LilyPond Beginnershandleiding

Hoofdstuk 4: Tweaking output 102
{
}
\time 12/16
\omit Staff.TimeSignature
c4 b8 c d16 c d8 |
g,8 a16 b8 c d4 e16 |
e8
and the difference is obvious: setting the stencil to #f (possibly via \omit) removes the object
entirely; making the object transparent (which can be done using \hide) leaves it where it is,
but makes it invisible.
The color property
Finally let us try making the bar lines invisible by coloring them white. (There is a difficulty with
this in that the white bar line may or may not blank out the staff lines where they cross. You
may see in some of the examples below that this happens unpredictably. The details of why this
is so and how to control it are covered in Sectie “Painting objects white” in Notatie-handleiding.
But at the moment we are learning about color, so please just accept this limitation for now.)
The grob-interface specifies that the color property value is a list, but there is no explanation
of what that list should be. The list it requires is actually a list of values in internal units,
but, to avoid having to know what these are, several ways are provided to specify colors. The
first way is to use one of the ‘normal’ colors listed in the first table in Sectie “List of colors” in
Notatie-handleiding. To set the bar lines to white we write:
{
}
\time 12/16
\override Staff.BarLine.color = #white
c4 b8 c d16 c d8 |
g,8 a16 b8 c d4 e16 |
e8
12
16
and again, we see the bar lines are not visible. Note that white is not preceded by an apostrophe –
it is not a symbol, but a variable. When evaluated, it provides the list of internal values required
to set the color to white. The other colors in the normal list are variables too. To convince
yourself this is working you might like to change the color to one of the other variables in the
list.
The second way of changing the color is to use the list of X11 color names in the second list
in Sectie “List of colors” in Notatie-handleiding. However, these are mapped to the actual values
by the function x11-color which converts X11 color symbols into the list of internal values like
this:
{
\time 12/16
\override Staff.BarLine.color = #(x11-color 'white)