Comment : animer une rotation 3D à l'aide d'images clés (QuaternionAnimationUsingKeyFrames)
Dans l'exemple suivant, QuaternionAnimationUsingKeyFrames est utilisé pour faire pivoter un objet 3D. Cette animation utilise les images clés suivantes :
LinearRotation3DKeyFrame est utilisé pour créer une interpolation linéaire fluide entre les valeurs.
DiscreteRotation3DKeyFrame est utilisé pour créer des "sauts" soudains entre les valeurs (aucune interpolation).
SplineRotation3DKeyFrame est utilisé pour créer une transition variable entre les valeurs en fonction de la propriété KeySpline. Dans l'exemple ci-dessous, cette partie de l'animation commence lentement et accélère de façon exponentielle vers la fin du segment temporel.
Exemple
<Page xmlns="https://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="https://schemas.microsoft.com/winfx/2006/xaml" >
<DockPanel>
<Viewbox>
<Canvas Width="321" Height="201">
<!-- The Viewport3D provides a rendering surface for 3-D visual content. -->
<Viewport3D ClipToBounds="True" Width="150" Height="150"
Canvas.Left="0" Canvas.Top="10">
<!-- Defines the camera used to view the 3D object. -->
<Viewport3D.Camera>
<PerspectiveCamera x:Name="myPerspectiveCamera" Position="0,0,2" LookDirection="0,0,-1"
FieldOfView="60" />
</Viewport3D.Camera>
<!-- The ModelVisual3D children contain the 3D models -->
<Viewport3D.Children>
<!-- This ModelVisual3D defines the lights cast in the scene. Without light, the
3D object cannot be seen. Also, the direction of the lights affect shadowing. -->
<ModelVisual3D>
<ModelVisual3D.Content>
<DirectionalLight Color="#FFFFFF" Direction="-0.612372,-0.5,-0.612372" />
</ModelVisual3D.Content>
</ModelVisual3D>
<ModelVisual3D>
<ModelVisual3D.Content>
<GeometryModel3D>
<!-- The geometry specifes the shape of the 3D plane. In this case, a flat sheet is created. -->
<GeometryModel3D.Geometry>
<MeshGeometry3D
TriangleIndices="0,1,2 3,4,5 "
Normals="0,0,1 0,0,1 0,0,1 0,0,1 0,0,1 0,0,1 "
TextureCoordinates="0,0 1,0 1,1 1,1 0,1 0,0 "
Positions="-0.5,-0.5,0.5 0.5,-0.5,0.5 0.5,0.5,0.5 0.5,0.5,0.5 -0.5,0.5,0.5 -0.5,-0.5,0.5 " />
</GeometryModel3D.Geometry>
<!-- The material specifies the material applied to the plane. In this case it is a linear gradient.-->
<GeometryModel3D.Material>
<MaterialGroup>
<DiffuseMaterial>
<DiffuseMaterial.Brush>
<LinearGradientBrush StartPoint="0,0.5" EndPoint="1,0.5">
<LinearGradientBrush.GradientStops>
<GradientStop Color="Yellow" Offset="0" />
<GradientStop Color="Red" Offset="0.25" />
<GradientStop Color="Blue" Offset="0.75" />
<GradientStop Color="LimeGreen" Offset="1" />
</LinearGradientBrush.GradientStops>
</LinearGradientBrush>
</DiffuseMaterial.Brush>
</DiffuseMaterial>
</MaterialGroup>
</GeometryModel3D.Material>
<!-- The Transform specifies how to transform the 3D object. The rotation
is animated using the Storyboard below. -->
<GeometryModel3D.Transform>
<RotateTransform3D>
<RotateTransform3D.Rotation>
<QuaternionRotation3D x:Name="myQuaternionRotation3D" />
</RotateTransform3D.Rotation>
</RotateTransform3D>
</GeometryModel3D.Transform>
</GeometryModel3D>
</ModelVisual3D.Content>
</ModelVisual3D>
</Viewport3D.Children>
<!-- Trigger the rotation animation when the 3D object loads. -->
<Viewport3D.Triggers>
<EventTrigger RoutedEvent="Viewport3D.Loaded">
<BeginStoryboard>
<Storyboard>
<!-- This animation animates the Rotation property of the RotateTransform
causing the 3D shape to rotate and wobble as the rotation angle and
axis are animated. -->
<QuaternionAnimationUsingKeyFrames
Storyboard.TargetName="myQuaternionRotation3D"
Storyboard.TargetProperty="Quaternion" >
<QuaternionAnimationUsingKeyFrames.KeyFrames>
<!-- Using a LinearQuaternionKeyFrame, the 3D object gradually rotates from an askew
position to a flat position. -->
<LinearQuaternionKeyFrame KeyTime="0:0:1" Value="0,0,1,0" />
<!-- Using a DiscreteQuaternionKeyFrame, the object suddenly rotates to an askew
position. This happens immdeiately after the first 1 and a half seconds of the animation. -->
<DiscreteQuaternionKeyFrame KeyTime="0:0:1.5" Value="0.3, 0.3, 1, 0" />
<!-- Using a SplineQuaternionKeyFrame, the object rotates back to a flat position.
The animation starts out slowly at first and then speeds up. This KeyFrame ends
after the fourth second. -->
<SplineQuaternionKeyFrame KeySpline="0.6,0.0 0.9,0.00" KeyTime="0:0:4" Value="0,0,1,0" />
</QuaternionAnimationUsingKeyFrames.KeyFrames>
</QuaternionAnimationUsingKeyFrames>
</Storyboard>
</BeginStoryboard>
</EventTrigger>
</Viewport3D.Triggers>
</Viewport3D>
</Canvas>
</Viewbox>
</DockPanel>
</Page>
Voir aussi
Tâches
Comment : animer une rotation 3D à l'aide de storyboards
Comment : animer une rotation 3D à l'aide de Rotation3DAnimation
Comment : animer une rotation 3D à l'aide de quaternions
Comment : animer une rotation 3D à l'aide d'images clés