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Graphics.RotateTransform Method (Single)

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

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

public void RotateTransform(
	float angle
)

Parameters

angle
Type: System.Single

Angle of rotation in degrees.

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.

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.

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);
}

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1

.NET Framework Client Profile

Supported in: 4, 3.5 SP1
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