{Create a rotated font based on the font object F}
function CreateRotatedFont(F : TFont; Angle : Integer) : hFont;
var
  LF: TLogFont;
begin
  FillChar(LF, SizeOf(LF), #0);
  with LF do
  begin
    lfHeight := F.Height;
    lfWidth := 0;
    lfEscapement := Angle*10;
    lfOrientation := 0;
    if fsBold in F.Style then
      lfWeight := FW_BOLD
    else
      lfWeight := FW_NORMAL;
    lfItalic := Byte(fsItalic in F.Style);
    lfUnderline := Byte(fsUnderline in F.Style);
    lfStrikeOut := Byte(fsStrikeOut in F.Style);
    lfCharSet := DEFAULT_CHARSET;
    StrPCopy(lfFaceName, F.name);
    lfQuality := DEFAULT_QUALITY;
    {everything else as default}
    lfOutPrecision := OUT_DEFAULT_PRECIS;
    lfClipPrecision := CLIP_DEFAULT_PRECIS;
    case F.Pitch of
      fpVariable: lfPitchAndFamily := VARIABLE_PITCH;
      fpFixed: lfPitchAndFamily := FIXED_PITCH;
      else
        lfPitchAndFamily := DEFAULT_PITCH;
    end;
  end;
  Result := CreateFontIndirect(LF);
end;

...

{create the rotated font}
if FontAngle <> 0 then
  Canvas.Font.Handle := CreateRotatedFont(Font, FontAngle);
...