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diff --git a/Samples/AnimTest/Animation/ShakeAnimation.cs b/Samples/AnimTest/Animation/ShakeAnimation.cs
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+++ b/Samples/AnimTest/Animation/ShakeAnimation.cs
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+// Copyright (c) 2015-2021  Jean-Philippe Bruyère <jp_bruyere@hotmail.com>
+//
+// This code is licensed under the MIT license (MIT) (http://opensource.org/licenses/MIT)
+
+using System;
+
+namespace vke
+{
+	public class ShakeAnimation : Animation
+	{
+		const float stepMin = 0.001f, stepMax = 0.005f;
+		bool rising = true;
+
+		public float LowBound;
+		public float HighBound;
+
+		#region CTOR
+		public ShakeAnimation(
+			Object instance,
+			string _propertyName,
+			float lowBound, float highBound)
+			: base(instance, _propertyName)
+		{
+
+			LowBound = Math.Min (lowBound, highBound);
+			HighBound = Math.Max (lowBound, highBound);
+
+			float value = getValue ();
+
+			if (value > HighBound)
+				rising = false;
+		}
+		#endregion
+
+		public override void Process ()
+		{
+			float value = getValue ();
+			float step = stepMin + (float)random.NextDouble () * stepMax;
+
+			if (rising) {
+				value += step;
+				if (value > HighBound) {
+					value = HighBound;
+					rising = false;
+				}
+			} else {
+				value -= step;
+				if (value < LowBound) {
+					value = LowBound;
+					rising = true;
+				} else if (value > HighBound)
+					value -= step * 10f;
+			}
+			setValue (value);
+		}
+
+	}
+
+}
+