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# Matrix.RotateAtPrepend Method

.NET Framework 3.0
Prepends a rotation of the specified angle at the specified point to this Matrix structure.

Namespace: System.Windows.Media
Assembly: WindowsBase (in windowsbase.dll)

```public void RotateAtPrepend (
double angle,
double centerX,
double centerY
)
```
```public void RotateAtPrepend (
double angle,
double centerX,
double centerY
)
```
```public function RotateAtPrepend (
angle : double,
centerX : double,
centerY : double
)
```
```You cannot use methods in XAML.
```

#### Parameters

angle

The rotation angle, in degrees.

centerX

The x-coordinate of the rotation center.

centerY

The y-coordinate of the rotation center.

In a composite transformation, the order of individual transformations is important. For example, if you first rotate, then scale, then translate, you get a different result than if you first translate, then rotate, then scale. One reason order is significant is that transformations like rotation and scaling are done with respect to the origin of the coordinate system. Scaling an object that is centered at the origin produces a different result than scaling an object that has been moved away from the origin. Similarly, rotating an object that is centered at the origin produces a different result than rotating an object that has been moved away from the origin.

The following example shows how to prepend a rotation to a Matrix.

```private Matrix prependRotateExample()
{

Matrix myMatrix = new Matrix(5, 10, 15, 20, 25, 30);

// Prepend a 90 degree rotation about the origin.
// myMatrix is now equal to  (15,20,-5,-10,25,30).
myMatrix.RotatePrepend(90);

return myMatrix;
}

{

Matrix myMatrix = new Matrix(5, 10, 15, 20, 25, 30);

// Prepend a 90 degree rotation about the
// point (100,100).
// myMatrix is now equal to  (15,20,-5,-10,1025,2030).
myMatrix.RotateAtPrepend(90, 100, 100);

return myMatrix;
}

```

Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

#### .NET Framework

Supported in: 3.0