How to: Animate an Object Along a Path (Double Animation)
This example shows how to use the DoubleAnimationUsingPath class to move an object along a path defined by a PathGeometry.
Example
The following example uses two DoubleAnimationUsingPath objects to move a rectangle along a geometric path:
The first DoubleAnimationUsingPath animates the X of the TranslateTransform applied to the rectangle. It makes the rectangle move horizontally along the path.
The second DoubleAnimationUsingPath animates the Y of the TranslateTransform applied to the rectangle. It makes the rectangle move vertically along the path.
<Page
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:PresentationOptions="http://schemas.microsoft.com/winfx/2006/xaml/presentation/options"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="PresentationOptions">
<Page.Resources>
<!-- This is the geometry creates the animation path. Because
this example uses it multiple times, it's declared as a resource and
frozen to improve performance. -->
<PathGeometry x:Key="AnimationPath"
Figures="M 10,100 C 35,0 135,0 160,100 180,190 285,200 310,100"
PresentationOptions:Freeze="True" />
</Page.Resources>
<Canvas Width="400" Height="400">
<!-- The object to animate. -->
<Rectangle
Width="30" Height="30" Fill="Blue">
<Rectangle.RenderTransform>
<TranslateTransform x:Name="AnimatedTranslateTransform" />
</Rectangle.RenderTransform>
<Rectangle.Triggers>
<EventTrigger RoutedEvent="Path.Loaded">
<BeginStoryboard>
<Storyboard RepeatBehavior="Forever">
<!-- Animates the rectangle horizotally along the path. -->
<DoubleAnimationUsingPath
Storyboard.TargetName="AnimatedTranslateTransform"
Storyboard.TargetProperty="X"
PathGeometry="{StaticResource AnimationPath}"
Source="X"
Duration="0:0:5" />
<!-- Animates the rectangle vertically along the path. -->
<DoubleAnimationUsingPath
Storyboard.TargetName="AnimatedTranslateTransform"
Storyboard.TargetProperty="Y"
PathGeometry="{StaticResource AnimationPath}"
Source="Y"
Duration="0:0:5" />
</Storyboard>
</BeginStoryboard>
</EventTrigger>
</Rectangle.Triggers>
</Rectangle>
</Canvas>
</Page>
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 DoubleAnimationUsingPathExample : Page
{
public DoubleAnimationUsingPathExample()
{
// Create a NameScope for the page so that
// we can use Storyboards.
NameScope.SetNameScope(this, new NameScope());
// Create a rectangle.
Rectangle aRectangle = new Rectangle();
aRectangle.Width = 30;
aRectangle.Height = 30;
aRectangle.Fill = Brushes.Blue;
// Create a transform. This transform
// will be used to move the rectangle.
TranslateTransform animatedTranslateTransform =
new TranslateTransform();
// Register the transform's name with the page
// so that they it be targeted by a Storyboard.
this.RegisterName("AnimatedTranslateTransform", animatedTranslateTransform);
aRectangle.RenderTransform = animatedTranslateTransform;
// Create a Canvas to contain the rectangle
// and add it to the page.
Canvas mainPanel = new Canvas();
mainPanel.Width = 400;
mainPanel.Height = 400;
mainPanel.Children.Add(aRectangle);
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 DoubleAnimationUsingPath to move the
// rectangle horizontally along the path by animating
// its TranslateTransform.
DoubleAnimationUsingPath translateXAnimation =
new DoubleAnimationUsingPath();
translateXAnimation.PathGeometry = animationPath;
translateXAnimation.Duration = TimeSpan.FromSeconds(5);
// Set the Source property to X. This makes
// the animation generate horizontal offset values from
// the path information.
translateXAnimation.Source = PathAnimationSource.X;
// Set the animation to target the X property
// of the TranslateTransform named "AnimatedTranslateTransform".
Storyboard.SetTargetName(translateXAnimation, "AnimatedTranslateTransform");
Storyboard.SetTargetProperty(translateXAnimation,
new PropertyPath(TranslateTransform.XProperty));
// Create a DoubleAnimationUsingPath to move the
// rectangle vertically along the path by animating
// its TranslateTransform.
DoubleAnimationUsingPath translateYAnimation =
new DoubleAnimationUsingPath();
translateYAnimation.PathGeometry = animationPath;
translateYAnimation.Duration = TimeSpan.FromSeconds(5);
// Set the Source property to Y. This makes
// the animation generate vertical offset values from
// the path information.
translateYAnimation.Source = PathAnimationSource.Y;
// Set the animation to target the Y property
// of the TranslateTransform named "AnimatedTranslateTransform".
Storyboard.SetTargetName(translateYAnimation, "AnimatedTranslateTransform");
Storyboard.SetTargetProperty(translateYAnimation,
new PropertyPath(TranslateTransform.YProperty));
// Create a Storyboard to contain and apply the animations.
Storyboard pathAnimationStoryboard = new Storyboard();
pathAnimationStoryboard.RepeatBehavior = RepeatBehavior.Forever;
pathAnimationStoryboard.Children.Add(translateXAnimation);
pathAnimationStoryboard.Children.Add(translateYAnimation);
// Start the animations when the rectangle is loaded.
aRectangle.Loaded += delegate(object sender, RoutedEventArgs e)
{
// Start the storyboard.
pathAnimationStoryboard.Begin(this);
};
}
}
}
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 DoubleAnimationUsingPathExample
Inherits Page
Public Sub New()
' Create a NameScope for the page so that
' we can use Storyboards.
NameScope.SetNameScope(Me, New NameScope())
' Create a rectangle.
Dim aRectangle As New Rectangle()
aRectangle.Width = 30
aRectangle.Height = 30
aRectangle.Fill = Brushes.Blue
' Create a transform. This transform
' will be used to move the rectangle.
Dim animatedTranslateTransform As New TranslateTransform()
' Register the transform's name with the page
' so that they it be targeted by a Storyboard.
Me.RegisterName("AnimatedTranslateTransform", animatedTranslateTransform)
aRectangle.RenderTransform = animatedTranslateTransform
' Create a Canvas to contain the rectangle
' and add it to the page.
Dim mainPanel As New Canvas()
mainPanel.Width = 400
mainPanel.Height = 400
mainPanel.Children.Add(aRectangle)
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 DoubleAnimationUsingPath to move the
' rectangle horizontally along the path by animating
' its TranslateTransform.
Dim translateXAnimation As New DoubleAnimationUsingPath()
translateXAnimation.PathGeometry = animationPath
translateXAnimation.Duration = TimeSpan.FromSeconds(5)
' Set the Source property to X. This makes
' the animation generate horizontal offset values from
' the path information.
translateXAnimation.Source = PathAnimationSource.X
' Set the animation to target the X property
' of the TranslateTransform named "AnimatedTranslateTransform".
Storyboard.SetTargetName(translateXAnimation, "AnimatedTranslateTransform")
Storyboard.SetTargetProperty(translateXAnimation, New PropertyPath(TranslateTransform.XProperty))
' Create a DoubleAnimationUsingPath to move the
' rectangle vertically along the path by animating
' its TranslateTransform.
Dim translateYAnimation As New DoubleAnimationUsingPath()
translateYAnimation.PathGeometry = animationPath
translateYAnimation.Duration = TimeSpan.FromSeconds(5)
' Set the Source property to Y. This makes
' the animation generate vertical offset values from
' the path information.
translateYAnimation.Source = PathAnimationSource.Y
' Set the animation to target the Y property
' of the TranslateTransform named "AnimatedTranslateTransform".
Storyboard.SetTargetName(translateYAnimation, "AnimatedTranslateTransform")
Storyboard.SetTargetProperty(translateYAnimation, New PropertyPath(TranslateTransform.YProperty))
' Create a Storyboard to contain and apply the animations.
Dim pathAnimationStoryboard As New Storyboard()
pathAnimationStoryboard.RepeatBehavior = RepeatBehavior.Forever
pathAnimationStoryboard.Children.Add(translateXAnimation)
pathAnimationStoryboard.Children.Add(translateYAnimation)
' Start the animations when the rectangle is loaded.
AddHandler aRectangle.Loaded, Sub(sender As Object, e As RoutedEventArgs) pathAnimationStoryboard.Begin(Me)
End Sub
End Class
End Namespace
For the complete sample, see Path Animation Sample.
Another way to move an object using a geometric path is to use a MatrixAnimationUsingPath object. For an example, see Animate an Object Along a Path (Matrix Animation).
See also
Collaborate with us on GitHub
The source for this content can be found on GitHub, where you can also create and review issues and pull requests. For more information, see our contributor guide.
.NET Desktop feedback