Is this some sort of glissando ?

[phil . auclair]

Hi,

I have come across a notation I'm not sure I understand.
The time signature is 6/8. The measure contains two dotted halves connected 
with a double beam. This may be a glissando, with length one dotted half, and 
pitch beginning with the first note and ending with the second. Could this be 
right? If so, how can I compose it with real Lilypond notation, instead of this 
horrible PostScript?

(The file is called helene.pdf because the music is from Offenbach's "La Belle 
Helene")

Regards,
Philippe


\include "italiano.ly"
\version "2.13.0"

\score {
  \new Staff = "pianoRight" \relative do'' {
    \key la \major
    \time 6/8

    \override TupletBracket #'bracket-visibility =  ##f
    \override TupletNumber #'stencil = ##f
    \times 3/6 {
        \override TextScript #'extra-offset = #'( 0 . 2)
        <mib sol>2._\markup {
        \postscript #"
            0.5 setlinewidth
            0 -1.2 moveto
            3.9 -1.1 rlineto
            0 -0.4 moveto
            3.9 -1.1 rlineto
            stroke"
        }
        do2. }
  }

  \layout {
   }
}

helene.pdf
Description: application/download