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Matrix.RotateAt Method (Single, PointF)

Applies a clockwise rotation to this Matrix around the point specified in the point parameter, and by prepending the rotation.

Namespace:  System.Drawing.Drawing2D
Assembly:  System.Drawing (in System.Drawing.dll)

public void RotateAt(
	float angle,
	PointF point
)

Parameters

angle
Type: System.Single

The angle (extent) of the rotation, in degrees.

point
Type: System.Drawing.PointF

A PointF that represents the center of the rotation.

The following code example demonstrates using a Matrix and the Transform method to rotate a string. This example is designed to be used with Windows Forms. Create a form and paste the following code into it. Call the DrawVerticalStringFromBottomUp method in the form's Paint event handler, passing e as PaintEventArgs.

public void DrawVerticalStringFromBottomUp(PaintEventArgs e)
{

    // Create the string to draw on the form. 
    string text = "Can you read this?";

    // Create a GraphicsPath.
    System.Drawing.Drawing2D.GraphicsPath path = 
        new System.Drawing.Drawing2D.GraphicsPath();

    // Add the string to the path; declare the font, font style, size, and 
    // vertical format for the string.
    path.AddString(text, this.Font.FontFamily, 1, 15, 
        new PointF(0.0F, 0.0F), 
        new StringFormat(StringFormatFlags.DirectionVertical));

    // Declare a matrix that will be used to rotate the text.
    System.Drawing.Drawing2D.Matrix rotateMatrix = 
        new System.Drawing.Drawing2D.Matrix();

    // Set the rotation angle and starting point for the text.
    rotateMatrix.RotateAt(180.0F, new PointF(10.0F, 100.0F));

    // Transform the text with the matrix.
    path.Transform(rotateMatrix);

    // Set the SmoothingMode to high quality for best readability.
    e.Graphics.SmoothingMode = 
        System.Drawing.Drawing2D.SmoothingMode.HighQuality;

    // Fill in the path to draw the string.
    e.Graphics.FillPath(Brushes.Red, path);

    // Dispose of the path.
    path.Dispose();

}

.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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