private void AsyncCorrection(object sender, DoWorkEventArgs e)
{
const int nSamples = 10;
Queue <int> queue = new Queue <int>();
int? meanDesiredBrightness = null;
while (working)
{
if (desiredBrightness == null || desiredBrightness.Value == currentBrightness)
{
continue;
}
if (meanDesiredBrightness == null)
{
meanDesiredBrightness = desiredBrightness;
}
while (queue.Count < nSamples)
{
queue.Enqueue(desiredBrightness.Value);
}
queue.Enqueue(desiredBrightness.Value);
while (queue.Count > nSamples)
{
queue.TryDequeue(out int _);
}
// calcualte the mean of signal to filter fast changes
int newMeanDesiredBrightness = Enumerable.Sum(queue) / nSamples;
// filter small changes
if (Math.Abs(newMeanDesiredBrightness - meanDesiredBrightness.Value) > 3)
{
meanDesiredBrightness = newMeanDesiredBrightness;
}
// smooth update of current brightness
int Delta = (meanDesiredBrightness.Value - currentBrightness) / 3;
if (Delta == 0)
{
continue;
}
currentBrightness += Delta;
Corrected?.Invoke(currentBrightness);
Thread.Sleep(50);
}
}
public override void Update(int value)
{
if (Math.Abs(value - currentBrightness) >= 10)
{
long now = DateTime.Now.Ticks / TimeSpan.TicksPerMillisecond;
if (LastUpdated != null && (now - LastUpdated.Value) < 500) // value isn't stable for 500ms
{
LastUpdated = now;
}
else
{
currentBrightness = value;
Corrected?.Invoke(value);
}
}
}
