private void Start()
{
// State stream
var chargingStateStream = Observable.EveryUpdate()
.Select(_ => Time.deltaTime)
.CombineLatest(_chargingStream.StartWith(false), Tuple.Create)
.Scan(ChargingFrameData.NotCharging(),
(lastData, timeAndIsCharging) =>
GetCurrentChargingState(lastData, timeAndIsCharging.Item1, timeAndIsCharging.Item2));
// Start playing charging audio on start of charging.
chargingStateStream
.Where(data => data.ChargingState == ChargingState.StartCharging)
.Subscribe(_ => PlayChargingAudio());
// And stop playing when charging is finished.
chargingStateStream
.Where(data => data.ChargingState == ChargingState.StopCharging)
.Subscribe(_ => StopChargingAudio());
// Calculate shooting force and fire when charging is finished.
var shooter = GetComponent <Shooter>();
chargingStateStream
.Where(data => data.ChargingState == ChargingState.StopCharging)
.Select(data => CalculateChargingForce(data.ChargingTime))
.Select(chargeForce => Mathf.Min(chargeForce, _maxLaunchForce))
.Subscribe(chargeForce => shooter.Fire(chargeForce));
// Stop charging when charge at maximum value.
chargingStateStream
.Where(data => data.ChargingState == ChargingState.ContinueCharging && data.ChargingTime > _maxChargeTime)
.Subscribe(_ => _chargingStream.OnNext(false));
// Create stream with current charge force and subscribe _chargingForce stream for this events.
chargingStateStream
.Select(data => data.ChargingState == ChargingState.ContinueCharging ? data.ChargingTime : 0f)
.Select(CalculateChargingForce)
.StartWith(0)
.Subscribe(_chargingForce);
// Subscribe for tank death - disable charging and set component off
GetComponent <UnitHealth>().HealthPercentageStream
.Subscribe(
f => { },
() =>
{
_chargingStream.OnNext(false);
enabled = false;
});
}
private ChargingFrameData GetCurrentChargingState(ChargingFrameData lastData, float frameTime, bool currentlyCharging)
{
switch (lastData.ChargingState)
{
case ChargingState.StartCharging:
case ChargingState.ContinueCharging:
return(currentlyCharging
? ChargingFrameData.ContinueCharging(frameTime + lastData.ChargingTime)
: ChargingFrameData.StopCharging(lastData.ChargingTime));
case ChargingState.NotCharging:
case ChargingState.StopCharging:
return(currentlyCharging
? ChargingFrameData.StartCharging(frameTime)
: ChargingFrameData.NotCharging());
default:
throw new ArgumentOutOfRangeException(nameof(lastData.ChargingState), lastData.ChargingState, null);
}
}