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Ada Bar Codes
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The project Ada Bar Codes provides a package for generating
various types of bar codes, including 2D bar codes like the QR code,
on different output formats, such as PDF, SVG or bitmaps.

The creation of a bar code is as simple as this small procedure:

    with Ada.Text_IO, Bar_Codes, Bar_Codes_Media;

    procedure Small_Demo is
      use Ada.Text_IO;
      svg : File_Type;
    begin
      Create (svg, Out_File, "qr_code.svg");
      Put_Line
        (svg,
         Bar_Codes_Media.SVG_Bar_Code
           (Bar_Codes.Code_QR_Low, 100.0, 100.0, "mm", "Hello"));
      Close (svg);
    end Small_Demo;

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Full description in: ada_bar_codes.txt