_RADIANS);
121 double v_east = 0.51444444*speed*sin(hdg * SGD_DEGREES_TO_RADIANS);
123 double sin_lat = sin(pos.lat() * SGD_DEGREES_TO_RADIANS);
124 double cos_lat = cos(pos.lat() * SGD_DEGREES_TO_RADIANS);
125 double sin_lon = sin(pos.lon() * SGD_DEGREES_TO_RADIANS);
126 double cos_lon = cos(pos.lon() * SGD_DEGREES_TO_RADIANS);
127 double sin_roll = sin(roll * SGD_DEGREES_TO_RADIANS);
128 double cos_roll = cos(roll * SGD_DEGREES_TO_RADIANS);
129 double sin_pitch = sin(pitch * SGD_DEGREES_TO_RADIANS);
130 double cos_pitch = cos(pitch * SGD_DEGREES_TO_RADIANS);
131 double sin_hdg = sin(hdg * SGD_DEGREES_TO_RADIANS);
132 double cos_hdg = cos(hdg * SGD_DEGREES_TO_RADIANS);
134 // Transform this back the the horizontal local frame.
137 // set up the transform matrix
138 trans[0][0] = cos_pitch*cos_hdg;
139 trans[0][1] = sin_roll*sin_pitch*cos_hdg - cos_roll*sin_hdg;
140 trans[0][2] = cos_roll*sin_pitch*cos_hdg + sin_roll*sin_hdg;
142 trans[1][0] = cos_pitch*sin_hdg;
143 trans[1][1] = sin_roll*sin_pitch*sin_hdg + cos_roll*cos_hdg;
144 trans[1][2] = cos_roll*sin_pitch*sin_hdg - sin_roll*cos_hdg;
146 trans[2][0] = -sin_pitch;
147 trans[2][1] = sin_roll*cos_pitch;
148 trans[2][2] = cos_roll*cos_pitch;
150 sgdSetVec3( vel_wrt_earth,
151 - cos_lon*sin_lat*v_north - sin_lon*v_east,
152 - sin_lon*sin_lat*v_north + cos_lon*v_east,
154 sgGeodToCart(pos.lat() * SGD_DEGREES_TO_RADIANS,
155 pos.lon() * SGD_DEGREES_TO_RADIANS,
156 pos.elev(), rot_pivot_wrt_earth);
158 // Now update the position and heading. This will compute new hdg and
159 // roll values required for the rotation speed computation.
160 FGAIShip::update(dt);
163 //automatic turn into wind with a target wind of 25 kts otd
164 if(turn_to_launch_hdg){
166 } else if(OutsideBox() || returning) {// check that the carrier is inside the operating box
168 } else { //if(!returning
172 // Only change these values if we are able to compute them safely
174 sgdSetVec3( rot_wrt_earth, 0.0, 0.0, 0.0);
176 // Compute the change of the euler angles.
177 double hdg_dot = SGD_DEGREES_TO_RADIANS * (hdg-old_hdg)/dt;
178 // Allways assume that the movement was done by the shorter way.
179 if (hdg_dot < - SGD_DEGREES_TO_RADIANS * 180)
180 hdg_dot += SGD_DEGREES_TO_RADIANS * 360;
181 if (hdg_dot > SGD_DEGREES_TO_RADIANS * 180)
182 hdg_dot -= SGD_DEGREES_TO_RADIANS * 360;
183 double pitch_dot = SGD_DEGREES_TO_RADIANS * (pitch-old_pitch)/dt;
184 // Allways assume that the movement was done by the shorter way.
185 if (pitch_dot < - SGD_DEGREES_TO_RADIANS * 180)
186 pitch_dot += SGD_DEGREES_TO_RADIANS * 360;
187 if (pitch_dot > SGD_DEGREES_TO_RADIANS * 180)
188 pitch_dot -= SGD_DEGREES_TO_RADIANS * 360;
189 double roll_dot = SGD_DEGREES_TO_RADIANS * (roll-old_roll)/dt;
190 // Allways assume that the movement was done by the shorter way.
191 if (roll_dot < - SGD_DEGREES_TO_RADIANS * 180)
192 roll_dot += SGD_DEGREES_TO_RADIANS * 360;
193 if (roll_dot > SGD_DEGREES_TO_RADIANS * 180)
194 roll_dot -= SGD_DEGREES_TO_RADIANS * 360;
195 /*cout << "euler derivatives = "
196 << roll_dot << " " << pitch_dot << " " << hdg_dot << endl;*/
198 // Now Compute the rotation vector in the carriers coordinate frame
199 // originating from the euler angle changes.
201 body[0] = roll_dot - hdg_dot*sin_pitch;
202 body[1] = pitch_dot*cos_roll + hdg_dot*sin_roll*cos_pitch;
203 body[2] = -pitch_dot*sin_roll + hdg_dot*cos_roll*cos_pitch;
205 // Transform that back to the horizontal local frame.
207 hl[0] = body[0]*trans[0][0] + body[1]*trans[0][1] + body[2]*trans[0][2];
208 hl[1] = body[0]*trans[1][0] + body[1]*trans[1][1] + body[2]*trans[1][2];
209 hl[2] = body[0]*trans[2][0] + body[1]*trans[2][1] + body[2]*trans[2][2];
211 // Now we need to project out rotation components ending in speeds in y
212 // direction in the hoirizontal local frame.
215 // Transform that to the earth centered frame.
216 sgdSetVec3(rot_wrt_earth,
217 - cos_lon*sin_lat*hl[0] - sin_lon*hl[1] - cos_lat*cos_lon*hl[2],
218 - sin_lon*sin_lat*hl[0] + cos_lon*hl[1] - cos_lat*sin_lon*hl[2],
219 cos_lat*hl[0] - sin_lat*hl[2]);
227 bool FGAICarrier::init() {
228 if (!FGAIShip::init())
231 // process the 3d model here
232 // mark some objects solid, mark the wires ...
234 // The model should be used for altitude computations.
235 // To avoid that every detail in a carrier 3D model will end into
236 // the aircraft local cache, only set the HOT traversal bit on
238 ssgEntity *sel = aip.getSceneGraph();
239 // Clear the HOT traversal flag
241 // Selectively set that flag again for wires/cats/solid objects.
242 // Attach a pointer to this carrier class to those objects.
243 mark_wires(sel, wire_objects);
244 mark_cat(sel, catapult_objects);
245 mark_solid(sel, solid_objects);
247 _longitude_node = fgGetNode("/position/longitude-deg", true);
248 _latitude_node = fgGetNode("/position/latitude-deg", true);
249 _altitude_node = fgGetNode("/position/altitude-ft", true);
250 _dme_freq_node = fgGetNode("/instrumentation/dme/frequencies/selected-mhz", true);
251 _surface_wind_from_deg_node =
252 fgGetNode("/environment/config/boundary/entry[0]/wind-from-heading-deg", true);
253 _surface_wind_speed_node =
254 fgGetNode("/environment/config/boundary/entry[0]/wind-speed-kt", true);
257 turn_to_launch_hdg = false;
267 void FGAICarrier::bind() {
270 props->untie("velocities/true-airspeed-kt");
272 props->tie("controls/flols/source-lights",
273 SGRawValuePointer<int>(&source));
274 props->tie("controls/flols/distance-m",
275 SGRawValuePointer<double>(&dist));
276 props->tie("controls/flols/angle-degs",
277 SGRawValuePointer<double>(&angle));
278 props->tie("controls/turn-to-launch-hdg",
279 SGRawValuePointer<bool>(&turn_to_launch_hdg));
280 props->tie("controls/in-to-wind",
281 SGRawValuePointer<bool>(&turn_to_launch_hdg));
282 props->tie("controls/base-course-deg",
283 SGRawValuePointer<double>(&base_course));
284 props->tie("controls/base-speed-kts",
285 SGRawValuePointer<double>(&base_speed));
286 props->tie("controls/start-pos-lat-deg",
287 SGRawValuePointer<double>(&initialpos[1]));
288 props->tie("controls/start-pos-long-deg",
289 SGRawValuePointer<double>(&initialpos[0]));
290 props->tie("velocities/speed-kts",
291 SGRawValuePointer<double>(&speed));
292 props->tie("environment/surface-wind-speed-true-kts",
293 SGRawValuePointer<double>(&wind_speed_kts));
294 props->tie("environment/surface-wind-from-true-degs",
295 SGRawValuePointer<double>(&wind_from_deg));
296 props->tie("environment/rel-wind-from-degs",
297 SGRawValuePointer<double>(&rel_wind_from_deg));
298 props->tie("environment/rel-wind-from-carrier-hdg-degs",
299 SGRawValuePointer<double>(&rel_wind));
300 props->tie("environment/rel-wind-speed-kts",
301 SGRawValuePointer<double>(&rel_wind_speed_kts));
302 props->tie("controls/flols/wave-off-lights",
303 SGRawValuePointer<bool>(&wave_off_lights));
305 props->setBoolValue("controls/flols/cut-lights", false);
306 props->setBoolValue("controls/flols/wave-off-lights", false);
307 props->setBoolValue("controls/flols/cond-datum-lights", true);
308 props->setBoolValue("controls/crew", false);
310 props->setStringValue("navaids/tacan/channel-ID", TACAN_channel_id.c_str());
311 props->setStringValue("sign", sign.c_str());
314 void FGAICarrier::unbind() {
317 props->untie("velocities/true-airspeed-kt");
319 props->untie("controls/flols/source-lights");
320 props->untie("controls/flols/distance-m");
321 props->untie("controls/flols/angle-degs");
322 props->untie("controls/turn-to-launch-hdg");
323 props->untie("velocities/speed-kts");
324 props->untie("environment/wind-speed-true-kts");
325 props->untie("environment/wind-from-true-degs");
326 props->untie("environment/rel-wind-from-degs");
327 props->untie("environment/rel-wind-speed-kts");
328 props->untie("controls/flols/wave-off-lights");
332 bool FGAICarrier::getParkPosition(const string& id, Point3D& geodPos,
333 double& hdng, sgdVec3 uvw)
336 // FIXME: does not yet cover rotation speeds.
337 list<ParkPosition>::iterator it = ppositions.begin();
338 while (it != ppositions.end()) {
339 // Take either the specified one or the first one ...
340 if ((*it).name == id || id.empty()) {
341 ParkPosition ppos = *it;
342 geodPos = getGeocPosAt(ppos.offset);
343 hdng = hdg + ppos.heading_deg;
344 double shdng = sin(ppos.heading_deg * SGD_DEGREES_TO_RADIANS);
345 double chdng = cos(ppos.heading_deg * SGD_DEGREES_TO_RADIANS);
346 double speed_fps = speed*1.6878099;
347 sgdSetVec3(uvw, chdng*speed_fps, shdng*speed_fps, 0);
356 void FGAICarrier::mark_nohot(ssgEntity* e) {
357 if (e->isAKindOf(ssgTypeBranch())) {
358 ssgBranch* br = (ssgBranch*)e;
360 for ( kid = br->getKid(0); kid != NULL ; kid = br->getNextKid() )
363 br->clrTraversalMaskBits(SSGTRAV_HOT);
365 } else if (e->isAKindOf(ssgTypeLeaf())) {
367 e->clrTraversalMaskBits(SSGTRAV_HOT);
372 bool FGAICarrier::mark_wires(ssgEntity* e, const list<string>& wire_objects, bool mark) {
374 if (e->isAKindOf(ssgTypeBranch())) {
375 ssgBranch* br = (ssgBranch*)e;
378 list<string>::const_iterator it;
379 for (it = wire_objects.begin(); it != wire_objects.end(); ++it)
380 mark = mark || (e->getName() && (*it) == e->getName());
382 for ( kid = br->getKid(0); kid != NULL ; kid = br->getNextKid() )
383 found = mark_wires(kid, wire_objects, mark) || found;
386 br->setTraversalMaskBits(SSGTRAV_HOT);
388 } else if (e->isAKindOf(ssgTypeLeaf())) {
389 list<string>::const_iterator it;
390 for (it = wire_objects.begin(); it != wire_objects.end(); ++it) {
391 if (mark || (e->getName() && (*it) == e->getName())) {
392 e->setTraversalMaskBits(SSGTRAV_HOT);
393 ssgBase* ud = e->getUserData();
395 FGAICarrierHardware* ch = dynamic_cast<FGAICarrierHardware*>(ud);
397 SG_LOG(SG_GENERAL, SG_WARN,
398 "AICarrier: Carrier hardware gets marked twice!\n"
399 " You have propably a whole branch marked as"
400 " a wire which also includes other carrier hardware."
403 SG_LOG(SG_GENERAL, SG_ALERT,
404 "AICarrier: Found user data attached to a leaf node which "
405 "should be marked as a wire!\n ****Skipping!****");
408 e->setUserData( FGAICarrierHardware::newWire( this ) );
409 ssgLeaf *l = (ssgLeaf*)e;
410 if ( l->getNumLines() != 1 ) {
411 SG_LOG(SG_GENERAL, SG_ALERT,
412 "AICarrier: Found wires not modelled with exactly one line!");
422 bool FGAICarrier::mark_solid(ssgEntity* e, const list<string>& solid_objects, bool mark) {
424 if (e->isAKindOf(ssgTypeBranch())) {
425 ssgBranch* br = (ssgBranch*)e;
428 list<string>::const_iterator it;
429 for (it = solid_objects.begin(); it != solid_objects.end(); ++it)
430 mark = mark || (e->getName() && (*it) == e->getName());
432 for ( kid = br->getKid(0); kid != NULL ; kid = br->getNextKid() )
433 found = mark_solid(kid, solid_objects, mark) || found;
436 br->setTraversalMaskBits(SSGTRAV_HOT);
438 } else if (e->isAKindOf(ssgTypeLeaf())) {
439 list<string>::const_iterator it;
440 for (it = solid_objects.begin(); it != solid_objects.end(); ++it) {
441 if (mark || (e->getName() && (*it) == e->getName())) {
442 e->setTraversalMaskBits(SSGTRAV_HOT);
443 ssgBase* ud = e->getUserData();
445 FGAICarrierHardware* ch = dynamic_cast<FGAICarrierHardware*>(ud);
447 SG_LOG(SG_GENERAL, SG_WARN,
448 "AICarrier: Carrier hardware gets marked twice!\n"
449 " You have propably a whole branch marked solid"
450 " which also includes other carrier hardware."
453 SG_LOG(SG_GENERAL, SG_ALERT,
454 "AICarrier: Found user data attached to a leaf node which "
455 "should be marked solid!\n ****Skipping!****");
458 e->setUserData( FGAICarrierHardware::newSolid( this ) );
467 bool FGAICarrier::mark_cat(ssgEntity* e, const list<string>& cat_objects, bool mark) {
469 if (e->isAKindOf(ssgTypeBranch())) {
470 ssgBranch* br = (ssgBranch*)e;
473 list<string>::const_iterator it;
474 for (it = cat_objects.begin(); it != cat_objects.end(); ++it)
475 mark = mark || (e->getName() && (*it) == e->getName());
477 for ( kid = br->getKid(0); kid != NULL ; kid = br->getNextKid() )
478 found = mark_cat(kid, cat_objects, mark) || found;
481 br->setTraversalMaskBits(SSGTRAV_HOT);
483 } else if (e->isAKindOf(ssgTypeLeaf())) {
484 list<string>::const_iterator it;
485 for (it = cat_objects.begin(); it != cat_objects.end(); ++it) {
486 if (mark || (e->getName() && (*it) == e->getName())) {
487 e->setTraversalMaskBits(SSGTRAV_HOT);
488 ssgBase* ud = e->getUserData();
490 FGAICarrierHardware* ch = dynamic_cast<FGAICarrierHardware*>(ud);
492 SG_LOG(SG_GENERAL, SG_WARN,
493 "AICarrier: Carrier hardware gets marked twice!\n"
494 "You have probably a whole branch marked as"
495 "a catapult which also includes other carrier hardware."
498 SG_LOG(SG_GENERAL, SG_ALERT,
499 "AICarrier: Found user data attached to a leaf node which "
500 "should be marked as a catapult!\n ****Skipping!****");
503 e->setUserData( FGAICarrierHardware::newCatapult( this ) );
504 ssgLeaf *l = (ssgLeaf*)e;
505 if ( l->getNumLines() != 1 ) {
506 SG_LOG(SG_GENERAL, SG_ALERT,
507 "AICarrier: Found a cat not modelled with exactly "
510 // Now some special code to make sure the cat points in the right
511 // direction. The 0 index must be the backward end, the 1 index
513 // Forward is positive x-direction in our 3D model, also the model
514 // as such is flattened when it is loaded, so we do not need to
515 // care for transforms ...
517 l->getLine(0, v, v+1 );
519 for (int k=0; k<2; ++k)
520 sgCopyVec3( ends[k], l->getVertex( v[k] ) );
522 // When the 1 end is behind the 0 end, swap the coordinates.
523 if (ends[0][0] < ends[1][0]) {
524 sgCopyVec3( l->getVertex( v[0] ), ends[1] );
525 sgCopyVec3( l->getVertex( v[1] ), ends[0] );
537 void FGAICarrier::UpdateFlols(const sgdMat3& trans) {
542 double flolsXYZ[3], eyeXYZ[3];
543 double lat, lon, alt;
547 /* cout << "x_offset " << flols_x_offset
548 << " y_offset " << flols_y_offset
549 << " z_offset " << flols_z_offset << endl;
551 cout << "roll " << roll
552 << " heading " << hdg
553 << " pitch " << pitch << endl;
555 cout << "carrier lon " << pos[0]
557 << " alt " << pos[2] << endl;*/
559 // set the Flols intitial position to the carrier position
563 /* cout << "flols lon " << flolspos[0]
564 << " lat " << flolspos[1]
565 << " alt " << flolspos[2] << endl;*/
567 // set the offsets in metres
569 /* cout << "flols_x_offset " << flols_x_offset << endl
570 << "flols_y_offset " << flols_y_offset << endl
571 << "flols_z_offset " << flols_z_offset << endl;*/
573 in[0] = flols_off.x();
574 in[1] = flols_off.y();
575 in[2] = flols_off.z();
577 // multiply the input and transform matrices
579 out[0] = in[0] * trans[0][0] + in[1] * trans[0][1] + in[2] * trans[0][2];
580 out[1] = in[0] * trans[1][0] + in[1] * trans[1][1] + in[2] * trans[1][2];
581 out[2] = in[0] * trans[2][0] + in[1] * trans[2][1] + in[2] * trans[2][2];
583 // convert meters to ft to degrees of latitude
584 out[0] = (out[0] * 3.28083989501) /(366468.96 - 3717.12 * cos(flolspos[0] * SG_DEGREES_TO_RADIANS));
586 // convert meters to ft to degrees of longitude
587 out[1] = (out[1] * 3.28083989501)/(365228.16 * cos(flolspos[1] * SG_DEGREES_TO_RADIANS));
589 //print out the result
590 /* cout << "lat adjust deg" << out[0]
591 << " lon adjust deg " << out[1]
592 << " alt adjust m " << out[2] << endl;*/
594 // adjust Flols position
595 flolspos[0] += out[0];
596 flolspos[1] += out[1];
597 flolspos[2] += out[2];
599 // convert flols position to cartesian co-ordinates
601 sgGeodToCart(flolspos[1] * SG_DEGREES_TO_RADIANS,
602 flolspos[0] * SG_DEGREES_TO_RADIANS,
603 flolspos[2] , flolsXYZ );
606 /* cout << "flols X " << flolsXYZ[0]
607 << " Y " << flolsXYZ[1]
608 << " Z " << flolsXYZ[2] << endl;
610 // check the conversion
612 sgCartToGeod(flolsXYZ, &lat, &lon, &alt);
614 cout << "flols check lon " << lon
616 << " alt " << alt << endl; */
618 //get the current position of the pilot's eyepoint (cartesian cordinates)
620 sgdCopyVec3( eyeXYZ, globals->get_current_view()->get_absolute_view_pos() );
622 /* cout << "Eye_X " << eyeXYZ[0]
623 << " Eye_Y " << eyeXYZ[1]
624 << " Eye_Z " << eyeXYZ[2] << endl; */
626 sgCartToGeod(eyeXYZ, &lat, &lon, &alt);
628 eyepos[0] = lon * SG_RADIANS_TO_DEGREES;
629 eyepos[1] = lat * SG_RADIANS_TO_DEGREES;
632 /* cout << "eye lon " << eyepos[0]
633 << " eye lat " << eyepos[1]
634 << " eye alt " << eyepos[2] << endl; */
636 //calculate the ditance from eye to flols
638 dist = sgdDistanceVec3( flolsXYZ, eyeXYZ );
640 //apply an index error
644 //cout << "distance " << dist << endl;
647 // calculate height above FLOLS
648 double y = eyepos[2] - flolspos[2];
650 // calculate the angle from the flols to eye
651 // above the horizontal
655 angle = asin( y / dist );
660 angle *= SG_RADIANS_TO_DEGREES;
663 // cout << " height " << y << " angle " << angle ;
665 // set the value of source
667 if ( angle <= 4.35 && angle > 4.01 )
669 else if ( angle <= 4.01 && angle > 3.670 )
671 else if ( angle <= 3.670 && angle > 3.330 )
673 else if ( angle <= 3.330 && angle > 2.990 )
675 else if ( angle <= 2.990 && angle > 2.650 )
677 else if ( angle <= 2.650 )
682 // cout << " source " << source << endl;
687 // find relative wind
692 void FGAICarrier::UpdateWind( double dt) {
696 //calculate the reciprocal hdg
705 //cout <<" heading: " << hdg << "recip: " << recip << endl;
707 //get the surface wind speed and direction
708 wind_from_deg = _surface_wind_from_deg_node->getDoubleValue();
709 wind_speed_kts = _surface_wind_speed_node->getDoubleValue();
711 //calculate the surface wind speed north and east in kts
712 double wind_speed_from_north_kts = cos( wind_from_deg / SGD_RADIANS_TO_DEGREES )* wind_speed_kts ;
713 double wind_speed_from_east_kts = sin( wind_from_deg / SGD_RADIANS_TO_DEGREES )* wind_speed_kts ;
715 //calculate the carrier speed north and east in kts
716 double speed_north_kts = cos( hdg / SGD_RADIANS_TO_DEGREES )* speed ;
717 double speed_east_kts = sin( hdg / SGD_RADIANS_TO_DEGREES )* speed ;
719 //calculate the relative wind speed north and east in kts
720 double rel_wind_speed_from_east_kts = wind_speed_from_east_kts + speed_east_kts;
721 double rel_wind_speed_from_north_kts = wind_speed_from_north_kts + speed_north_kts;
723 //combine relative speeds north and east to get relative windspeed in kts
724 rel_wind_speed_kts = sqrt((rel_wind_speed_from_east_kts * rel_wind_speed_from_east_kts)
725 + (rel_wind_speed_from_north_kts * rel_wind_speed_from_north_kts));
727 //calculate the relative wind direction
728 rel_wind_from_deg = atan(rel_wind_speed_from_east_kts/rel_wind_speed_from_north_kts)
729 * SG_RADIANS_TO_DEGREES;
731 // rationalise the output
732 if (rel_wind_speed_from_north_kts <= 0){
733 rel_wind_from_deg = 180 + rel_wind_from_deg;
736 if(rel_wind_speed_from_east_kts <= 0){
737 rel_wind_from_deg = 360 + rel_wind_from_deg;
742 rel_wind = rel_wind_from_deg - hdg ;
743 if (rel_wind > 180) rel_wind -= 360;
745 //switch the wave-off lights
747 wave_off_lights = false;
749 wave_off_lights = true;
752 // cout << "rel wind: " << rel_wind << endl;
756 void FGAICarrier::TurnToLaunch(){
758 //calculate tgt speed
759 double tgt_speed = 25 - wind_speed_kts;
760 if (tgt_speed < 10) tgt_speed = 10;
763 FGAIShip::TurnTo(wind_from_deg);
764 FGAIShip::AccelTo(tgt_speed);
768 } // end turn to launch
770 void FGAICarrier::TurnToBase(){
773 FGAIShip::TurnTo(base_course);
774 FGAIShip::AccelTo(base_speed);
776 } // end turn to base
778 void FGAICarrier::ReturnToBox(){
779 double course, distance;
781 //get the carrier position
784 //cout << "lat: " << carrierpos[1] << " lon: " << carrierpos[0] << endl;
786 //calculate the bearing and range of the initial position from the carrier
787 geo_inverse_wgs_84(carrierpos[2],
792 &course, &az2, &distance);
794 distance *= SG_METER_TO_NM;
796 //cout << "return course: " << course << " distance: " << distance << endl;
798 FGAIShip::TurnTo(course);
799 FGAIShip::AccelTo(base_speed);
806 } // end turn to base
809 void FGAICarrier::UpdateTACAN(double dt){ //update the TACAN
811 //cout << "TACAN: " << TACAN_channel_id << endl;
813 double max_range_nm = 100; //nm
815 double dme_freq = _dme_freq_node->getDoubleValue();
817 //cout << "dme_freq: " << dme_freq << endl;
819 if (TACAN_channel_id == "017X"){
821 //get the aircraft position
822 double longitude_deg = _longitude_node->getDoubleValue();
823 double latitude_deg = _latitude_node->getDoubleValue();
824 double altitude_m = _altitude_node->getDoubleValue() * SG_FEET_TO_METER;
826 //get the carrier position
829 //cout << "lat: " << carrierpos[1] << " lon: " << carrierpos[0] << endl;
831 //calculate the bearing and range of the carrier from the aircraft
832 geo_inverse_wgs_84(altitude_m,
837 &bearing, &az2, &range);
839 range *= SG_METER_TO_NM;
843 double aircraft_horizon_nm = Horizon(altitude_m) * SG_METER_TO_NM;
844 double carrier_horizon_nm = Horizon(50) * SG_METER_TO_NM;
845 double horizon_nm = aircraft_horizon_nm + carrier_horizon_nm;
847 if (range > horizon_nm || range > max_range_nm) {
851 /*cout << "bearing: " << bearing << " range: " << range << " altitude: " << altitude_m
852 << " horizon: " << horizon_nm << endl; */
860 bool FGAICarrier::OutsideBox(){ //returns true if the carrier is outside operating box
862 if ( max_lat == 0 && min_lat == 0 && max_long == 0 && min_long == 0) {
863 SG_LOG(SG_GENERAL, SG_BULK,"AICarrier: No Operating Box defined" );
867 if (initialpos[1] >= 0){//northern hemisphere
868 if (pos[1] >= initialpos[1] + max_lat) {return true;}
869 else if (pos[1] <= initialpos[1] - min_lat) {return true;}
870 }else{ //southern hemisphere
871 if (pos[1] <= initialpos[1] - max_lat) {return true;}
872 else if (pos[1] >= initialpos[1] + min_lat) {return true;}
875 if (initialpos[0] >=0) {//eastern hemisphere
876 if (pos[0] >= initialpos[0] + max_long) {return true;}
877 else if (pos[0] <= initialpos[0] - min_long) {return true;}
878 }else{ //western hemisphere
879 if (pos[0] <= initialpos[0] - max_long) {return true;}
880 else if (pos[0] >= initialpos[0] + min_long) {return true;}
883 SG_LOG(SG_GENERAL, SG_BULK,"AICarrier: Inside Operating Box" );
889 // return the distance to the horizon, given the altitude and the radius of the earth
890 float FGAICarrier::Horizon(float h) { return RADIUS_M * acos(RADIUS_M / (RADIUS_M + h)); }
892 bool FGAICarrier::InToWind(){
895 if ( fabs(rel_wind) < 5 ) return true;
899 int FGAICarrierHardware::unique_id = 1;