Draw centered and middle text with one char per line on canvas with Delphi

I need to draw text in the center of a box. The text must be drawn horizontally aligned with one char on each line.

I have attached an example with the string, "class".

I can draw the single char but I hope there is a faster way to do it.


procedure DrawVert(Canvas: TCanvas; Box: TRect; const Text: string);
  i: Integer;
  s: string;
  R: TRect;
  s := '';
  for i := 1 to Length(Text) do
    s := s + Text[i] + ' ';
  R := Rect(0, 0, 1, 0);
  Canvas.TextRect(R, s, [tfCalcRect, tfNoClip, tfWordBreak]);
  Box.Left := Box.Left + (Box.Right - Box.Left - R.Right) div 2;
  Box.Top := Box.Top + (Box.Bottom - Box.Top - R.Bottom) div 2;
  Box.Right := Box.Left + R.Right;
  Box.Bottom := Box.Top + R.Bottom;
  Canvas.TextRect(Box, s, [tfWordBreak]);

For testing, let PaintBox1 is the box we're painting on

procedure TForm1.Button1Click(Sender: TObject);
  DrawVert(PaintBox1.Canvas, PaintBox1.Canvas.ClipRect, 'CLASS TEST');

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