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
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.
25 #include <simgear/compiler.h>
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>
39 #include <Main/globals.hxx>
40 #include <Scenery/scenery.hxx>
44 #include "AIManager.hxx"
46 FGAIBase::FGAIBase() {
48 tgt_roll = roll = tgt_pitch = tgt_yaw = tgt_vs = vs = pitch = 0.0;
49 bearing = elevation = range = rdot = 0.0;
50 x_shift = y_shift = rotation = 0.0;
60 FGAIBase::~FGAIBase() {
61 globals->get_scenery()->get_scene_graph()->removeKid(aip.getSceneGraph());
63 SGPropertyNode *root = globals->get_props()->getNode("ai/models", true);
64 root->removeChild(_type_str.c_str(), index);
68 void FGAIBase::update(double dt) {
69 ft_per_deg_lat = 366468.96 - 3717.12 * cos(pos.lat()/SG_RADIANS_TO_DEGREES);
70 ft_per_deg_lon = 365228.16 * cos(pos.lat() / SG_RADIANS_TO_DEGREES);
74 void FGAIBase::Transform() {
76 aip.setPosition(pos.lon(), pos.lat(), pos.elev() * SG_METER_TO_FEET);
78 aip.setOrientation(0.0, pitch, hdg);
80 aip.setOrientation(roll, pitch, hdg);
82 aip.update( globals->get_scenery()->get_center() );
87 bool FGAIBase::init() {
89 SGPropertyNode *root = globals->get_props()->getNode("ai/models", true);
90 index = manager->getNum(_otype) - 1;
91 props = root->getNode(_type_str.c_str(), index, true);
92 if (model_path != "") {
93 model = sgLoad3DModel( globals->get_fg_root(),
96 globals->get_sim_time_sec() );
100 aip.setVisible(true);
102 globals->get_scenery()->get_scene_graph()->addKid(aip.getSceneGraph());
104 if (model_path != "") {
105 SG_LOG(SG_INPUT, SG_WARN, "AIBase: Could not load model.");
114 bool FGAIBase::isa( object_type otype ) {
115 if ( otype == _otype ) { return true; }
116 else { return false; }
120 void FGAIBase::bind() {
121 props->tie("id", SGRawValuePointer<int>(&id));
122 props->tie("velocities/true-airspeed-kt", SGRawValuePointer<double>(&speed));
123 props->tie("velocities/vertical-speed-fps",
124 SGRawValueMethods<FGAIBase,double>(*this,
125 &FGAIBase::_getVS_fps,
126 &FGAIBase::_setVS_fps));
128 props->tie("position/altitude-ft",
129 SGRawValueMethods<FGAIBase,double>(*this,
130 &FGAIBase::_getAltitude,
131 &FGAIBase::_setAltitude));
132 props->tie("position/latitude-deg",
133 SGRawValueMethods<FGAIBase,double>(*this,
134 &FGAIBase::_getLatitude,
135 &FGAIBase::_setLatitude));
136 props->tie("position/longitude-deg",
137 SGRawValueMethods<FGAIBase,double>(*this,
138 &FGAIBase::_getLongitude,
139 &FGAIBase::_setLongitude));
141 props->tie("orientation/pitch-deg", SGRawValuePointer<double>(&pitch));
142 props->tie("orientation/roll-deg", SGRawValuePointer<double>(&roll));
143 props->tie("orientation/true-heading-deg", SGRawValuePointer<double>(&hdg));
145 props->tie("radar/in-range", SGRawValuePointer<bool>(&in_range));
146 props->tie("radar/bearing-deg", SGRawValuePointer<double>(&bearing));
147 props->tie("radar/elevation-deg", SGRawValuePointer<double>(&elevation));
148 props->tie("radar/range-nm", SGRawValuePointer<double>(&range));
149 props->tie("radar/h-offset", SGRawValuePointer<double>(&horiz_offset));
150 props->tie("radar/v-offset", SGRawValuePointer<double>(&vert_offset));
151 props->tie("radar/x-shift", SGRawValuePointer<double>(&x_shift));
152 props->tie("radar/y-shift", SGRawValuePointer<double>(&y_shift));
153 props->tie("radar/rotation", SGRawValuePointer<double>(&rotation));
155 props->tie("controls/lighting/nav-lights",
156 SGRawValueFunctions<bool>(_isNight));
157 props->setBoolValue("controls/lighting/beacon", true);
158 props->setBoolValue("controls/lighting/strobe", true);
161 void FGAIBase::unbind() {
163 props->untie("velocities/true-airspeed-kt");
164 props->untie("velocities/vertical-speed-fps");
166 props->untie("position/altitude-ft");
167 props->untie("position/latitude-deg");
168 props->untie("position/longitude-deg");
170 props->untie("orientation/pitch-deg");
171 props->untie("orientation/roll-deg");
172 props->untie("orientation/true-heading-deg");
174 props->untie("radar/in-range");
175 props->untie("radar/bearing-deg");
176 props->untie("radar/elevation-deg");
177 props->untie("radar/range-nm");
178 props->untie("radar/h-offset");
179 props->untie("radar/v-offset");
180 props->untie("radar/x-shift");
181 props->untie("radar/y-shift");
182 props->untie("radar/rotation");
184 props->untie("controls/lighting/nav-lights");
187 double FGAIBase::UpdateRadar(FGAIManager* manager)
189 double radar_range_ft2 = fgGetDouble("/instrumentation/radar/range");
190 radar_range_ft2 *= SG_NM_TO_METER * SG_METER_TO_FEET * 1.1; // + 10%
191 radar_range_ft2 *= radar_range_ft2;
193 double user_latitude = manager->get_user_latitude();
194 double user_longitude = manager->get_user_longitude();
195 double lat_range = fabs(pos.lat() - user_latitude) * ft_per_deg_lat;
196 double lon_range = fabs(pos.lon() - user_longitude) * ft_per_deg_lon;
197 double range_ft2 = lat_range*lat_range + lon_range*lon_range;
200 // Test whether the target is within radar range.
202 in_range = (range_ft2 && (range_ft2 <= radar_range_ft2));
205 props->setBoolValue("radar/in-range", true);
207 // copy values from the AIManager
208 double user_altitude = manager->get_user_altitude();
209 double user_heading = manager->get_user_heading();
210 double user_pitch = manager->get_user_pitch();
211 double user_yaw = manager->get_user_yaw();
212 double user_speed = manager->get_user_speed();
214 // calculate range to target in feet and nautical miles
215 double range_ft = sqrt( range_ft2 );
216 range = range_ft / 6076.11549;
218 // calculate bearing to target
219 if (pos.lat() >= user_latitude) {
220 bearing = atan2(lat_range, lon_range) * SG_RADIANS_TO_DEGREES;
221 if (pos.lon() >= user_longitude) {
222 bearing = 90.0 - bearing;
224 bearing = 270.0 + bearing;
227 bearing = atan2(lon_range, lat_range) * SG_RADIANS_TO_DEGREES;
228 if (pos.lon() >= user_longitude) {
229 bearing = 180.0 - bearing;
231 bearing = 180.0 + bearing;
235 // calculate look left/right to target, without yaw correction
236 horiz_offset = bearing - user_heading;
237 if (horiz_offset > 180.0) horiz_offset -= 360.0;
238 if (horiz_offset < -180.0) horiz_offset += 360.0;
240 // calculate elevation to target
241 elevation = atan2( altitude * SG_METER_TO_FEET - user_altitude, range_ft )
242 * SG_RADIANS_TO_DEGREES;
244 // calculate look up/down to target
245 vert_offset = elevation + user_pitch;
247 /* this calculation needs to be fixed, but it isn't important anyway
248 // calculate range rate
249 double recip_bearing = bearing + 180.0;
250 if (recip_bearing > 360.0) recip_bearing -= 360.0;
251 double my_horiz_offset = recip_bearing - hdg;
252 if (my_horiz_offset > 180.0) my_horiz_offset -= 360.0;
253 if (my_horiz_offset < -180.0) my_horiz_offset += 360.0;
254 rdot = (-user_speed * cos( horiz_offset * SG_DEGREES_TO_RADIANS ))
255 +(-speed * 1.686 * cos( my_horiz_offset * SG_DEGREES_TO_RADIANS ));
258 // now correct look left/right for yaw
259 horiz_offset += user_yaw;
261 // calculate values for radar display
262 y_shift = range * cos( horiz_offset * SG_DEGREES_TO_RADIANS);
263 x_shift = range * sin( horiz_offset * SG_DEGREES_TO_RADIANS);
264 rotation = hdg - user_heading;
265 if (rotation < 0.0) rotation += 360.0;
274 * getters and Setters
276 void FGAIBase::_setLongitude( double longitude ) {
277 pos.setlon(longitude);
279 void FGAIBase::_setLatitude ( double latitude ) {
280 pos.setlat(latitude);
283 double FGAIBase::_getLongitude() const {
286 double FGAIBase::_getLatitude () const {
289 double FGAIBase::_getRdot() const {
292 double FGAIBase::_getVS_fps() const {
295 void FGAIBase::_setVS_fps( double _vs ) {
299 double FGAIBase::_getAltitude() const {
302 void FGAIBase::_setAltitude( double _alt ) {
306 bool FGAIBase::_isNight() {
307 return (fgGetFloat("/sim/time/sun-angle-rad") > 1.57);