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";
47 FGAICarrier::~FGAICarrier() {
50 void FGAICarrier::setWind_from_east(double fps) {
54 void FGAICarrier::setWind_from_north(double fps) {
55 wind_from_north = fps;
58 void FGAICarrier::setMaxLat(double deg) {
62 void FGAICarrier::setMinLat(double deg) {
66 void FGAICarrier::setMaxLong(double deg) {
70 void FGAICarrier::setMinLong(double deg) {
74 void FGAICarrier::setSolidObjects(const list<string>& so) {
78 void FGAICarrier::setWireObjects(const list<string>& wo) {
82 void FGAICarrier::setCatapultObjects(const list<string>& co) {
83 catapult_objects = co;
86 void FGAICarrier::setParkingPositions(const list<ParkPosition>& p) {
90 void FGAICarrier::setSign(const string& s) {
94 void FGAICarrier::setTACANChannelID(const string& id) {
95 TACAN_channel_id = id;
98 void FGAICarrier::setFlolsOffset(const Point3D& off) {
102 void FGAICarrier::getVelocityWrtEarth(sgdVec3& v, sgdVec3& omega, sgdVec3& pivot) {
103 sgdCopyVec3(v, vel_wrt_earth );
104 sgdCopyVec3(omega, rot_wrt_earth );
105 sgdCopyVec3(pivot, rot_pivot_wrt_earth );
108 void FGAICarrier::update(double dt) {
110 // For computation of rotation speeds we just use finite differences her.
111 // That is perfectly valid since this thing is not driven by accelerations
112 // but by just apply discrete changes at its velocity variables.
113 double old_hdg = hdg;
114 double old_roll = roll;
115 double old_pitch = pitch;
117 // Update the velocity information stored in those nodes.
118 double v_north = 0.51444444*speed*cos(hdg * SGD_DEGREES_TO_RADIANS);
119 double v_east = 0.51444444*speed*sin(hdg * SGD_DEGREES_TO_RADIANS);
121 double sin_lat = sin(pos.lat() * SGD_DEGREES_TO_RADIANS);
122 double cos_lat = cos(pos.lat() * SGD_DEGREES_TO_RADIANS);
123 double sin_lon = sin(pos.lon() * SGD_DEGREES_TO_RADIANS);
124 double cos_lon = cos(pos.lon() * SGD_DEGREES_TO_RADIANS);
125 double sin_roll = sin(roll * SGD_DEGREES_TO_RADIANS);
126 double cos_roll = cos(roll * SGD_DEGREES_TO_RADIANS);
127 double sin_pitch = sin(pitch * SGD_DEGREES_TO_RADIANS);
128 double cos_pitch = cos(pitch * SGD_DEGREES_TO_RADIANS);
129 double sin_hdg = sin(hdg * SGD_DEGREES_TO_RADIANS);
130 double cos_hdg = cos(hdg * SGD_DEGREES_TO_RADIANS);
132 // Transform this back the the horizontal local frame.
135 // set up the transform matrix
136 trans[0][0] = cos_pitch*cos_hdg;
137 trans[0][1] = sin_roll*sin_pitch*cos_hdg - cos_roll*sin_hdg;
138 trans[0][2] = cos_roll*sin_pitch*cos_hdg + sin_roll*sin_hdg;
140 trans[1][0] = cos_pitch*sin_hdg;
141 trans[1][1] = sin_roll*sin_pitch*sin_hdg + cos_roll*cos_hdg;
142 trans[1][2] = cos_roll*sin_pitch*sin_hdg - sin_roll*cos_hdg;
144 trans[2][0] = -sin_pitch;
145 trans[2][1] = sin_roll*cos_pitch;
146 trans[2][2] = cos_roll*cos_pitch;
148 sgdSetVec3( vel_wrt_earth,
149 - cos_lon*sin_lat*v_north - sin_lon*v_east,
150 - sin_lon*sin_lat*v_north + cos_lon*v_east,
152 sgGeodToCart(pos.lat() * SGD_DEGREES_TO_RADIANS,
153 pos.lon() * SGD_DEGREES_TO_RADIANS,
154 pos.elev(), rot_pivot_wrt_earth);
156 // Now update the position and heading. This will compute new hdg and
157 // roll values required for the rotation speed computation.
158 FGAIShip::update(dt);
161 //automatic turn into wind with a target wind of 25 kts otd
162 if(turn_to_launch_hdg){
164 } else if(OutsideBox() || returning) {// check that the carrier is inside the operating box
170 // Only change these values if we are able to compute them safely
172 sgdSetVec3( rot_wrt_earth, 0.0, 0.0, 0.0);
174 // Compute the change of the euler angles.
175 double hdg_dot = SGD_DEGREES_TO_RADIANS * (hdg-old_hdg)/dt;
176 // Always assume that the movement was done by the shorter way.
177 if (hdg_dot < - SGD_DEGREES_TO_RADIANS * 180)
178 hdg_dot += SGD_DEGREES_TO_RADIANS * 360;
179 if (hdg_dot > SGD_DEGREES_TO_RADIANS * 180)
180 hdg_dot -= SGD_DEGREES_TO_RADIANS * 360;
181 double pitch_dot = SGD_DEGREES_TO_RADIANS * (pitch-old_pitch)/dt;
182 // Always assume that the movement was done by the shorter way.
183 if (pitch_dot < - SGD_DEGREES_TO_RADIANS * 180)
184 pitch_dot += SGD_DEGREES_TO_RADIANS * 360;
185 if (pitch_dot > SGD_DEGREES_TO_RADIANS * 180)
186 pitch_dot -= SGD_DEGREES_TO_RADIANS * 360;
187 double roll_dot = SGD_DEGREES_TO_RADIANS * (roll-old_roll)/dt;
188 // Always assume that the movement was done by the shorter way.
189 if (roll_dot < - SGD_DEGREES_TO_RADIANS * 180)
190 roll_dot += SGD_DEGREES_TO_RADIANS * 360;
191 if (roll_dot > SGD_DEGREES_TO_RADIANS * 180)
192 roll_dot -= SGD_DEGREES_TO_RADIANS * 360;
193 /*cout << "euler derivatives = "
194 << roll_dot << " " << pitch_dot << " " << hdg_dot << endl;*/
196 // Now Compute the rotation vector in the carriers coordinate frame
197 // originating from the euler angle changes.
199 body[0] = roll_dot - hdg_dot*sin_pitch;
200 body[1] = pitch_dot*cos_roll + hdg_dot*sin_roll*cos_pitch;
201 body[2] = -pitch_dot*sin_roll + hdg_dot*cos_roll*cos_pitch;
203 // Transform that back to the horizontal local frame.
205 hl[0] = body[0]*trans[0][0] + body[1]*trans[0][1] + body[2]*trans[0][2];
206 hl[1] = body[0]*trans[1][0] + body[1]*trans[1][1] + body[2]*trans[1][2];
207 hl[2] = body[0]*trans[2][0] + body[1]*trans[2][1] + body[2]*trans[2][2];
209 // Now we need to project out rotation components ending in speeds in y
210 // direction in the horizontal local frame.
213 // Transform that to the earth centered frame.
214 sgdSetVec3(rot_wrt_earth,
215 - cos_lon*sin_lat*hl[0] - sin_lon*hl[1] - cos_lat*cos_lon*hl[2],
216 - sin_lon*sin_lat*hl[0] + cos_lon*hl[1] - cos_lat*sin_lon*hl[2],
217 cos_lat*hl[0] - sin_lat*hl[2]);
222 UpdateElevator(dt, transition_time);
226 bool FGAICarrier::init() {
227 if (!FGAIShip::init())
230 // process the 3d model here
231 // mark some objects solid, mark the wires ...
233 // The model should be used for altitude computations.
234 // To avoid that every detail in a carrier 3D model will end into
235 // the aircraft local cache, only set the HOT traversal bit on
237 ssgEntity *sel = aip.getSceneGraph();
238 // Clear the HOT traversal flag
240 // Selectively set that flag again for wires/cats/solid objects.
241 // Attach a pointer to this carrier class to those objects.
242 mark_wires(sel, wire_objects);
243 mark_cat(sel, catapult_objects);
244 mark_solid(sel, solid_objects);
246 _longitude_node = fgGetNode("/position/longitude-deg", true);
247 _latitude_node = fgGetNode("/position/latitude-deg", true);
248 _altitude_node = fgGetNode("/position/altitude-ft", true);
249 // _elevator_node = fgGetNode("/controls/elevators", 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 transition_time = 150;
268 time_constant = 0.005;
273 void FGAICarrier::bind() {
276 props->untie("velocities/true-airspeed-kt");
278 props->tie("controls/flols/source-lights",
279 SGRawValuePointer<int>(&source));
280 props->tie("controls/flols/distance-m",
281 SGRawValuePointer<double>(&dist));
282 props->tie("controls/flols/angle-degs",
283 SGRawValuePointer<double>(&angle));
284 props->tie("controls/turn-to-launch-hdg",
285 SGRawValuePointer<bool>(&turn_to_launch_hdg));
286 props->tie("controls/in-to-wind",
287 SGRawValuePointer<bool>(&turn_to_launch_hdg));
288 props->tie("controls/base-course-deg",
289 SGRawValuePointer<double>(&base_course));
290 props->tie("controls/base-speed-kts",
291 SGRawValuePointer<double>(&base_speed));
292 props->tie("controls/start-pos-lat-deg",
293 SGRawValuePointer<double>(&initialpos[1]));
294 props->tie("controls/start-pos-long-deg",
295 SGRawValuePointer<double>(&initialpos[0]));
296 props->tie("velocities/speed-kts",
297 SGRawValuePointer<double>(&speed));
298 props->tie("environment/surface-wind-speed-true-kts",
299 SGRawValuePointer<double>(&wind_speed_kts));
300 props->tie("environment/surface-wind-from-true-degs",
301 SGRawValuePointer<double>(&wind_from_deg));
302 props->tie("environment/rel-wind-from-degs",
303 SGRawValuePointer<double>(&rel_wind_from_deg));
304 props->tie("environment/rel-wind-from-carrier-hdg-degs",
305 SGRawValuePointer<double>(&rel_wind));
306 props->tie("environment/rel-wind-speed-kts",
307 SGRawValuePointer<double>(&rel_wind_speed_kts));
308 props->tie("controls/flols/wave-off-lights",
309 SGRawValuePointer<bool>(&wave_off_lights));
310 props->tie("controls/elevators",
311 SGRawValuePointer<bool>(&elevators));
312 props->tie("surface-positions/elevators-pos-norm",
313 SGRawValuePointer<double>(&pos_norm));
314 props->tie("controls/elevators-trans-time-s",
315 SGRawValuePointer<double>(&transition_time));
316 props->tie("controls/elevators-time-constant",
317 SGRawValuePointer<double>(&time_constant));
319 props->setBoolValue("controls/flols/cut-lights", false);
320 props->setBoolValue("controls/flols/wave-off-lights", false);
321 props->setBoolValue("controls/flols/cond-datum-lights", true);
322 props->setBoolValue("controls/crew", false);
323 props->setStringValue("navaids/tacan/channel-ID", TACAN_channel_id.c_str());
324 props->setStringValue("sign", sign.c_str());
328 void FGAICarrier::unbind() {
331 props->untie("velocities/true-airspeed-kt");
332 props->untie("controls/flols/source-lights");
333 props->untie("controls/flols/distance-m");
334 props->untie("controls/flols/angle-degs");
335 props->untie("controls/turn-to-launch-hdg");
336 props->untie("velocities/speed-kts");
337 props->untie("environment/wind-speed-true-kts");
338 props->untie("environment/wind-from-true-degs");
339 props->untie("environment/rel-wind-from-degs");
340 props->untie("environment/rel-wind-speed-kts");
341 props->untie("controls/flols/wave-off-lights");
342 props->untie("controls/elevators");
343 props->untie("surface-positions/elevators-pos-norm");
344 props->untie("controls/elevators-trans-time-secs");
345 props->untie("controls/elevators-time-constant");
349 bool FGAICarrier::getParkPosition(const string& id, Point3D& geodPos,
350 double& hdng, sgdVec3 uvw)
353 // FIXME: does not yet cover rotation speeds.
354 list<ParkPosition>::iterator it = ppositions.begin();
355 while (it != ppositions.end()) {
356 // Take either the specified one or the first one ...
357 if ((*it).name == id || id.empty()) {
358 ParkPosition ppos = *it;
359 geodPos = getGeocPosAt(ppos.offset);
360 hdng = hdg + ppos.heading_deg;
361 double shdng = sin(ppos.heading_deg * SGD_DEGREES_TO_RADIANS);
362 double chdng = cos(ppos.heading_deg * SGD_DEGREES_TO_RADIANS);
363 double speed_fps = speed*1.6878099;
364 sgdSetVec3(uvw, chdng*speed_fps, shdng*speed_fps, 0);
374 void FGAICarrier::mark_nohot(ssgEntity* e) {
375 if (e->isAKindOf(ssgTypeBranch())) {
376 ssgBranch* br = (ssgBranch*)e;
378 for ( kid = br->getKid(0); kid != NULL ; kid = br->getNextKid() )
381 br->clrTraversalMaskBits(SSGTRAV_HOT);
383 } else if (e->isAKindOf(ssgTypeLeaf())) {
385 e->clrTraversalMaskBits(SSGTRAV_HOT);
390 bool FGAICarrier::mark_wires(ssgEntity* e, const list<string>& wire_objects, bool mark) {
392 if (e->isAKindOf(ssgTypeBranch())) {
393 ssgBranch* br = (ssgBranch*)e;
396 list<string>::const_iterator it;
397 for (it = wire_objects.begin(); it != wire_objects.end(); ++it)
398 mark = mark || (e->getName() && (*it) == e->getName());
400 for ( kid = br->getKid(0); kid != NULL ; kid = br->getNextKid() )
401 found = mark_wires(kid, wire_objects, mark) || found;
404 br->setTraversalMaskBits(SSGTRAV_HOT);
406 } else if (e->isAKindOf(ssgTypeLeaf())) {
407 list<string>::const_iterator it;
408 for (it = wire_objects.begin(); it != wire_objects.end(); ++it) {
409 if (mark || (e->getName() && (*it) == e->getName())) {
410 e->setTraversalMaskBits(SSGTRAV_HOT);
411 ssgBase* ud = e->getUserData();
413 FGAICarrierHardware* ch = dynamic_cast<FGAICarrierHardware*>(ud);
415 SG_LOG(SG_GENERAL, SG_WARN,
416 "AICarrier: Carrier hardware gets marked twice!\n"
417 " You have probably a whole branch marked as"
418 " a wire which also includes other carrier hardware.");
420 SG_LOG(SG_GENERAL, SG_ALERT,
421 "AICarrier: Found user data attached to a leaf node which "
422 "should be marked as a wire!\n ****Skipping!****");
425 e->setUserData( FGAICarrierHardware::newWire( this ) );
426 ssgLeaf *l = (ssgLeaf*)e;
427 if ( l->getNumLines() != 1 ) {
428 SG_LOG(SG_GENERAL, SG_ALERT,
429 "AICarrier: Found wires not modeled with exactly one line!");
440 bool FGAICarrier::mark_solid(ssgEntity* e, const list<string>& solid_objects, bool mark) {
442 if (e->isAKindOf(ssgTypeBranch())) {
443 ssgBranch* br = (ssgBranch*)e;
446 list<string>::const_iterator it;
447 for (it = solid_objects.begin(); it != solid_objects.end(); ++it)
448 mark = mark || (e->getName() && (*it) == e->getName());
450 for ( kid = br->getKid(0); kid != NULL ; kid = br->getNextKid() )
451 found = mark_solid(kid, solid_objects, mark) || found;
454 br->setTraversalMaskBits(SSGTRAV_HOT);
456 } else if (e->isAKindOf(ssgTypeLeaf())) {
457 list<string>::const_iterator it;
458 for (it = solid_objects.begin(); it != solid_objects.end(); ++it) {
459 if (mark || (e->getName() && (*it) == e->getName())) {
460 e->setTraversalMaskBits(SSGTRAV_HOT);
461 ssgBase* ud = e->getUserData();
464 FGAICarrierHardware* ch = dynamic_cast<FGAICarrierHardware*>(ud);
466 SG_LOG(SG_GENERAL, SG_WARN,
467 "AICarrier: Carrier hardware gets marked twice!\n"
468 " You have probably a whole branch marked solid"
469 " which also includes other carrier hardware.");
471 SG_LOG(SG_GENERAL, SG_ALERT,
472 "AICarrier: Found user data attached to a leaf node which "
473 "should be marked solid!\n ****Skipping!****");
476 e->setUserData( FGAICarrierHardware::newSolid( this ) );
486 bool FGAICarrier::mark_cat(ssgEntity* e, const list<string>& cat_objects, bool mark) {
488 if (e->isAKindOf(ssgTypeBranch())) {
489 ssgBranch* br = (ssgBranch*)e;
492 list<string>::const_iterator it;
493 for (it = cat_objects.begin(); it != cat_objects.end(); ++it)
494 mark = mark || (e->getName() && (*it) == e->getName());
496 for ( kid = br->getKid(0); kid != NULL ; kid = br->getNextKid() )
497 found = mark_cat(kid, cat_objects, mark) || found;
500 br->setTraversalMaskBits(SSGTRAV_HOT);
502 } else if (e->isAKindOf(ssgTypeLeaf())) {
503 list<string>::const_iterator it;
504 for (it = cat_objects.begin(); it != cat_objects.end(); ++it) {
505 if (mark || (e->getName() && (*it) == e->getName())) {
506 e->setTraversalMaskBits(SSGTRAV_HOT);
507 ssgBase* ud = e->getUserData();
509 FGAICarrierHardware* ch = dynamic_cast<FGAICarrierHardware*>(ud);
511 SG_LOG(SG_GENERAL, SG_WARN,
512 "AICarrier: Carrier hardware gets marked twice!\n"
513 "You have probably a whole branch marked as"
514 "a catapult which also includes other carrier hardware.");
516 SG_LOG(SG_GENERAL, SG_ALERT,
517 "AICarrier: Found user data attached to a leaf node which "
518 "should be marked as a catapult!\n ****Skipping!****");
521 e->setUserData( FGAICarrierHardware::newCatapult( this ) );
522 ssgLeaf *l = (ssgLeaf*)e;
523 if ( l->getNumLines() != 1 ) {
524 SG_LOG(SG_GENERAL, SG_ALERT,
525 "AICarrier: Found a cat not modeled with exactly "
528 // Now some special code to make sure the cat points in the right
529 // direction. The 0 index must be the backward end, the 1 index
531 // Forward is positive x-direction in our 3D model, also the model
532 // as such is flattened when it is loaded, so we do not need to
533 // care for transforms ...
535 l->getLine(0, v, v+1 );
537 for (int k=0; k<2; ++k)
538 sgCopyVec3( ends[k], l->getVertex( v[k] ) );
540 // When the 1 end is behind the 0 end, swap the coordinates.
541 if (ends[0][0] < ends[1][0]) {
542 sgCopyVec3( l->getVertex( v[0] ), ends[1] );
543 sgCopyVec3( l->getVertex( v[1] ), ends[0] );
555 void FGAICarrier::UpdateFlols(const sgdMat3& trans) {
560 double flolsXYZ[3], eyeXYZ[3];
561 double lat, lon, alt;
565 /* cout << "x_offset " << flols_x_offset
566 << " y_offset " << flols_y_offset
567 << " z_offset " << flols_z_offset << endl;
569 cout << "roll " << roll
570 << " heading " << hdg
571 << " pitch " << pitch << endl;
573 cout << "carrier lon " << pos[0]
575 << " alt " << pos[2] << endl;
578 // set the Flols initial position to the carrier position
582 /* cout << "flols lon " << flolspos[0]
583 << " lat " << flolspos[1]
584 << " alt " << flolspos[2] << endl;
586 // set the offsets in metres
588 cout << "flols_x_offset " << flols_x_offset << endl
589 << "flols_y_offset " << flols_y_offset << endl
590 << "flols_z_offset " << flols_z_offset << endl;
593 in[0] = flols_off.x();
594 in[1] = flols_off.y();
595 in[2] = flols_off.z();
597 // multiply the input and transform matrices
598 out[0] = in[0] * trans[0][0] + in[1] * trans[0][1] + in[2] * trans[0][2];
599 out[1] = in[0] * trans[1][0] + in[1] * trans[1][1] + in[2] * trans[1][2];
600 out[2] = in[0] * trans[2][0] + in[1] * trans[2][1] + in[2] * trans[2][2];
602 // convert meters to ft to degrees of latitude
603 out[0] = (out[0] * 3.28083989501) /
604 (366468.96 - 3717.12 * cos(flolspos[0] * SG_DEGREES_TO_RADIANS));
606 // convert meters to ft to degrees of longitude
607 out[1] = (out[1] * 3.28083989501) /
608 (365228.16 * cos(flolspos[1] * SG_DEGREES_TO_RADIANS));
610 /* cout << "lat adjust deg" << out[0]
611 << " lon adjust deg " << out[1]
612 << " alt adjust m " << out[2] << endl;
615 // adjust Flols position
616 flolspos[0] += out[0];
617 flolspos[1] += out[1];
618 flolspos[2] += out[2];
620 // convert flols position to cartesian co-ordinates
621 sgGeodToCart(flolspos[1] * SG_DEGREES_TO_RADIANS,
622 flolspos[0] * SG_DEGREES_TO_RADIANS,
623 flolspos[2] , flolsXYZ );
626 /* cout << "flols X " << flolsXYZ[0]
627 << " Y " << flolsXYZ[1]
628 << " Z " << flolsXYZ[2] << endl;
630 // check the conversion
632 sgCartToGeod(flolsXYZ, &lat, &lon, &alt);
634 cout << "flols check lon " << lon
636 << " alt " << alt << endl;
639 // get the current position of the pilot's eyepoint (cartesian coordinates)
640 sgdCopyVec3( eyeXYZ, globals->get_current_view()->get_absolute_view_pos() );
642 /* cout << "Eye_X " << eyeXYZ[0]
643 << " Eye_Y " << eyeXYZ[1]
644 << " Eye_Z " << eyeXYZ[2] << endl;
647 sgCartToGeod(eyeXYZ, &lat, &lon, &alt);
649 eyepos[0] = lon * SG_RADIANS_TO_DEGREES;
650 eyepos[1] = lat * SG_RADIANS_TO_DEGREES;
653 /* cout << "eye lon " << eyepos[0]
654 << " eye lat " << eyepos[1]
655 << " eye alt " << eyepos[2] << endl;
658 //calculate the distance from eye to flols
659 dist = sgdDistanceVec3( flolsXYZ, eyeXYZ );
661 //apply an index error
664 //cout << "distance " << dist << endl;
668 // calculate height above FLOLS
669 double y = eyepos[2] - flolspos[2];
671 // calculate the angle from the flols to eye
672 // above the horizontal
676 angle = asin( y / dist );
680 angle *= SG_RADIANS_TO_DEGREES;
683 // cout << " height " << y << " angle " << angle ;
685 // set the value of source
687 if ( angle <= 4.35 && angle > 4.01 )
689 else if ( angle <= 4.01 && angle > 3.670 )
691 else if ( angle <= 3.670 && angle > 3.330 )
693 else if ( angle <= 3.330 && angle > 2.990 )
695 else if ( angle <= 2.990 && angle > 2.650 )
697 else if ( angle <= 2.650 )
702 // cout << " source " << source << endl;
708 // find relative wind
709 void FGAICarrier::UpdateWind( double dt) {
713 //calculate the reciprocal hdg
720 //cout <<" heading: " << hdg << "recip: " << recip << endl;
722 //get the surface wind speed and direction
723 wind_from_deg = _surface_wind_from_deg_node->getDoubleValue();
724 wind_speed_kts = _surface_wind_speed_node->getDoubleValue();
726 //calculate the surface wind speed north and east in kts
727 double wind_speed_from_north_kts = cos( wind_from_deg / SGD_RADIANS_TO_DEGREES )* wind_speed_kts ;
728 double wind_speed_from_east_kts = sin( wind_from_deg / SGD_RADIANS_TO_DEGREES )* wind_speed_kts ;
730 //calculate the carrier speed north and east in kts
731 double speed_north_kts = cos( hdg / SGD_RADIANS_TO_DEGREES )* speed ;
732 double speed_east_kts = sin( hdg / SGD_RADIANS_TO_DEGREES )* speed ;
734 //calculate the relative wind speed north and east in kts
735 double rel_wind_speed_from_east_kts = wind_speed_from_east_kts + speed_east_kts;
736 double rel_wind_speed_from_north_kts = wind_speed_from_north_kts + speed_north_kts;
738 //combine relative speeds north and east to get relative windspeed in kts
739 rel_wind_speed_kts = sqrt((rel_wind_speed_from_east_kts * rel_wind_speed_from_east_kts)
740 + (rel_wind_speed_from_north_kts * rel_wind_speed_from_north_kts));
742 //calculate the relative wind direction
743 rel_wind_from_deg = atan(rel_wind_speed_from_east_kts/rel_wind_speed_from_north_kts)
744 * SG_RADIANS_TO_DEGREES;
746 // rationalise the output
747 if (rel_wind_speed_from_north_kts <= 0) {
748 rel_wind_from_deg = 180 + rel_wind_from_deg;
750 if(rel_wind_speed_from_east_kts <= 0)
751 rel_wind_from_deg = 360 + rel_wind_from_deg;
755 rel_wind = rel_wind_from_deg - hdg;
759 //switch the wave-off lights
761 wave_off_lights = false;
763 wave_off_lights = true;
765 // cout << "rel wind: " << rel_wind << endl;
770 void FGAICarrier::TurnToLaunch(){
772 //calculate tgt speed
773 double tgt_speed = 25 - wind_speed_kts;
778 FGAIShip::TurnTo(wind_from_deg);
779 FGAIShip::AccelTo(tgt_speed);
784 void FGAICarrier::TurnToBase(){
787 FGAIShip::TurnTo(base_course);
788 FGAIShip::AccelTo(base_speed);
793 void FGAICarrier::ReturnToBox(){
794 double course, distance, az2;
796 //get the carrier position
799 //cout << "lat: " << carrierpos[1] << " lon: " << carrierpos[0] << endl;
801 //calculate the bearing and range of the initial position from the carrier
802 geo_inverse_wgs_84(carrierpos[2],
807 &course, &az2, &distance);
809 distance *= SG_METER_TO_NM;
811 //cout << "return course: " << course << " distance: " << distance << endl;
813 FGAIShip::TurnTo(course);
814 FGAIShip::AccelTo(base_speed);
821 } // end turn to base
824 bool FGAICarrier::OutsideBox() { //returns true if the carrier is outside operating box
826 if ( max_lat == 0 && min_lat == 0 && max_long == 0 && min_long == 0) {
827 SG_LOG(SG_GENERAL, SG_DEBUG, "AICarrier: No Operating Box defined" );
831 if (initialpos[1] >= 0) { //northern hemisphere
832 if (pos[1] >= initialpos[1] + max_lat)
835 if (pos[1] <= initialpos[1] - min_lat)
838 } else { //southern hemisphere
839 if (pos[1] <= initialpos[1] - max_lat)
842 if (pos[1] >= initialpos[1] + min_lat)
846 if (initialpos[0] >=0) { //eastern hemisphere
847 if (pos[0] >= initialpos[0] + max_long)
850 if (pos[0] <= initialpos[0] - min_long)
853 } else { //western hemisphere
854 if (pos[0] <= initialpos[0] - max_long)
857 if (pos[0] >= initialpos[0] + min_long)
861 SG_LOG(SG_GENERAL, SG_DEBUG, "AICarrier: Inside Operating Box" );
867 // return the distance to the horizon, given the altitude and the radius of the earth
868 float FGAICarrier::Horizon(float h) {
869 return RADIUS_M * acos(RADIUS_M / (RADIUS_M + h));
873 bool FGAICarrier::InToWind() {
874 if ( fabs(rel_wind) < 5 )
881 void FGAICarrier::UpdateElevator(double dt, double transition_time) {
883 if ((elevators && pos_norm >= 1 ) || (!elevators && pos_norm <= 0 ))
886 // move the elevators
888 step += dt/transition_time;
893 step -= dt/transition_time;
897 // assume a linear relationship
899 if (raw_pos_norm >= 1) {
901 } else if (raw_pos_norm <= 0) {
906 pos_norm = (raw_pos_norm * time_constant) + (pos_norm * (1 - time_constant));
909 } // end UpdateElevator
912 int FGAICarrierHardware::unique_id = 1;