UIElement.RenderTransformOrigin 属性

定义

命名空间:

System.Windows

程序集:

PresentationCore.dll

获取或设置由 RenderTransform 声明的任何可能呈现转换的中心点，相对于元素的边界。 这是依赖项属性。

public:
 property System::Windows::Point RenderTransformOrigin { System::Windows::Point get(); void set(System::Windows::Point value); };

public System.Windows.Point RenderTransformOrigin { get; set; }

member this.RenderTransformOrigin : System.Windows.Point with get, set

Public Property RenderTransformOrigin As Point

属性值

Point

声明呈现转换的值。 默认值是一个坐标为 (0,0) 的 Point。

示例

以下示例在代码中生成元素，应用 RenderTransformOrigin，然后应用 RenderTransform。

public RotateAboutCenterExample()
{
    this.WindowTitle = "Rotate About Center Example";
    NameScope.SetNameScope(this, new NameScope());
    StackPanel myStackPanel = new StackPanel();
    myStackPanel.Margin = new Thickness(50);

    Button myButton = new Button();
    myButton.Name = "myRenderTransformButton";
    this.RegisterName(myButton.Name,myButton);
    myButton.RenderTransformOrigin = new Point(0.5,0.5);
    myButton.HorizontalAlignment = HorizontalAlignment.Left;
    myButton.Content = "Hello World";

    RotateTransform myRotateTransform = new RotateTransform(0);
    myButton.RenderTransform = myRotateTransform;
    this.RegisterName("MyAnimatedTransform",myRotateTransform);

    myStackPanel.Children.Add(myButton);

    //
    // Creates an animation that accelerates through 40% of its duration and
    //      decelerates through the 60% of its duration.
    //
    DoubleAnimation myRotateAboutCenterAnimation = new DoubleAnimation();
    Storyboard.SetTargetName(myRotateAboutCenterAnimation,"MyAnimatedTransform");
    Storyboard.SetTargetProperty(myRotateAboutCenterAnimation,new PropertyPath(RotateTransform.AngleProperty));
    myRotateAboutCenterAnimation.From = 0.0;
    myRotateAboutCenterAnimation.To = 360;
    myRotateAboutCenterAnimation.Duration = new Duration(TimeSpan.FromMilliseconds(1000));

    // Create a Storyboard to contain the animations and
    // add the animations to the Storyboard.
    Storyboard myStoryboard = new Storyboard();
    myStoryboard.Children.Add(myRotateAboutCenterAnimation);

    // Create an EventTrigger and a BeginStoryboard action to
    // start the storyboard.
    EventTrigger myEventTrigger = new EventTrigger();
    myEventTrigger.RoutedEvent = Button.ClickEvent;
    myEventTrigger.SourceName = myButton.Name;
    BeginStoryboard myBeginStoryboard = new BeginStoryboard();
    myBeginStoryboard.Storyboard = myStoryboard;
    myEventTrigger.Actions.Add(myBeginStoryboard);
    myStackPanel.Triggers.Add(myEventTrigger);

    this.Content = myStackPanel;
}

Public Sub New()
    Me.WindowTitle = "Rotate About Center Example"
    NameScope.SetNameScope(Me, New NameScope())
    Dim myStackPanel As New StackPanel()
    myStackPanel.Margin = New Thickness(50)

    Dim myButton As New Button()
    myButton.Name = "myRenderTransformButton"
    Me.RegisterName(myButton.Name,myButton)
    myButton.RenderTransformOrigin = New Point(0.5,0.5)
    myButton.HorizontalAlignment = HorizontalAlignment.Left
    myButton.Content = "Hello World"


    Dim myRotateTransform As New RotateTransform(0)
    myButton.RenderTransform = myRotateTransform
    Me.RegisterName("MyAnimatedTransform",myRotateTransform)

    myStackPanel.Children.Add(myButton)

    '
    ' Creates an animation that accelerates through 40% of its duration and
    '      decelerates through the 60% of its duration.
    '
    Dim myRotateAboutCenterAnimation As New DoubleAnimation()
    Storyboard.SetTargetName(myRotateAboutCenterAnimation,"MyAnimatedTransform")
    Storyboard.SetTargetProperty(myRotateAboutCenterAnimation,New PropertyPath(RotateTransform.AngleProperty))
    myRotateAboutCenterAnimation.From = 0.0
    myRotateAboutCenterAnimation.To = 360
    myRotateAboutCenterAnimation.Duration = New Duration(TimeSpan.FromMilliseconds(1000))

    ' Create a Storyboard to contain the animations and
    ' add the animations to the Storyboard.
    Dim myStoryboard As New Storyboard()
    myStoryboard.Children.Add(myRotateAboutCenterAnimation)

    ' Create an EventTrigger and a BeginStoryboard action to
    ' start the storyboard.
    Dim myEventTrigger As New EventTrigger()
    myEventTrigger.RoutedEvent = Button.ClickEvent
    myEventTrigger.SourceName = myButton.Name
    Dim myBeginStoryboard As New BeginStoryboard()
    myBeginStoryboard.Storyboard = myStoryboard
    myEventTrigger.Actions.Add(myBeginStoryboard)
    myStackPanel.Triggers.Add(myEventTrigger)

    Me.Content = myStackPanel
End Sub

注解

RenderTransformOrigin 结构值的使用 Point 有些非标准，即 Point 不表示坐标系中的绝对位置。 而是将介于 0 和 1 之间的值解释为每个 x，y 轴中当前元素范围的一个因子。 例如， (0.5，0.5) 将导致呈现转换在元素上居中，或者 (1，1) 会将呈现转换置于元素的右下角。 NaN 不是接受的值。

超过 0 和 1 的值也被接受，并将导致更非常规的转换效果。 例如，如果将 设置为 RenderTransformOrigin (5，5) ，然后应用 ， RotateTransform则旋转点将远远超出元素本身的边界。 转换将在源自右下角的大圆圈中旋转元素。 原点可能位于其父元素内的某个位置，并且可能位于框架或视图外。 负点值类似，这些值将超出左上角的边界。

呈现转换不会影响布局，通常用于对元素进行动画处理或应用临时效果。

XAML 属性用法

<object RenderTransformOrigin="xOrigin, yOrigin"/>  

XAML 属性元素用法

<object>  
  <object.RenderTransformOrigin>  
    <Point X=" xOrigin " Y=" yOrigin "/>  
  </object.RenderTransformOrigin>  
</object>  

XAML 值

xOrigin
水平原点因子。 这通常以介于 0 和 1 之间的值提供。 请参阅“备注”。

yOrigin
垂直原点因子。 这通常以介于 0 和 1 之间的值提供。 请参阅“备注”。

依赖项属性信息

标识符字段	RenderTransformOriginProperty
元数据属性设置为 true	无

另请参阅

• RenderTransform