Como: Animar a Posição de um Objeto Usando PointAnimation

Artigo
08/25/2010

Este exemplo mostra como usar a classe PointAnimation para animar um objeto ao longo de um Path.

Exemplo

O exemplo a seguir move uma elipse ao longo de um Path a partir de um ponto na tela até outro. O exemplo anima a posição de um EllipseGeometry usando PointAnimation para animar a propriedade Center.

using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Shapes;
using System.Windows.Media.Animation;
using System.Windows.Media;

namespace SDKSamples
{
    // This example shows how to use PointAnimation to animate the
    // position of an ellipse by animating the Center property of an 
    // EllipseGeometry. PointAnimation is used because the Center property
    // takes a Point value.
    public class PointAnimationExample : Page
    {
        public PointAnimationExample()
        {

            // Create a NameScope for this page so that
            // Storyboards can be used.
            NameScope.SetNameScope(this, new NameScope());

            EllipseGeometry myEllipseGeometry = new EllipseGeometry();
            myEllipseGeometry.Center = new Point(200, 100);
            myEllipseGeometry.RadiusX = 15;
            myEllipseGeometry.RadiusY = 15;

            // Assign the EllipseGeometry a name so that
            // it can be targeted by a Storyboard.
            this.RegisterName(
                "MyAnimatedEllipseGeometry", myEllipseGeometry);

            Path myPath = new Path();
            myPath.Fill = Brushes.Blue;
            myPath.Margin = new Thickness(15);
            myPath.Data = myEllipseGeometry;

            PointAnimation myPointAnimation = new PointAnimation();
            myPointAnimation.Duration = TimeSpan.FromSeconds(2);

            // Set the animation to repeat forever. 
            myPointAnimation.RepeatBehavior = RepeatBehavior.Forever;

            // Set the From and To properties of the animation.
            myPointAnimation.From = new Point(200, 100);
            myPointAnimation.To = new Point(450, 250);

            // Set the animation to target the Center property
            // of the object named "MyAnimatedEllipseGeometry."
            Storyboard.SetTargetName(myPointAnimation, "MyAnimatedEllipseGeometry");
            Storyboard.SetTargetProperty(
                myPointAnimation, new PropertyPath(EllipseGeometry.CenterProperty));

            // Create a storyboard to apply the animation.
            Storyboard ellipseStoryboard = new Storyboard();
            ellipseStoryboard.Children.Add(myPointAnimation);

            // Start the storyboard when the Path loads.
            myPath.Loaded += delegate(object sender, RoutedEventArgs e)
            {
                ellipseStoryboard.Begin(this);
            };

            Canvas containerCanvas = new Canvas();
            containerCanvas.Children.Add(myPath);

            Content = containerCanvas;
        }

    }
}

<!-- This example shows how to use PointAnimation to animate the
position of an ellipse by animating the Center property of an 
EllipseGeometry. PointAnimation is used because the Center property
takes a Point value. -->
<Page  xmlns="https://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="https://schemas.microsoft.com/winfx/2006/xaml">
    <Canvas>
      <Path Fill="Blue" Margin="15,15,15,15">
        <Path.Data>

          <!-- Describes an ellipse. -->
          <EllipseGeometry x:Name="MyAnimatedEllipseGeometry"
            Center="200,100" RadiusX="15" RadiusY="15" />
        </Path.Data>
        <Path.Triggers>
          <EventTrigger RoutedEvent="Path.Loaded">
            <BeginStoryboard Name="MyBeginStoryboard">
              <Storyboard>

                <!-- Animate the Center property so that the ellipse animates from 
                one point on the screen to another. -->
                <PointAnimation
                Storyboard.TargetProperty="Center"
                Storyboard.TargetName="MyAnimatedEllipseGeometry"
                Duration="0:0:2" From="200,100" To="450,250" RepeatBehavior="Forever" />
              </Storyboard>
            </BeginStoryboard>
          </EventTrigger>
        </Path.Triggers>
      </Path>
    </Canvas>
</Page>

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Como: Animar a Posição de um Objeto Usando PointAnimation

Exemplo

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