Export (0) Print
Expand All

How to: Animate the Size of an ArcSegment

This example shows how to animate the Size property of an ArcSegment.

The following example creates an ArcSegment that animates its Size when it loads on the screen.

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

namespace SDKSamples
{
    public class SizeAnimationExample : Page
    {
        public SizeAnimationExample()
        {

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

            // Create an ArcSegment to define the geometry of the path. 
            // The Size property of this segment is animated.
            ArcSegment myArcSegment = new ArcSegment();
            myArcSegment.Size = new Size(90, 80);
            myArcSegment.SweepDirection = SweepDirection.Clockwise;
            myArcSegment.Point = new Point(500, 200);

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

            PathSegmentCollection myPathSegmentCollection = new PathSegmentCollection();
            myPathSegmentCollection.Add(myArcSegment);

            // Create a PathFigure to be used for the PathGeometry of myPath.
            PathFigure myPathFigure = new PathFigure();

            // Set the starting point for the PathFigure specifying that the 
            // geometry starts at point 100,200.
            myPathFigure.StartPoint = new Point(100, 200);

            myPathFigure.Segments = myPathSegmentCollection;

            PathFigureCollection myPathFigureCollection = new PathFigureCollection();
            myPathFigureCollection.Add(myPathFigure);

            PathGeometry myPathGeometry = new PathGeometry();
            myPathGeometry.Figures = myPathFigureCollection;

            // Create a path to draw a geometry with.
            Path myPath = new Path();
            myPath.Stroke = Brushes.Black;
            myPath.StrokeThickness = 1;

            // specify the shape of the path using the path geometry.
            myPath.Data = myPathGeometry;

            SizeAnimation mySizeAnimation = new SizeAnimation();
            mySizeAnimation.Duration = TimeSpan.FromSeconds(2);

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

            // Set the From and To properties of the animation.
            mySizeAnimation.From = new Size(90, 80);
            mySizeAnimation.To = new Size(200, 200);

            // Set the animation to target the Size property 
            // of the object named "myArcSegment."
            Storyboard.SetTargetName(mySizeAnimation, "myArcSegment");
            Storyboard.SetTargetProperty(
                mySizeAnimation, new PropertyPath(ArcSegment.SizeProperty));

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

            // 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;
        }
    }
}
<Page xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" >
    <Canvas HorizontalAlignment="Left" Margin="0" >

      <!-- Create an arc on the screen that animates its size when it loads. -->
      <Path Stroke="Black" StrokeThickness="2" >
        <Path.Data>
          <PathGeometry>
            <PathGeometry.Figures>
              <PathFigureCollection>
                <PathFigure StartPoint="100,200">
                  <PathFigure.Segments>
                    <PathSegmentCollection>
                      <ArcSegment x:Name="myArcSegment" Size="90,80" 
                      SweepDirection="Clockwise"  Point="500,200" />
                    </PathSegmentCollection>
                  </PathFigure.Segments>
                </PathFigure>
              </PathFigureCollection>
            </PathGeometry.Figures>
          </PathGeometry>
        </Path.Data>
        <Path.Triggers>
          <EventTrigger RoutedEvent="Path.Loaded">
            <BeginStoryboard Name="myBeginStoryBoard">
              <Storyboard>

                <!-- Animate the size of the ArcSegment to a width and height of 200. -->
                <SizeAnimation
                Storyboard.TargetName="myArcSegment"
                Storyboard.TargetProperty="Size"
                From="90,80"
                To="200,200"
                Duration="0:0:2" />

              </Storyboard>
            </BeginStoryboard>
          </EventTrigger>
        </Path.Triggers>
      </Path>
    </Canvas>

</Page>

For additional geometry and animation samples, see the Geometries Sample.

Show:
© 2014 Microsoft