DropShipAI.cpp

Go to the documentation of this file.

/*  Project Starshatter 4.5
        Destroyer Studios LLC
        Copyright © 1997-2004. All Rights Reserved.

        SUBSYSTEM:    Stars.exe
        FILE:         DropShipAI.cpp
        AUTHOR:       John DiCamillo


        OVERVIEW
        ========
        Drop Ship (orbit/surface and surface/orbit) AI class
*/

#include "MemDebug.h"
#include "DropShipAI.h"
#include "TacticalAI.h"
#include "Ship.h"
#include "ShipCtrl.h"
#include "Drive.h"
#include "Sim.h"
#include "StarSystem.h"
#include "KeyMap.h"

#include "Game.h"

// +----------------------------------------------------------------------+

DropShipAI::DropShipAI(Ship* s)
: ShipAI(s)
{
        seek_gain = 20;
        seek_damp = 0.5;

        delete tactical;
        tactical = 0;
}

DropShipAI::~DropShipAI()
{
}

// +--------------------------------------------------------------------+

void
DropShipAI::FindObjective()
{
        distance = 0;

        if (!ship)  return;

        Sim*        sim = Sim::GetSim();
        SimRegion*  self_rgn = ship->GetRegion();

        // if making orbit, go up:
        if (self_rgn->Type() == Sim::AIR_SPACE) {
                obj_w = self->Location() + Point(0, 1e3, 0);
        }

        // if breaking orbit, head for terrain region:
        else {
                SimRegion* dst_rgn = sim->FindNearestTerrainRegion(ship);
                Point      dst     = dst_rgn->GetOrbitalRegion()->Location() -
                self_rgn->GetOrbitalRegion()->Location() +
                Point(0, 0, -1e6);
                
                obj_w =    dst.OtherHand();
        }

        // distance from self to navpt:
        distance = Point(obj_w - self->Location()).length();

        // transform into camera coords:
        objective = Transform(obj_w);
        objective.Normalize();
}

// +--------------------------------------------------------------------+

void
DropShipAI::Navigator()
{
        accumulator.Clear();
        magnitude = 0;

        if (other)
        ship->SetFLCSMode(Ship::FLCS_AUTO);
        else
        ship->SetFLCSMode(Ship::FLCS_MANUAL);

        Accumulate(AvoidCollision());
        Accumulate(Seek(objective));

        // are we being asked to flee?
        if (fabs(accumulator.yaw) == 1.0 && accumulator.pitch == 0.0) {
                accumulator.pitch  = -0.7f;
                accumulator.yaw   *= 0.25f;
        }

        self->ApplyRoll((float) (accumulator.yaw * -0.4));
        self->ApplyYaw((float) (accumulator.yaw * 0.2));

        if (fabs(accumulator.yaw) > 0.5 && fabs(accumulator.pitch) < 0.1)
        accumulator.pitch -= 0.1f;

        if (accumulator.pitch != 0)
        self->ApplyPitch((float) accumulator.pitch);

        // if not turning, roll to orient with world coords:
        if (fabs(accumulator.yaw) < 0.1) {
                Point vrt = ((Camera*) &(self->Cam()))->vrt();
                double deflection = vrt.y;
                if (deflection != 0) {
                        double theta = asin(deflection/vrt.length());
                        self->ApplyRoll(-theta);
                }
        }

        ship->SetThrottle(100);
        ship->ExecFLCSFrame();
}