RunningAverage.cs

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using System.Diagnostics;
 
namespace Game {
    public class RunningAverage {
        public long m_startTicks;
 
        public long m_period;
 
        public float m_sumValues;
 
        public int m_countValues;
 
        public float m_value;
 
        public float Value => m_value;
 
        public RunningAverage(float period) => m_period = (long)(period * Stopwatch.Frequency);
 
        public void AddSample(float sample) {
            m_sumValues += sample;
            m_countValues++;
            long timestamp = Stopwatch.GetTimestamp();
            if (timestamp >= m_startTicks + m_period) {
                m_value = m_sumValues / m_countValues;
                m_sumValues = 0f;
                m_countValues = 0;
                m_startTicks = timestamp;
            }
        }
    }
}