Andy De George
da363692ff
* Reset branch for WPF changes * Convert BMP to PNG; fix link-out-of-scope err * Add snippets for WPF... 6794 files!!!! * Add missing snippets * update file updated between migration * Fix paths to include * update breadcrumb and toc * fix index links * fix index links * fix index links * fix markdown
3.3 KiB
title, ms.date, helpviewer_keywords, ms.assetid
| title | ms.date | helpviewer_keywords | ms.assetid | |||
|---|---|---|---|---|---|---|
| How to: Specify the Origin of a Transform by Using Relative Values | 03/30/2017 |
|
f4dbc29d-93c7-41cd-96d8-5cfd8624b470 |
How to: Specify the Origin of a Transform by Using Relative Values
This example shows how to use relative values to specify the origin of a xref:System.Windows.UIElement.RenderTransform%2A that is applied to a xref:System.Windows.FrameworkElement.
When you rotate, scale, or skew a xref:System.Windows.FrameworkElement by using the xref:System.Windows.UIElement.RenderTransform%2A property, the default setting applies the transform to the upper-left corner of the element. If you want to rotate, scale, or skew from the center of the element, you can compensate by setting the center of the transform to the center of the element. However, that solution requires that you know the size of the element. An easier way of applying a transform to the center of an element is to set its xref:System.Windows.UIElement.RenderTransformOrigin%2A property to (0.5, 0.5), instead of setting a center value on the transform itself.
Example
The following example uses a xref:System.Windows.Media.RotateTransform to rotate a xref:System.Windows.Controls.Button 45 degrees clockwise. Because the example does not specify a center, the button rotates about the point (0, 0), which is its upper-left corner. The xref:System.Windows.Media.RotateTransform is applied to the xref:System.Windows.UIElement.RenderTransform%2A property.
The following illustration shows the transformation result for the example that follows.
A 45 degree clockwise rotation by using the RenderTransform property
[!code-xamlTransforms_snip#GraphicsMMRotateButtonExample1]
The following example also uses a xref:System.Windows.Media.RotateTransform to rotate a xref:System.Windows.Controls.Button 45 degrees clockwise; however, this example sets the xref:System.Windows.UIElement.RenderTransformOrigin%2A of the button to (0.5, 0.5). As a result, the rotation is applied to the center of the button instead of to the upper-left corner.
The following illustration shows the transformation result for the example that follows.
A 45 degree rotation by using the RenderTransform property with a RenderTransformOrigin of (0.5, 0.5)
[!code-xamlTransforms_snip#GraphicsMMRotateButtonExample2]
For more information about transforming xref:System.Windows.FrameworkElement objects, see the Transforms Overview.