在后面的代码中在 WPF 中创建一个闪烁动画
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Create a Blink animation in WPF in code behind
提问by Vahid
I want to apply a Blinkanimation to a Canvasso that all the objects I have drawn on it would blink with it.
我想对 a 应用Blink动画，Canvas以便我在其上绘制的所有对象都会随着它闪烁。
I have been somewhat successful using the code below which changes the Opacityproperty of the Canvasrather fast to achieve this effect but I'm kinda not satisfied with it.
我使用下面的代码取得了一些成功，该代码更改了相当快的Opacity属性Canvas以实现此效果，但我对此不太满意。
I would prefer a pure blink without any FadeOut/FadeInas in my current code. How can I do it the right way?
我更喜欢FadeOut/FadeIn在我当前的代码中没有任何闪烁的纯闪烁。我怎样才能以正确的方式做到这一点？
var blinkAnimation = new DoubleAnimation
{
From = 1,
To = 0
};
var blinkStoryboard = new Storyboard
{
Duration = TimeSpan.FromMilliseconds(500),
RepeatBehavior = RepeatBehavior.Forever,
AutoReverse = true
};
Storyboard.SetTarget(blinkAnimation, MyCanvas);
Storyboard.SetTargetProperty(blinkAnimation, new PropertyPath(OpacityProperty));
blinkStoryboard.Children.Add(blinkAnimation);
MyCanvas.BeginStoryboard(blinkStoryboard);
Maybe I can do that using the VisibilityPropertybut I couldn't get it right.
也许我可以使用 来做到这一点，VisibilityProperty但我做对了。
回答by Clemens
You might use a second animation with an appropriate BeginTime:
您可以使用带有适当的第二个动画BeginTime：
var switchOffAnimation = new DoubleAnimation
{
To = 0,
Duration = TimeSpan.Zero
};
var switchOnAnimation = new DoubleAnimation
{
To = 1,
Duration = TimeSpan.Zero,
BeginTime = TimeSpan.FromSeconds(0.5)
};
var blinkStoryboard = new Storyboard
{
Duration = TimeSpan.FromSeconds(1),
RepeatBehavior = RepeatBehavior.Forever
};
Storyboard.SetTarget(switchOffAnimation, MyCanvas);
Storyboard.SetTargetProperty(switchOffAnimation, new PropertyPath(Canvas.OpacityProperty));
blinkStoryboard.Children.Add(switchOffAnimation);
Storyboard.SetTarget(switchOnAnimation, MyCanvas);
Storyboard.SetTargetProperty(switchOnAnimation, new PropertyPath(Canvas.OpacityProperty));
blinkStoryboard.Children.Add(switchOnAnimation);
MyCanvas.BeginStoryboard(blinkStoryboard);
回答by dkozl
If you want on/off state for your animation you can change your animation to DoubleAnimationUsingKeyFrames
如果您想要动画的开/关状态，您可以将动画更改为 DoubleAnimationUsingKeyFrames
var blinkAnimation = new DoubleAnimationUsingKeyFrames();
blinkAnimation.KeyFrames.Add(new DiscreteDoubleKeyFrame(1, KeyTime.FromTimeSpan(TimeSpan.FromMilliseconds(0))));
blinkAnimation.KeyFrames.Add(new DiscreteDoubleKeyFrame(0, KeyTime.FromTimeSpan(TimeSpan.FromMilliseconds(250))));
var blinkStoryboard = new Storyboard
{
Duration = TimeSpan.FromMilliseconds(500),
RepeatBehavior = RepeatBehavior.Forever,
};
Storyboard.SetTarget(blinkAnimation, MyCanvas);
Storyboard.SetTargetProperty(blinkAnimation, new PropertyPath(OpacityProperty));
blinkStoryboard.Children.Add(blinkAnimation);
blinkStoryboard.Begin();
