/*PRIVATE FUNCTIONS*/
void Projectile::updateCurrent(sf::Time dt, CommandQueue& commands) {
if (isGuided()) {
const float approachRate = 200.f;
sf::Vector2f newVel = unitVector(approachRate * dt.asSeconds() * targetDirection + getVelocity());
newVel *= getMaxSpeed();
float angle = std::atan2(newVel.y, newVel.x);
setRotation(toDegree(angle) + 90.f);
setVelocity(newVel); //rotation and velocity set
}
Entity::updateCurrent(dt, commands); //rotation and velocity drawn on screen
}
Projectile::Projectile(Type type, const TextureHolder& textures)
: Entity(1)
, mType(type)
, mSprite(textures.get(Table[type].texture), Table[type].textureRect)
, mTargetDirection()
{
centerOrigin(mSprite);
// Add particle system for missiles
if (isGuided())
{
std::unique_ptr<EmitterNode> smoke(new EmitterNode(Particle::Smoke));
smoke->setPosition(0.f, getBoundingRect().height / 2.f);
attachChild(std::move(smoke));
std::unique_ptr<EmitterNode> propellant(new EmitterNode(Particle::Propellant));
propellant->setPosition(0.f, getBoundingRect().height / 2.f);
attachChild(std::move(propellant));
}
}
/*PUBLIC FUNCTIONS*/
void Projectile::guideTowards(sf::Vector2f position) {
assert(isGuided());
targetDirection = unitVector(position - getWorldPosition());
}
