THPDFPage.AddTextWatermark Method

Syntax

procedure AddTextWatermark(
  const Text    : WideString;
  X, Y          : Single;
  Angle         : Extended;
  Opacity       : Single;
  const FontName: AnsiString;
  FontStyle     : TFontStyles;
  FontSize      : Single;
  Color         : TColor);

Description

AddTextWatermark draws rotated transparent text on the current page. It registers an ExtGState with matching fill and stroke alpha, saves the current graphics state, applies the watermark font and fill color, emits the text, and restores the previous graphics state.

Opacity is clamped to the range 0..1. Values below 1 require PDF transparency support and are rejected by the same PDF/A and PDF/X profile gates used by RegisterExtGState. Use this method on generated pages or on pages selected after LoadFromFile and BeginDoc.

Example

PDF.LoadFromFile('Input.pdf');
PDF.FileName := 'Watermarked.pdf';
PDF.BeginDoc;
for I := 0 to PDF.PagesCount - 1 do
begin
  PDF.CurrentPageNumber := I;
  PDF.CurrentPage.AddTextWatermark(
    'CONFIDENTIAL', 105, 430, -35, 0.22, 'Arial', [fsBold], 56, clSilver);
end;
PDF.EndDoc;

See Also