Region.Transform(Matrix) Method

Definition

Namespace:

System.Drawing

Assembly:

System.Drawing.Common.dll

Source:

Region.cs

Transforms this Region by the specified Matrix.

public:
 void Transform(System::Drawing::Drawing2D::Matrix ^ matrix);

public void Transform (System.Drawing.Drawing2D.Matrix matrix);

member this.Transform : System.Drawing.Drawing2D.Matrix -> unit

Public Sub Transform (matrix As Matrix)

Parameters

matrix

Matrix

The Matrix by which to transform this Region.

Exceptions

ArgumentNullException

matrix is null.

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:

• Creates a rectangle and draws it to the screen in blue.

• Creates a region from the rectangle.

• Creates a transformation matrix and sets it to 45 degrees.

• Applies the transformation to the region.

• Fills the transformed region with red and draws the transformed region to the screen in red.

Notice that the red rectangle is rotated 45 degrees from the original rectangle, shown in blue.

public:
   void TransformExample( PaintEventArgs^ e )
   {
      
      // Create the first rectangle and draw it to the screen in blue.
      Rectangle regionRect = Rectangle(100,50,100,100);
      e->Graphics->DrawRectangle( Pens::Blue, regionRect );
      
      // Create a region using the first rectangle.
      System::Drawing::Region^ myRegion = gcnew System::Drawing::Region( regionRect );
      
      // Create a transform matrix and set it to have a 45 degree
      // rotation.
      Matrix^ transformMatrix = gcnew Matrix;
      transformMatrix->RotateAt( 45, Point(100,50) );
      
      // Apply the transform to the region.
      myRegion->Transform(transformMatrix);
      
      // Fill the transformed region with red and draw it to the screen
      // in red.
      SolidBrush^ myBrush = gcnew SolidBrush( Color::Red );
      e->Graphics->FillRegion( myBrush, myRegion );
   }

public void TransformExample(PaintEventArgs e)
{
             
    // Create the first rectangle and draw it to the screen in blue.
    Rectangle regionRect = new Rectangle(100, 50, 100, 100);
    e.Graphics.DrawRectangle(Pens.Blue, regionRect);
             
    // Create a region using the first rectangle.
    Region myRegion = new Region(regionRect);
             
    // Create a transform matrix and set it to have a 45 degree
             
    // rotation.
    Matrix transformMatrix = new Matrix();
    transformMatrix.RotateAt(45, new Point(100, 50));
             
    // Apply the transform to the region.
    myRegion.Transform(transformMatrix);
             
    // Fill the transformed region with red and draw it to the screen
             
    // in red.
    SolidBrush myBrush = new SolidBrush(Color.Red);
    e.Graphics.FillRegion(myBrush, myRegion);
}

Public Sub TransformExample(ByVal e As PaintEventArgs)

    ' Create the first rectangle and draw it to the screen in blue.
    Dim regionRect As New Rectangle(100, 50, 100, 100)
    e.Graphics.DrawRectangle(Pens.Blue, regionRect)

    ' Create a region using the first rectangle.
    Dim myRegion As New [Region](regionRect)

    ' Create a transform matrix and set it to have a 45 degree
    ' rotation.
    Dim transformMatrix As New Matrix
    transformMatrix.RotateAt(45, New PointF(100, 50))

    ' Apply the transform to the region.
    myRegion.Transform(transformMatrix)

    ' Fill the transformed region with red and draw it to the
    ' screen in red.
    Dim myBrush As New SolidBrush(Color.Red)
    e.Graphics.FillRegion(myBrush, myRegion)
End Sub