Gewusst wie: Animieren eines Objekts entlang eines Pfads (PointAnimation)
In diesem Beispiel wird die Verwendung eines PointAnimationUsingPath-Objekts zur Animation eines Point entlang eines gekrümmten Pfads erläutert.
Beispiel
Im folgenden Beispiel wird ein EllipseGeometry-Objekt entlang eines Pfads bewegt, der durch PathGeometry festgelegt ist. Die Center-Eigenschaft des EllipseGeometry-Objekts, die einen Point-Wert übernimmt, gibt dessen Position an. Um das EllipseGeometry-Objekt zu bewegen, animieren Sie die Center-Eigenschaft. Im Beispiel wird PointAnimationUsingPath verwendet, um die EllipseGeometry-Objekteigenschaft Center zu animieren.
<Page
xmlns="https://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="https://schemas.microsoft.com/winfx/2006/xaml"
xmlns:PresentationOptions="https://schemas.microsoft.com/winfx/2006/xaml/presentation/options"
xmlns:mc="https://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="PresentationOptions">
<Canvas Width="400" Height="400">
<Path Fill="Blue" Margin="15,15,15,15">
<Path.Data>
<!-- The EllipseGemetry specifies the shape and position of the Ellipse. The
Center property is animated, causing the Ellipse to animate across the screen-->
<EllipseGeometry x:Name="MyAnimatedEllipseGeometry"
Center="10,100" RadiusX="15" RadiusY="15" />
</Path.Data>
<Path.Triggers>
<EventTrigger RoutedEvent="Path.Loaded">
<BeginStoryboard Name="MyBeginStoryboard">
<Storyboard>
<!-- Animates the ellipse along the path. -->
<PointAnimationUsingPath
Storyboard.TargetName="MyAnimatedEllipseGeometry"
Storyboard.TargetProperty="Center"
Duration="0:0:5"
RepeatBehavior="Forever" >
<PointAnimationUsingPath.PathGeometry>
<PathGeometry
Figures="M 10,100 C 35,0 135,0 160,100 180,190 285,200 310,100"
PresentationOptions:Freeze="True" />
</PointAnimationUsingPath.PathGeometry>
</PointAnimationUsingPath>
</Storyboard>
</BeginStoryboard>
</EventTrigger>
</Path.Triggers>
</Path>
</Canvas>
</Page>
Imports System
Imports System.Windows
Imports System.Windows.Controls
Imports System.Windows.Media
Imports System.Windows.Media.Animation
Imports System.Windows.Navigation
Imports System.Windows.Shapes
Namespace SDKSample
Public Class PointAnimationUsingPathExample
Inherits Page
Public Sub New()
' Create a NameScope for the page so that
' we can use Storyboards.
NameScope.SetNameScope(Me, New NameScope())
' Create the EllipseGeometry to animate.
Dim animatedEllipseGeometry As New EllipseGeometry(New Point(10, 100), 15, 15)
' Register the EllipseGeometry's name with
' the page so that it can be targeted by a
' storyboard.
Me.RegisterName("AnimatedEllipseGeometry", animatedEllipseGeometry)
' Create a Path element to display the geometry.
Dim ellipsePath As New Path()
ellipsePath.Data = animatedEllipseGeometry
ellipsePath.Fill = Brushes.Blue
ellipsePath.Margin = New Thickness(15)
' Create a Canvas to contain ellipsePath
' and add it to the page.
Dim mainPanel As New Canvas()
mainPanel.Width = 400
mainPanel.Height = 400
mainPanel.Children.Add(ellipsePath)
Me.Content = mainPanel
' Create the animation path.
Dim animationPath As New PathGeometry()
Dim pFigure As New PathFigure()
pFigure.StartPoint = New Point(10, 100)
Dim pBezierSegment As New PolyBezierSegment()
pBezierSegment.Points.Add(New Point(35, 0))
pBezierSegment.Points.Add(New Point(135, 0))
pBezierSegment.Points.Add(New Point(160, 100))
pBezierSegment.Points.Add(New Point(180, 190))
pBezierSegment.Points.Add(New Point(285, 200))
pBezierSegment.Points.Add(New Point(310, 100))
pFigure.Segments.Add(pBezierSegment)
animationPath.Figures.Add(pFigure)
' Freeze the PathGeometry for performance benefits.
animationPath.Freeze()
' Create a PointAnimationgUsingPath to move
' the EllipseGeometry along the animation path.
Dim centerPointAnimation As New PointAnimationUsingPath()
centerPointAnimation.PathGeometry = animationPath
centerPointAnimation.Duration = TimeSpan.FromSeconds(5)
centerPointAnimation.RepeatBehavior = RepeatBehavior.Forever
' Set the animation to target the Center property
' of the EllipseGeometry named "AnimatedEllipseGeometry".
Storyboard.SetTargetName(centerPointAnimation, "AnimatedEllipseGeometry")
Storyboard.SetTargetProperty(centerPointAnimation, New PropertyPath(EllipseGeometry.CenterProperty))
' Create a Storyboard to contain and apply the animation.
Dim pathAnimationStoryboard As New Storyboard()
pathAnimationStoryboard.RepeatBehavior = RepeatBehavior.Forever
pathAnimationStoryboard.AutoReverse = True
pathAnimationStoryboard.Children.Add(centerPointAnimation)
' Start the Storyboard when ellipsePath is loaded.
AddHandler ellipsePath.Loaded, Sub(sender As Object, e As RoutedEventArgs) pathAnimationStoryboard.Begin(Me)
End Sub
End Class
End Namespace
using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Navigation;
using System.Windows.Shapes;
namespace SDKSample
{
public class PointAnimationUsingPathExample : Page
{
public PointAnimationUsingPathExample()
{
// Create a NameScope for the page so that
// we can use Storyboards.
NameScope.SetNameScope(this, new NameScope());
// Create the EllipseGeometry to animate.
EllipseGeometry animatedEllipseGeometry =
new EllipseGeometry(new Point(10, 100), 15, 15);
// Register the EllipseGeometry's name with
// the page so that it can be targeted by a
// storyboard.
this.RegisterName("AnimatedEllipseGeometry", animatedEllipseGeometry);
// Create a Path element to display the geometry.
Path ellipsePath = new Path();
ellipsePath.Data = animatedEllipseGeometry;
ellipsePath.Fill = Brushes.Blue;
ellipsePath.Margin = new Thickness(15);
// Create a Canvas to contain ellipsePath
// and add it to the page.
Canvas mainPanel = new Canvas();
mainPanel.Width = 400;
mainPanel.Height = 400;
mainPanel.Children.Add(ellipsePath);
this.Content = mainPanel;
// Create the animation path.
PathGeometry animationPath = new PathGeometry();
PathFigure pFigure = new PathFigure();
pFigure.StartPoint = new Point(10, 100);
PolyBezierSegment pBezierSegment = new PolyBezierSegment();
pBezierSegment.Points.Add(new Point(35, 0));
pBezierSegment.Points.Add(new Point(135, 0));
pBezierSegment.Points.Add(new Point(160, 100));
pBezierSegment.Points.Add(new Point(180, 190));
pBezierSegment.Points.Add(new Point(285, 200));
pBezierSegment.Points.Add(new Point(310, 100));
pFigure.Segments.Add(pBezierSegment);
animationPath.Figures.Add(pFigure);
// Freeze the PathGeometry for performance benefits.
animationPath.Freeze();
// Create a PointAnimationgUsingPath to move
// the EllipseGeometry along the animation path.
PointAnimationUsingPath centerPointAnimation =
new PointAnimationUsingPath();
centerPointAnimation.PathGeometry = animationPath;
centerPointAnimation.Duration = TimeSpan.FromSeconds(5);
centerPointAnimation.RepeatBehavior = RepeatBehavior.Forever;
// Set the animation to target the Center property
// of the EllipseGeometry named "AnimatedEllipseGeometry".
Storyboard.SetTargetName(centerPointAnimation, "AnimatedEllipseGeometry");
Storyboard.SetTargetProperty(centerPointAnimation,
new PropertyPath(EllipseGeometry.CenterProperty));
// Create a Storyboard to contain and apply the animation.
Storyboard pathAnimationStoryboard = new Storyboard();
pathAnimationStoryboard.RepeatBehavior = RepeatBehavior.Forever;
pathAnimationStoryboard.AutoReverse = true;
pathAnimationStoryboard.Children.Add(centerPointAnimation);
// Start the Storyboard when ellipsePath is loaded.
ellipsePath.Loaded += delegate(object sender, RoutedEventArgs e)
{
// Start the storyboard.
pathAnimationStoryboard.Begin(this);
};
}
}
}
Das vollständige Beispiel finden Sie unter Path Animation Sample.
In der Codeversion des vorhergehenden Beispiels wird ein Storyboard-Element zur Animation des EllipseGeometry-Elements verwendet, obwohl nur eine einzige Animation angewendet wurde. Ein Storyboard ist oft die einfachste Möglichkeit, mehrere Animationen anzuwenden, da diese vom selben Storyboard gesteuert werden können. Eine einfachere Möglichkeit, um bei Verwendung von Code eine einzelne Animation auf eine Eigenschaft anzuwenden, stellt jedoch die Verwendung der BeginAnimation-Methode dar. Ein Beispiel finden Sie unter Gewusst wie: Animieren einer Eigenschaft ohne Storyboard.