# Matrix.RotateAt(Double, Double, Double) Method

## Definition

Important

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Rotates this matrix about the specified point.

```
public:
void RotateAt(double angle, double centerX, double centerY);
```

`public void RotateAt (double angle, double centerX, double centerY);`

`member this.RotateAt : double * double * double -> unit`

`Public Sub RotateAt (angle As Double, centerX As Double, centerY As Double)`

#### Parameters

- angle
- Double

The angle, in degrees, by which to rotate this matrix.

- centerX
- Double

The x-coordinate of the point about which to rotate this matrix.

- centerY
- Double

The y-coordinate of the point about which to rotate this matrix.

## Examples

The following example shows how to rotate a Matrix about a specified point.

```
private Matrix rotateAboutPointExample()
{
// Creating a Matrix structure.
Matrix myMatrix = new Matrix(5, 10, 15, 20, 25, 30);
// Rotate the matrix 90 degrees about the point (100,100).
// myMatrix becomes equal to (-10, 4, -20, 15, 170, 25).
myMatrix.RotateAt(90, 100, 100);
return myMatrix;
}
```