# Matrix::RotateAtPrepend Method

.NET Framework 4.5

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

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

## Syntax

```public:
void RotateAtPrepend(
double angle,
double centerX,
double centerY
)
```

#### Parameters

angle
Type: System::Double

The rotation angle, in degrees.

centerX
Type: System::Double

The x-coordinate of the rotation center.

centerY
Type: System::Double

The y-coordinate of the rotation center.

## Remarks

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.

## Examples

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;
}
```

## Version Information

#### .NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4, 3.5, 3.0

#### .NET Framework Client Profile

Supported in: 4, 3.5 SP1

## Platforms

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.