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319 lines (233 loc) · 8.39 KB
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/* Hardpoint.cpp
Copyright (c) 2016 by Michael Zahniser
Endless Sky is free software: you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the Free Software
Foundation, either version 3 of the License, or (at your option) any later version.
Endless Sky is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
PARTICULAR PURPOSE. See the GNU General Public License for more details.
*/
#include "Hardpoint.h"
#include "Audio.h"
#include "Effect.h"
#include "Outfit.h"
#include "pi.h"
#include "Projectile.h"
#include "Random.h"
#include "Ship.h"
#include "Visual.h"
#include <cmath>
#include <map>
using namespace std;
namespace {
// Create all the effects in the given list, at the given location, velocity, and angle.
void CreateEffects(const map<const Effect *, int> &m, Point pos, Point vel, Angle angle, vector<Visual> &visuals)
{
for(const auto &it : m)
for(int i = 0; i < it.second; ++i)
visuals.emplace_back(*it.first, pos, vel, angle);
}
}
// Constructor.
Hardpoint::Hardpoint(const Point &point, bool isTurret, const Outfit *outfit)
: outfit(outfit), point(point * .5), isTurret(isTurret)
{
}
// Get the weapon in this hardpoint. This returns null if there is none.
const Outfit *Hardpoint::GetOutfit() const
{
return outfit;
}
// Get the location, relative to the center of the ship, from which
// projectiles of this weapon should originate.
const Point &Hardpoint::GetPoint() const
{
return point;
}
// Get the convergence angle adjustment of this weapon (guns only, not turrets).
const Angle &Hardpoint::GetAngle() const
{
return angle;
}
// Get the angle this weapon ought to point at for ideal gun harmonization.
Angle Hardpoint::HarmonizedAngle() const
{
if(!outfit)
return Angle();
// Find the point of convergence of shots fired from this gun. That is,
// find the angle where the projectile's X offset will be zero when it
// reaches the very end of its range.
double d = outfit->Range();
// Projectiles with a range of zero should fire straight forward. A
// special check is needed to avoid divide by zero errors.
return Angle(d <= 0. ? 0. : -asin(point.X() / d) * TO_DEG);
}
// Find out if this is a turret hardpoint (whether or not it has a turret installed).
bool Hardpoint::IsTurret() const
{
return isTurret;
}
// Find out if this hardpoint has a homing weapon installed.
bool Hardpoint::IsHoming() const
{
return outfit && outfit->Homing();
}
// Find out if this hardpoint has an anti-missile installed.
bool Hardpoint::IsAntiMissile() const
{
return outfit && outfit->AntiMissile() > 0;
}
bool Hardpoint::CanAim() const
{
return outfit && outfit->TurretTurn();
}
// Check if this weapon is ready to fire.
bool Hardpoint::IsReady() const
{
return outfit && burstReload <= 0. && burstCount;
}
// Check if this weapon fired the last time it was able to fire. This is to
// figure out if the stream spacing timer should be applied or not.
bool Hardpoint::WasFiring() const
{
return wasFiring;
}
// Get the number of remaining burst shots before a full reload is required.
int Hardpoint::BurstRemaining() const
{
return burstCount;
}
// Perform one step (i.e. decrement the reload count).
void Hardpoint::Step()
{
if(!outfit)
return;
wasFiring = isFiring;
if(reload > 0.)
--reload;
// If the full reload time is elapsed, reset the burst counter.
if(reload <= 0.)
burstCount = outfit->BurstCount();
if(burstReload > 0.)
--burstReload;
// If the burst reload time has elapsed, this weapon will not count as firing
// continuously if it is not fired this frame.
if(burstReload <= 0.)
isFiring = false;
}
// Adjust this weapon's aim by the given amount, relative to its maximum
// "turret turn" rate.
void Hardpoint::Aim(double amount)
{
if(!outfit)
return;
angle += outfit->TurretTurn() * amount;
}
// 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 Hardpoint::Fire(Ship &ship, vector<Projectile> &projectiles, vector<Visual> &visuals)
{
// 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();
// Apply the aim and hardpoint offset.
aim += angle;
start += aim.Rotate(outfit->HardpointOffset());
// Create a new projectile, originating from this hardpoint.
projectiles.emplace_back(ship, start, aim, outfit);
// Create any effects this weapon creates when it is fired.
CreateEffects(outfit->FireEffects(), start, ship.Velocity(), aim, visuals);
// Update the reload and burst counters, and expend ammunition if applicable.
Fire(ship, start, aim);
}
// Fire an anti-missile. Returns true if the missile should be killed.
bool Hardpoint::FireAntiMissile(Ship &ship, const Projectile &projectile, vector<Visual> &visuals)
{
// Make sure this hardpoint really is an anti-missile.
int strength = outfit->AntiMissile();
if(!strength)
return false;
// Get the anti-missile range. Anti-missile shots always last a single frame,
// so their range is equal to their velocity.
double range = outfit->Velocity();
// Check if the missile is within range of this hardpoint.
Point start = ship.Position() + ship.Facing().Rotate(point);
Point offset = projectile.Position() - start;
if(offset.Length() > range)
return false;
// Firing effects are displayed at the anti-missile hardpoint that just fired.
Angle aim(offset);
angle = aim - ship.Facing();
start += aim.Rotate(outfit->HardpointOffset());
CreateEffects(outfit->FireEffects(), start, ship.Velocity(), aim, visuals);
// Figure out where the effect should be placed. Anti-missiles do not create
// projectiles; they just create a blast animation.
CreateEffects(outfit->HitEffects(), start + (.5 * range) * aim.Unit(), ship.Velocity(), aim, visuals);
// Die effects are displayed at the projectile, whether or not it actually "dies."
CreateEffects(outfit->DieEffects(), projectile.Position(), projectile.Velocity(), aim, visuals);
// Update the reload and burst counters, and expend ammunition if applicable.
Fire(ship, start, aim);
// Check whether the missile was destroyed.
return (Random::Int(strength) > Random::Int(projectile.MissileStrength()));
}
// Install a weapon here (assuming it is empty). This is only for
// Armament to call internally.
void Hardpoint::Install(const Outfit *outfit)
{
// If the given outfit is not a valid weapon, this hardpoint becomes empty.
// Also check that the type of the weapon (gun or turret) is right.
if(!outfit || !outfit->IsWeapon() || (isTurret == !outfit->Get("turret mounts")))
Uninstall();
else
{
// Reset all the reload counters.
this->outfit = outfit;
Reload();
// For fixed weapons, apply "gun harmonization," pointing them slightly
// inward so the projectiles will converge. For turrets, start them out
// pointing outward from the center of the ship.
if(!isTurret)
angle = HarmonizedAngle();
else
angle = Angle(point);
}
}
// Reload this weapon.
void Hardpoint::Reload()
{
reload = 0.;
burstReload = 0.;
burstCount = outfit ? outfit->BurstCount() : 0;
}
// Uninstall the outfit from this port (if it has one).
void Hardpoint::Uninstall()
{
outfit = nullptr;
}
// Update any counters that change when this projectile fires.
void Hardpoint::Fire(Ship &ship, const Point &start, const Angle &aim)
{
// Since this is only called internally, it is safe to assume that the
// outfit pointer is not null.
// Reset the reload count.
reload += outfit->Reload();
burstReload += outfit->BurstReload();
--burstCount;
isFiring = true;
// Anti-missile sounds can be specified either in the outfit itself or in
// the effect they create.
if(outfit->WeaponSound())
Audio::Play(outfit->WeaponSound(), start);
// Apply any "kick" from firing this weapon.
double force = outfit->FiringForce();
if(force)
ship.ApplyForce(aim.Unit() * -force);
// Expend any ammo that this weapon uses. Do this as the very last thing, in
// case the outfit is its own ammunition.
ship.ExpendAmmo(outfit);
}
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