Graphics.ScaleTransform Method

Definition

Namespace:

System.Drawing

Assembly:

System.Drawing.Common.dll

Applies the specified scaling operation to the transformation matrix of this Graphics by prepending it to the object's transformation matrix.

Overloads

ScaleTransform(Single, Single)	Applies the specified scaling operation to the transformation matrix of this Graphics by prepending it to the object's transformation matrix.
ScaleTransform(Single, Single, MatrixOrder)	Applies the specified scaling operation to the transformation matrix of this Graphics in the specified order.

ScaleTransform(Single, Single)

Applies the specified scaling operation to the transformation matrix of this Graphics by prepending it to the object's transformation matrix.

public:
 void ScaleTransform(float sx, float sy);

public void ScaleTransform (float sx, float sy);

member this.ScaleTransform : single * single -> unit

Public Sub ScaleTransform (sx As Single, sy As Single)

Parameters

sx

Single

Scale factor in the x direction.

sy

Single

Scale factor in the y direction.

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:

• Rotates the world transformation matrix of the Windows Form by 30 degrees.

• Scales that matrix by a factor of 3 in the x direction and a factor of 1 in the y direction by prepending the scaling transformation.

• Draws a scaled, rotated rectangle with a blue pen.

The result is still a rectangle.

public:
   void ScaleTransformFloat( PaintEventArgs^ e )
   {
      // Set world transform of graphics object to rotate.
      e->Graphics->RotateTransform( 30.0F );

      // Then to scale, prepending to world transform.
      e->Graphics->ScaleTransform( 3.0F, 1.0F );

      // Draw scaled, rotated rectangle to screen.
      e->Graphics->DrawRectangle( gcnew Pen( Color::Blue,3.0f ), 50, 0, 100, 40 );
   }

private void ScaleTransformFloat(PaintEventArgs e)
{

    // Set world transform of graphics object to rotate.
    e.Graphics.RotateTransform(30.0F);

    // Then to scale, prepending to world transform.
    e.Graphics.ScaleTransform(3.0F, 1.0F);

    // Draw scaled, rotated rectangle to screen.
    e.Graphics.DrawRectangle(new Pen(Color.Blue, 3), 50, 0, 100, 40);
}

Private Sub ScaleTransformFloat(ByVal e As PaintEventArgs)

    ' Set world transform of graphics object to rotate.
    e.Graphics.RotateTransform(30.0F)

    ' Then to scale, prepending to world transform.
    e.Graphics.ScaleTransform(3.0F, 1.0F)

    ' Draw scaled, rotated rectangle to screen.
    e.Graphics.DrawRectangle(New Pen(Color.Blue, 3), 50, 0, 100, 40)
End Sub

Remarks

The scaling operation consists of multiplying the transformation matrix by a diagonal matrix whose elements are (sx, sy, 1). This method prepends the transformation matrix of the Graphics by the scaling matrix.

ScaleTransform(Single, Single, MatrixOrder)

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

public:
 void ScaleTransform(float sx, float sy, System::Drawing::Drawing2D::MatrixOrder order);

public void ScaleTransform (float sx, float sy, System.Drawing.Drawing2D.MatrixOrder order);

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

Public Sub ScaleTransform (sx As Single, sy As Single, order As MatrixOrder)

Parameters

sx

Single

Scale factor in the x direction.

sy

Single

Scale factor in the y direction.

order

MatrixOrder

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

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:

• Rotates the world transformation matrix of the Windows Form by 30 degrees.

• Scales that matrix by a factor of 3 in the x direction and a factor of 1 in the y direction by appending the scaling transformation with the Append member.

• Draws a rotated, scaled rectangle with a blue pen.

The result is a parallelogram.

public:
   void ScaleTransformFloatMatrixOrder( PaintEventArgs^ e )
   {
      // Set world transform of graphics object to rotate.
      e->Graphics->RotateTransform( 30.0F );

      // Then to scale, appending to world transform.
      e->Graphics->ScaleTransform( 3.0F, 1.0F, MatrixOrder::Append );

      // Draw rotated, scaled rectangle to screen.
      e->Graphics->DrawRectangle( gcnew Pen( Color::Blue,3.0f ), 50, 0, 100, 40 );
   }

private void ScaleTransformFloatMatrixOrder(PaintEventArgs e)
{

    // Set world transform of graphics object to rotate.
    e.Graphics.RotateTransform(30.0F);

    // Then to scale, appending to world transform.
    e.Graphics.ScaleTransform(3.0F, 1.0F, MatrixOrder.Append);

    // Draw rotated, scaled rectangle to screen.
    e.Graphics.DrawRectangle(new Pen(Color.Blue, 3), 50, 0, 100, 40);
}

Private Sub ScaleTransformFloatMatrixOrder(ByVal e As PaintEventArgs)

    ' Set world transform of graphics object to rotate.
    e.Graphics.RotateTransform(30.0F)

    ' Then to scale, appending to world transform.
    e.Graphics.ScaleTransform(3.0F, 1.0F, MatrixOrder.Append)

    ' Draw rotated, scaled rectangle to screen.
    e.Graphics.DrawRectangle(New Pen(Color.Blue, 3), 50, 0, 100, 40)
End Sub

Remarks

The scaling operation consists of multiplying the transformation matrix by a diagonal matrix whose elements are (sx, sy, 1). This method prepends or appends the transformation matrix of the Graphics by the scaling matrix according to the order parameter.