/// <summary>
///
/// </summary>
/// <param name="page"></param>
private static void DrawWatermarkOverPageContent(PdfPage page)
{
PdfBrush redBrush = new PdfBrush(new PdfRgbColor(192, 0, 0));
PdfStandardFont helvetica = new PdfStandardFont(PdfStandardFontFace.HelveticaBold, 32);
// The page graphics is located by default on top of existing page content.
//page.SetGraphicsPosition(PdfPageGraphicsPosition.OverExistingPageContent);
// Draw the watermark over page content.
// Page content under the watermark will be masked.
page.Graphics.DrawString("Sample watermark over page content", helvetica, redBrush, 20, 335);
page.Graphics.SaveGraphicsState();
// Draw the watermark over page content but using the Multiply blend mode.
// The watermak will appear as if drawn under the page content, useful when watermarking scanned documents.
// If the watermark is drawn under page content for scanned documents, it will not be visible because the scanned image will block it.
PdfExtendedGraphicState gs1 = new PdfExtendedGraphicState();
gs1.BlendMode = PdfBlendMode.Multiply;
page.Graphics.SetExtendedGraphicState(gs1);
page.Graphics.DrawString("Sample watermark over page content", helvetica, redBrush, 20, 385);
// Draw the watermark over page content but using the Luminosity blend mode.
// Both the page content and the watermark will be visible.
PdfExtendedGraphicState gs2 = new PdfExtendedGraphicState();
gs2.BlendMode = PdfBlendMode.Luminosity;
page.Graphics.SetExtendedGraphicState(gs2);
page.Graphics.DrawString("Sample watermark over page content", helvetica, redBrush, 20, 435);
page.Graphics.RestoreGraphicsState();
}
/// <summary>
///
/// </summary>
/// <param name="page"></param>
private static void DrawWatermarkOverPageContent(PdfPage page)
{
PdfBrush redBrush = new PdfBrush(new PdfRgbColor(192, 0, 0));
PdfStandardFont helvetica = new PdfStandardFont(PdfStandardFontFace.HelveticaBold, 32);
// The page graphics is located by default on top of existing page content.
//page.SetGraphicsPosition(PdfPageGraphicsPosition.OverExistingPageContent);
// Draw the watermark over page content.
// Page content under the watermark will be masked.
page.Graphics.DrawString("Sample watermark over page content", helvetica, redBrush, 20, 335);
page.Graphics.SaveGraphicsState();
// Draw the watermark over page content but using the Multiply blend mode.
// The watermak will appear as if drawn under the page content, useful when watermarking scanned documents.
// If the watermark is drawn under page content for scanned documents, it will not be visible because the scanned image will block it.
PdfExtendedGraphicState gs1 = new PdfExtendedGraphicState();
gs1.BlendMode = PdfBlendMode.Multiply;
page.Graphics.SetExtendedGraphicState(gs1);
page.Graphics.DrawString("Sample watermark over page content", helvetica, redBrush, 20, 385);
// Draw the watermark over page content but using the Luminosity blend mode.
// Both the page content and the watermark will be visible.
PdfExtendedGraphicState gs2 = new PdfExtendedGraphicState();
gs2.BlendMode = PdfBlendMode.Luminosity;
page.Graphics.SetExtendedGraphicState(gs2);
page.Graphics.DrawString("Sample watermark over page content", helvetica, redBrush, 20, 435);
page.Graphics.RestoreGraphicsState();
}
/// <summary>
///
/// </summary>
/// <param name="page"></param>
private static void DrawWatermarkWithTransparency(PdfPage page)
{
PdfBrush redBrush = new PdfBrush(new PdfRgbColor(192, 0, 0));
PdfStandardFont helvetica = new PdfStandardFont(PdfStandardFontFace.HelveticaBold, 36);
// The page graphics is located by default on top of existing page content.
//page.SetGraphicsPosition(PdfPageGraphicsPosition.OverExistingPageContent);
page.Graphics.SaveGraphicsState();
PdfStringAppearanceOptions sao = new PdfStringAppearanceOptions();
sao.Brush = redBrush;
sao.Font = helvetica;
PdfStringLayoutOptions slo = new PdfStringLayoutOptions();
slo.X = 130;
slo.Y = 670;
slo.Rotation = 60;
// Draw the watermark over page content but setting the transparency to a value lower than 1.
// The page content will be partially visible through the watermark.
PdfExtendedGraphicState gs1 = new PdfExtendedGraphicState();
gs1.FillAlpha = 0.3;
page.Graphics.SetExtendedGraphicState(gs1);
page.Graphics.DrawString("Sample watermark over page content", sao, slo);
page.Graphics.RestoreGraphicsState();
}
/// <summary>
///
/// </summary>
/// <param name="page"></param>
private static void DrawWatermarkWithTransparency(PdfPage page)
{
PdfBrush redBrush = new PdfBrush(new PdfRgbColor(192, 0, 0));
PdfStandardFont helvetica = new PdfStandardFont(PdfStandardFontFace.HelveticaBold, 36);
// The page graphics is located by default on top of existing page content.
//page.SetGraphicsPosition(PdfPageGraphicsPosition.OverExistingPageContent);
page.Graphics.SaveGraphicsState();
PdfStringAppearanceOptions sao = new PdfStringAppearanceOptions();
sao.Brush = redBrush;
sao.Font = helvetica;
PdfStringLayoutOptions slo = new PdfStringLayoutOptions();
slo.X = 130;
slo.Y = 670;
slo.Rotation = 60;
// Draw the watermark over page content but setting the transparency to a value lower than 1.
// The page content will be partially visible through the watermark.
PdfExtendedGraphicState gs1 = new PdfExtendedGraphicState();
gs1.FillAlpha = 0.3;
page.Graphics.SetExtendedGraphicState(gs1);
page.Graphics.DrawString("Sample watermark over page content", sao, slo);
page.Graphics.RestoreGraphicsState();
}
