C++ Ship::GetTargetPlanet方法代码示例

bool AI::MoveToPlanet(Ship &ship, Command &command)
{
	if(!ship.GetTargetPlanet())
		return false;
	
	const Point &target = ship.GetTargetPlanet()->Position();
	return MoveTo(ship, command, target, ship.GetTargetPlanet()->Radius(), 1.);
}

void AI::Refuel(Ship &ship, Command &command)
{
	if(ship.GetParent() && ship.GetParent()->GetTargetPlanet())
		ship.SetTargetPlanet(ship.GetParent()->GetTargetPlanet());
	else if(!ship.GetTargetPlanet())
	{
		double closest = numeric_limits<double>::infinity();
		for(const StellarObject &object : ship.GetSystem()->Objects())
			if(object.GetPlanet() && object.GetPlanet()->HasSpaceport())
			{
				double distance = ship.Position().Distance(object.Position());
				if(distance < closest)
				{
					ship.SetTargetPlanet(&object);
					closest = distance;
				}
			}
	}
	if(ship.GetTargetPlanet())
	{
		MoveToPlanet(ship, command);
		command |= Command::LAND;
	}
}

void AI::DoSurveillance(Ship &ship, Command &command, const list<shared_ptr<Ship>> &ships) const
{
	const shared_ptr<Ship> &target = ship.GetTargetShip();
	if(target && (!target->IsTargetable() || target->GetSystem() != ship.GetSystem()))
		ship.SetTargetShip(shared_ptr<Ship>());
	if(target && ship.GetGovernment()->IsEnemy(target->GetGovernment()))
	{
		MoveIndependent(ship, command);
		command |= AutoFire(ship, ships);
		return;
	}
	
	bool cargoScan = ship.Attributes().Get("cargo scan");
	bool outfitScan = ship.Attributes().Get("outfit scan");
	double atmosphereScan = ship.Attributes().Get("atmosphere scan");
	bool jumpDrive = ship.Attributes().Get("jump drive");
	bool hyperdrive = ship.Attributes().Get("hyperdrive");
	
	// This function is only called for ships that are in the player's system.
	if(ship.GetTargetSystem())
	{
		PrepareForHyperspace(ship, command);
		command |= Command::JUMP;
		command |= Command::DEPLOY;
	}
	else if(ship.GetTargetPlanet())
	{
		MoveToPlanet(ship, command);
		double distance = ship.Position().Distance(ship.GetTargetPlanet()->Position());
		if(distance < atmosphereScan && !Random::Int(100))
			ship.SetTargetPlanet(nullptr);
		else
			command |= Command::LAND;
	}
	else if(ship.GetTargetShip() && ship.GetTargetShip()->IsTargetable()
			&& ship.GetTargetShip()->GetSystem() == ship.GetSystem())
	{
		bool mustScanCargo = cargoScan && !Has(ship, target, ShipEvent::SCAN_CARGO);
		bool mustScanOutfits = outfitScan && !Has(ship, target, ShipEvent::SCAN_OUTFITS);
		bool isInSystem = (ship.GetSystem() == target->GetSystem() && !target->IsEnteringHyperspace());
		if(!isInSystem || (!mustScanCargo && !mustScanOutfits))
			ship.SetTargetShip(shared_ptr<Ship>());
		else
		{
			CircleAround(ship, command, *target);
			command |= Command::SCAN;
		}
	}
	else
	{
		shared_ptr<Ship> newTarget = FindTarget(ship, ships);
		if(newTarget && ship.GetGovernment()->IsEnemy(newTarget->GetGovernment()))
		{
			ship.SetTargetShip(newTarget);
			return;
		}
		
		vector<shared_ptr<Ship>> targetShips;
		vector<const StellarObject *> targetPlanets;
		vector<const System *> targetSystems;
		
		if(cargoScan || outfitScan)
			for(const auto &it : ships)
				if(it->GetGovernment() != ship.GetGovernment() && it->IsTargetable()
						&& it->GetSystem() == ship.GetSystem())
				{
					if(Has(ship, it, ShipEvent::SCAN_CARGO) && Has(ship, it, ShipEvent::SCAN_OUTFITS))
						continue;
				
					targetShips.push_back(it);
				}
		
		if(atmosphereScan)
			for(const StellarObject &object : ship.GetSystem()->Objects())
				if(!object.IsStar() && object.Radius() < 130.)
					targetPlanets.push_back(&object);
		
		if(jumpDrive)
			for(const System *link : ship.GetSystem()->Neighbors())
				targetSystems.push_back(link);
		else if(hyperdrive)
			for(const System *link : ship.GetSystem()->Links())
				targetSystems.push_back(link);
		
		unsigned total = targetShips.size() + targetPlanets.size() + targetSystems.size();
		if(!total)
			return;
		
		unsigned index = Random::Int(total);
		if(index < targetShips.size())
			ship.SetTargetShip(targetShips[index]);
		else
		{
			index -= targetShips.size();
			if(index < targetPlanets.size())
				ship.SetTargetPlanet(targetPlanets[index]);
			else
				ship.SetTargetSystem(targetSystems[index - targetPlanets.size()]);
		}
	}
//.........这里部分代码省略.........

void AI::MoveIndependent(Ship &ship, Command &command) const
{
	if(ship.Position().Length() >= 10000.)
	{
		MoveTo(ship, command, Point(), 40., .8);
		return;
	}
	shared_ptr<const Ship> target = ship.GetTargetShip();
	if(target && (ship.GetGovernment()->IsEnemy(target->GetGovernment())
			|| (ship.IsYours() && target == sharedTarget.lock())))
	{
		bool shouldBoard = ship.Cargo().Free() && ship.GetPersonality().Plunders();
		bool hasBoarded = Has(ship, target, ShipEvent::BOARD);
		if(shouldBoard && target->IsDisabled() && !hasBoarded)
		{
			if(ship.IsBoarding())
				return;
			MoveTo(ship, command, target->Position(), 40., .8);
			command |= Command::BOARD;
		}
		else
			Attack(ship, command, *target);
		return;
	}
	else if(target)
	{
		bool cargoScan = ship.Attributes().Get("cargo scan");
		bool outfitScan = ship.Attributes().Get("outfit scan");
		if((!cargoScan || Has(ship, target, ShipEvent::SCAN_CARGO))
				&& (!outfitScan || Has(ship, target, ShipEvent::SCAN_OUTFITS)))
			target.reset();
		else
		{
			CircleAround(ship, command, *target);
			if(!ship.GetGovernment()->IsPlayer())
				command |= Command::SCAN;
		}
		return;
	}
	
	// If this ship is moving independently because it has a target, not because
	// it has no parent, don't let it make travel plans.
	if(ship.GetParent() && !ship.GetPersonality().IsStaying())
		return;
	
	if(!ship.GetTargetSystem() && !ship.GetTargetPlanet() && !ship.GetPersonality().IsStaying())
	{
		int jumps = ship.JumpsRemaining();
		// Each destination system has an average priority of 10.
		// If you only have one jump left, landing should be high priority.
		int planetWeight = jumps ? (1 + 40 / jumps) : 1;
		
		vector<int> systemWeights;
		int totalWeight = 0;
		const vector<const System *> &links = ship.Attributes().Get("jump drive")
			? ship.GetSystem()->Neighbors() : ship.GetSystem()->Links();
		if(jumps)
		{
			for(const System *link : links)
			{
				// Prefer systems in the direction we're facing.
				Point direction = link->Position() - ship.GetSystem()->Position();
				int weight = static_cast<int>(
					11. + 10. * ship.Facing().Unit().Dot(direction.Unit()));
				
				systemWeights.push_back(weight);
				totalWeight += weight;
			}
		}
		int systemTotalWeight = totalWeight;
		
		// Anywhere you can land that has a port has the same weight. Ships will
		// not land anywhere without a port.
		vector<const StellarObject *> planets;
		for(const StellarObject &object : ship.GetSystem()->Objects())
			if(object.GetPlanet() && object.GetPlanet()->HasSpaceport()
					&& object.GetPlanet()->CanLand(ship))
			{
				planets.push_back(&object);
				totalWeight += planetWeight;
			}
		if(!totalWeight)
			return;
		
		int choice = Random::Int(totalWeight);
		if(choice < systemTotalWeight)
		{
			for(unsigned i = 0; i < systemWeights.size(); ++i)
			{
				choice -= systemWeights[i];
				if(choice < 0)
				{
					ship.SetTargetSystem(links[i]);
					break;
				}
			}
		}
		else
		{
			choice = (choice - systemTotalWeight) / planetWeight;
//.........这里部分代码省略.........

//.........这里部分代码省略.........
		{
			double closest = numeric_limits<double>::infinity();
			bool foundEnemy = false;
			bool foundAnything = false;
			for(const shared_ptr<Ship> &other : ships)
				if(other->IsTargetable() && other->IsDisabled() && !other->IsDestroyed())
				{
					bool isEnemy = other->GetGovernment()->IsEnemy(ship.GetGovernment());
					double d = other->Position().Distance(ship.Position());
					if((isEnemy && !foundEnemy) || d < closest)
					{
						closest = d;
						foundEnemy = isEnemy;
						foundAnything = true;
						ship.SetTargetShip(other);
					}
				}
			if(!foundAnything)
				keyDown.Clear(Command::BOARD);
		}
	}
	else if(keyDown.Has(Command::LAND))
	{
		// If the player is right over an uninhabited planet, display a message
		// explaining why they cannot land there.
		string message;
		for(const StellarObject &object : ship.GetSystem()->Objects())
			if(!object.GetPlanet() && !object.GetSprite().IsEmpty())
			{
				double distance = ship.Position().Distance(object.Position());
				if(distance < object.Radius())
					message = object.LandingMessage();
			}
		const StellarObject *target = ship.GetTargetPlanet();
		if(target && ship.Position().Distance(target->Position()) < target->Radius())
		{
			// Special case: if there are two planets in system and you have one
			// selected, then press "land" again, do not toggle to the other if
			// you are within landing range of the one you have selected.
		}
		else if(message.empty() && target)
		{
			bool found = false;
			const StellarObject *next = nullptr;
			for(const StellarObject &object : ship.GetSystem()->Objects())
				if(object.GetPlanet())
				{
					if(found)
					{
						next = &object;
						break;
					}
					else if(&object == ship.GetTargetPlanet())
						found = true;
				}
			if(!next)
			{
				for(const StellarObject &object : ship.GetSystem()->Objects())
					if(object.GetPlanet())
					{
						next = &object;
						break;
					}
			}
			ship.SetTargetPlanet(next);
			if(next->GetPlanet() && !next->GetPlanet()->CanLand())