Charging a Charge Shot

ChargeFXIndicatorSystem.cs

public class ChargeFXIndicatorSystem : ComponentSystem {

    private ComponentGroup particleGroup, playerGroup;

    protected override void OnCreateManager() {
        particleGroup = GetComponentGroup(ComponentType.ReadOnly<ParticleSystemPair>(), ComponentType.ReadOnly<ID>());
        playerGroup   = GetComponentGroup(ComponentType.ReadOnly<ChargeShotTimer>(), ComponentType.ReadOnly<ID>());
    }

    protected override void OnUpdate() {
        var playerEntities = playerGroup.GetEntityArray();
        var times          = new NativeArray<ChargeShotTimer>(playerEntities.Length, Allocator.Temp);
        ForEach((ref ChargeShotTimer timer, ref ID id) => {
            times[id.Value] = timer;
        }, playerGroup);

        ForEach((ParticleSystemPair pair, ref ID id) => {
            var time = times[id.Value];

            if (time.Current <= float.Epsilon) {
                pair.Parent.Clear(true);
                pair.Parent.Stop(true);
                pair.Parent.time = pair.Child.time = 0f;
            }

            if (time.Current > 0f && !pair.Child.isPlaying) {
                pair.Child.Play(false);
            }

            if (time.Current >= time.Wait) {
                pair.Parent.Play(false);
            }
        }, particleGroup);

        times.Dispose();
    }
}