Gewusst wie: Animieren von Color mithilfe von Keyframes
In diesem Beispiel wird die Animation von Color eines SolidColorBrush mithilfe von Keyframes dargestellt.
Beispiel
Im folgenden Beispiel wird die ColorAnimationUsingKeyFrames-Klasse verwendet, um die Color-Eigenschaft eines SolidColorBrush zu animieren. In dieser Animation werden drei Keyframes folgendermaßen verwendet:
In den ersten zwei Sekunden wird eine Instanz der LinearColorKeyFrame-Klasse verwendet, um die Farbe allmählich von Grün zu Rot zu ändern. Durch lineare Keyframes wie LinearColorKeyFrame wird ein glatter, linearer Übergang zwischen Werten ermöglicht.
Am Ende der nächsten halben Sekunde wird eine Instanz der DiscreteColorKeyFrame-Klasse verwendet, um die Farbe schnell von Rot zu Gelb zu ändern. Diskrete Keyframes wie DiscreteColorKeyFrame können abrupte Veränderungen zwischen Werten herstellen, d. h. die Farbveränderung in diesem Teil der Animation tritt schnell auf und ist deutlich sichtbar.
In den letzten zwei Sekunden wird eine Instanz der SplineColorKeyFrame-Klasse verwendet, um die Farbe erneut zu ändern: in diesem Fall von Gelb in Grün. Spline-Keyframes wie SplineColorKeyFrame erzeugen einen variablen Übergang zwischen Werten, die von der KeySpline-Eigenschaft bestimmt werden. In diesem Beispiel beginnt die Farbveränderung zunächst langsam und beschleunigt dann exponentiell im letzten Bereich des Zeitabschnitts.
Imports System
Imports System.Windows
Imports System.Windows.Controls
Imports System.Windows.Shapes
Imports System.Windows.Media.Animation
Imports System.Windows.Media
Namespace Microsoft.Samples.KeyFrameExamples
Public Class ColorAnimationUsingKeyFramesExample
Inherits Page
Public Sub New()
Title = "BooleanAnimationUsingKeyFrames Example"
Background = Brushes.White
Margin = New Thickness(20)
' Create a NameScope for this page so that
' Storyboards can be used.
NameScope.SetNameScope(Me, New NameScope())
Dim myStackPanel As New StackPanel()
myStackPanel.Orientation = Orientation.Vertical
myStackPanel.HorizontalAlignment = HorizontalAlignment.Center
' Create the Border that is the target of the animation.
Dim animatedBrush As New SolidColorBrush()
animatedBrush.Color = Color.FromArgb(255, 0, 255, 0)
Dim myBorder As New Border()
' Set the initial color of the border to green.
myBorder.BorderBrush = animatedBrush
myBorder.BorderThickness = New Thickness(28)
myBorder.Padding = New Thickness(20)
myStackPanel.Children.Add(myBorder)
' Create a TextBlock to host inside the Border.
Dim myTextBlock As New TextBlock()
myTextBlock.Text = "This example shows how to use the ColorAnimationUsingKeyFrames" & " to create an animation on the BorderBrush property of a Border."
myBorder.Child = myTextBlock
' Assign the Brush a name so that
' it can be targeted by a Storyboard.
Me.RegisterName("AnimatedBrush", animatedBrush)
' Create a ColorAnimationUsingKeyFrames to
' animate the BorderBrush property of the Button.
Dim colorAnimation As New ColorAnimationUsingKeyFrames()
colorAnimation.Duration = TimeSpan.FromSeconds(6)
' Create brushes to use as animation values.
Dim redColor As New Color()
redColor = Color.FromArgb(255, 255, 0, 0)
Dim yellowColor As New Color()
yellowColor = Color.FromArgb(255, 255, 255, 0)
Dim greenColor As New Color()
greenColor = Color.FromArgb(255, 0, 255, 0)
' Go from green to red in the first 2 seconds. LinearColorKeyFrame creates
' a smooth, linear animation between values.
colorAnimation.KeyFrames.Add(New LinearColorKeyFrame(redColor, KeyTime.FromTimeSpan(TimeSpan.FromSeconds(2.0)))) ' KeyTime - Target value (KeyValue)
' In the next half second, go to yellow. DiscreteColorKeyFrame creates a
' sudden jump between values.
colorAnimation.KeyFrames.Add(New DiscreteColorKeyFrame(yellowColor, KeyTime.FromTimeSpan(TimeSpan.FromSeconds(2.5)))) ' KeyTime - Target value (KeyValue)
' In the final 2 seconds of the animation, go from yellow back to green. SplineColorKeyFrame
' creates a variable transition between values depending on the KeySpline property. In this example,
' the animation starts off slow but toward the end of the time segment, it speeds up exponentially.
colorAnimation.KeyFrames.Add(New SplineColorKeyFrame(greenColor, KeyTime.FromTimeSpan(TimeSpan.FromSeconds(4.5)), New KeySpline(0.6, 0.0, 0.9, 0.0))) ' KeySpline - KeyTime - Target value (KeyValue)
' Set the animation to repeat forever.
colorAnimation.RepeatBehavior = RepeatBehavior.Forever
' Set the animation to target the Color property
' of the object named "AnimatedBrush".
Storyboard.SetTargetName(colorAnimation, "AnimatedBrush")
Storyboard.SetTargetProperty(colorAnimation, New PropertyPath(SolidColorBrush.ColorProperty))
' Create a storyboard to apply the animation.
Dim myStoryboard As New Storyboard()
myStoryboard.Children.Add(colorAnimation)
' Start the storyboard when the Border loads.
AddHandler myBorder.Loaded, Sub(sender As Object, e As RoutedEventArgs) myStoryboard.Begin(Me)
Content = myStackPanel
End Sub
End Class
End Namespace
using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Shapes;
using System.Windows.Media.Animation;
using System.Windows.Media;
namespace Microsoft.Samples.KeyFrameExamples
{
public class ColorAnimationUsingKeyFramesExample : Page
{
public ColorAnimationUsingKeyFramesExample()
{
Title = "BooleanAnimationUsingKeyFrames Example";
Background = Brushes.White;
Margin = new Thickness(20);
// Create a NameScope for this page so that
// Storyboards can be used.
NameScope.SetNameScope(this, new NameScope());
StackPanel myStackPanel = new StackPanel();
myStackPanel.Orientation = Orientation.Vertical;
myStackPanel.HorizontalAlignment = HorizontalAlignment.Center;
// Create the Border that is the target of the animation.
SolidColorBrush animatedBrush = new SolidColorBrush();
animatedBrush.Color = Color.FromArgb(255, 0, 255, 0);
Border myBorder = new Border();
// Set the initial color of the border to green.
myBorder.BorderBrush = animatedBrush;
myBorder.BorderThickness = new Thickness(28);
myBorder.Padding = new Thickness(20);
myStackPanel.Children.Add(myBorder);
// Create a TextBlock to host inside the Border.
TextBlock myTextBlock = new TextBlock();
myTextBlock.Text = "This example shows how to use the ColorAnimationUsingKeyFrames"
+ " to create an animation on the BorderBrush property of a Border.";
myBorder.Child = myTextBlock;
// Assign the Brush a name so that
// it can be targeted by a Storyboard.
this.RegisterName(
"AnimatedBrush", animatedBrush);
// Create a ColorAnimationUsingKeyFrames to
// animate the BorderBrush property of the Button.
ColorAnimationUsingKeyFrames colorAnimation
= new ColorAnimationUsingKeyFrames();
colorAnimation.Duration = TimeSpan.FromSeconds(6);
// Create brushes to use as animation values.
Color redColor = new Color();
redColor = Color.FromArgb(255, 255, 0, 0);
Color yellowColor = new Color();
yellowColor = Color.FromArgb(255, 255, 255, 0);
Color greenColor = new Color();
greenColor = Color.FromArgb(255, 0, 255, 0);
// Go from green to red in the first 2 seconds. LinearColorKeyFrame creates
// a smooth, linear animation between values.
colorAnimation.KeyFrames.Add(
new LinearColorKeyFrame(
redColor, // Target value (KeyValue)
KeyTime.FromTimeSpan(TimeSpan.FromSeconds(2.0))) // KeyTime
);
// In the next half second, go to yellow. DiscreteColorKeyFrame creates a
// sudden jump between values.
colorAnimation.KeyFrames.Add(
new DiscreteColorKeyFrame(
yellowColor, // Target value (KeyValue)
KeyTime.FromTimeSpan(TimeSpan.FromSeconds(2.5))) // KeyTime
);
// In the final 2 seconds of the animation, go from yellow back to green. SplineColorKeyFrame
// creates a variable transition between values depending on the KeySpline property. In this example,
// the animation starts off slow but toward the end of the time segment, it speeds up exponentially.
colorAnimation.KeyFrames.Add(
new SplineColorKeyFrame(
greenColor, // Target value (KeyValue)
KeyTime.FromTimeSpan(TimeSpan.FromSeconds(4.5)), // KeyTime
new KeySpline(0.6, 0.0, 0.9, 0.0) // KeySpline
)
);
// Set the animation to repeat forever.
colorAnimation.RepeatBehavior = RepeatBehavior.Forever;
// Set the animation to target the Color property
// of the object named "AnimatedBrush".
Storyboard.SetTargetName(colorAnimation, "AnimatedBrush");
Storyboard.SetTargetProperty(
colorAnimation, new PropertyPath(SolidColorBrush.ColorProperty));
// Create a storyboard to apply the animation.
Storyboard myStoryboard = new Storyboard();
myStoryboard.Children.Add(colorAnimation);
// Start the storyboard when the Border loads.
myBorder.Loaded += delegate(object sender, RoutedEventArgs e)
{
myStoryboard.Begin(this);
};
Content = myStackPanel;
}
}
}
<Page xmlns="https://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="https://schemas.microsoft.com/winfx/2006/xaml"
Title="ThicknessAnimationUsingKeyFrames Example">
<StackPanel Orientation="Vertical" HorizontalAlignment="Center">
<Border Background="#99FFFFFF" BorderThickness="28"
Margin="0,60,0,20" Padding="20" >
<Border.BorderBrush>
<SolidColorBrush x:Name="MyAnimatedBrush" Color="Green" />
</Border.BorderBrush>
<Border.Triggers>
<EventTrigger RoutedEvent="Border.Loaded">
<BeginStoryboard>
<Storyboard>
<!-- Animate from green to red using a linear key frame, from red to
yellow using a discrete key frame, and from yellow back to green with
a spline key frame. This animation repeats forever. -->
<ColorAnimationUsingKeyFrames
Storyboard.TargetProperty="Color"
Storyboard.TargetName="MyAnimatedBrush"
Duration="0:0:6" FillBehavior="HoldEnd" RepeatBehavior="Forever">
<ColorAnimationUsingKeyFrames.KeyFrames>
<!-- Go from green to red in the first 2 seconds. LinearColorKeyFrame creates
a smooth, linear animation between values. -->
<LinearColorKeyFrame Value="Red" KeyTime="0:0:2" />
<!-- In the next half second, go to yellow. DiscreteColorKeyFrame creates a
sudden jump between values. -->
<DiscreteColorKeyFrame Value="Yellow" KeyTime="0:0:2.5" />
<!-- In the final 2 seconds of the animation, go from yellow back to green. SplineColorKeyFrame
creates a variable transition between values depending on the KeySpline property. In this example,
the animation starts off slow but toward the end of the time segment, it speeds up exponentially.-->
<SplineColorKeyFrame Value="Green" KeyTime="0:0:4.5" KeySpline="0.6,0.0 0.9,0.00" />
</ColorAnimationUsingKeyFrames.KeyFrames>
</ColorAnimationUsingKeyFrames>
</Storyboard>
</BeginStoryboard>
</EventTrigger>
</Border.Triggers>
<TextBlock>
This example shows how to use the ColorAnimationUsingKeyFrames to create
an animation on the BorderBrush property of a Border.
</TextBlock>
</Border>
</StackPanel>
</Page>
Das vollständige Beispiel finden Sie unter Beispiel für eine Keyframe-Animation.
Siehe auch
Referenz
Konzepte
Übersicht über Keyframe-Animationen