DiscreteInt16KeyFrame Classe

Definizione

public ref class DiscreteInt16KeyFrame : System::Windows::Media::Animation::Int16KeyFrame

public class DiscreteInt16KeyFrame : System.Windows.Media.Animation.Int16KeyFrame

type DiscreteInt16KeyFrame = class
    inherit Int16KeyFrame

Public Class DiscreteInt16KeyFrame
Inherits Int16KeyFrame

Ereditarietà

Object

DispatcherObject

DependencyObject

Freezable

Int16KeyFrame

DiscreteInt16KeyFrame

Esempio

L'interpolazione di un'animazione descrive la modalità di transizione di un'animazione tra valori per la relativa durata. Selezionando il tipo di fotogramma chiave da usare con l'animazione, è possibile definire il metodo di interpolazione per tale segmento di fotogrammi chiave. Esistono tre diversi tipi di metodi di interpolazione: lineare, discreta e spline. In questo esempio viene usato un oggetto DoubleAnimationUsingKeyFrames per illustrare questi tipi di interpolazione.

Nell'esempio seguente vengono usati ognuno dei diversi metodi di interpolazione disponibili per la DoubleAnimationUsingKeyFrames classe per animare la posizione di un Rectangleoggetto .

1. Durante i primi tre secondi, usa un'istanza LinearDoubleKeyFrame della classe per spostare il rettangolo lungo un percorso a una frequenza costante dalla posizione iniziale alla posizione 500. Fotogrammi chiave lineari come LinearDoubleKeyFrame creare una transizione lineare uniforme tra i valori.

2. Alla fine del quarto secondo, usa un'istanza della DiscreteDoubleKeyFrame classe per spostare improvvisamente il rettangolo nella posizione successiva. Fotogrammi chiave discreti come DiscreteDoubleKeyFrame creare salti improvvisi tra valori. In questo esempio, il rettangolo si trova in corrispondenza della posizione iniziale e improvvisamente appare nella posizione 500.

3. Negli ultimi due secondi, usa un'istanza della SplineDoubleKeyFrame classe per spostare il rettangolo di nuovo nella posizione iniziale. Fotogrammi chiave spline come SplineDoubleKeyFrame creare una transizione variabile tra valori in base al valore della KeySpline proprietà. In questo esempio il rettangolo inizia spostandosi lentamente e quindi accelera in modo esponenziale verso la fine del segmento temporale

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

namespace Microsoft.Samples.KeyFrameExamples
{
    /// <summary>
    /// This example shows how to use the DoubleAnimationUsingKeyFrames class to
    /// animate the position of an object.
    /// Key frame animations enable you to create complex animations 
    /// by specifying multiple destination values
    /// and controlling the animation's interpolation method.
    /// </summary>
    public class AltDoubleAnimationUsingKeyFramesExample : Page
    {
        public AltDoubleAnimationUsingKeyFramesExample()
        {
            Title = "DoubleAnimationUsingKeyFrames Example";
            Background = Brushes.White;
            Margin = new Thickness(20);

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

            // Create a rectangle.
            Rectangle aRectangle = new Rectangle();
            aRectangle.Width = 100;
            aRectangle.Height = 100;
            aRectangle.Stroke = Brushes.Black;
            aRectangle.StrokeThickness = 5;

            // Create a Canvas to contain and
            // position the rectangle.
            Canvas containerCanvas = new Canvas();
            containerCanvas.Width = 610;
            containerCanvas.Height = 300;
            containerCanvas.Children.Add(aRectangle);
            Canvas.SetTop(aRectangle, 100);
            Canvas.SetLeft(aRectangle, 10);         

            // Create a TranslateTransform to 
            // move the rectangle.
            TranslateTransform animatedTranslateTransform = 
                new TranslateTransform();
            aRectangle.RenderTransform = animatedTranslateTransform;  

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

            // Create a DoubleAnimationUsingKeyFrames to
            // animate the TranslateTransform.
            DoubleAnimationUsingKeyFrames translationAnimation 
                = new DoubleAnimationUsingKeyFrames();
            translationAnimation.Duration = TimeSpan.FromSeconds(6);

            // Animate from the starting position to 500
            // over the first second using linear
            // interpolation.
            translationAnimation.KeyFrames.Add(
                new LinearDoubleKeyFrame(
                    500, // Target value (KeyValue)
                    KeyTime.FromTimeSpan(TimeSpan.FromSeconds(3))) // KeyTime
                );

            // Animate from 500 (the value of the previous key frame) 
            // to 400 at 4 seconds using discrete interpolation.
            // Because the interpolation is discrete, the rectangle will appear
            // to "jump" from 500 to 400.
            translationAnimation.KeyFrames.Add(
                new DiscreteDoubleKeyFrame(
                    400, // Target value (KeyValue)
                    KeyTime.FromTimeSpan(TimeSpan.FromSeconds(4))) // KeyTime
                );

            // Animate from 400 (the value of the previous key frame) to 0
            // over two seconds, starting at 4 seconds (the key time of the
            // last key frame) and ending at 6 seconds.
            translationAnimation.KeyFrames.Add(
                new SplineDoubleKeyFrame(
                    0, // Target value (KeyValue)
                    KeyTime.FromTimeSpan(TimeSpan.FromSeconds(6)), // KeyTime
                    new KeySpline(0.6,0.0,0.9,0.0) // KeySpline
                    )
                );

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

            // Set the animation to target the X property
            // of the object named "AnimatedTranslateTransform."
            Storyboard.SetTargetName(translationAnimation, "AnimatedTranslateTransform");
            Storyboard.SetTargetProperty(
                translationAnimation, new PropertyPath(TranslateTransform.XProperty));

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

            // Start the storyboard after the rectangle loads.
            aRectangle.Loaded += delegate(object sender, RoutedEventArgs e)
            {
                translationStoryboard.Begin(this);
            };

            Content = containerCanvas;
        }
    }
}

Imports System.Windows
Imports System.Windows.Controls
Imports System.Windows.Shapes
Imports System.Windows.Media.Animation
Imports System.Windows.Media

Namespace Microsoft.Samples.KeyFrameExamples
    ''' <summary>
    ''' This example shows how to use the DoubleAnimationUsingKeyFrames class to
    ''' animate the position of an object.
    ''' Key frame animations enable you to create complex animations 
    ''' by specifying multiple destination values
    ''' and controlling the animation's interpolation method.
    ''' </summary>
    Public Class AltDoubleAnimationUsingKeyFramesExample
        Inherits Page
        Public Sub New()
            Title = "DoubleAnimationUsingKeyFrames Example"
            Background = Brushes.White
            Margin = New Thickness(20)

            ' Create a NameScope for this page so that
            ' Storyboards can be used.
            NameScope.SetNameScope(Me, New NameScope())

            ' Create a rectangle.
            Dim aRectangle As New Rectangle()
            aRectangle.Width = 100
            aRectangle.Height = 100
            aRectangle.Stroke = Brushes.Black
            aRectangle.StrokeThickness = 5

            ' Create a Canvas to contain and
            ' position the rectangle.
            Dim containerCanvas As New Canvas()
            containerCanvas.Width = 610
            containerCanvas.Height = 300
            containerCanvas.Children.Add(aRectangle)
            Canvas.SetTop(aRectangle, 100)
            Canvas.SetLeft(aRectangle, 10)

            ' Create a TranslateTransform to 
            ' move the rectangle.
            Dim animatedTranslateTransform As New TranslateTransform()
            aRectangle.RenderTransform = animatedTranslateTransform

            ' Assign the TranslateTransform a name so that
            ' it can be targeted by a Storyboard.
            Me.RegisterName("AnimatedTranslateTransform", animatedTranslateTransform)

            ' Create a DoubleAnimationUsingKeyFrames to
            ' animate the TranslateTransform.
            Dim translationAnimation As New DoubleAnimationUsingKeyFrames()
            translationAnimation.Duration = TimeSpan.FromSeconds(6)

            ' Animate from the starting position to 500
            ' over the first second using linear
            ' interpolation.
            translationAnimation.KeyFrames.Add(New LinearDoubleKeyFrame(500, KeyTime.FromTimeSpan(TimeSpan.FromSeconds(3)))) ' KeyTime -  Target value (KeyValue)

            ' Animate from 500 (the value of the previous key frame) 
            ' to 400 at 4 seconds using discrete interpolation.
            ' Because the interpolation is discrete, the rectangle will appear
            ' to "jump" from 500 to 400.
            translationAnimation.KeyFrames.Add(New DiscreteDoubleKeyFrame(400, KeyTime.FromTimeSpan(TimeSpan.FromSeconds(4)))) ' KeyTime -  Target value (KeyValue)

            ' Animate from 400 (the value of the previous key frame) to 0
            ' over two seconds, starting at 4 seconds (the key time of the
            ' last key frame) and ending at 6 seconds.
            translationAnimation.KeyFrames.Add(New SplineDoubleKeyFrame(0, KeyTime.FromTimeSpan(TimeSpan.FromSeconds(6)), New KeySpline(0.6,0.0,0.9,0.0))) ' KeySpline -  KeyTime -  Target value (KeyValue)

            ' Set the animation to repeat forever. 
            translationAnimation.RepeatBehavior = RepeatBehavior.Forever

            ' Set the animation to target the X property
            ' of the object named "AnimatedTranslateTransform."
            Storyboard.SetTargetName(translationAnimation, "AnimatedTranslateTransform")
            Storyboard.SetTargetProperty(translationAnimation, New PropertyPath(TranslateTransform.XProperty))

            ' Create a storyboard to apply the animation.
            Dim translationStoryboard As New Storyboard()
            translationStoryboard.Children.Add(translationAnimation)

            ' Start the storyboard after the rectangle loads.
            AddHandler aRectangle.Loaded, Sub(sender As Object, e As RoutedEventArgs) translationStoryboard.Begin(Me)

            Content = containerCanvas
        End Sub

    End Class
End Namespace

<!-- This example shows how to use the DoubleAnimationUsingKeyFrames to 
     animate the position of an object. 
     Key frame animations enable you to create complex animations 
     by specifying multiple destination values
     and controlling the animation's interpolation method.
-->
<Page 
  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
  Title="DoubleAnimationUsingKeyFrames Example"
  Background="White" Margin="20">       
  <Canvas Width="610" Height="300">
  
    <!-- The position of this rectangle is animated using 
         a key frame animation. -->
    <Rectangle 
      Canvas.Top="100"
      Canvas.Left="10"
      Height="100"
      Width="100"
      Stroke="Black"
      StrokeThickness="5">
      <Rectangle.RenderTransform>
        <TranslateTransform x:Name="AnimatedTranslateTransform" />
      </Rectangle.RenderTransform>
      
      <Rectangle.Triggers>
        <EventTrigger RoutedEvent="Rectangle.Loaded">
          <BeginStoryboard>
            <Storyboard>

              <!-- Animate the TranslateTransform.X property using 3 KeyFrames
                   which animates the rectangle along a straight line. 
                   This animation repeats indefinitely. -->
              <DoubleAnimationUsingKeyFrames
                Storyboard.TargetName="AnimatedTranslateTransform"
                Storyboard.TargetProperty="X"
                Duration="0:0:6"
                RepeatBehavior="Forever">

                <!-- Using a LinearDoubleKeyFrame, the rectangle moves 
                     steadily from its starting position to 500 over 
                     the first 3 seconds.  -->
                <LinearDoubleKeyFrame Value="500" KeyTime="0:0:3" />

                <!-- Using a DiscreteDoubleKeyFrame, the rectangle suddenly 
                     appears at 400 after the fourth second of the animation. -->
                <DiscreteDoubleKeyFrame Value="400" KeyTime="0:0:4" />

                <!-- Using a SplineDoubleKeyFrame, the rectangle moves 
                     back to its starting point. The
                     animation starts out slowly at first and then speeds up. 
                     This KeyFrame ends after the 6th
                     second. -->
                <SplineDoubleKeyFrame KeySpline="0.6,0.0 0.9,0.00" Value="0" KeyTime="0:0:6" />
              </DoubleAnimationUsingKeyFrames>
            </Storyboard>
          </BeginStoryboard>
        </EventTrigger>
      </Rectangle.Triggers>
    </Rectangle>
  </Canvas>
</Page>

Non ogni <classe Type>AnimationUsingKeyFrames supporta tutti i metodi di interpolazione. Per altre informazioni, vedere Panoramica delle animazioni con fotogrammi chiave.

Commenti

Questa classe viene usata come parte di un Int16KeyFrameCollection insieme a per Int16AnimationUsingKeyFrames animare un Int16 valore di proprietà lungo un set di fotogrammi chiave.

Un fotogramma chiave definisce un segmento dell'oggetto Int16AnimationUsingKeyFrames a cui appartiene. Ogni fotogramma chiave ha una destinazione Value e un KeyTimeoggetto . Specifica KeyTime il momento in cui deve essere raggiunto il fotogramma Value chiave. Un fotogramma chiave anima dal valore di destinazione del fotogramma chiave precedente al proprio valore di destinazione. Inizia quando termina il fotogramma chiave precedente e termina quando viene raggiunto il tempo della chiave.

Fotogrammi chiave discreti come DiscreteInt16KeyFrame creare "salti" improvvisi tra valori (nessuna interpolazione). In altre parole, la proprietà animata non cambia fino a quando non viene raggiunto il tempo di chiave del fotogramma chiave, a quel punto la proprietà animata passa improvvisamente al valore di destinazione.

Costruttori

Proprietà

Metodi

Eventi

Implementazioni dell'interfaccia esplicita

Si applica a

Vedi anche

• Int16AnimationUsingKeyFrames
• Int16KeyFrameCollection