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PDFsharp Sample: Watermark
Modified on 2018/07/11 11:27
by
Thomas Hövel
Categorized as
PDFsharp Samples
,
Samples
{s:navigationPrevUpNext|UnprotectDocument-sample|PDFsharpSamples|WorkOnPdfObjects-sample} This sample shows three variations how to add a watermark to an existing PDF file. {s:note}Technically the watermarks in this sample are simple graphical output. They have nothing to do with the Watermark Annotations introduced in PDF 1.6. ==PDF Output File== See the PDF file created by this sample: {s:PdfLink|Watermark-sample%2fWatermark-GDI.pdf|Watermark.pdf} (112 kB){br} This sample requires Acrobat Reader 5.0 or higher because it uses / demonstrates transparency. ==Screen Shots== Here are screen shots for the three variations of watermarks implemented in this sample (click image to enlarge): {s:ImageThumbLink|Draw watermark as text string|Watermark-sample%2fwatermark1th.png|Watermark-sample%2fwatermark1.png} {s:ImageThumbLink|Draw watermark as outlined graphical path|Watermark-sample%2fwatermark2th.png|Watermark-sample%2fwatermark2.png} {s:ImageThumbLink|Draw watermark as transparent graphical path above text|Watermark-sample%2fwatermark3th.png|Watermark-sample%2fwatermark3.png}{br} Click on the images to enlarge. ==Source Code== Here's the code that creates the first kind of watermarks: {s:beginCsharp} // Variation 1: Draw a watermark as a text string. // Get an XGraphics object for drawing beneath the existing content. var gfx = XGraphics.FromPdfPage(page, XGraphicsPdfPageOptions.Prepend); // Get the size (in points) of the text. var size = gfx.MeasureString(watermark, font); // Define a rotation transformation at the center of the page. gfx.TranslateTransform(page.Width / 2, page.Height / 2); gfx.RotateTransform(-Math.Atan(page.Height / page.Width) * 180 / Math.PI); gfx.TranslateTransform(-page.Width / 2, -page.Height / 2); // Create a string format. var format = new XStringFormat(); format.Alignment = XStringAlignment.Near; format.LineAlignment = XLineAlignment.Near; // Create a dimmed red brush. XBrush brush = new XSolidBrush(XColor.FromArgb(128, 255, 0, 0)); // Draw the string. gfx.DrawString(watermark, font, brush, new XPoint((page.Width - size.Width) / 2, (page.Height - size.Height) / 2), format); {s:endCsharp} Here's the code that creates the second kind of watermarks: {s:beginCsharp} // Variation 2: Draw a watermark as an outlined graphical path. // NYI: Does not work in Core build. // Get an XGraphics object for drawing beneath the existing content. var gfx = XGraphics.FromPdfPage(page, XGraphicsPdfPageOptions.Prepend); // Get the size (in points) of the text. var size = gfx.MeasureString(watermark, font); // Define a rotation transformation at the center of the page. gfx.TranslateTransform(page.Width / 2, page.Height / 2); gfx.RotateTransform(-Math.Atan(page.Height / page.Width) * 180 / Math.PI); gfx.TranslateTransform(-page.Width / 2, -page.Height / 2); // Create a graphical path. var path = new XGraphicsPath(); // Create a string format. var format = new XStringFormat(); format.Alignment = XStringAlignment.Near; format.LineAlignment = XLineAlignment.Near; // Add the text to the path. // AddString is not implemented in PDFsharp Core. path.AddString(watermark, font.FontFamily, XFontStyle.BoldItalic, 150, new XPoint((page.Width - size.Width) / 2, (page.Height - size.Height) / 2), format); // Create a dimmed red pen. var pen = new XPen(XColor.FromArgb(128, 255, 0, 0), 2); // Stroke the outline of the path. gfx.DrawPath(pen, path); {s:endCsharp} Here's the code that creates the third kind of watermarks: {s:beginCsharp} // Variation 3: Draw a watermark as a transparent graphical path above text. // NYI: Does not work in Core build. // Get an XGraphics object for drawing above the existing content. var gfx = XGraphics.FromPdfPage(page, XGraphicsPdfPageOptions.Append); // Get the size (in points) of the text. var size = gfx.MeasureString(watermark, font); // Define a rotation transformation at the center of the page. gfx.TranslateTransform(page.Width / 2, page.Height / 2); gfx.RotateTransform(-Math.Atan(page.Height / page.Width) * 180 / Math.PI); gfx.TranslateTransform(-page.Width / 2, -page.Height / 2); // Create a graphical path. var path = new XGraphicsPath(); // Create a string format. var format = new XStringFormat(); format.Alignment = XStringAlignment.Near; format.LineAlignment = XLineAlignment.Near; // Add the text to the path. // AddString is not implemented in PDFsharp Core. path.AddString(watermark, font.FontFamily, XFontStyle.BoldItalic, 150, new XPoint((page.Width - size.Width) / 2, (page.Height - size.Height) / 2), format); // Create a dimmed red pen and brush. var pen = new XPen(XColor.FromArgb(50, 75, 0, 130), 3); XBrush brush = new XSolidBrush(XColor.FromArgb(50, 106, 90, 205)); // Stroke the outline of the path. gfx.DrawPath(pen, brush, path); {s:endCsharp} {s:sampleSourceCode}
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