Graphics.RotateTransform Method (Single, MatrixOrder)

 

Applies the specified rotation to the transformation matrix of this Graphics in the specified order.

Namespace:   System.Drawing
Assembly:  System.Drawing (in System.Drawing.dll)

Public Sub RotateTransform (
	angle As Single,
	order As MatrixOrder
)

Parameters

angle
Type: System.Single

Angle of rotation in degrees.

order
Type: System.Drawing.Drawing2D.MatrixOrder

Member of the MatrixOrder enumeration that specifies whether the rotation is appended or prepended to the matrix transformation.

The rotation operation consists of multiplying the transformation matrix by a matrix whose elements are derived from the angle parameter. This method prepends or appends the transformation matrix of the Graphics by the rotation matrix according to the order parameter.

The following code example is designed for use with Windows Forms, and it requires PaintEventArgse, which is a parameter of the Paint event handler. The code performs the following actions:

  • Translates the world transformation matrix of the Windows Form by the vector (100, 0).

  • Rotates the world transform by an angle of 30 degrees, appending the rotation matrix to the world transformation matrix with Append.

  • Draws a translated, rotated ellipse with a blue pen.

Private Sub RotateTransformAngleMatrixOrder(ByVal e As PaintEventArgs)

    ' Set world transform of graphics object to translate.
    e.Graphics.TranslateTransform(100.0F, 0.0F)

    ' Then to rotate, appending rotation matrix.
    e.Graphics.RotateTransform(30.0F, MatrixOrder.Append)

    ' Draw translated, rotated ellipse to screen.
    e.Graphics.DrawEllipse(New Pen(Color.Blue, 3), 0, 0, 200, 80)
End Sub

.NET Framework
Available since 1.1
Return to top
Show: