1 // FGTower - a class to provide tower control at towered airports.
3 // Written by David Luff, started March 2002.
5 // Copyright (C) 2002 David C. Luff - david.luff@nottingham.ac.uk
7 // This program is free software; you can redistribute it and/or
8 // modify it under the terms of the GNU General Public License as
9 // published by the Free Software Foundation; either version 2 of the
10 // License, or (at your option) any later version.
12 // This program is distributed in the hope that it will be useful, but
13 // WITHOUT ANY WARRANTY; without even the implied warranty of
14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 // General Public License for more details.
17 // You should have received a copy of the GNU General Public License
18 // along with this program; if not, write to the Free Software
19 // Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
24 #include <simgear/compiler.h>
25 #include <simgear/math/point3d.hxx>
26 #include <simgear/misc/sgstream.hxx>
36 #include "ATCProjection.hxx"
37 #include "AIPlane.hxx"
42 //DCL - a complete guess for now.
43 #define FG_TOWER_DEFAULT_RANGE 30
45 enum tower_traffic_type {
47 INBOUND, // CIRCUIT traffic gets changed to INBOUND when on final of the full-stop circuit.
49 TTT_UNKNOWN, // departure, but we don't know if for circuits or leaving properly
53 ostream& operator << (ostream& os, tower_traffic_type ttt);
55 enum tower_callback_type {
56 USER_REQUEST_VFR_DEPARTURE = 1,
57 USER_REQUEST_VFR_ARRIVAL = 2,
58 USER_REQUEST_VFR_ARRIVAL_FULL_STOP = 3,
59 USER_REQUEST_VFR_ARRIVAL_TOUCH_AND_GO = 4,
60 USER_REPORT_3_MILE_FINAL = 5,
61 USER_REPORT_DOWNWIND = 6,
62 USER_REPORT_RWY_VACATED = 7,
63 USER_REPORT_GOING_AROUND = 8
66 // TODO - need some differentiation of IFR and VFR traffic in order to give the former priority.
68 // Structure for holding details of a plane under tower control.
69 // Not fixed yet - may include more stuff later.
75 TowerPlaneRec(const PlaneRec& p);
76 TowerPlaneRec(const Point3D& pt);
77 TowerPlaneRec(const PlaneRec& p, const Point3D& pt);
79 FGAIPlane* planePtr; // This might move to the planeRec eventually
83 double eta; // seconds
84 double dist_out; // meters from theshold
87 bool clearedToTakeOff;
88 // ought to add time cleared to depart so we can nag if necessary
89 bool holdShortReported;
90 bool downwindReported;
91 bool longFinalReported;
92 bool longFinalAcknowledged;
94 bool finalAcknowledged;
95 bool rwyVacatedReported;
96 bool rwyVacatedAcknowledged;
97 bool goAroundReported; // set true if plane informs tower that it's going around.
98 bool instructedToGoAround; // set true if plane told by tower to go around.
99 bool onRwy; // is physically on the runway
100 bool nextOnRwy; // currently projected by tower to be the next on the runway
102 bool vfrArrivalReported;
103 bool vfrArrivalAcknowledged;
105 // Type of operation the plane is doing
106 tower_traffic_type opType;
108 // Whereabouts in circuit if doing circuits
111 LandingType landingType;
112 bool isUser; // true if this plane is the user
116 typedef list < TowerPlaneRec* > tower_plane_rec_list_type;
117 typedef tower_plane_rec_list_type::iterator tower_plane_rec_list_iterator;
118 typedef tower_plane_rec_list_type::const_iterator tower_plane_rec_list_const_iterator;
121 class FGTower : public FGATC {
130 void Update(double dt);
132 void ReceiveUserCallback(int code);
134 // Contact tower for VFR approach
135 // eg "Cessna Charlie Foxtrot Golf Foxtrot Sierra eight miles South of the airport for full stop with Bravo"
136 // This function probably only called via user interaction - AI planes will have an overloaded function taking a planerec.
137 void VFRArrivalContact(const string& ID, const LandingType& opt = AIP_LT_UNKNOWN);
138 // For the AI planes...
139 void VFRArrivalContact(const PlaneRec& plane, FGAIPlane* requestee, const LandingType& lt = AIP_LT_UNKNOWN);
141 void RequestDepartureClearance(const string& ID);
142 void ReportFinal(const string& ID);
143 void ReportLongFinal(const string& ID);
144 void ReportOuterMarker(const string& ID);
145 void ReportMiddleMarker(const string& ID);
146 void ReportInnerMarker(const string& ID);
147 void ReportRunwayVacated(const string& ID);
148 void ReportReadyForDeparture(const string& ID);
149 void ReportDownwind(const string& ID);
150 void ReportGoingAround(const string& ID);
152 // Contact tower when at a hold short for departure - for now we'll assume plane - maybe vehicles might want to cross runway eventually?
153 void ContactAtHoldShort(const PlaneRec& plane, FGAIPlane* requestee, tower_traffic_type operation);
155 // Register the presence of an AI plane at a point where contact would already have been made in real life
156 // CAUTION - currently it is assumed that this plane's callsign is unique - it is up to AIMgr to generate unique callsigns.
157 void RegisterAIPlane(const PlaneRec& plane, FGAIPlane* ai, const tower_traffic_type& op, const PatternLeg& lg = LEG_UNKNOWN);
159 // Deregister and remove an AI plane.
160 void DeregisterAIPlane(const string& id);
162 // Public interface to the active runway - this will get more complex
163 // in the future and consider multi-runway use, airplane weight etc.
164 inline const string& GetActiveRunway() const { return activeRwy; }
165 inline const RunwayDetails& GetActiveRunwayDetails() const { return rwy; }
166 // Get the pattern direction of the active rwy.
167 inline int GetPatternDirection() const { return rwy.patternDirection; }
169 inline const string& get_trans_ident() const { return trans_ident; }
171 inline FGGround* const GetGroundPtr() const { return ground; }
173 // Returns true if positions of crosswind/downwind/base leg turns should be constrained by previous traffic
174 // plus the constraint position as a rwy orientated orthopos (meters)
175 bool GetCrosswindConstraint(double& cpos);
176 bool GetDownwindConstraint(double& dpos);
177 bool GetBaseConstraint(double& bpos);
179 string GenText(const string& m, int c);
183 // This is purely for synactic convienience to avoid writing globals->get_ATC_mgr()-> all through the code!
185 // Respond to a transmission
188 void ProcessRunwayVacatedReport(TowerPlaneRec* t);
189 void ProcessDownwindReport(TowerPlaneRec* t);
191 // Remove all options from the user dialog choice
192 void RemoveAllUserDialogOptions();
194 // Periodic checks on the various traffic.
195 void CheckHoldList(double dt);
196 void CheckCircuitList(double dt);
197 void CheckRunwayList(double dt);
198 void CheckApproachList(double dt);
199 void CheckDepartureList(double dt);
201 // Currently this assumes we *are* next on the runway and doesn't check for planes about to land -
202 // this should be done prior to calling this function.
203 void ClearHoldingPlane(TowerPlaneRec* t);
205 // Find a pointer to plane of callsign ID within the internal data structures
206 TowerPlaneRec* FindPlane(const string& ID);
208 // Remove and delete all instances of a plane with a given ID
209 void RemovePlane(const string& ID);
211 // Figure out if a given position lies on the active runway
212 // Might have to change when we consider more than one active rwy.
213 bool OnActiveRunway(const Point3D& pt);
215 // Figure out if a given position lies on a runway or not
216 bool OnAnyRunway(const Point3D& pt);
218 // Calculate the eta of a plane to the threshold.
219 // For ground traffic this is the fastest they can get there.
220 // For air traffic this is the middle approximation.
221 void CalcETA(TowerPlaneRec* tpr, bool printout = false);
223 // Iterate through all the lists and call CalcETA for all the planes.
224 void doThresholdETACalc();
226 // Order the list of traffic as per expected threshold use and flag any conflicts
227 bool doThresholdUseOrder();
229 // Calculate the crow-flys distance of a plane to the threshold in meters
230 double CalcDistOutM(TowerPlaneRec* tpr);
232 // Calculate the crow-flys distance of a plane to the threshold in miles
233 double CalcDistOutMiles(TowerPlaneRec* tpr);
236 void doCommunication();
239 void IssueLandingClearance(TowerPlaneRec* tpr);
240 void IssueGoAround(TowerPlaneRec* tpr);
241 void IssueDepartureClearance(TowerPlaneRec* tpr);
243 unsigned int update_count; // Convienince counter for speading computational load over several updates
244 unsigned int update_count_max; // ditto.
246 double timeSinceLastDeparture; // Time in seconds since last departure from active rwy.
247 bool departed; // set true when the above needs incrementing with time, false when it doesn't.
249 // environment - need to make sure we're getting the surface winds and not winds aloft.
250 SGPropertyNode_ptr wind_from_hdg; //degrees
251 SGPropertyNode_ptr wind_speed_knots; //knots
253 double aptElev; // Airport elevation
254 string activeRwy; // Active runway number - For now we'll disregard multiple / alternate runway operation.
255 RunwayDetails rwy; // Assumed to be the active one for now.
256 bool rwyOccupied; // Active runway occupied flag. For now we'll disregard land-and-hold-short operations.
257 FGATCAlignedProjection ortho; // Orthogonal mapping of the local area with the active runway threshold at the origin
259 // Figure out which runways are active.
260 // For now we'll just be simple and do one active runway - eventually this will get much more complex
261 // This is a private function - public interface to the results of this is through GetActiveRunway
264 // Need a data structure to hold details of the various active planes
265 // or possibly another data structure with the positions of the inactive planes.
266 // Need a data structure to hold outstanding communications from aircraft.
268 // Linked-list of planes on approach to active rwy ordered with nearest first (timewise).
269 // Includes planes that have landed but not yet vacated runway.
270 // Somewhat analagous to the paper strips used (used to be used?) in real life.
271 // Doesn't include planes in circuit until they turn onto base/final?
272 // TODO - may need to alter this for operation to more than one active rwy.
273 tower_plane_rec_list_type appList;
274 tower_plane_rec_list_iterator appListItr;
276 // What should we do with planes approaching the airport to join the circuit somewhere
277 // but not on straight-in though? - put them in here for now.
278 tower_plane_rec_list_type circuitAppList;
279 tower_plane_rec_list_iterator circuitAppListItr;
281 // List of departed planes (planes doing circuits go into circuitList not depList after departure)
282 tower_plane_rec_list_type depList;
283 tower_plane_rec_list_iterator depListItr;
285 // List of planes in the circuit (ordered by nearest to landing first)
286 tower_plane_rec_list_type circuitList;
287 tower_plane_rec_list_iterator circuitListItr;
289 // List of planes waiting to depart
290 tower_plane_rec_list_type holdList;
291 tower_plane_rec_list_iterator holdListItr;
293 // List of planes on rwy
294 tower_plane_rec_list_type rwyList;
295 tower_plane_rec_list_iterator rwyListItr;
297 // List of all planes due to use a given rwy arranged in projected order of rwy use
298 tower_plane_rec_list_type trafficList; // TODO - needs to be expandable to more than one rwy
299 tower_plane_rec_list_iterator trafficListItr;
301 // List of planes that have vacated the runway inbound but not yet handed off to ground
302 tower_plane_rec_list_type vacatedList;
303 tower_plane_rec_list_iterator vacatedListItr;
305 // Returns true if successful
306 bool RemoveFromTrafficList(const string& id);
307 bool RemoveFromAppList(const string& id);
308 bool RemoveFromRwyList(const string& id);
310 // Return the ETA of plane no. list_pos (1-based) in the traffic list.
311 // i.e. list_pos = 1 implies next to use runway.
312 double GetTrafficETA(unsigned int list_pos, bool printout = false);
314 // Add a tower plane rec with ETA to the traffic list in the correct position ETA-wise.
315 // Returns true if this could cause a threshold ETA conflict with other traffic, false otherwise.
316 bool AddToTrafficList(TowerPlaneRec* t, bool holding = false);
318 bool AddToCircuitList(TowerPlaneRec* t);
320 // Add to vacated list only if not already present
321 void AddToVacatedList(TowerPlaneRec* t);
323 // Ground can be separate or handled by tower in real life.
324 // In the program we will always use a separate FGGround class, but we need to know
325 // whether it is supposed to be separate or not to give the correct instructions.
326 bool separateGround; // true if ground control is separate
327 FGGround* ground; // The ground control associated with this airport.
329 bool _departureControlled; // true if we need to hand off departing traffic to departure control
330 //FGDeparture* _departure; // The relevant departure control (once we've actually written it!)
332 // for failure modeling
333 string trans_ident; // transmitted ident
334 bool tower_failed; // tower failed?
336 // Pointers to current users position and orientation
337 SGPropertyNode_ptr user_lon_node;
338 SGPropertyNode_ptr user_lat_node;
339 SGPropertyNode_ptr user_elev_node;
340 SGPropertyNode_ptr user_hdg_node;
342 // Details of the general traffic flow etc in the circuit
343 double crosswind_leg_pos; // Distance from threshold crosswind leg is being turned to in meters (actual operation - *not* ideal circuit)
344 double downwind_leg_pos; // Actual offset distance in meters from the runway that planes are flying the downwind leg
345 // Currently not sure whether the above should be always +ve or just take the natural orthopos sign (+ve for RH circuit, -ve for LH).
346 double base_leg_pos; // Actual offset distance from the threshold (-ve) that planes are turning to base leg.
348 double nominal_crosswind_leg_pos;
349 double nominal_downwind_leg_pos;
350 double nominal_base_leg_pos;
352 friend istream& operator>> ( istream&, FGTower& );
355 #endif //_FG_TOWER_HXX