Напечатать миллиметровку

program PrnGrid;
 
uses
  Dialogs,
  Printers,
  Windows,
  Types;
 
{$R *.res}
 
function GetPenWidth(I: Integer): Integer;
begin
  if I mod 100 = 0 then
    Result := 45
  else if I mod 50 = 0 then
    Result := 30
  else if I mod 10 = 0 then
    Result := 20
  else if I mod 5 = 0 then
    Result := 15
  else
    Result := 10;
end;
 
var
  PageRect: TRect;
  I, J: Integer;
begin
  with TPrintDialog.Create(nil) do
  try
    if not Execute then
      Exit;
  finally
    Free;
  end;
 
  PageRect := Rect(0, 0, Printer.PageWidth, Printer.PageHeight);
  Printer.Title := 'Милиметровка';
  Printer.BeginDoc;
  try
    try
      with Printer.Canvas do
      begin
        SetMapMode(Handle, MM_HIMETRIC);
        DPtoLP(Handle, PageRect, 2);
 
        with PageRect do
        begin
         Inc(Left, 1000);
         Dec(Top, 1000);
         Dec(Right, 1000);
         Inc(Bottom, 1000);
        end;
 
        J := 0;
        I := PageRect.Left;
        while I < PageRect.Right  do
        begin
          Pen.Width := GetPenWidth(J);
          MoveTo(I, PageRect.Top);
          LineTo(I, PageRect.Bottom);
          Inc(I, 100);
          Inc(J);
        end;
 
        J := 0;
        I := PageRect.Top;
        while I > PageRect.Bottom do
        begin
          Pen.Width := GetPenWidth(J);
          MoveTo(PageRect.Left, I);
          LineTo(PageRect.Right, I);
          Dec(I, 100);
          Inc(J);
        end;
      end;
    except
      Printer.Abort;
      raise;
    end;
  finally
    Printer.EndDoc;
  end;
end.