1 // dclgps.hxx - a class to extend the operation of FG's current GPS
2 // code, and provide support for a KLN89-specific instrument. It
3 // is envisioned that eventually this file and class will be split
4 // up between current FG code and new KLN89-specific code and removed.
6 // Written by David Luff, started 2005.
8 // Copyright (C) 2005 - David C Luff: daveluff --AT-- ntlworld --D0T-- com
10 // This program is free software; you can redistribute it and/or
11 // modify it under the terms of the GNU General Public License as
12 // published by the Free Software Foundation; either version 2 of the
13 // License, or (at your option) any later version.
15 // This program is distributed in the hope that it will be useful, but
16 // WITHOUT ANY WARRANTY; without even the implied warranty of
17 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 // General Public License for more details.
20 // You should have received a copy of the GNU General Public License
21 // along with this program; if not, write to the Free Software
22 // Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
29 #include "render_area_2d.hxx"
35 #include <simgear/structure/subsystem_mgr.hxx>
36 #include <Navaids/positioned.hxx>
46 // --------------------- Waypoint / Flightplan stuff -----------------------------
47 // This should be merged with other similar stuff in FG at some point.
49 // NOTE - ORDERING IS IMPORTANT HERE - it matches the Bendix-King page ordering!
56 GPS_WP_VIRT // Used for virtual waypoints, such as the start of DTO operation.
60 GPS_IAF, // Initial approach fix
61 GPS_IAP, // Waypoint on approach sequence that isn't any of the others.
62 GPS_FAF, // Final approach fix
63 GPS_MAP, // Missed approach point
64 GPS_MAHP, // Initial missed approach holding point.
65 GPS_HDR, // A virtual 'waypoint' to represent the approach header in the fpl page
66 GPS_FENCE, // A virtual 'waypoint' to represent the NO WPT SEQ fence.
67 GPS_APP_NONE // Not part of the approach sequence - the default.
70 ostream& operator << (ostream& os, GPSAppWpType type);
75 GPSWaypoint(const std::string& aIdent, float lat, float lon, GPSWpType aType);
77 static GPSWaypoint* createFromPositioned(const FGPositioned* aFix);
80 string GetAprId(); // Returns the id with i, f, m or h added if appropriate. (Initial approach fix, final approach fix, etc)
85 GPSAppWpType appType; // only used for waypoints that are part of an approach sequence
88 typedef vector < GPSWaypoint* > gps_waypoint_array;
89 typedef gps_waypoint_array::iterator gps_waypoint_array_iterator;
90 typedef map < string, gps_waypoint_array > gps_waypoint_map;
91 typedef gps_waypoint_map::iterator gps_waypoint_map_iterator;
92 typedef gps_waypoint_map::const_iterator gps_waypoint_map_const_iterator;
96 vector<GPSWaypoint*> waypoints;
97 inline bool IsEmpty() { return(waypoints.size() == 0); }
100 // TODO - probably de-public the internals of the next 2 classes and add some methods!
101 // Instrument approach procedure base class
105 virtual ~FGIAP() = 0;
108 string _aptIdent; // The ident of the airport this approach is for
109 string _ident; // The approach ident.
110 string _name; // The full approach name.
111 string _rwyStr; // The string used to specify the rwy - eg "B" in this instance.
112 bool _precision; // True for precision approach, false for non-precision.
115 // Non-precision instrument approach procedure
116 class FGNPIAP : public FGIAP {
122 vector<GPSFlightPlan*> _approachRoutes; // The approach route(s) from the IAF(s) to the IF.
123 // NOTE: It is an assumption in the code that uses this that there is a unique IAF per approach route.
124 vector<GPSWaypoint*> _IAP; // The compulsory waypoints of the approach procedure (may duplicate one of the above).
125 // _IAP includes the FAF and MAF, and the missed approach waypoints.
128 typedef vector < FGIAP* > iap_list_type;
129 typedef map < string, iap_list_type > iap_map_type;
130 typedef iap_map_type::iterator iap_map_iterator;
132 // A class to encapsulate hr:min representation of time.
137 ClockTime(int hr, int min);
139 inline void set_hr(int hr) { _hr = hr; }
140 inline int hr() const { return(_hr); }
141 inline void set_min(int min) { _min = min; }
142 inline int min() const { return(_min); }
144 ClockTime operator+ (const ClockTime& t) {
145 int cumMin = _hr * 60 + _min + t.hr() * 60 + t.min();
146 ClockTime t2(cumMin / 60, cumMin % 60);
149 // Operator - has a max difference of 23:59,
150 // and assumes the day has wrapped if the second operand
151 // is larger that the first.
152 // eg. 2:59 - 3:00 = 23:59
153 ClockTime operator- (const ClockTime& t) {
154 int diff = (_hr * 60 + _min) - (t.hr() * 60 + t.min());
155 if(diff < 0) { diff += 24 * 60; }
156 ClockTime t2(diff / 60, diff % 60);
159 friend ostream& operator<< (ostream& out, const ClockTime& t);
166 // ------------------------------------------------------------------------------
168 // TODO - merge generic GPS functions instead and split out KLN specific stuff.
169 class DCLGPS : public SGSubsystem {
172 DCLGPS(RenderArea2D* instrument);
173 virtual ~DCLGPS() = 0;
175 virtual void draw(osg::State& state);
179 virtual void unbind();
180 virtual void update(double dt);
182 // Expand a SIAP ident to the full procedure name.
183 string ExpandSIAPIdent(const string& ident);
185 // Render string s in display field field at position x, y
186 // WHERE POSITION IS IN CHARACTER UNITS!
188 virtual void DrawText(const string& s, int field, int px, int py, bool bold = false);
190 // Render a char at a given position as above
191 virtual void DrawChar(char c, int field, int px, int py, bool bold = false);
193 virtual void ToggleOBSMode();
195 // Set the number of fields
196 inline void SetNumFields(int n) { _nFields = (n > _maxFields ? _maxFields : (n < 1 ? 1 : n)); }
198 // It is expected that specific GPS units will override these functions.
199 // Increase the CDI full-scale deflection (ie. increase the nm per dot) one (GPS unit dependent) increment. Wraps if necessary (GPS unit dependent).
200 virtual void CDIFSDIncrease();
201 // Ditto for decrease the distance per dot
202 virtual void CDIFSDDecrease();
205 ////inline void SetOverlays(Overlays* overlays) { _overlays = overlays; }
207 virtual void CreateDefaultFlightPlans();
209 void SetOBSFromWaypoint();
211 GPSWaypoint* GetActiveWaypoint();
212 // Get the (zero-based) position of the active waypoint in the active flightplan
213 // Returns -1 if no active waypoint.
214 int GetActiveWaypointIndex();
215 // Ditto for an arbitrary waypoint id
216 int GetWaypointIndex(const string& id);
219 float GetDistToActiveWaypoint();
220 // Returns degrees (magnetic)
221 float GetHeadingToActiveWaypoint();
222 // Returns degrees (magnetic)
223 float GetHeadingFromActiveWaypoint();
224 // Get the time to the active waypoint in seconds.
225 // Returns -1 if groundspeed < 30 kts
226 double GetTimeToActiveWaypoint();
227 // Get the time to the final waypoint in seconds.
228 // Returns -1 if groundspeed < 30 kts
230 // Get the time to a given waypoint (spec'd by ID) in seconds.
231 // returns -1 if groundspeed is less than 30kts.
232 // If the waypoint is an unreached part of the active flight plan the time will be via each leg.
233 // otherwise it will be a direct-to time.
234 double GetTimeToWaypoint(const string& id);
236 // Return true if waypoint alerting is occuring
237 inline bool GetWaypointAlert() const { return(_waypointAlert); }
238 // Return true if in OBS mode
239 inline bool GetOBSMode() const { return(_obsMode); }
240 // Return true if in Leg mode
241 inline bool GetLegMode() const { return(!_obsMode); }
243 // Clear a flightplan
244 void ClearFlightPlan(int n);
245 void ClearFlightPlan(GPSFlightPlan* fp);
247 // Returns true if an approach is loaded/armed/active in the active flight plan
248 inline bool ApproachLoaded() const { return(_approachLoaded); }
249 inline bool GetApproachArm() const { return(_approachArm); }
250 inline bool GetApproachActive() const { return(_approachActive); }
251 double GetCDIDeflection() const;
252 inline bool GetToFlag() const { return(_headingBugTo); }
254 // Initiate Direct To operation to the supplied ID.
255 virtual void DtoInitiate(const string& id);
256 // Cancel Direct To operation
260 // Maximum number of display fields for this device
262 // Current number of on-screen fields
268 // Lower (y) border per field
269 int _yFieldBorder[4];
270 // Left (x) border per field
271 int _xFieldBorder[4];
272 // Field start in x dir (border is part of field since it is the normal char border - sometimes map mode etc draws in it)
274 // Field start in y dir (for completeness - KLN89 only has vertical divider.
277 // The number of pages on the cyclic knob control
278 unsigned int _nPages;
279 // The current page we're on (Not sure how this ties in with extra pages such as direct or nearest).
280 unsigned int _curPage;
283 RenderArea2D* _instrument;
285 // CDI full-scale deflection, specified either as an index into a vector of values (standard values) or as a double precision float (intermediate values).
286 // This will influence how an externally driven CDI will display as well as the NAV1 page.
287 // Hence the variables are located here, not in the nav page class.
288 vector<float> _cdiScales;
289 unsigned int _currentCdiScaleIndex;
290 bool _cdiScaleTransition; // Set true when the floating CDI value is used during transitions
291 double _currentCdiScale; // The floating value to use.
292 unsigned int _targetCdiScaleIndex; // The target indexed value to attain during a transition.
293 unsigned int _sourceCdiScaleIndex; // The source indexed value during a transition - so we know which way we're heading!
294 // Timers to handle the transitions - not sure if we need these.
295 double _apprArmTimer;
296 double _apprActvTimer;
297 double _cdiTransitionTime; // Time for transition to occur in - normally 30sec but may be quicker if time to FAF < 30sec?
300 // Data and lookup functions
304 void LoadApproachData();
306 // Find first of any type of waypoint by id. (TODO - Possibly we should return multiple waypoints here).
307 GPSWaypoint* FindFirstById(const string& id) const;
308 GPSWaypoint* FindFirstByExactId(const string& id) const;
310 FGNavRecord* FindFirstVorById(const string& id, bool &multi, bool exact = false);
311 FGNavRecord* FindFirstNDBById(const string& id, bool &multi, bool exact = false);
312 const FGAirport* FindFirstAptById(const string& id, bool &multi, bool exact = false);
313 const FGFix* FindFirstIntById(const string& id, bool &multi, bool exact = false);
314 // Find the closest VOR to a position in RADIANS.
315 FGNavRecord* FindClosestVor(double lat_rad, double lon_rad);
317 // helper to implement the above FindFirstXXX methods
318 FGPositioned* FindTypedFirstById(const std::string& id, FGPositioned::Type ty, bool &multi, bool exact);
320 // Position, orientation and velocity.
321 // These should be read from FG's built-in GPS logic if possible.
322 // Use the property node pointers below to do this.
323 SGPropertyNode_ptr _lon_node;
324 SGPropertyNode_ptr _lat_node;
325 SGPropertyNode_ptr _alt_node;
326 SGPropertyNode_ptr _grnd_speed_node;
327 SGPropertyNode_ptr _true_track_node;
328 SGPropertyNode_ptr _mag_track_node;
329 // Present position. (Radians)
331 // Present altitude (ft). (Yuk! but it saves converting ft->m->ft every update).
333 // Reported position as measured by GPS. For now this is the same
334 // as present position, but in the future we might want to model
335 // GPS lat and lon errors.
336 // Note - we can depriciate _gpsLat and _gpsLon if we implement error handling in FG
337 // gps code and not our own.
338 double _gpsLat, _gpsLon; //(Radians)
339 // Hack - it seems that the GPS gets initialised before FG's initial position is properly set.
340 // By checking for abnormal slew in the position we can force a re-initialisation of active flight
341 // plan leg and anything else that might be affected.
342 // TODO - sort FlightGear's initialisation order properly!!!
343 double _checkLat, _checkLon; // (Radians)
344 double _groundSpeed_ms; // filtered groundspeed (m/s)
345 double _groundSpeed_kts; // ditto in knots
346 double _track; // filtered true track (degrees)
347 double _magTrackDeg; // magnetic track in degrees calculated from true track above
349 // _navFlagged is set true when GPS navigation is either not possible or not logical.
350 // This includes not receiving adequate signals, and not having an active flightplan entered.
353 // Positional functions copied from ATCutils that might get replaced
354 // INPUT in RADIANS, returns DEGREES!
356 double GetMagHeadingFromTo(double latA, double lonA, double latB, double lonB);
358 //double GetHeadingFromTo(double latA, double lonA, double latB, double lonB);
360 // Given two positions (lat & lon in RADIANS), get the HORIZONTAL separation (in meters)
361 //double GetHorizontalSeparation(double lat1, double lon1, double lat2, double lon2);
363 // Proper great circle positional functions from The Aviation Formulary
364 // Returns distance in Nm, input in RADIANS.
365 double GetGreatCircleDistance(double lat1, double lon1, double lat2, double lon2) const;
367 // Input in RADIANS, output in DEGREES.
369 double GetGreatCircleCourse(double lat1, double lon1, double lat2, double lon2) const;
371 // Return a position on a radial from wp1 given distance d (nm) and magnetic heading h (degrees)
372 // Note that d should be less that 1/4 Earth diameter!
373 GPSWaypoint GetPositionOnMagRadial(const GPSWaypoint& wp1, double d, double h);
375 // Return a position on a radial from wp1 given distance d (nm) and TRUE heading h (degrees)
376 // Note that d should be less that 1/4 Earth diameter!
377 GPSWaypoint GetPositionOnRadial(const GPSWaypoint& wp1, double d, double h);
379 // Calculate the current cross-track deviation in nm.
380 // Returns zero if a sensible value cannot be calculated.
381 double CalcCrossTrackDeviation() const;
383 // Calculate the cross-track deviation between 2 arbitrary waypoints in nm.
384 // Returns zero if a sensible value cannot be calculated.
385 double CalcCrossTrackDeviation(const GPSWaypoint& wp1, const GPSWaypoint& wp2) const;
388 // GPS can have up to _maxFlightPlans flightplans stored, PLUS an active FP which may or my not be one of the stored ones.
389 // This is from KLN89, but is probably not far off the mark for most if not all GPS.
390 vector<GPSFlightPlan*> _flightPlans;
391 unsigned int _maxFlightPlans;
392 GPSFlightPlan* _activeFP;
394 // Modes of operation.
395 // This is currently somewhat Bendix-King specific, but probably applies fundamentally to other units as well
396 // Mode defaults to leg, but is OBS if _obsMode is true.
398 // _dto is set true for DTO operation
400 // In leg mode, we need to know if we are displaying a from and to waypoint, or just the to waypoint (eg. when OBS mode is cancelled).
402 // In OBS mode we need to know the set OBS heading
405 // Operational variables
406 GPSWaypoint _activeWaypoint;
407 GPSWaypoint _fromWaypoint;
409 float _crosstrackDist; // UNITS ??????????
410 double _eta; // ETA in SECONDS to active waypoint.
411 // Desired track for active leg, true and magnetic, in degrees
412 double _dtkTrue, _dtkMag;
413 bool _headingBugTo; // Set true when the heading bug is TO, false when FROM.
414 bool _waypointAlert; // Set true when waypoint alerting is happening. (This is a variable NOT a user-setting).
415 bool _departed; // Set when groundspeed first exceeds 30kts.
416 string _departureTimeString; // Ditto.
417 double _elapsedTime; // Elapsed time in seconds since departure
418 ClockTime _powerOnTime; // Time (hr:min) of unit power-up.
419 bool _powerOnTimerSet; // Indicates that we have set the above following power-up.
420 void SetPowerOnTimer();
422 void ResetPowerOnTimer();
423 // Set the alarm to go off at a given time.
424 inline void SetAlarm(int hr, int min) {
425 _alarmTime.set_hr(hr);
426 _alarmTime.set_min(min);
430 ClockTime _alarmTime;
433 // Configuration that affects flightplan operation
434 bool _turnAnticipationEnabled;
436 // Magvar stuff. Might get some of this stuff (such as time) from FG in future.
439 list<string> _messageStack;
441 virtual void CreateFlightPlan(GPSFlightPlan* fp, vector<string> ids, vector<GPSWpType> wps);
443 // Orientate the GPS unit to a flightplan - ie. figure out from current position
444 // and possibly orientation which leg of the FP we are on.
445 virtual void OrientateToFlightPlan(GPSFlightPlan* fp);
447 // Ditto for active fp. Probably all we need really!
448 virtual void OrientateToActiveFlightPlan();
450 int _cleanUpPage; // -1 => no cleanup required.
453 iap_map_type _np_iap; // Non-precision approaches
454 iap_map_type _pr_iap; // Precision approaches
455 bool _approachLoaded; // Set true when an approach is loaded in the active flightplan
456 bool _approachArm; // Set true when in approach-arm mode
457 bool _approachReallyArmed; // Apparently, approach-arm mode can be set from an external GPS-APR switch outside 30nm from airport,
458 // but the CDI scale change doesn't happen until 30nm from airport. Bizarre that it can be armed without
459 // the scale change, but it's in the manual...
460 bool _approachActive; // Set true when in approach-active mode
461 GPSFlightPlan* _approachFP; // Current approach - not necessarily loaded.
462 string _approachID; // ID of the airport we have an approach loaded for - bit of a hack that can hopefully be removed in future.
463 // More hackery since we aren't actually storing an approach class... Doh!
464 string _approachAbbrev;
465 string _approachRwyStr;
468 #endif // _DCLGPS_HXX