Procedura: animare un oggetto Double utilizzando i fotogrammi chiave
In questo esempio viene illustrato come animare il valore di una proprietà che accetta un Double oggetto usando fotogrammi chiave.
Esempio
L'esempio seguente sposta un rettangolo in una schermata. Nell'esempio viene utilizzata la DoubleAnimationUsingKeyFrames classe per animare la X proprietà di un TranslateTransform oggetto applicato a un oggetto Rectangle. Questa animazione, ripetuta all'infinito, usa tre fotogrammi chiave nel modo seguente:
Durante i primi tre secondi, usa un'istanza della LinearDoubleKeyFrame classe per spostare il rettangolo lungo un percorso a una velocità costante dalla posizione iniziale alla posizione 500. Fotogrammi chiave lineari come LinearDoubleKeyFrame creare una transizione lineare uniforme tra valori.
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.
Negli ultimi due secondi, usa un'istanza della SplineDoubleKeyFrame classe per spostare nuovamente il rettangolo nella posizione iniziale. Fotogrammi chiave spline come SplineDoubleKeyFrame creare una transizione di variabile tra valori in base al valore della KeySpline proprietà. In questo esempio, il rettangolo inizia a spostarsi 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>
Per l'esempio completo, vedere Esempio di animazione con fotogrammi chiave.
Per coerenza con altri esempi di animazione, le versioni di codice di questo esempio usano un Storyboard oggetto per applicare .DoubleAnimationUsingKeyFrames In alternativa, quando si applica una singola animazione nel codice, è più semplice usare il BeginAnimation metodo anziché usare un oggetto Storyboard. Per un esempio, vedere Animare una proprietà senza utilizzare uno storyboard.
Vedi anche
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