# Matrix.RotatePrepend Method

.NET Framework 4

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

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

## Syntax

```public void RotatePrepend(
double angle
)
```

#### Parameters

angle
Type: System.Double
The angle of rotation to prepend.

## 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, 3.5, 3.0

#### .NET Framework Client Profile

Supported in: 4, 3.5 SP1

## Platforms

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

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