Graphics.TextContrast 属性

定义

命名空间:

System.Drawing

程序集:

System.Drawing.Common.dll

包:

System.Drawing.Common v8.0.0

Source:

Graphics.cs

获取或设置呈现文本的灰度校正值。

public:
 property int TextContrast { int get(); void set(int value); };

public int TextContrast { get; set; }

member this.TextContrast : int with get, set

Public Property TextContrast As Integer

属性值

Int32

用于呈现抗锯齿和 ClearType 文本的伽玛校正值。

示例

下面的代码示例演示如何使用 TextRenderingHint 和 TextContrast 属性。

此示例旨在与 Windows 窗体 一起使用。 将代码粘贴到窗体中，并在处理窗体的 Paint 事件时调用 ChangeTextRenderingHintAndTextContrast 方法，作为 ePaintEventArgs传递。

private:
   void ChangeTextRenderingHintAndTextContrast( PaintEventArgs^ e )
   {
      // Retrieve the graphics object.
      Graphics^ formGraphics = e->Graphics;

      // Declare a new font.
      System::Drawing::Font^ myFont = gcnew System::Drawing::Font( FontFamily::GenericSansSerif,20,FontStyle::Regular );

      // Set the TextRenderingHint property.
      formGraphics->TextRenderingHint = System::Drawing::Text::TextRenderingHint::SingleBitPerPixel;

      // Draw the string.
      formGraphics->DrawString( "Hello World", myFont, Brushes::Firebrick, 20.0F, 20.0F );

      // Change the TextRenderingHint property.
      formGraphics->TextRenderingHint = System::Drawing::Text::TextRenderingHint::AntiAliasGridFit;

      // Draw the string again.
      formGraphics->DrawString( "Hello World", myFont, Brushes::Firebrick, 20.0F, 60.0F );

      // Set the text contrast to a high-contrast setting.
      formGraphics->TextContrast = 0;

      // Draw the string.
      formGraphics->DrawString( "Hello World", myFont, Brushes::DodgerBlue, 20.0F, 100.0F );

      // Set the text contrast to a low-contrast setting.
      formGraphics->TextContrast = 12;

      // Draw the string again.
      formGraphics->DrawString( "Hello World", myFont, Brushes::DodgerBlue, 20.0F, 140.0F );

      // Dispose of the font object.
      delete myFont;
   }

private void ChangeTextRenderingHintAndTextContrast(PaintEventArgs e)
{

    // Retrieve the graphics object.
    Graphics formGraphics = e.Graphics;

    // Declare a new font.
    Font myFont = new Font(FontFamily.GenericSansSerif, 20, 
        FontStyle.Regular);

    // Set the TextRenderingHint property.
    formGraphics.TextRenderingHint = 
        System.Drawing.Text.TextRenderingHint.SingleBitPerPixel;

    // Draw the string.
    formGraphics.DrawString("Hello World", myFont, 
        Brushes.Firebrick, 20.0F, 20.0F);

    // Change the TextRenderingHint property.
    formGraphics.TextRenderingHint = 
        System.Drawing.Text.TextRenderingHint.AntiAliasGridFit;

    // Draw the string again.
    formGraphics.DrawString("Hello World", myFont, 
        Brushes.Firebrick, 20.0F, 60.0F);

    // Set the text contrast to a high-contrast setting.
    formGraphics.TextContrast = 0;

    // Draw the string.
    formGraphics.DrawString("Hello World", myFont, 
        Brushes.DodgerBlue, 20.0F, 100.0F);

    // Set the text contrast to a low-contrast setting.
    formGraphics.TextContrast = 12;

    // Draw the string again.
    formGraphics.DrawString("Hello World", myFont, 
        Brushes.DodgerBlue, 20.0F, 140.0F);

    // Dispose of the font object.
    myFont.Dispose();
}

Private Sub ChangeTextRenderingHintAndTextContrast(ByVal e As _
    PaintEventArgs)

    ' Retrieve the graphics object.
    Dim formGraphics As Graphics = e.Graphics

    ' Declare a new font.
    Dim myFont As Font = New Font(FontFamily.GenericSansSerif, _
        20, FontStyle.Regular)

    ' Set the TextRenderingHint property.
    formGraphics.TextRenderingHint = _
        System.Drawing.Text.TextRenderingHint.SingleBitPerPixel

    ' Draw the string.
    formGraphics.DrawString("Hello World", myFont, _
        Brushes.Firebrick, 20.0F, 20.0F)

    ' Change the TextRenderingHint property.
    formGraphics.TextRenderingHint = _
        System.Drawing.Text.TextRenderingHint.AntiAliasGridFit

    ' Draw the string again.
    formGraphics.DrawString("Hello World", myFont, _
        Brushes.Firebrick, 20.0F, 60.0F)

    ' Set the text contrast to a high-contrast setting.
    formGraphics.TextContrast = 0

    ' Draw the string.
    formGraphics.DrawString("Hello World", myFont, _
        Brushes.DodgerBlue, 20.0F, 100.0F)

    ' Set the text contrast to a low-contrast setting.
    formGraphics.TextContrast = 12

    ' Draw the string again.
    formGraphics.DrawString("Hello World", myFont, _
        Brushes.DodgerBlue, 20.0F, 140.0F)

    ' Dispose of the font object.
    myFont.Dispose()

End Sub

注解

伽玛校正值必须介于 0 和 12 之间。 默认值为 4。