Visual.TransformToAncestor Method

public:
 System::Windows::Media::Media3D::GeneralTransform2DTo3D ^ TransformToAncestor(System::Windows::Media::Media3D::Visual3D ^ ancestor);

public System.Windows.Media.Media3D.GeneralTransform2DTo3D TransformToAncestor (System.Windows.Media.Media3D.Visual3D ancestor);

member this.TransformToAncestor : System.Windows.Media.Media3D.Visual3D -> System.Windows.Media.Media3D.GeneralTransform2DTo3D

Public Function TransformToAncestor (ancestor As Visual3D) As GeneralTransform2DTo3D

Parameters

Returns

A transform that can be used to transform coordinates from the Visual to the specified Visual3D ancestor of the visual object.

public:
 System::Windows::Media::GeneralTransform ^ TransformToAncestor(System::Windows::Media::Visual ^ ancestor);

public System.Windows.Media.GeneralTransform TransformToAncestor (System.Windows.Media.Visual ancestor);

member this.TransformToAncestor : System.Windows.Media.Visual -> System.Windows.Media.GeneralTransform

Public Function TransformToAncestor (ancestor As Visual) As GeneralTransform

Parameters

Returns

A value of type GeneralTransform.

Exceptions

Examples

The following markup example shows a TextBlock that is nested within two StackPanel objects.

<Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" >
  <StackPanel Margin="16">
    <StackPanel Margin="8">
      <TextBlock Name="myTextBlock" Margin="4" Text="Hello, world" />
    </StackPanel>
  </StackPanel>
</Window>

The following code example shows how to use the TransformToAncestor method to retrieve the offset of the TextBlock relative to the containing Window. The offset values are contained in the returned GeneralTransform.

// Return the general transform for the specified visual object.
GeneralTransform generalTransform1 = myTextBlock.TransformToAncestor(this);

// Retrieve the point value relative to the parent.
Point currentPoint = generalTransform1.Transform(new Point(0, 0));

' Return the general transform for the specified visual object.
Dim generalTransform1 As GeneralTransform = myTextBlock.TransformToAncestor(Me)

' Retrieve the point value relative to the parent.
Dim currentPoint As Point = generalTransform1.Transform(New Point(0, 0))

The offset takes into account the Margin values for all objects within the containing Window. In this case, X is 28, and Y is 28.

Remarks

Alternatively, you can use the VisualTreeHelper.GetOffset method to retrieve the offset of a visual object relative to its parent. The offset values are contained within the returned Vector value.

// Return the offset vector for the TextBlock object.
Vector vector = VisualTreeHelper.GetOffset(myTextBlock);

// Convert the vector to a point value.
Point currentPoint = new Point(vector.X, vector.Y);

' Return the offset vector for the TextBlock object.
Dim vector As Vector = VisualTreeHelper.GetOffset(myTextBlock)

' Convert the vector to a point value.
Dim currentPoint As New Point(vector.X, vector.Y)