Gewusst wie: Drehen eines Objekts mithilfe eines geometrischen Pfads (MatrixAnimation)
In diesem Beispiel wird dargestellt, wie eine MatrixAnimationUsingPath und eine MatrixTransform verwendet wird, um ein Objekt entlang eines geometrischen Pfads zu drehen bzw. zu schwenken, der durch ein PathGeometry-Objekt definiert wird.
Beispiel
Im folgenden Beispiel wird das MatrixAnimationUsingPath-Objekt verwendet, um die Matrix-Eigenschaft einer MatrixTransform zu animieren. Die MatrixTransform wird auf eine Schaltfläche angewendet und bewirkt, dass sie auf einem gekrümmten Pfad verschoben wird. Da die DoesRotateWithTangent-Eigenschaft auf true gesetzt ist, wird das Rechteck an der Tangente des Pfads entlang gedreht.
<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" Margin="20">
<Canvas Width="400" Height="400">
<!-- The Button that is animated across the screen by animating
the MatrixTransform applied to the button. -->
<Button MinWidth="100" Content="A Button">
<Button.RenderTransform>
<MatrixTransform x:Name="ButtonMatrixTransform">
<MatrixTransform.Matrix >
<Matrix />
</MatrixTransform.Matrix>
</MatrixTransform>
</Button.RenderTransform>
<Button.Triggers>
<EventTrigger RoutedEvent="Button.Loaded">
<BeginStoryboard>
<Storyboard>
<MatrixAnimationUsingPath
Storyboard.TargetName="ButtonMatrixTransform"
Storyboard.TargetProperty="Matrix"
DoesRotateWithTangent="True"
Duration="0:0:5"
RepeatBehavior="Forever" >
<MatrixAnimationUsingPath.PathGeometry>
<PathGeometry
Figures="M 10,100 C 35,0 135,0 160,100 180,190 285,200 310,100"
PresentationOptions:Freeze="True" />
</MatrixAnimationUsingPath.PathGeometry>
</MatrixAnimationUsingPath>
</Storyboard>
</BeginStoryboard>
</EventTrigger>
</Button.Triggers>
</Button>
</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
''' <summary>
''' Shows how to animate an object along
''' a geometric path.
''' </summary>
Public Class MatrixAnimationUsingPathDoesRotateWithTangentExample
Inherits Page
Public Sub New()
Me.Margin = New Thickness(20)
' Create a NameScope for the page so that
' we can use Storyboards.
NameScope.SetNameScope(Me, New NameScope())
' Create a button.
Dim aButton As New Button()
aButton.MinWidth = 100
aButton.Content = "A Button"
' Create a MatrixTransform. This transform
' will be used to move the button.
Dim buttonMatrixTransform As New MatrixTransform()
aButton.RenderTransform = buttonMatrixTransform
' Register the transform's name with the page
' so that it can be targeted by a Storyboard.
Me.RegisterName("ButtonMatrixTransform", buttonMatrixTransform)
' Create a Canvas to contain the button
' and add it to the page.
' Although this example uses a Canvas,
' any type of panel will work.
Dim mainPanel As New Canvas()
mainPanel.Width = 400
mainPanel.Height = 400
mainPanel.Children.Add(aButton)
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 MatrixAnimationUsingPath to move the
' button along the path by animating
' its MatrixTransform.
Dim matrixAnimation As New MatrixAnimationUsingPath()
matrixAnimation.PathGeometry = animationPath
matrixAnimation.Duration = TimeSpan.FromSeconds(5)
matrixAnimation.RepeatBehavior = RepeatBehavior.Forever
' Set the animation's DoesRotateWithTangent property
' to true so that rotates the rectangle in addition
' to moving it.
matrixAnimation.DoesRotateWithTangent = True
' Set the animation to target the Matrix property
' of the MatrixTransform named "ButtonMatrixTransform".
Storyboard.SetTargetName(matrixAnimation, "ButtonMatrixTransform")
Storyboard.SetTargetProperty(matrixAnimation, New PropertyPath(MatrixTransform.MatrixProperty))
' Create a Storyboard to contain and apply the animation.
Dim pathAnimationStoryboard As New Storyboard()
pathAnimationStoryboard.Children.Add(matrixAnimation)
' Start the storyboard when the button is loaded.
AddHandler aButton.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
{
/// <summary>
/// Shows how to animate an object along
/// a geometric path.
/// </summary>
public class MatrixAnimationUsingPathDoesRotateWithTangentExample : Page
{
public MatrixAnimationUsingPathDoesRotateWithTangentExample()
{
this.Margin = new Thickness(20);
// Create a NameScope for the page so that
// we can use Storyboards.
NameScope.SetNameScope(this, new NameScope());
// Create a button.
Button aButton = new Button();
aButton.MinWidth = 100;
aButton.Content = "A Button";
// Create a MatrixTransform. This transform
// will be used to move the button.
MatrixTransform buttonMatrixTransform = new MatrixTransform();
aButton.RenderTransform = buttonMatrixTransform;
// Register the transform's name with the page
// so that it can be targeted by a Storyboard.
this.RegisterName("ButtonMatrixTransform", buttonMatrixTransform);
// Create a Canvas to contain the button
// and add it to the page.
// Although this example uses a Canvas,
// any type of panel will work.
Canvas mainPanel = new Canvas();
mainPanel.Width = 400;
mainPanel.Height = 400;
mainPanel.Children.Add(aButton);
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 MatrixAnimationUsingPath to move the
// button along the path by animating
// its MatrixTransform.
MatrixAnimationUsingPath matrixAnimation =
new MatrixAnimationUsingPath();
matrixAnimation.PathGeometry = animationPath;
matrixAnimation.Duration = TimeSpan.FromSeconds(5);
matrixAnimation.RepeatBehavior = RepeatBehavior.Forever;
// Set the animation's DoesRotateWithTangent property
// to true so that rotates the rectangle in addition
// to moving it.
matrixAnimation.DoesRotateWithTangent = true;
// Set the animation to target the Matrix property
// of the MatrixTransform named "ButtonMatrixTransform".
Storyboard.SetTargetName(matrixAnimation, "ButtonMatrixTransform");
Storyboard.SetTargetProperty(matrixAnimation,
new PropertyPath(MatrixTransform.MatrixProperty));
// Create a Storyboard to contain and apply the animation.
Storyboard pathAnimationStoryboard = new Storyboard();
pathAnimationStoryboard.Children.Add(matrixAnimation);
// Start the storyboard when the button is loaded.
aButton.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. Einfacher ist es jedoch, zum Anwenden einer einzelnen Animation auf eine Eigenschaft im Code die BeginAnimation-Methode zu verwenden. Ein Beispiel finden Sie unter Gewusst wie: Animieren einer Eigenschaft ohne Storyboard.