Gewusst wie: Animieren einer Rechteckgeometrie mithilfe von Keyframes
In diesem Beispiel wird die Animation der Rect-Eigenschaft einer RectangleGeometry mithilfe von Keyframes veranschaulicht.
Beispiel
Im folgenden Beispiel wird die RectAnimationUsingKeyFrames-Klasse verwendet, um die Rect-Eigenschaft eines RectangleGeometry zu animieren. In dieser Animation werden drei Keyframes folgendermaßen verwendet:
In den ersten zwei Sekunden wird die Instanz der LinearRectKeyFrame-Klasse verwendet, um Position, Breite und Höhe eines Rechtecks graduell zu ändern. Durch lineare Keyframes wie LinearRectKeyFrame wird ein glatter, linearer Übergang zwischen Werten ermöglicht.
Am Ende der nächsten halben Sekunde wird die Instanz einer DiscreteRectKeyFrame-Klasse verwendet, um die Höhe des Rechtecks abrupt zu verringern. Diskrete Keyframes wie DiscreteRectKeyFrame ermöglichen abrupte Änderungen zwischen Werten, d.h. die Verringerung der Höhe tritt schnell und deutlich sichtbar ein.
In den letzten zwei Sekunden wird eine Instanz der SplineRectKeyFrame-Klasse verwendet, um das Rechteck zurück auf seine Originalgröße und Ausgangsposition zu setzen. Spline-Keyframes wie SplineRectKeyFrame erzeugen einen variablen Übergang zwischen Werten, die von der KeySpline-Eigenschaft bestimmt werden. In diesem Beispiel beginnt die Veränderung 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
''' <summary>
''' This example shows how to use the RectAnimationUsingKeyFrames class to
''' animate the position and size of a rectangle.
''' Key frame animations enable you to create complex animations
''' by specifying multiple destination values
''' and controlling the animation's interpolation method.
''' </summary>
Public Class RectAnimationUsingKeyFramesExample
Inherits Page
Public Sub New()
Title = "RectAnimationUsingKeyFrames 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
'Add the Path Element
Dim myPath As New Path()
myPath.Stroke = Brushes.Black
myPath.Fill = Brushes.LemonChiffon
myPath.StrokeThickness = 1
' Create a RectangleGeometry to specify the Path data.
Dim myRectangleGeometry As New RectangleGeometry()
myRectangleGeometry.Rect = New Rect(0, 200, 100, 100)
myPath.Data = myRectangleGeometry
myStackPanel.Children.Add(myPath)
' Assign the TranslateTransform a name so that
' it can be targeted by a Storyboard.
Me.RegisterName("AnimatedRectangleGeometry", myRectangleGeometry)
' Create a RectAnimationUsingKeyFrames to
' animate the RectangleGeometry.
Dim rectAnimation As New RectAnimationUsingKeyFrames()
rectAnimation.Duration = TimeSpan.FromSeconds(6)
' Set the animation to repeat forever.
rectAnimation.RepeatBehavior = RepeatBehavior.Forever
' Animate position, width, and height in first 2 seconds. LinearRectKeyFrame creates
' a smooth, linear animation between values.
rectAnimation.KeyFrames.Add(New LinearRectKeyFrame(New Rect(600,50,200,50), KeyTime.FromTimeSpan(TimeSpan.FromSeconds(2)))) ' KeyTime - Target value (KeyValue)
' In the next half second, change height to 10. DiscreteRectKeyFrame creates a
' sudden "jump" between values.
rectAnimation.KeyFrames.Add(New DiscreteRectKeyFrame(New Rect(600, 50, 200, 10), KeyTime.FromTimeSpan(TimeSpan.FromSeconds(2.5)))) ' KeyTime - Target value (KeyValue)
' In the final 2 seconds of the animation, go back to the starting position, width, and height.
' Spline key frames like SplineRectKeyFrame 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.
rectAnimation.KeyFrames.Add(New SplineRectKeyFrame(New Rect(0, 200, 100, 100), 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 target the Rect property
' of the object named "AnimatedRectangleGeometry."
Storyboard.SetTargetName(rectAnimation, "AnimatedRectangleGeometry")
Storyboard.SetTargetProperty(rectAnimation, New PropertyPath(RectangleGeometry.RectProperty))
' Create a storyboard to apply the animation.
Dim rectStoryboard As New Storyboard()
rectStoryboard.Children.Add(rectAnimation)
' Start the storyboard after the rectangle loads.
AddHandler myPath.Loaded, Sub(sender As Object, e As RoutedEventArgs) rectStoryboard.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
{
/// <summary>
/// This example shows how to use the RectAnimationUsingKeyFrames class to
/// animate the position and size of a rectangle.
/// Key frame animations enable you to create complex animations
/// by specifying multiple destination values
/// and controlling the animation's interpolation method.
/// </summary>
public class RectAnimationUsingKeyFramesExample : Page
{
public RectAnimationUsingKeyFramesExample()
{
Title = "RectAnimationUsingKeyFrames 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;
//Add the Path Element
Path myPath = new Path();
myPath.Stroke = Brushes.Black;
myPath.Fill = Brushes.LemonChiffon;
myPath.StrokeThickness = 1;
// Create a RectangleGeometry to specify the Path data.
RectangleGeometry myRectangleGeometry = new RectangleGeometry();
myRectangleGeometry.Rect = new Rect(0, 200, 100, 100);
myPath.Data = myRectangleGeometry;
myStackPanel.Children.Add(myPath);
// Assign the TranslateTransform a name so that
// it can be targeted by a Storyboard.
this.RegisterName(
"AnimatedRectangleGeometry", myRectangleGeometry);
// Create a RectAnimationUsingKeyFrames to
// animate the RectangleGeometry.
RectAnimationUsingKeyFrames rectAnimation
= new RectAnimationUsingKeyFrames();
rectAnimation.Duration = TimeSpan.FromSeconds(6);
// Set the animation to repeat forever.
rectAnimation.RepeatBehavior = RepeatBehavior.Forever;
// Animate position, width, and height in first 2 seconds. LinearRectKeyFrame creates
// a smooth, linear animation between values.
rectAnimation.KeyFrames.Add(
new LinearRectKeyFrame(
new Rect(600,50,200,50), // Target value (KeyValue)
KeyTime.FromTimeSpan(TimeSpan.FromSeconds(2))) // KeyTime
);
// In the next half second, change height to 10. DiscreteRectKeyFrame creates a
// sudden "jump" between values.
rectAnimation.KeyFrames.Add(
new DiscreteRectKeyFrame(
new Rect(600, 50, 200, 10), // Target value (KeyValue)
KeyTime.FromTimeSpan(TimeSpan.FromSeconds(2.5))) // KeyTime
);
// In the final 2 seconds of the animation, go back to the starting position, width, and height.
// Spline key frames like SplineRectKeyFrame 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.
rectAnimation.KeyFrames.Add(
new SplineRectKeyFrame(
new Rect(0, 200, 100, 100), // 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 target the Rect property
// of the object named "AnimatedRectangleGeometry."
Storyboard.SetTargetName(rectAnimation, "AnimatedRectangleGeometry");
Storyboard.SetTargetProperty(
rectAnimation, new PropertyPath(RectangleGeometry.RectProperty));
// Create a storyboard to apply the animation.
Storyboard rectStoryboard = new Storyboard();
rectStoryboard.Children.Add(rectAnimation);
// Start the storyboard after the rectangle loads.
myPath.Loaded += delegate(object sender, RoutedEventArgs e)
{
rectStoryboard.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">
<Path Stroke="Black" StrokeThickness="1" Fill="LemonChiffon">
<Path.Data>
<RectangleGeometry x:Name="myRectangleGeometry" Rect="0,200,100,100" />
</Path.Data>
<Path.Triggers>
<EventTrigger RoutedEvent="Path.Loaded">
<BeginStoryboard>
<Storyboard>
<!-- Animate the Rect property of the RectangleGeometry which causes the
rectangle to animate its position as well as its width and height. -->
<RectAnimationUsingKeyFrames
Storyboard.TargetName="myRectangleGeometry"
Storyboard.TargetProperty ="Rect"
Duration="0:0:6" FillBehavior="HoldEnd" RepeatBehavior="Forever">
<!-- Animate position, width, and height in first 2 seconds. LinearRectKeyFrame creates
a smooth, linear animation between values. -->
<LinearRectKeyFrame Value="600,50,200,50" KeyTime="0:0:2" />
<!-- In the next half second, change height to 10. DiscreteRectKeyFrame creates a
sudden "jump" between values. -->
<DiscreteRectKeyFrame Value="600,50,200,10" KeyTime="0:0:2.5" />
<!-- In the final 2 seconds of the animation, go back to the starting position, width, and height.
Spline key frames like SplineRectKeyFrame 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.-->
<SplineRectKeyFrame Value="0,200,100,100" KeyTime="0:0:4.5" KeySpline="0.6,0.0 0.9,0.00" />
</RectAnimationUsingKeyFrames>
</Storyboard>
</BeginStoryboard>
</EventTrigger>
</Path.Triggers>
</Path>
</StackPanel>
</Page>
Das vollständige Beispiel finden Sie unter Beispiel für eine Keyframe-Animation.
Siehe auch
Referenz
Konzepte
Übersicht über Keyframe-Animationen