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3.1.29 ChordSquare

In a chord grid, this grob represents one chord square. It helps place GridChordName grobs, and draws lines to separate them. Note that this grob only draws the diagonal lines in a square. The borders of the square are drawn by StaffSymbol and BarLine.

ChordSquare objects are created by the following engraver(s): Chord_square_engraver.

Standard settings:

measure-division-chord-placement-alist (association list (list of pairs)):

'(((1) (0 . 0))
  ((1/2 1/2) (-0.4 . 0.4) (0.4 . -0.4))
  ((1/2 1/4 1/4)
   (-0.4 . 0.4)
   (0 . -0.65)
   (0.63 . 0))
  ((1/4 1/4 1/2)
   (-0.63 . 0)
   (0 . 0.65)
   (0.4 . -0.4))
  ((1/4 1/4 1/4 1/4)
   (-0.63 . 0)
   (0 . 0.7)
   (0 . -0.65)
   (0.63 . 0))
  ((1/4 3/4) (-0.63 . 0) (0.38 . 0))
  ((3/4 1/4) (-0.38 . 0) (0.63 . 0)))

An alist mapping measure divisions (see the measure-division property) to lists of coordinates (number pairs) applied to the chord names of a chord square. Coordinates are normalized between -1 and 1 within the square.

measure-division-lines-alist (association list (list of pairs)):

'(((1))
  ((1/2 1/2) (-1 -1 1 1))
  ((1/2 1/4 1/4) (-1 -1 1 1) (0 0 1 -1))
  ((1/4 1/4 1/2) (-1 -1 1 1) (-1 1 0 0))
  ((1/4 1/4 1/4 1/4) (-1 -1 1 1) (-1 1 1 -1))
  ((1/4 3/4) (-1 -1 0 0) (-1 1 0 0))
  ((3/4 1/4) (0 0 1 -1) (0 0 1 1)))

An alist mapping measure divisions (see the measure-division property) to lists of lines to draw in the square, given as 4-element lists: (x-start y-start x-end y-end).

stencil (stencil):

chord-square::print

The symbol to print.

X-extent (pair of numbers):

chord-square::width

Extent (size) in the X direction, measured in staff-space units, relative to object’s reference point.

Y-extent (pair of numbers):

#<unpure-pure-container #<procedure chord-square::height (grob)> >

Extent (size) in the Y direction, measured in staff-space units, relative to object’s reference point.

This object supports the following interface(s): chord-square-interface, grob-interface, line-interface and spanner-interface.

This object is of class Spanner (characterized by spanner-interface).