Graphics.DrawString以printdocument宽度为中心

Question

我试图将一个字符串放在printdocument上.我用图像完成了以下操作并且它可以工作,但似乎对字符串不起作用.

这是我用来居中图像的代码

e.Graphics.DrawImage(logo, (e.MarginBounds.Width / 2) - (logo.Width / 2), height);

我试图中心的文本是从TabControl中的Tab提供的

 using (var sf = new StringFormat())
 {
       height = logo.Height + 15;
       sf.LineAlignment = StringAlignment.Center;
       sf.Alignment = StringAlignment.Center;
       e.Graphics.DrawString(tabData.Text, new Font(this.Font.Name, 10),
            new SolidBrush(tabData.ForeColor),
            (e.MarginBounds.Width / 2) - (txtData.Width / 2), height, sf);
  }

我也在下面尝试过并使用string_size.Width/2代替txtData.Width

SizeF string_size = e.Graphics.MeasureString(tabData.Text, tabData.Font);

编辑

目前的完整代码

        float height = 0;
        tabData.Text = "Date Range: 02/02/2010 - 08/09/2013"; //set just for testing
        using (var logo = Properties.Resources.title)
        {
            e.Graphics.DrawImage(logo, e.PageBounds.Left + (e.MarginBounds.Width / 2) - (logo.Width / 2), height);
            height = logo.Height + 15;
        }

        using (var sf = new StringFormat())
        {

            sf.LineAlignment = StringAlignment.Center;
            sf.Alignment = StringAlignment.Center;
            e.Graphics.DrawString(tabData.Text, new Font(this.Font.Name, 10), new SolidBrush(tabData.ForeColor), e.PageBounds.Left + (e.PageBounds.Width / 2), height, sf);
        }

不明白为什么我必须使用PageBounds和MarginBounds的混合来使Image居中,然后使用它将以MarginBounds或两个PageBounds为中心的文本

Answer 1

以下适用于我.PageBounds如果您的保证金不统一,您可能需要使用.

    void pd_PrintPage(object sender, PrintPageEventArgs e)
    {
        int w = e.MarginBounds.Width / 2;
        int x = e.MarginBounds.Left;
        int y = e.MarginBounds.Top;
        Font printFont = new Font("Arial", 10);
        Bitmap logo = System.Drawing.SystemIcons.WinLogo.ToBitmap();

        int height = 100 + y;
        string tabDataText = "Hello World";
        var tabDataForeColor = Color.Blue;
        var txtDataWidth = e.Graphics.MeasureString(tabDataText, printFont).Width;

        e.Graphics.DrawImage(logo,
            e.MarginBounds.Left + (e.MarginBounds.Width / 2) - (logo.Width / 2),
            e.MarginBounds.Top + (e.MarginBounds.Height / 2) - (logo.Height));

        using (var sf = new StringFormat())
        {
            height += logo.Height + 15;
            sf.LineAlignment = StringAlignment.Center;
            sf.Alignment = StringAlignment.Center;
            e.Graphics.DrawString(tabDataText, new Font(this.Font.Name, 10),
                 new SolidBrush(tabDataForeColor),
                 e.MarginBounds.Left + (e.MarginBounds.Width / 2),
                 e.MarginBounds.Top + (e.MarginBounds.Height / 2) + (logo.Height / 2) + 15,
                 sf);
        }

        e.HasMorePages = false;
    }

编辑响应

使用新代码输出.你是说这是你想要的吗？

或者你想要这个？

边距是位于页面内的矩形.这些边距可能是不对称的,所以如果你想要绝对中心,你应该参考PageBounds.

此外,您的文本是居中对齐的,这样就可以在文本字符串的中间而不是左上角绘制文本的参考点logo.