Create GeometryKeyFrame.cs

src/Shared/HandyControl_Shared/Media/Animation/GeometryKeyFrame.cs

@@ -0,0 +1,54 @@
+using System;
+using System.Windows;
+using System.Windows.Media;
+using System.Windows.Media.Animation;
+
+public abstract class GeometryKeyFrame : Freezable, IKeyFrame
+{
+    protected GeometryKeyFrame(Geometry value)
+    {
+        Value = value;
+    }
+
+    protected GeometryKeyFrame(Geometry value, KeyTime keyTime)
+    {
+        Value = value;
+        KeyTime = keyTime;
+    }
+
+    public static readonly DependencyProperty KeyTimeProperty = DependencyProperty.Register(
+        "KeyTime", typeof(KeyTime), typeof(GeometryKeyFrame), new PropertyMetadata(KeyTime.Uniform));
+
+    public KeyTime KeyTime
+    {
+        get => (KeyTime) GetValue(KeyTimeProperty);
+        set => SetValue(KeyTimeProperty, value);
+    }
+
+    object IKeyFrame.Value
+    {
+        get => Value;
+        set => Value = (Geometry)value;
+    }
+
+    public static readonly DependencyProperty ValueProperty = DependencyProperty.Register(
+        "Value", typeof(Geometry), typeof(GeometryKeyFrame), new PropertyMetadata(default(Geometry)));
+
+    public Geometry Value
+    {
+        get => (Geometry) GetValue(ValueProperty);
+        set => SetValue(ValueProperty, value);
+    }
+
+    public Geometry InterpolateValue(Geometry baseValue, double keyFrameProgress)
+    {
+        if (keyFrameProgress < 0.0 || keyFrameProgress > 1.0)
+        {
+            throw new ArgumentOutOfRangeException(nameof(keyFrameProgress));
+        }
+
+        return InterpolateValueCore(baseValue, keyFrameProgress);
+    }
+
+    protected abstract Geometry InterpolateValueCore(Geometry baseValue, double keyFrameProgress);
+}