Pen.DashPattern 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:

Pen.cs

获取或设置自定义的短划线和空白区域的数组。

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

public float[] DashPattern { get; set; }

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

Public Property DashPattern As Single()

属性值

Single[]

实数数组，指定虚线中交替出现的短划线和空白区域的长度。

例外

ArgumentException

对不可变的 DashPattern（比如由 Pen 类所返回）设置 Pens 属性。

示例

下面的代码示例演示了设置 DashCap、 DashPattern和 SmoothingMode 属性的效果。

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 ShowPensAndSmoothingMode 方法，作为 ePaintEventArgs传递。

private:
   void ShowPensAndSmoothingMode( PaintEventArgs^ e )
   {
      // Set the SmoothingMode property to smooth the line.
      e->Graphics->SmoothingMode = System::Drawing::Drawing2D::SmoothingMode::AntiAlias;

      // Create a new Pen object.
      Pen^ greenPen = gcnew Pen( Color::Green );

      // Set the width to 6.
      greenPen->Width = 6.0F;

      // Set the DashCap to round.
      greenPen->DashCap = System::Drawing::Drawing2D::DashCap::Round;

      // Create a custom dash pattern.
      array<Single>^temp0 = {4.0F,2.0F,1.0F,3.0F};
      greenPen->DashPattern = temp0;

      // Draw a line.
      e->Graphics->DrawLine( greenPen, 20.0F, 20.0F, 100.0F, 240.0F );

      // Change the SmoothingMode to none.
      e->Graphics->SmoothingMode = System::Drawing::Drawing2D::SmoothingMode::None;

      // Draw another line.
      e->Graphics->DrawLine( greenPen, 100.0F, 240.0F, 160.0F, 20.0F );

      // Dispose of the custom pen.
      delete greenPen;
   }

private void ShowPensAndSmoothingMode(PaintEventArgs e)
{

    // Set the SmoothingMode property to smooth the line.
    e.Graphics.SmoothingMode = 
        System.Drawing.Drawing2D.SmoothingMode.AntiAlias;

    // Create a new Pen object.
    Pen greenPen = new Pen(Color.Green);

    // Set the width to 6.
    greenPen.Width = 6.0F;

    // Set the DashCap to round.
    greenPen.DashCap = System.Drawing.Drawing2D.DashCap.Round;

    // Create a custom dash pattern.
    greenPen.DashPattern = new float[]{4.0F, 2.0F, 1.0F, 3.0F};

    // Draw a line.
    e.Graphics.DrawLine(greenPen, 20.0F, 20.0F, 100.0F, 240.0F);

    // Change the SmoothingMode to none.
    e.Graphics.SmoothingMode = 
        System.Drawing.Drawing2D.SmoothingMode.None;

    // Draw another line.
    e.Graphics.DrawLine(greenPen, 100.0F, 240.0F, 160.0F, 20.0F);

    // Dispose of the custom pen.
    greenPen.Dispose();
}

Private Sub ShowPensAndSmoothingMode(ByVal e As PaintEventArgs)

    ' Set the SmoothingMode property to smooth the line.
    e.Graphics.SmoothingMode = Drawing2D.SmoothingMode.AntiAlias

    ' Create a new Pen object.
    Dim greenPen As New Pen(Color.Green)

    ' Set the width to 6.
    greenPen.Width = 6.0F

    ' Set the DashCap to round.
    greenPen.DashCap = Drawing2D.DashCap.Round

    ' Create a custom dash pattern.
    greenPen.DashPattern = New Single() {4.0F, 2.0F, 1.0F, 3.0F}

    ' Draw a line.
    e.Graphics.DrawLine(greenPen, 20.0F, 20.0F, 100.0F, 240.0F)

    ' Change the SmoothingMode to none.
    e.Graphics.SmoothingMode = Drawing2D.SmoothingMode.None

    ' Draw another line.
    e.Graphics.DrawLine(greenPen, 100.0F, 240.0F, 160.0F, 20.0F)

    ' Dispose of the custom pen.
    greenPen.Dispose()
End Sub

注解

为此属性分配除 以外的null值会将此 Pen 的 属性设置为 DashStyleCustom。

数组中的 dashArray 元素设置短划线模式中每个短划线和空格的长度。 第一个元素设置短划线的长度，第二个元素设置空格的长度，第三个元素设置短划线的长度等。 因此，每个元素都应是一个非零正数。

短划线模式中每个短划线和空格的长度是 数组中元素值的乘积，以及 的 Pen宽度。