Windows apps
Collapse the table of content
Expand the table of content
Information
The topic you requested is included in another documentation set. For convenience, it's displayed below. Choose Switch to see the topic in its original location.

How to: Rotate an Object by Using a Geometric Path

 

This example shows how to rotate (pivot) an object along a geometric path that is defined by a PathGeometry object.

The following example uses three DoubleAnimationUsingPath objects to move a rectangle along a geometric path.

  • The first DoubleAnimationUsingPath animates a RotateTransform that is applied to the rectangle. The animation generates angle values. It makes the rectangle rotate (pivot) along the contours of the path.

  • The other two objects animate the X and Y values of a TranslateTransform that is applied to the rectangle. They make the rectangle move horizontally and 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>
        <TransformGroup>
          <RotateTransform x:Name="AnimatedRotateTransform" />
          <TranslateTransform x:Name="AnimatedTranslateTransform"  />
        </TransformGroup>        
      </Rectangle.RenderTransform>   
  
      <Rectangle.Triggers>
        <EventTrigger RoutedEvent="Path.Loaded">
          <BeginStoryboard>
            <Storyboard RepeatBehavior="Forever" AutoReverse="True" >

              <!-- Generates angle values (in degrees) from
                   the path. This animation is used to
                   rotate the rectangle. -->
              <DoubleAnimationUsingPath
                Storyboard.TargetName="AnimatedRotateTransform"
                Storyboard.TargetProperty="Angle"
                PathGeometry="{StaticResource AnimationPath}"
                Source="Angle"
                Duration="0:0:5"  />

              <!-- Generates horizontal offset values from
                   the path. This animation is used to 
                   animate the rectangle horizontally. -->
              <DoubleAnimationUsingPath
                Storyboard.TargetName="AnimatedTranslateTransform"
                Storyboard.TargetProperty="X"
                PathGeometry="{StaticResource AnimationPath}"
                Source="X" 
                Duration="0:0:5"  />

              <!-- Generates vertical offset values from
                   the path. This animation is used to move
                   the rectangle vertically. -->
              <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 RotateAnimationUsingPathExample : Page
    {

        public RotateAnimationUsingPathExample()
        {

            // 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 some transforms. These transforms
            // will be used to move and rotate the rectangle.
            RotateTransform animatedRotateTransform = 
                new RotateTransform();
            TranslateTransform animatedTranslateTransform = 
                new TranslateTransform();

            // Register the transforms' names with the page
            // so that they can be targeted by a Storyboard.
            this.RegisterName("AnimatedRotateTransform", animatedRotateTransform);
            this.RegisterName("AnimatedTranslateTransform", animatedTranslateTransform);    

            // Create a TransformGroup to contain the transforms
            // and apply the TransformGroup to the rectangle.
            TransformGroup tGroup = new TransformGroup();
            tGroup.Children.Add(animatedRotateTransform);
            tGroup.Children.Add(animatedTranslateTransform);
            aRectangle.RenderTransform = tGroup;

            // 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 rotate the
            // rectangle with the path by animating 
            // its RotateTransform.
            DoubleAnimationUsingPath angleAnimation = 
                new DoubleAnimationUsingPath();
            angleAnimation.PathGeometry = animationPath;
            angleAnimation.Duration = TimeSpan.FromSeconds(5);

            // Set the Source property to Angle. This makes
            // the animation generate angle values from
            // the path information. 
            angleAnimation.Source = PathAnimationSource.Angle;

            // Set the animation to target the Angle property
            // of the RotateTransform named "AnimatedRotateTransform".
            Storyboard.SetTargetName(angleAnimation, "AnimatedRotateTransform");
            Storyboard.SetTargetProperty(angleAnimation, 
                new PropertyPath(RotateTransform.AngleProperty));

            // 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.AutoReverse = true;
            pathAnimationStoryboard.Children.Add(angleAnimation);
            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);
            };

        }
    
    }

}

Another way to rotate an object by using a geometric path is to use a MatrixAnimationUsingPath object and set its DoesRotateWithTangent property to true. For more information and an example, see Rotate an Object by Using a Geometric Path (Matrix Animation).

For the complete sample, see Path Animation Sample.

Animation Overview
Path Animation Sample
Path Animation How-to Topics

Show:
© 2017 Microsoft