https://learn.microsoft.com/zh-cn/dotnet/api/system.windows.media.animation.easingpointkeyframe?view=netframework-4.8.1&viewFallbackFrom=windowsdesktop-10.0
EasingPointKeyFrame Class (System.Windows.Media.Animation) | Microsoft Learn
A class that enables you to associate easing functions with a PointAnimationUsingKeyFrames key frame animation.
class systemwindows mediaanimationmicrosoftlearn