85a1e5cc98
Here's a new batch of AI code which includes a working radar instrument. I put the radar calculations into the existing AIAircraft class. It was easier that way, and it can always be migrated out later if we have to. Every tenth sim cycle the AIManager makes a copy of the current user state information. When the AIAircraft updates it uses this information to calculate the radar numbers. It calculates: 1) bearing from user to target 2) range to target in nautical miles 3) "horizontal offset" to target. This is the angle from the nose to the target, in degrees, from -180 to 180. This will be useful later for a HUD. 4) elevation, in degrees (vertical angle from user's position to target position) 5) vertical offset, in degrees (this is elevation corrected for user's pitch) 6) rdot (range rate in knots, note: not working yet, so I commented it out) and three items used by the radar instrument to place the "blip" 7) y_shift, in nautical miles 8) x_shift, in nautical miles 9) rotation, in degrees The radar instrument uses the above three items, and applies a scale factor to the x-shift and y-shift in order to match the instrument's scale. Changing the display scale can be done entirely in the XML code for the instrument. Right now it's set up only to display a 40 mile scale. The radar is an AWACS view, which is not very realistic, but it is useful and demonstrates the technology. With just a little more work I can get a HUD marker. All I need to do there is make a bank angle adjustment to the current values.
94 lines
2.5 KiB
C++
94 lines
2.5 KiB
C++
// FGAIAircraft - AIBase derived class creates an AI aircraft
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//
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// Written by David Culp, started October 2003.
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//
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// Copyright (C) 2003 David P. Culp - davidculp2@comcast.net
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License as
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// published by the Free Software Foundation; either version 2 of the
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// License, or (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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#ifndef _FG_AIAircraft_HXX
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#define _FG_AIAircraft_HXX
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#include "AIManager.hxx"
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#include "AIBase.hxx"
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#include <string>
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SG_USING_STD(string);
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class FGAIAircraft : public FGAIBase {
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private:
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typedef struct {
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double accel;
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double decel;
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double climb_rate;
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double descent_rate;
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double takeoff_speed;
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double climb_speed;
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double cruise_speed;
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double descent_speed;
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double land_speed;
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} PERF_STRUCT;
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public:
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enum aircraft_e {LIGHT=0, WW2_FIGHTER, JET_TRANSPORT, JET_FIGHTER};
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static const PERF_STRUCT settings[];
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FGAIAircraft(FGAIManager* mgr);
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~FGAIAircraft();
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bool init();
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virtual void bind();
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virtual void unbind();
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void update(double dt);
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void SetPerformance(const PERF_STRUCT *ps);
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void AccelTo(double speed);
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void PitchTo(double angle);
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void RollTo(double angle);
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void YawTo(double angle);
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void ClimbTo(double altitude);
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void TurnTo(double heading);
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protected:
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static FGAIAircraft *_self;
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private:
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bool hdg_lock;
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bool alt_lock;
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double dt;
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const PERF_STRUCT *performance;
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void Run(double dt);
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double sign(double x);
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static bool _getGearDown();
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};
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inline bool FGAIAircraft::_getGearDown() {
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return ((fgGetFloat("/position/altitude-agl-ft") < 150.0)
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&& (fgGetFloat("/orientation/pitch-deg") < 0.0)
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&& (fgGetFloat("/velocities/airspeed-kt")
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< _self->performance->land_speed*1.5));
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}
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#endif // _FG_AIAircraft_HXX
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