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1 // FGAIBase - abstract base class for AI objects
2 // Written by David Culp, started Nov 2003, based on
3 // David Luff's FGAIEntity class.
4 // - davidculp2@comcast.net
5 //
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.
10 //
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.
15 //
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.
19
20
21 #ifdef HAVE_CONFIG_H
22 #  include <config.h>
23 #endif
24
25 #include <simgear/compiler.h>
26
27 #include STL_STRING
28
29 #include <plib/sg.h>
30 #include <plib/ssg.h>
31
32 #include <simgear/math/point3d.hxx>
33 #include <simgear/misc/sg_path.hxx>
34 #include <simgear/scene/model/location.hxx>
35 #include <simgear/scene/model/model.hxx>
36 #include <simgear/debug/logstream.hxx>
37 #include <simgear/props/props.hxx>
38
39 #include <Main/globals.hxx>
40 #include <Scenery/scenery.hxx>
41
42
43 #include "AIBase.hxx"
44 #include "AIManager.hxx"
45
46
47 const double FGAIBase::rho = 0.023780;  // sea level air density slugs/ft3
48 const double FGAIBase::lbs_to_slugs = 0.031080950172;   //conversion factor
49
50
51 FGAIBase::FGAIBase()
52  :  fp( NULL ),
53     model( NULL ),
54     props( NULL ),
55     manager( NULL )
56 {
57     _type_str = "model";
58     tgt_roll = roll = tgt_pitch = tgt_yaw = tgt_vs = vs = pitch = 0.0;
59     bearing = elevation = range = rdot = 0.0;
60     x_shift = y_shift = rotation = 0.0;
61     in_range = false;
62     invisible = true;
63     no_roll = true;
64     life = 900;
65     model_path = "";
66     _otype = otNull;
67     index = 0;
68     delete_me = false;
69 }
70
71 FGAIBase::~FGAIBase() {
72     globals->get_scenery()->get_scene_graph()->removeKid(aip.getSceneGraph());
73     // unbind();
74     SGPropertyNode *root = globals->get_props()->getNode("ai/models", true);
75     root->removeChild(_type_str.c_str(), index);
76     if (fp) delete fp;
77     fp = NULL;
78 }
79
80 void FGAIBase::update(double dt) {
81     ft_per_deg_lat = 366468.96 - 3717.12 * cos(pos.lat()/SG_RADIANS_TO_DEGREES);
82     ft_per_deg_lon = 365228.16 * cos(pos.lat() / SG_RADIANS_TO_DEGREES);
83 }
84
85
86 void FGAIBase::Transform() {
87     if (!invisible) {
88       aip.setPosition(pos.lon(), pos.lat(), pos.elev() * SG_METER_TO_FEET);
89       if (no_roll) {
90          aip.setOrientation(0.0, pitch, hdg);
91       } else {
92          aip.setOrientation(roll, pitch, hdg);
93       }
94       aip.update( globals->get_scenery()->get_center() );    
95     }
96 }
97
98
99 bool FGAIBase::init() {
100
101    SGPropertyNode *root = globals->get_props()->getNode("ai/models", true);
102
103    index = manager->getNum(_otype) - 1;
104    props = root->getNode(_type_str.c_str(), index, true);
105
106    if (model_path != "") {
107       model = sgLoad3DModel( globals->get_fg_root(),
108                              model_path.c_str(),
109                              props,
110                              globals->get_sim_time_sec() );
111    }
112    if (model) {
113      aip.init( model );
114      aip.setVisible(true);
115      invisible = false;
116      globals->get_scenery()->get_scene_graph()->addKid(aip.getSceneGraph());
117    } else {
118      if (model_path != "") { 
119        SG_LOG(SG_INPUT, SG_WARN, "AIBase: Could not load model.");
120      }
121    } 
122
123    setDie(false);
124
125    return true;
126 }
127
128 bool FGAIBase::isa( object_type otype ) {
129  if ( otype == _otype ) { return true; }
130  else { return false; } 
131 }
132
133
134 void FGAIBase::bind() {
135    props->tie("id", SGRawValueMethods<FGAIBase,int>(*this,
136                                          &FGAIBase::_getID));
137    props->tie("velocities/true-airspeed-kt",  SGRawValuePointer<double>(&speed));
138    props->tie("velocities/vertical-speed-fps",
139                SGRawValueMethods<FGAIBase,double>(*this,
140                                          &FGAIBase::_getVS_fps,
141                                          &FGAIBase::_setVS_fps));
142
143    props->tie("position/altitude-ft",
144                SGRawValueMethods<FGAIBase,double>(*this,
145                                          &FGAIBase::_getAltitude,
146                                          &FGAIBase::_setAltitude));
147    props->tie("position/latitude-deg",
148                SGRawValueMethods<FGAIBase,double>(*this,
149                                          &FGAIBase::_getLatitude,
150                                          &FGAIBase::_setLatitude));
151    props->tie("position/longitude-deg",
152                SGRawValueMethods<FGAIBase,double>(*this,
153                                          &FGAIBase::_getLongitude,
154                                          &FGAIBase::_setLongitude));
155
156    props->tie("orientation/pitch-deg",   SGRawValuePointer<double>(&pitch));
157    props->tie("orientation/roll-deg",    SGRawValuePointer<double>(&roll));
158    props->tie("orientation/true-heading-deg", SGRawValuePointer<double>(&hdg));
159
160    props->tie("radar/in-range", SGRawValuePointer<bool>(&in_range));
161    props->tie("radar/bearing-deg",   SGRawValuePointer<double>(&bearing));
162    props->tie("radar/elevation-deg", SGRawValuePointer<double>(&elevation));
163    props->tie("radar/range-nm", SGRawValuePointer<double>(&range));
164    props->tie("radar/h-offset", SGRawValuePointer<double>(&horiz_offset));
165    props->tie("radar/v-offset", SGRawValuePointer<double>(&vert_offset)); 
166    props->tie("radar/x-shift", SGRawValuePointer<double>(&x_shift));
167    props->tie("radar/y-shift", SGRawValuePointer<double>(&y_shift));
168    props->tie("radar/rotation", SGRawValuePointer<double>(&rotation));
169
170    props->tie("controls/lighting/nav-lights",
171                SGRawValueFunctions<bool>(_isNight));
172    props->setBoolValue("controls/lighting/beacon", true);
173    props->setBoolValue("controls/lighting/strobe", true);
174 }
175
176 void FGAIBase::unbind() {
177     props->untie("id");
178     props->untie("velocities/true-airspeed-kt");
179     props->untie("velocities/vertical-speed-fps");
180
181     props->untie("position/altitude-ft");
182     props->untie("position/latitude-deg");
183     props->untie("position/longitude-deg");
184
185     props->untie("orientation/pitch-deg");
186     props->untie("orientation/roll-deg");
187     props->untie("orientation/true-heading-deg");
188
189     props->untie("radar/in-range");
190     props->untie("radar/bearing-deg");
191     props->untie("radar/elevation-deg");
192     props->untie("radar/range-nm");
193     props->untie("radar/h-offset");
194     props->untie("radar/v-offset");
195     props->untie("radar/x-shift");
196     props->untie("radar/y-shift");
197     props->untie("radar/rotation");
198
199     props->untie("controls/lighting/nav-lights");
200 }
201
202 double FGAIBase::UpdateRadar(FGAIManager* manager)
203 {
204    double radar_range_ft2 = fgGetDouble("/instrumentation/radar/range");
205    radar_range_ft2 *= SG_NM_TO_METER * SG_METER_TO_FEET * 1.1; // + 10%
206    radar_range_ft2 *= radar_range_ft2;
207
208    double user_latitude  = manager->get_user_latitude();
209    double user_longitude = manager->get_user_longitude();
210    double lat_range = fabs(pos.lat() - user_latitude) * ft_per_deg_lat;
211    double lon_range = fabs(pos.lon() - user_longitude) * ft_per_deg_lon;
212    double range_ft2 = lat_range*lat_range + lon_range*lon_range;
213
214    //
215    // Test whether the target is within radar range.
216    //
217    in_range = (range_ft2 && (range_ft2 <= radar_range_ft2));
218    if ( in_range )
219    {
220      props->setBoolValue("radar/in-range", true);
221
222      // copy values from the AIManager
223      double user_altitude  = manager->get_user_altitude();
224      double user_heading   = manager->get_user_heading();
225      double user_pitch     = manager->get_user_pitch();
226      double user_yaw       = manager->get_user_yaw();
227      double user_speed     = manager->get_user_speed();
228
229      // calculate range to target in feet and nautical miles
230      double range_ft = sqrt( range_ft2 );
231      range = range_ft / 6076.11549;
232
233      // calculate bearing to target
234      if (pos.lat() >= user_latitude) {
235         bearing = atan2(lat_range, lon_range) * SG_RADIANS_TO_DEGREES;
236         if (pos.lon() >= user_longitude) {
237            bearing = 90.0 - bearing;
238         } else {
239            bearing = 270.0 + bearing;
240         }
241      } else {
242         bearing = atan2(lon_range, lat_range) * SG_RADIANS_TO_DEGREES;
243         if (pos.lon() >= user_longitude) {
244            bearing = 180.0 - bearing;
245         } else {
246            bearing = 180.0 + bearing;
247         }
248      }
249
250      // calculate look left/right to target, without yaw correction
251      horiz_offset = bearing - user_heading;
252      if (horiz_offset > 180.0) horiz_offset -= 360.0;
253      if (horiz_offset < -180.0) horiz_offset += 360.0;
254
255      // calculate elevation to target
256      elevation = atan2( altitude * SG_METER_TO_FEET - user_altitude, range_ft )
257                         * SG_RADIANS_TO_DEGREES;
258
259      // calculate look up/down to target
260      vert_offset = elevation + user_pitch;
261
262      /* this calculation needs to be fixed, but it isn't important anyway
263      // calculate range rate
264      double recip_bearing = bearing + 180.0;
265      if (recip_bearing > 360.0) recip_bearing -= 360.0;
266      double my_horiz_offset = recip_bearing - hdg;
267      if (my_horiz_offset > 180.0) my_horiz_offset -= 360.0;
268      if (my_horiz_offset < -180.0) my_horiz_offset += 360.0;
269      rdot = (-user_speed * cos( horiz_offset * SG_DEGREES_TO_RADIANS ))
270              +(-speed * 1.686 * cos( my_horiz_offset * SG_DEGREES_TO_RADIANS ));
271 */
272
273      // now correct look left/right for yaw
274      horiz_offset += user_yaw;
275
276      // calculate values for radar display
277      y_shift = range * cos( horiz_offset * SG_DEGREES_TO_RADIANS);
278      x_shift = range * sin( horiz_offset * SG_DEGREES_TO_RADIANS);
279      rotation = hdg - user_heading;
280      if (rotation < 0.0) rotation += 360.0;
281
282    }
283
284    return range_ft2;
285 }
286
287
288 /*
289  * getters and Setters
290  */
291 void FGAIBase::_setLongitude( double longitude ) {
292     pos.setlon(longitude);
293 }
294 void FGAIBase::_setLatitude ( double latitude )  {
295     pos.setlat(latitude);
296 }
297
298 double FGAIBase::_getLongitude() const {
299     return pos.lon();
300 }
301 double FGAIBase::_getLatitude () const {
302     return pos.lat();
303 }
304 double FGAIBase::_getRdot() const {
305     return rdot;
306 }
307 double FGAIBase::_getVS_fps() const {
308     return vs*60.0;
309 }
310 void FGAIBase::_setVS_fps( double _vs ) {
311     vs = _vs/60.0;
312 }
313
314 double FGAIBase::_getAltitude() const {
315     return altitude;
316 }
317 void FGAIBase::_setAltitude( double _alt ) {
318     setAltitude( _alt );
319 }
320
321 bool FGAIBase::_isNight() {
322     return (fgGetFloat("/sim/time/sun-angle-rad") > 1.57);
323 }
324
325 int FGAIBase::_getID() const {
326     return (int)(this);
327 }