在 WPF 中，如何从代码后面向动画添加缓动功能？

Question

我正在代码中创建 doubleAniation，并且想为其添加缓动函数，那么我该怎么做呢？

Answer 1

没有必要使用 DoubleAnimationUsingKeyFrames - 只需使用 DoubleAnimation 即可完成：

CircleEase easing = new CircleEase();  // or whatever easing class you want
easing.EasingMode = EasingMode.EaseInOut;
DoubleAnimation scrollQueue = new DoubleAnimation();
scrollQueue.By = -singleScrollAmt;
scrollQueue.EasingFunction = easing;
scrollQueue.Duration = TimeSpan.FromSeconds(0.5);
MyTextBlock.BeginAnimation(Canvas.TopProperty, scrollQueue);

Answer 2

我是这样做的：

        DoubleAnimationUsingKeyFrames compassRoseAnimation = new DoubleAnimationUsingKeyFrames();
        compassRoseAnimation.Duration = new Duration(TimeSpan.FromSeconds(2));
        QuarticEase easingFunction = new QuarticEase();
        easingFunction.EasingMode = EasingMode.EaseInOut;
        EasingDoubleKeyFrame startAnimation = new EasingDoubleKeyFrame(previousRotationDegrees, KeyTime.FromPercent(0));
        EasingDoubleKeyFrame endAnimation = new EasingDoubleKeyFrame(newRotationDegrees, KeyTime.FromPercent(1.0), easingFunction);
        compassRoseAnimation.KeyFrames.Add(startAnimation);
        compassRoseAnimation.KeyFrames.Add(endAnimation);

        RotateTransform rotateTransform = new RotateTransform();
        CompassWithNumbersControl.RenderTransform = rotateTransform;
        rotateTransform.BeginAnimation(RotateTransform.AngleProperty, compassRoseAnimation);

Answer 3

我自己已经弄清楚了。我一直在寻找 Easing 属性，但实际上它被称为 KeySpline，我必须使用 DoubleAniamtionUsingKeyFrames 来代替，以获得缓动功能。