gistfile1.cpp

void Player::fire(const sf::Vector2f& direction)
{
    if(myFireCooldown <= sf::Time::Zero)
	{
		float angle = std::atan2(direction.y, direction.x);
		sf::Vector2f centerPosition = getCenterPosition();

		myFireCooldown = Player::FireCooldown;
		myMuzzleTimer = Player::MuzzleTime;
		myProjectiles->createProjectile(centerPosition + direction * Size / 2.f, rad2Degrees(angle), sf::Color::White);
		myMuzzleFlash->setPosition(centerPosition + direction * Size / 2.f);
		myMuzzleFlash->setEnabledFlag(true);
	}
}

gistfile2.cpp

void Player::updateLights(sf::Time elapsedTime, const sf::Vector2f& mousePosition)
{
    if(myMuzzleTimer <= sf::Time::Zero)
		myMuzzleFlash->setEnabledFlag(false);
	else
		myMuzzleTimer -= elapsedTime;

	sf::Vector2f centerPosition = getCenterPosition();
	sf::Vector2f toMouseVector = normalize(mousePosition - centerPosition);
	float toMouseAngle = rad2Degrees(std::atan2(toMouseVector.y, toMouseVector.x));

	myFlashLight->setPosition(centerPosition + toMouseVector * Size / 2.f);
	myFlashLight->setRotation(toMouseAngle);
	myLightOccluder->setPosition(centerPosition);
}

gistfile3.cpp

Vector2f directionToTarget = Normalize(targetPosition - myPosition);
Vector2f direction = Normalize(myVelocity + directionToTarget * elapsedTime)
myVelocity = direction * myVelocity.length();