PDF Sharp-横向页面底部的水印

Question

我正在使用PDFSharp尝试在纵向PDF页面的底部添加一些文本，但是它总是垂直偏移，我将文本设置得越大，越接近页面底部，但是我想使用20号字体。如果我使用循环算出最大可能的尺寸，则水印将恰好位于页面底部。我尝试了许多不同的方法，但无法锻炼自己在做错的事情。]

   For Each Page As PdfPage In PDF.Pages
            Dim Graphics As XGraphics = XGraphics.FromPdfPage(Page, XGraphicsPdfPageOptions.Append)
            Dim FontSize As Integer = 20
            Dim Font As New XFont("Arial", FontSize, XFontStyle.Bold)
            Dim WaterMarkSize As XSize = Graphics.MeasureString(Watermark, Font)
            Dim Brush As New XSolidBrush(XColor.FromArgb(255, 255, 0, 0))

            If Page.Orientation = PdfSharp.PageOrientation.Portrait Then
                Graphics.DrawString(Watermark, Font, Brush, New XRect(0, Page.Height, Page.Width, 0), XStringFormats.BottomCenter)
            Else
                Page.Orientation = PageOrientation.Portrait
                Graphics.TranslateTransform(Page.Width.Value / 2, Page.Height.Value / 2)
                Graphics.RotateTransform(90)
                Graphics.TranslateTransform(-Page.Width.Value / 2, -Page.Height.Value / 2)

                Dim Format As New XStringFormat()
                Format.Alignment = XStringAlignment.Near
                Format.LineAlignment = XLineAlignment.Near
                Graphics.DrawString(Watermark, Font, Brush, New XPoint((Page.Width.Value - WaterMarkSize.Width) / 2, Page.Width.Value), Format)
            End If
    Next

结果.....

任何想法？

Answer 1

Y坐标应基于page.Height，而不是page.Width。