port from perforce

aiwaz/Aiwaz.Common/Animations/ValueAnimation.cs

@@ -0,0 +1,40 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace Aiwaz.Common.Animations
+{
+    abstract public class ValueAnimation : Animation
+    {
+        public float StartValue { get; set; }
+        public float EndValue { get; set; }
+
+        public Func<float> ValueGetter;
+        public Action<float> ValueSetter;
+        public Func<string> ValueNamer;
+
+        public float Value
+        {
+            get { return ValueGetter(); }
+            set { ValueSetter(value); }
+        }
+
+        public ValueAnimation()
+            : base()
+        {
+            AnimationName = "Erroneous (Value)";
+        }
+
+        public override void Animate(double time, uint userData)
+        {
+            if (time < StartTime || time > EndTime)
+                return;
+
+            double Time = (time - StartTime) / (EndTime - StartTime);
+            Value = Calculate(Time);
+        }
+
+        protected abstract float Calculate(double NormalizedTime);
+    }
+}