Blend.Factors Property

Definition

Namespace:

System.Drawing.Drawing2D

Assembly:

System.Drawing.Common.dll

Source:

Blend.cs

Gets or sets an array of blend factors for the gradient.

public:
 property cli::array <float> ^ Factors { cli::array <float> ^ get(); void set(cli::array <float> ^ value); };

public float[] Factors { get; set; }

member this.Factors : single[] with get, set

Public Property Factors As Single()

Property Value

Single[]

An array of blend factors that specify the percentages of the starting color and the ending color to be used at the corresponding position.

Examples

The following code example demonstrates how to use the Blend class by setting the Factors and Positions properties. This example is designed to be used with Windows Forms. Paste the code into a form that imports the System.Drawing.Drawing2D namespace. Handle the form's Paint event and call the DemonstrateBlend method, passing e as PaintEventArgs.

private:
   void DemonstrateBlend( PaintEventArgs^ e )
   {
      Blend^ blend1 = gcnew Blend( 9 );

      // Set the values in the Factors array to be all green, 
      // go to all blue, and then go back to green.
      array<Single>^temp0 = {0.0F,0.2F,0.5F,0.7F,1.0F,0.7F,0.5F,0.2F,0.0F};
      blend1->Factors = temp0;

      // Set the positions.
      array<Single>^temp1 = {0.0F,0.1F,0.3F,0.4F,0.5F,0.6F,0.7F,0.8F,1.0F};
      blend1->Positions = temp1;

      // Declare a rectangle to draw the Blend in.
      Rectangle rectangle1 = Rectangle(10,10,120,100);

      // Create a new LinearGradientBrush using the rectangle, 
      // green and blue. and 90-degree angle.
      LinearGradientBrush^ brush1 = gcnew LinearGradientBrush( rectangle1,Color::LightGreen,Color::Blue,90,true );

      // Set the Blend property on the brush to the custom blend.
      brush1->Blend = blend1;

      // Fill in an ellipse with the brush.
      e->Graphics->FillEllipse( brush1, rectangle1 );

      // Dispose of the custom brush.
      delete brush1;
   }

private void DemonstrateBlend(PaintEventArgs e)
{
    Blend blend1 = new Blend(9);

    // Set the values in the Factors array to be all green, 
    // go to all blue, and then go back to green.
    blend1.Factors = new float[]{0.0F, 0.2F, 0.5F, 0.7F, 1.0F, 
                                    0.7F, 0.5F, 0.2F, 0.0F};

    // Set the positions.
    blend1.Positions = 
        new float[]{0.0F, 0.1F, 0.3F, 0.4F, 0.5F, 0.6F, 
        0.7F, 0.8F, 1.0F};

    // Declare a rectangle to draw the Blend in.
    Rectangle rectangle1 = new Rectangle(10, 10, 120, 100);

    // Create a new LinearGradientBrush using the rectangle, 
    // green and blue. and 90-degree angle.
    LinearGradientBrush brush1 = 
        new LinearGradientBrush(rectangle1, Color.LightGreen, 
        Color.Blue, 90, true);

    // Set the Blend property on the brush to the custom blend.
    brush1.Blend = blend1;

    // Fill in an ellipse with the brush.
    e.Graphics.FillEllipse(brush1, rectangle1);

    // Dispose of the custom brush.
    brush1.Dispose();
}

Private Sub DemonstrateBlend(ByVal e As PaintEventArgs)
    Dim blend1 As New Blend(9)

    ' Set the values in the Factors array to be all green, 
    ' go to all blue, and then go back to green.
    blend1.Factors = New Single() {0.0F, 0.2F, 0.5F, 0.7F, 1.0F, _
        0.7F, 0.5F, 0.2F, 0.0F}

    ' Set the positions.
    blend1.Positions = New Single() {0.0F, 0.1F, 0.3F, 0.4F, 0.5F, _
        0.6F, 0.7F, 0.8F, 1.0F}

    ' Declare a rectangle to draw the Blend in.
    Dim rectangle1 As New Rectangle(10, 10, 120, 100)

    ' Create a new LinearGradientBrush using the rectangle, 
    ' green and blue. and 90-degree angle.
    Dim brush1 As New LinearGradientBrush(rectangle1, _
        Color.LightGreen, Color.Blue, 90, True)

    ' Set the Blend property on the brush to the custom blend.
    brush1.Blend = blend1

    ' Fill in an ellipse with the brush.
    e.Graphics.FillEllipse(brush1, rectangle1)

    ' Dispose of the custom brush.
    brush1.Dispose()
End Sub

Remarks

Typically, the elements of this array are a value from 0.0f through 1.0f. These elements specify the percentages of the ending color and the starting color to use at the corresponding blend position. For example, a value of 0.2 indicates that at the specified position, the blended color is composed of 20 percent of the ending gradient color and 80 percent of the starting gradient color.