\layout {
\context {
\Staff
\type Engraver_group
\name TwoLineStaff
\alias Staff
\override StaffSymbol #'line-positions = #'(-2 2)
}
\context {
\Score
\accepts TwoLineStaff
}
}
This layout block defines a special two-line staff.
\new TwoLineStaff { c'4 d'4 e'4 f'4 }
Red and blue versions of our special
TwoLineStaff are available like this.
\layout {
\context {
\Staff
\type Engraver_group
\name TwoLineStaff
\alias Staff
\override StaffSymbol #'line-positions = #'(-2 2)
}
\context {
\TwoLineStaff
\type Engraver_group
\name RedTwoLineStaff
\alias TwoLineStaff
\override NoteHead #'color = #red
\override Stem #'color = #red
\override Dots #'color = #red
}
\context {
\TwoLineStaff
\type Engraver_group
\name BlueTwoLineStaff
\alias TwoLineStaff
\override NoteHead #'color = #blue
\override Stem #'color = #blue
\override Dots #'color = #blue
}
\context {
\Score
\accepts RedTwoLineStaff
\accepts BlueTwoLineStaff
}
}
RedTwoLineStaff and BlueTwoLineStaff here extend TwoLineStaff in the manner of concrete classes extending an abstract base class.
\new Score <<
\new RedTwoLineStaff { c'4 d'4 e'4 f'4 }
\new BlueTwoLineStaff { c'4 d'4 e'4 f'4 }
>>
These definitions of
RedTwoLineStaff and BlueTwoLineStaff avoid code duplication and let us have both types of staff in a single score. In a later post we'll look at a different way to define red and blue two-line staves for different editions of the same score.
