Re: Ignore stems

[Jean Abou Samra]

Le 25/03/2022 à 13:11, Simon Albrecht a écrit :
> Hello everybody,
>
> I want to try having Lyrics placed without regard for any stems in the 
> adjacent staff (and then using whiteout to remedy the clash, of 
> course). The below approach doesn’t work. Why? Can I make it work?



From grob.cc:

Grob::Grob (SCM basicprops)
{
  [...]
  if (scm_is_null (get_property_data (this, "X-extent")))
    set_property (this, "X-extent", Grob::stencil_width_proc);
  if (scm_is_null (get_property_data (this, "Y-extent")))
    set_property (this, "Y-extent",
                  Unpure_pure_container::make_smob 
(Grob::stencil_height_proc,
Grob::pure_stencil_height_proc));
  if (scm_is_null (get_property_data (this, "vertical-skylines")))
    set_property (this, "vertical-skylines",
                  Unpure_pure_container::make_smob 
(Grob::simple_vertical_skylines_from_extents_proc,
Grob::pure_simple_vertical_skylines_from_extents_proc));
  if (scm_is_null (get_property_data (this, "horizontal-skylines")))
    set_property (this, "horizontal-skylines",
                  Unpure_pure_container::make_smob 
(Grob::simple_horizontal_skylines_from_extents_proc,
Grob::pure_simple_horizontal_skylines_from_extents_proc));
}


In English: these properties (X-extent, Y-extent, horizontal-skylines,
vertical-skylines) have implicit defaults, which are given when the
property is found not to be set. Now you're setting them to the empty
list, which for some reason (David calls it a Lispism, I agree with
him) has been chosen as the value representing lack of value, so the
default gets applied. Try #f instead.

Jean