port from perforce

aiwaz/Backup/Aiwaz.Common/Animations/LinearValueAnimation.cs

@@ -0,0 +1,21 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace Aiwaz.Common.Animations
+{
+    public class LinearValueAnimation : ValueAnimation
+    {
+        public LinearValueAnimation()
+            : base()
+        {
+            AnimationName = "Linear";
+        }
+
+        protected override float Calculate(double NormalizedTime)
+        {
+            return (float)(StartValue * (1.0 - NormalizedTime) + EndValue * NormalizedTime);
+        }
+    }
+}