Ejemplo de código

program Rectangle;
{$APPTYPE CONSOLE}
uses
    SysUtils, Graphics, Classes, HPDFDoc;

var
    HPDF: THotPDF;

begin
    HPDF := THotPDF.Create(nil);
    try
        HPDF.AutoLaunch := true;                                 // PDF file will be shown automatically
        HPDF.FileName := '\Rectangle.pdf';                   // Set PDF filename
        HPDF.BeginDoc;                                               // Create PDF file

        HPDF.CurrentPage.SetGrayStrokeColor ( 0.252 ); // Set gray stroke color
        HPDF.CurrentPage.SetGrayFillColor ( 0.525 );       // Set gray fill color

        HPDF.CurrentPage.Rectangle( 10, 10, 100, 100 ); // Draw rectangle
        HPDF.CurrentPage.FillAndStroke;                       // and color fill and stroke

        HPDF.EndDoc;                                                  // Close PDF file
    finally
        HPDF.Free;
    end;
end.