FontFamily.GetEmHeight(FontStyle) 方法

定义

命名空间:

System.Drawing

程序集:

System.Drawing.Common.dll

获取指定样式的 em 平方的高度（以字体设计单位为单位）。

public:
 int GetEmHeight(System::Drawing::FontStyle style);

public int GetEmHeight (System.Drawing.FontStyle style);

member this.GetEmHeight : System.Drawing.FontStyle -> int

Public Function GetEmHeight (style As FontStyle) As Integer

参数

style

FontStyle

要为其获取 em 高度的 FontStyle。

返回

Int32

em 平方的高度。

示例

下面的代码示例设计用于 Windows 窗体，它需要 PaintEventArgse，这是 Paint 事件处理程序的参数。 该代码执行以下操作：

• 创建 FontFamily。

• 获取该字体系列的 em 正方形高度。

• 将 em 高度的值作为文本绘制到屏幕。

public:
   void GetEmHeight_Example( PaintEventArgs^ e )
   {
      // Create a FontFamily object.
      FontFamily^ emFontFamily = gcnew FontFamily( "arial" );

      // Get the em height of the font family in design units.
      int emHeight = emFontFamily->GetEmHeight( FontStyle::Regular );

      // Draw the result as a string to the screen.
      e->Graphics->DrawString( String::Format( "emFontFamily.GetEmHeight() returns {0}.", emHeight ),
            gcnew System::Drawing::Font( emFontFamily,16 ), Brushes::Black, PointF(0,0) );
   }

public void GetEmHeight_Example(PaintEventArgs e)
{
    // Create a FontFamily object.
    FontFamily emFontFamily = new FontFamily("arial");
             
    // Get the em height of the font family in design units.
    int emHeight = emFontFamily.GetEmHeight(FontStyle.Regular);
             
    // Draw the result as a string to the screen.
    e.Graphics.DrawString(
        "emFontFamily.GetEmHeight() returns " + emHeight.ToString() + ".",
        new Font(emFontFamily, 16),
        Brushes.Black,
        new PointF(0, 0));
}

Public Sub GetEmHeight_Example(ByVal e As PaintEventArgs)

    ' Create a FontFamily object.
    Dim emFontFamily As New FontFamily("arial")

    ' Get the em height of the font family in design units.
    Dim emHeight As Integer = _
    emFontFamily.GetEmHeight(FontStyle.Regular)

    ' Draw the result as a string to the screen.
    e.Graphics.DrawString("emFontFamily.GetEmHeight() returns " & _
    emHeight.ToString() + ".", New Font(emFontFamily, 16), _
    Brushes.Black, New PointF(0, 0))
End Sub

注解

Em 正方形 是一个版式术语，是指字体最宽的字母（传统上为字母 M）占用的矩形。

另请参阅

• 如何：获取字体指标