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annotate Orchestland/Assets/LeapMotion/Widgets/Scripts/Utils/ExponentialSmoothing.cs @ 1:f7675884f2a1

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Add Orchestland project
author Daiki OYAKAWA <e135764@ie.u-ryukyu.ac.jp>
date Fri, 17 Jul 2015 23:09:20 +0900
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1 /// <summary>
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2 /// Time-step independent exponential smoothing.
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3 /// </summary>
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4 /// <remarks>
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5 /// When moving at a constant speed: speed * delay = Value - ExponentialSmoothing.value.
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6 /// </remarks>
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7 public class ExponentialSmoothing
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8 {
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9 public float value = 0f; // Filtered value
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10 public float delay = 0f; // Mean delay
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11 public bool reset = true; // Reset on Next Update
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13 public void SetAlpha(float alpha, float deltaTime = 1f)
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14 {
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15 this.delay = deltaTime * alpha / (1f - alpha);
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16 }
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18 public float Update(float value, float deltaTime = 1f)
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19 {
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20 if (deltaTime > 0f &&
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21 !reset) {
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22 float gamma = delay / deltaTime;
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23 float alpha = gamma / (1f + gamma);
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24 // NOTE: If deltaTime -> 0 then alpha -> 1,
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25 // reducing the filter to this.value = value.
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26 this.value *= 1f - alpha;
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27 this.value += alpha * value;
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28 } else {
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29 this.value = value;
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30 reset = false;
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31 }
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32 return this.value;
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33 }
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34 }