Graphics.RotateTransform Method

Definition

Namespace:

System.Drawing

Assembly:

System.Drawing.Common.dll

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

Overloads

RotateTransform(Single, MatrixOrder)	Applies the specified rotation to the transformation matrix of this Graphics in the specified order.
RotateTransform(Single)	Applies the specified rotation to the transformation matrix of this Graphics.

RotateTransform(Single, MatrixOrder)

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

public:
 void RotateTransform(float angle, System::Drawing::Drawing2D::MatrixOrder order);

public void RotateTransform (float angle, System.Drawing.Drawing2D.MatrixOrder order);

member this.RotateTransform : single * System.Drawing.Drawing2D.MatrixOrder -> unit

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

Parameters

angle

Single

Angle of rotation in degrees.

order

MatrixOrder

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

Examples

The following code example is designed for use with Windows Forms, and it requires PaintEventArgs e, 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.

public:
   void RotateTransformAngleMatrixOrder( PaintEventArgs^ e )
   {
      // 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( gcnew Pen( Color::Blue,3.0f ), 0, 0, 200, 80 );
   }

private void RotateTransformAngleMatrixOrder(PaintEventArgs e)
{

    // 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);
}

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

Remarks

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.

RotateTransform(Single)

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

public:
 void RotateTransform(float angle);

public void RotateTransform (float angle);

member this.RotateTransform : single -> unit

Public Sub RotateTransform (angle As Single)

Parameters

angle

Single

Angle of rotation in degrees.

Examples

The following code example is designed for use with Windows Forms, and it requires PaintEventArgs e, 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 transformation by an angle of 30 degrees, prepending the rotation matrix to the world transformation matrix.

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

public:
   void RotateTransformAngle( PaintEventArgs^ e )
   {
      // Set world transform of graphics object to translate.
      e->Graphics->TranslateTransform( 100.0F, 0.0F );

      // Then to rotate, prepending rotation matrix.
      e->Graphics->RotateTransform( 30.0F );

      // Draw rotated, translated ellipse to screen.
      e->Graphics->DrawEllipse( gcnew Pen( Color::Blue,3.0f ), 0, 0, 200, 80 );
   }

private void RotateTransformAngle(PaintEventArgs e)
{

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

    // Then to rotate, prepending rotation matrix.
    e.Graphics.RotateTransform(30.0F);

    // Draw rotated, translated ellipse to screen.
    e.Graphics.DrawEllipse(new Pen(Color.Blue, 3), 0, 0, 200, 80);
}

Private Sub RotateTransformAngle(ByVal e As PaintEventArgs)

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

    ' Then to rotate, prepending rotation matrix.
    e.Graphics.RotateTransform(30.0F)

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

Remarks

The rotation operation consists of multiplying the transformation matrix by a matrix whose elements are derived from the angle parameter. This method applies the rotation by prepending it to the transformation matrix.