// Fire this weapon. If it is a turret, it automatically points toward
// the given ship's target. If the weapon requires ammunition, it will
// be subtracted from the given ship.
void Armament::Weapon::Fire(Ship &ship, list<Projectile> &projectiles, list<Effect> &effects)
{
// Since this is only called internally by Armament (no one else has non-
// const access), assume Armament checked that this is a valid call.
Angle aim = ship.Facing();
// Get projectiles to start at the right position. They are drawn at an
// offset of (.5 * velocity) and that velocity includes the velocity of the
// ship that fired them.
Point start = ship.Position() + aim.Rotate(point) - .5 * ship.Velocity();
shared_ptr<const Ship> target = ship.GetTargetShip();
// If you are boarding your target, do not fire on it.
if(ship.IsBoarding() || ship.Commands().Has(Command::BOARD))
target.reset();
if(!isTurret || !target || target->GetSystem() != ship.GetSystem())
aim += angle;
else
{
Point p = target->Position() - start + ship.GetPersonality().Confusion();
Point v = target->Velocity() - ship.Velocity();
double steps = RendezvousTime(p, v, outfit->Velocity());
// Special case: RendezvousTime() may return NaN. But in that case, this
// comparison will return false.
if(!(steps < outfit->TotalLifetime()))
steps = outfit->TotalLifetime();
p += steps * v;
aim = Angle(TO_DEG * atan2(p.X(), -p.Y()));
}
projectiles.emplace_back(ship, start, aim, outfit);
if(outfit->WeaponSound())
Audio::Play(outfit->WeaponSound(), start);
double force = outfit->FiringForce();
if(force)
ship.ApplyForce(aim.Unit() * -force);
for(const auto &eit : outfit->FireEffects())
for(int i = 0; i < eit.second; ++i)
{
effects.push_back(*eit.first);
effects.back().Place(start, ship.Velocity(), aim);
}
Fire(ship);
}
Projectile::Projectile(const Ship &parent, Point position, Angle angle, const Outfit *weapon)
: weapon(weapon), animation(weapon->WeaponSprite()),
position(position), velocity(parent.Velocity()), angle(angle),
targetShip(parent.GetTargetShip()), government(parent.GetGovernment()),
lifetime(weapon->Lifetime())
{
// If you are boarding your target, do not fire on it.
if(parent.IsBoarding() || parent.Commands().Has(Command::BOARD))
targetShip.reset();
cachedTarget = targetShip.lock().get();
double inaccuracy = weapon->Inaccuracy();
if(inaccuracy)
this->angle += Angle::Random(inaccuracy) - Angle::Random(inaccuracy);
velocity += this->angle.Unit() * weapon->Velocity();
}
Projectile::Projectile(const Ship &parent, Point position, Angle angle, const Outfit *weapon)
: Body(weapon->WeaponSprite(), position, parent.Velocity(), angle),
weapon(weapon), targetShip(parent.GetTargetShip()), lifetime(weapon->Lifetime())
{
government = parent.GetGovernment();
// If you are boarding your target, do not fire on it.
if(parent.IsBoarding() || parent.Commands().Has(Command::BOARD))
targetShip.reset();
cachedTarget = targetShip.lock().get();
if(cachedTarget)
targetGovernment = cachedTarget->GetGovernment();
double inaccuracy = weapon->Inaccuracy();
if(inaccuracy)
this->angle += Angle::Random(inaccuracy) - Angle::Random(inaccuracy);
velocity += this->angle.Unit() * (weapon->Velocity() + Random::Real() * weapon->RandomVelocity());
// If a random lifetime is specified, add a random amount up to that amount.
if(weapon->RandomLifetime())
lifetime += Random::Int(weapon->RandomLifetime() + 1);
}
