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Matrix.TransformPoints Method (Point[])

Applies the geometric transform represented by this Matrix to a specified array of points.

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

public void TransformPoints(
	Point[] pts


Type: System.Drawing.Point[]

An array of Point structures that represents the points to transform.

The following code example is designed for use with Windows Forms, and it requires PaintEventArgs e, an Paint event object. The code performs the following actions:

  • Creates an array of points that form a rectangle.

  • Draws this array of points (to the screen prior to applying a scaling transform (the blue rectangle).

  • Creates a matrix and scales it by 3 in the x-axis and 2 in the y-axis.

  • Applies this matrix transform to the array of points.

  • Draws the transformed array to the screen (the red rectangle).

Notice that the red rectangle has been scaled by a factor of 3 in the x-axis and by 2 in the y-axis, including the upper left-hand corner of the rectangle (the beginning point of the rectangle).

public void TransformPointsExample(PaintEventArgs e)
    Pen myPen = new Pen(Color.Blue, 1);
    Pen myPen2 = new Pen(Color.Red, 1);

    // Create an array of points.
    Point[] myArray =
                 new Point(20, 20),
                 new Point(120, 20),
                 new Point(120, 120),
                 new Point(20, 120),
                 new Point(20,20)

    // Draw the Points to the screen before applying the 
    // transform.
    e.Graphics.DrawLines(myPen, myArray);

    // Create a matrix and scale it.
    Matrix myMatrix = new Matrix();
    myMatrix.Scale(3, 2, MatrixOrder.Append);

    // Draw the Points to the screen again after applying the 
    // transform.
    e.Graphics.DrawLines(myPen2, myArray);

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0