Comment : faire pivoter un objet à l'aide d'un tracé géométrique
Cet exemple montre comment faire pivoter un objet le long d'un tracé géométrique défini par un objet PathGeometry.
Exemple
L'exemple suivant utilise trois objets DoubleAnimationUsingPath pour déplacer un rectangle le long d'un tracé géométrique.
Le premier DoubleAnimationUsingPath anime un RotateTransform appliqué au rectangle. L'animation génère des valeurs d'angle. Elle fait pivoter le rectangle sur les contours du tracé.
Les deux autres objets animent les valeurs X et Y d'un TranslateTransform appliqué au rectangle. Ils déplacent le rectangle horizontalement et verticalement sur le tracé.
<Page
xmlns="https://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="https://schemas.microsoft.com/winfx/2006/xaml"
xmlns:PresentationOptions="https://schemas.microsoft.com/winfx/2006/xaml/presentation/options"
xmlns:mc="https://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>
Imports System
Imports System.Windows
Imports System.Windows.Controls
Imports System.Windows.Media
Imports System.Windows.Media.Animation
Imports System.Windows.Navigation
Imports System.Windows.Shapes
Namespace SDKSample
Public Class RotateAnimationUsingPathExample
Inherits Page
Public Sub New()
' Create a NameScope for the page so that
' we can use Storyboards.
NameScope.SetNameScope(Me, New NameScope())
' Create a rectangle.
Dim aRectangle As 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.
Dim animatedRotateTransform As New RotateTransform()
Dim animatedTranslateTransform As New TranslateTransform()
' Register the transforms' names with the page
' so that they can be targeted by a Storyboard.
Me.RegisterName("AnimatedRotateTransform", animatedRotateTransform)
Me.RegisterName("AnimatedTranslateTransform", animatedTranslateTransform)
' Create a TransformGroup to contain the transforms
' and apply the TransformGroup to the rectangle.
Dim tGroup As 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.
Dim mainPanel As New Canvas()
mainPanel.Width = 400
mainPanel.Height = 400
mainPanel.Children.Add(aRectangle)
Me.Content = mainPanel
' Create the animation path.
Dim animationPath As New PathGeometry()
Dim pFigure As New PathFigure()
pFigure.StartPoint = New Point(10, 100)
Dim pBezierSegment As 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.
Dim angleAnimation As 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.
Dim translateXAnimation As 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.
Dim translateYAnimation As 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.
Dim pathAnimationStoryboard As 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.
AddHandler aRectangle.Loaded, Sub(sender As Object, e As RoutedEventArgs) pathAnimationStoryboard.Begin(Me)
End Sub
End Class
End Namespace
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);
};
}
}
}
Une autre façon de faire pivoter un objet à l'aide d'un tracé géométrique consiste à utiliser un objet MatrixAnimationUsingPath et affecter à sa propriété DoesRotateWithTangent la valeur true. Pour obtenir des informations supplémentaires et un exemple, consultez Comment : faire pivoter un objet à l'aide d'un tracé géométrique (animation de matrice).
Pour l'exemple complet, consultez Animation de tracés, exemple.
Voir aussi
Concepts
Autres ressources
Animation de tracé, exemple (page éventuellement en anglais)