/**\brief Update the Projectile
*
* Projectiles do all the normal Sprite things like moving.
* Projectiles check for collisions with nearby Ships, and if they collide,
* they deal damage to that ship. Note that since each projectile knows which ship fired it and will never collide with them.
*
* Projectiles have a life time limit (in milli-seconds). Each tick they need
* to check if they've lived to long and need to disappear.
*
* Projectiles have the ability to track down a specific target. This only
* means that they will turn slightly to head towards their target.
*/
void Projectile::Update( void ) {
Sprite::Update(); // update momentum and other generic sprite attributes
SpriteManager *sprites = SpriteManager::Instance();
// Check for projectile collisions
Sprite* impact = sprites->GetNearestSprite( (Sprite*)this, 100,DRAW_ORDER_SHIP|DRAW_ORDER_PLAYER );
if( (impact != NULL) && (impact->GetID() != ownerID) && ((this->GetWorldPosition() - impact->GetWorldPosition()).GetMagnitude() < impact->GetRadarSize() )) {
((Ship*)impact)->Damage( (weapon->GetPayload())*damageBoost );
sprites->Delete( (Sprite*)this );
// Create a fire burst where this projectile hit the ship's shields.
// TODO: This shows how much we need to improve our collision detection.
Effect* hit = new Effect(this->GetWorldPosition(), "Resources/Animations/shield.ani", 0);
hit->SetAngle( -this->GetAngle() );
hit->SetMomentum( impact->GetMomentum() );
sprites->Add( hit );
}
// Expire the projectile after a time period
if (( Timer::GetTicks() > secondsOfLife + start )) {
sprites->Delete( (Sprite*)this );
}
// Track the target
Sprite* target = sprites->GetSpriteByID( targetID );
float tracking = weapon->GetTracking();
if( target != NULL && tracking > 0.00000001f ) {
float angleTowards = normalizeAngle( ( target->GetWorldPosition() - this->GetWorldPosition() ).GetAngle() - GetAngle() );
SetMomentum( GetMomentum().RotateBy( angleTowards*tracking ) );
SetAngle( GetMomentum().GetAngle() );
}
}
/**\brief Constructor
*/
Projectile::Projectile(float damageBooster, float angleToFire, Coordinate worldPosition, Coordinate firedMomentum, Weapon* _weapon)
{
damageBoost=damageBooster;
// All Projectiles get these
ownerID = 0;
targetID = 0;
start = Timer::GetTicks();
SetRadarColor (Color(0x55,0x55,0x55));
// These are based off of the Ship firing this projectile
SetWorldPosition( worldPosition );
SetAngle(angleToFire);
// These are based off of the Weapon
weapon = _weapon;
secondsOfLife = weapon->GetLifetime();
SetImage(weapon->GetImage());
Trig *trig = Trig::Instance();
Coordinate momentum = GetMomentum();
float angle = static_cast<float>(trig->DegToRad( angleToFire ));
momentum = firedMomentum +
Coordinate( trig->GetCos( angle ) * weapon->GetVelocity(),
-trig->GetSin( angle ) * weapon->GetVelocity() );
SetMomentum( momentum );
}
/**\brief Update function on every frame.
*/
void Ship::Update( lua_State *L ) {
Sprite::Update( L ); // update momentum and other generic sprite attributes
if( status.isAccelerating == false
&& status.isRotatingLeft == false
&& status.isRotatingRight == false) {
flareAnimation->Reset();
}
flareAnimation->Update();
Coordinate momentum = GetMomentum();
momentum.EnforceMagnitude( shipStats.GetMaxSpeed()*engineBooster );
// Show the hits taken as part of the radar color
if(IsDisabled()) SetRadarColor( GREY );
else SetRadarColor( RED * GetHullIntegrityPct() );
// Ship has taken as much damage as possible...
// It Explodes!
if( status.hullDamage >= (float)shipStats.GetHullStrength() ) {
SpriteManager *sprites = Simulation_Lua::GetSimulation(L)->GetSpriteManager();
Camera* camera = Simulation_Lua::GetSimulation(L)->GetCamera();
// Play explode sound
if(OPTION(int, "options/sound/explosions")) {
Sound *explodesnd = Sound::Get("Resources/Audio/Effects/18384__inferno__largex.wav.ogg");
explodesnd->Play( GetWorldPosition() - camera->GetFocusCoordinate());
}
// Create Explosion
sprites->Add( new Effect( GetWorldPosition(), "Resources/Animations/explosion1.ani", 0) );
// Remove this Sprite from the SpriteManager
sprites->Delete( (Sprite*)this );
}
/**\brief Adds damage to hull.
*/
void Ship::Damage(short int damage) {
if(status.shieldDamage >= ((float)shipStats.GetShieldStrength()) * shieldBooster)
status.hullDamage += damage;
else
status.shieldDamage += damage;
if( GetHullIntegrityPct() < .15 ) {
status.isDisabled = true;
SetMomentum( GetMomentum() * .75 );
}
}
/**\brief Accelerates the ship.
* \sa Model::GetAcceleration
*/
void Ship::Accelerate( void ) {
Trig *trig = Trig::Instance();
Coordinate momentum = GetMomentum();
float angle = static_cast<float>(trig->DegToRad( GetAngle() ));
float speed = shipStats.GetMaxSpeed()*engineBooster;
float acceleration = (shipStats.GetForceOutput() *engineBooster ) / shipStats.GetMass();
momentum += Coordinate( trig->GetCos( angle ) * acceleration * Timer::GetDelta(),
-1 * trig->GetSin( angle ) * acceleration * Timer::GetDelta() );
momentum.EnforceMagnitude(speed);
SetMomentum( momentum );
status.isAccelerating = true;
// Play engine sound
float engvol = OPTION(float,"options/sound/engines");
Coordinate offset = GetWorldPosition() - Camera::Instance()->GetFocusCoordinate();
if ( this->GetDrawOrder() == DRAW_ORDER_SHIP )
engvol = engvol * NON_PLAYER_SOUND_RATIO ;
this->engine->GetSound()->SetVolume( engvol );
this->engine->GetSound()->PlayNoRestart( offset );
}
