C++ SpriteManager::GetNearestSprite方法代码示例

/**\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() );
	}
}

void Gate::Update() {
	// The Bottom Gate doesn't do anything
	if(!top) return;

	SpriteManager *sprites = SpriteManager::Instance();
	Sprite* ship = sprites->GetNearestSprite( (Sprite*)this, 50,DRAW_ORDER_SHIP|DRAW_ORDER_PLAYER );

	if(ship!=NULL) {
		if(exitID != 0) {
			SendToExit(ship);
		} else if(rand()&1) {
			SendToRandomLocation(ship);
		} else {
			SendRandomDistance(ship);
		}
	}
}