WPF中从旧值到新值的平滑过渡

在窗口中是一个具有一定大小的矩形，我需要为该矩形设置一个新的大小，逐渐将其旧大小更改为新大小。或者，例如，必须将其平滑的矩形旋转。怎么做

编辑

我想我表达得不好。 例如，我有一个尺寸为200 x 300的矩形。我试着给它添加新的维度：400乘200，我希望他不要快速应用新的、平滑的动画命中目标值

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我想这在WPF中是如何实现的？我不知道你所说的将矩形变平滑是什么意思

故事板。此示例甚至显示如何调整矩形的大小

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老问题，但我有同样的问题并找到了解决方案

我认为用xaml是不可能的，只能用代码

using System.Windows.Media.Animation; // this is needed for use DoubleAnimation in code

...

private void ResizeRectangle(double width, double height)
{
    // Height
    DoubleAnimation a = new DoubleAnimation();
    a.From = MyRectangle.ActualHeight; // animation start with actual height
    a.To = height; // desired height
    a.Duration = new Duration(TimeSpan.FromSeconds(1)); // duration for From to To (you can use miliseconds), this make smooth transition from the old to the new values
    a.FillBehavior = FillBehavior.Stop; // FillBehavior should be stop, if you want do another size changes
    MyRectangle.BeginAnimation(Rectangle.HeightProperty, a);  // set up animation for MyRectangle

    MyRectangle.Height = height; // don't forget change size for rectangle, because FillBehavior.Stop stop animation and it set back to actual size

    // Width
    DoubleAnimation b = new DoubleAnimation();
    b.From = MyRectangle.ActualWidth;
    b.To = width;
    b.Duration = new Duration(TimeSpan.FromSeconds(1));
    b.FillBehavior = FillBehavior.Stop;
    MyRectangle.BeginAnimation(Rectangle.WidthProperty, b);

    MyRectangle.Width = width;
}

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这就是链接中的示例所做的。你试过了吗？我不知道我怎么能用它。我更改此设置：retangle1.Size=新大小（400200）；我需要在动画中应用新的设置。所以你没有尝试，因为这正是故事板和双动画所做的。这不是新的尺寸总是任意的，sledovatelnoi旧的任意。私有无效按钮\u单击（对象发送器，路由目标）{MyRectangle.Height=400；MyRectangle.Width=300；}

using System.Windows.Media.Animation; // this is needed for use DoubleAnimation in code

...

private void ResizeRectangle(double width, double height)
{
    // Height
    DoubleAnimation a = new DoubleAnimation();
    a.From = MyRectangle.ActualHeight; // animation start with actual height
    a.To = height; // desired height
    a.Duration = new Duration(TimeSpan.FromSeconds(1)); // duration for From to To (you can use miliseconds), this make smooth transition from the old to the new values
    a.FillBehavior = FillBehavior.Stop; // FillBehavior should be stop, if you want do another size changes
    MyRectangle.BeginAnimation(Rectangle.HeightProperty, a);  // set up animation for MyRectangle

    MyRectangle.Height = height; // don't forget change size for rectangle, because FillBehavior.Stop stop animation and it set back to actual size

    // Width
    DoubleAnimation b = new DoubleAnimation();
    b.From = MyRectangle.ActualWidth;
    b.To = width;
    b.Duration = new Duration(TimeSpan.FromSeconds(1));
    b.FillBehavior = FillBehavior.Stop;
    MyRectangle.BeginAnimation(Rectangle.WidthProperty, b);

    MyRectangle.Width = width;
}