public IComponent Clone()
{
DestroyedOnParentDestroyedComponent ret = new DestroyedOnParentDestroyedComponent();
ret.parent = parent;
return ret;
}
//Note: timerPhaseAngle is expected to be in the interval [0, 1]
private void createPlayerGun(IEntityManager entityStore, Entity player, Entity bullet, float offsetProportion, float timerPhaseAngle)
{
//compute the gun's offset from the player, then create the gun
AABBComponent bulletBox = (AABBComponent)bullet.components[typeof(AABBComponent)];
AABBComponent playerBox = (AABBComponent)player.components[typeof(AABBComponent)];
Entity gun = createPositionSlavedEntity(player, new Vector2(playerBox.Width + 0.1f, playerBox.Height * offsetProportion - bulletBox.Height / 2.0f));
//The gun now has a position coupled to that of the player
//So spawn bullets at the gun!
SpawnEntityComponent spawner = new SpawnEntityComponent();
spawner.Factory = new ComposedEntityFactory(new List<IEntityFactory>() {
new CloneEntityFactory(bullet),
new InheritParentComponentEntityFactory(typeof(PositionComponent)) });
//Bullets should be spawned periodically
PeriodicAddComponentComponent timer = new PeriodicAddComponentComponent();
timer.Period = 200.0f;
timer.TimeSinceLastFiring = timer.Period * timerPhaseAngle;
timer.ComponentToAdd = spawner;
gun.AddComponent(timer);
//The gun should be removed from the world when the player dies
DestroyedOnParentDestroyedComponent existentialDependency = new DestroyedOnParentDestroyedComponent();
existentialDependency.parent = player;
gun.AddComponent(existentialDependency);
//finally, add the gun to the world
entityStore.Add(gun);
}