如何：对齐绘制的文本

  • 项目

执行自定义绘制时，通常可能希望将绘制的文本置于窗体或控件的中心。 通过创建正确的格式设置对象和设置适当的格式标志，可利用 DrawString 或 DrawText 方法轻松对齐绘制的文本。

使用 GDI+ (DrawString) 绘制居中文本

  1. 结合使用 StringFormat 和适当的 DrawString 方法使用来指定居中文本。

    string text1 = "Use StringFormat and Rectangle objects to"
    + " center text in a rectangle.";
using (Font font1 = new Font("Arial", 12, FontStyle.Bold, GraphicsUnit.Point))
{
    Rectangle rect1 = new Rectangle(10, 10, 130, 140);

    // Create a StringFormat object with the each line of text, and the block
    // of text centered on the page.
    StringFormat stringFormat = new StringFormat();
    stringFormat.Alignment = StringAlignment.Center;
    stringFormat.LineAlignment = StringAlignment.Center;

    // Draw the text and the surrounding rectangle.
    e.Graphics.DrawString(text1, font1, Brushes.Blue, rect1, stringFormat);
    e.Graphics.DrawRectangle(Pens.Black, rect1);
}

    Dim text1 As String = "Use StringFormat and Rectangle objects to" & _
    " center text in a rectangle."
Dim font1 As New Font("Arial", 12, FontStyle.Bold, GraphicsUnit.Point)
Try
    Dim rect1 As New Rectangle(10, 10, 130, 140)
    
    ' Create a StringFormat object with the each line of text, and the block
    ' of text centered on the page.
    Dim stringFormat As New StringFormat()
    stringFormat.Alignment = StringAlignment.Center
    stringFormat.LineAlignment = StringAlignment.Center
    
    ' Draw the text and the surrounding rectangle.
    e.Graphics.DrawString(text1, font1, Brushes.Blue, rect1, stringFormat)
    e.Graphics.DrawRectangle(Pens.Black, rect1)
Finally
    font1.Dispose()
End Try

使用 GDI (DrawText) 绘制居中文本

  1. 使用 TextFormatFlags 枚举进行换行，并使用适当的 DrawText 方法对文本进行垂直和水平居中。

    string text2 = "Use TextFormatFlags and Rectangle objects to"
 + " center text in a rectangle.";

using (Font font2 = new Font("Arial", 12, FontStyle.Bold, GraphicsUnit.Point))
{
    Rectangle rect2 = new Rectangle(150, 10, 130, 140);

    // Create a TextFormatFlags with word wrapping, horizontal center and
    // vertical center specified.
    TextFormatFlags flags = TextFormatFlags.HorizontalCenter |
        TextFormatFlags.VerticalCenter | TextFormatFlags.WordBreak;

    // Draw the text and the surrounding rectangle.
    TextRenderer.DrawText(e.Graphics, text2, font2, rect2, Color.Blue, flags);
    e.Graphics.DrawRectangle(Pens.Black, rect2);
}

    Dim text2 As String = "Use TextFormatFlags and Rectangle objects to" & _
        " center text in a rectangle."

Dim font2 As New Font("Arial", 12, FontStyle.Bold, GraphicsUnit.Point)
Try
    Dim rect2 As New Rectangle(150, 10, 130, 140)
    
    ' Create a TextFormatFlags with word wrapping, horizontal center and
    ' vertical center specified.
    Dim flags As TextFormatFlags = TextFormatFlags.HorizontalCenter Or _
        TextFormatFlags.VerticalCenter Or TextFormatFlags.WordBreak
    
    ' Draw the text and the surrounding rectangle.
    TextRenderer.DrawText(e.Graphics, text2, font2, rect2, Color.Blue, flags)
    e.Graphics.DrawRectangle(Pens.Black, rect2)
Finally
    font2.Dispose()
End Try

编译代码

前面的代码示例专用于 Windows 窗体，它们需要 PaintEventArgse，这是 PaintEventHandler 的参数。

另请参阅