1 ;;;; grob-property-description.scm -- part of generated backend documentation
3 ;;;; source file of the GNU LilyPond music typesetter
5 ;;;; (c) 1998--2007 Han-Wen Nienhuys <hanwen@xs4all.nl>
6 ;;;; Jan Nieuwenhuizen <janneke@gnu.org>
8 (define (define-grob-property symbol type? description)
9 (if (not (equal? (object-property symbol 'backend-doc) #f))
10 (ly:error (_ "symbol ~S redefined") symbol))
12 (set-object-property! symbol 'backend-type? type?)
13 (set-object-property! symbol 'backend-doc description)
16 ;; put this in an alist?
18 all-user-grob-properties
22 (apply define-grob-property x))
25 (X-extent ,number-pair? "Hard coded extent in X@tie{}direction.")
26 (X-offset ,number? "The horizontal amount that this object is
27 moved relative to its X-parent.")
28 (Y-extent ,number-pair? "Hard coded extent in Y@tie{}direction.")
29 (Y-offset ,number? "The vertical amount that this object is moved
30 relative to its Y-parent.")
32 (add-stem-support ,boolean? "If set, the @code{Stem} object is
33 included in this script's support.")
34 (after-line-breaking ,boolean? "Dummy property, used to trigger
35 callback for @code{after-line-breaking}.")
36 (align-dir ,ly:dir? "Which side to align? @code{-1}: left side,
37 @code{0}: around center of width, @code{1}: right side.")
38 (allow-loose-spacing ,boolean? "If set, column can be detached
40 (allow-span-bar ,boolean? "If false, no inter-staff bar line will
41 be created below this bar line.")
42 (alteration ,number? "Alteration numbers for accidental.")
43 (alteration-alist ,list? "List of @code{(@var{pitch}
44 . @var{accidental})} pairs for key signature.")
45 (annotation ,string? "Annotate a grob for debug purposes.")
46 (arpeggio-direction ,ly:dir? "If set, put an arrow on the
47 arpeggio squiggly line.")
48 (arrow-length ,number? "Arrow length.")
49 (arrow-width ,number? "Arrow width.")
50 (auto-knee-gap ,ly:dimension? "If a gap is found between note
51 heads where a horizontal beam fits that is larger than this number,
53 (average-spacing-wishes ,boolean? "If set, the spacing wishes
54 are averaged over staves.")
55 (avoid-note-head ,boolean? "If set, the stem of a chord does not
56 pass through all note heads, but starts at the last note head.")
57 (avoid-slur ,symbol? "Method of handling slur collisions.
58 Choices are @code{around}, @code{inside}, @code{outside}. If unset,
59 scripts and slurs ignore each other. @code{around} only moves the
60 script if there is a collision; @code{outside} always moves the
62 (axes ,list? "List of axis numbers. In the case of alignment
63 grobs, this should contain only one number.")
65 (bar-size ,ly:dimension? "The size of a bar line.")
66 (base-shortest-duration ,ly:moment? "Spacing is based on the
67 shortest notes in a piece. Normally, pieces are spaced as if notes
68 at least as short as this are present.")
69 (baseline-skip ,ly:dimension? "Distance between base lines of
70 multiple lines of text.")
71 (beam-thickness ,ly:dimension? "Beam thickness, measured in
72 @code{staff-space} units.")
73 (beam-width ,ly:dimension? "Width of the tremolo sign.")
74 (beamed-stem-shorten ,list? "How much to shorten beamed stems,
75 when their direction is forced. It is a list, since the value is
76 different depending on the number of flags and beams.")
77 (beaming ,pair? "Pair of number lists. Each number list
78 specifies which beams to make. @code{0}@tie{}is the central beam,
79 @code{1}@tie{}is the next beam toward the note, etc. This
80 information is used to determine how to connect the beaming patterns
81 from stem to stem inside a beam.")
82 (before-line-breaking ,boolean? "Dummy property, used to trigger
83 a callback function.")
84 (between-cols ,pair? "Where to attach a loose column to.")
85 (bound-padding ,number? "The amount of padding to insert around
87 (bound-details ,list? "An alist of properties for determining
88 attachments of spanners to edges.")
89 (bracket-flare ,number-pair? "A pair of numbers specifying how
90 much edges of brackets should slant outward. Value @code{0.0} means
92 (bracket-visibility ,boolean-or-symbol? "This controls the
93 visibility of the tuplet bracket. Setting it to false prevents
94 printing of the bracket. Setting the property to @code{if-no-beam}
95 makes it print only if there is no beam associated with this tuplet
97 (break-align-anchor ,number? "Grobs aligned to this break-align
98 grob will have their X-offsets shifted by this number. In bar lines,
99 for example, this is used to position grobs relative to the (visual)
100 center of the bar line.")
101 (break-align-anchor-alignment ,number? "Read by
102 @code{ly:break-aligned-interface::calc-extent-aligned-anchor} for aligning
103 an anchor to a grob's extent")
104 (break-align-symbol ,symbol? "This key is used for aligning and
105 spacing breakable items.")
106 (break-align-symbols ,list? "A list of symbols that determine
107 which break-aligned grobs to align this to. If the grob selected by
108 the first symbol in the list is invisible due to break-visibility,
109 we will align to the next grob (and so on).")
110 (break-align-orders ,vector? "Defines the order in which
111 prefatory matter (clefs, key signatures) appears. The format is a
112 vector of length@tie{}3, where each element is one order for
113 end-of-line, middle of line, and start-of-line, respectively. An
114 order is a list of symbols.
116 For example, clefs are put after key signatures by setting
119 \\override Score.BreakAlignment #'break-align-orders =
120 #(make-vector 3 '(span-bar
127 (break-overshoot ,number-pair? "How much does a broken spanner
128 stick out of its bounds?")
129 (break-visibility ,vector? "A vector of 3@tie{}booleans,
130 @code{#(@var{end-of-line} @var{unbroken} @var{begin-of-line})}.
131 @code{#t} means visible, @code{#f} means killed.")
132 (breakable ,boolean? "Allow breaks here.")
134 (c0-position ,integer? "An integer indicating the position of
136 (clip-edges ,boolean? "Allow outward pointing beamlets at the
138 (collapse-height ,ly:dimension? "Minimum height of system start
139 delimiter. If equal or smaller, the bracket/brace/line is removed.")
140 (color ,color? "The color of this grob.")
141 (common-shortest-duration ,ly:moment? "The most common shortest
142 note length. This is used in spacing. Enlarging this sets the score
144 (concaveness ,number? "A beam is concave if its inner stems are
145 closer to the beam than the two outside stems. This number is a
146 measure of the closeness of the inner stems. It is used for damping
147 the slope of the beam.")
148 (connect-to-neighbor ,pair? "Pair of booleans, indicating whether
149 this grob looks as a continued break.")
150 (control-points ,list? "List of offsets (number pairs) that form
151 control points for the tie, slur, or bracket shape. For B@'eziers,
152 this should list the control points of a third-order B@'ezier curve.")
154 (damping ,number? "Amount of beam slope damping.")
155 (dash-fraction ,number? "Size of the dashes, relative to
156 @code{dash-period}. Should be between @code{0.0} (no line) and
157 @code{1.0} (continuous line).")
158 (dash-period ,number? "The length of one dash together with
159 whitespace. If negative, no line is drawn at all.")
160 (default-direction ,ly:dir? "Direction determined by note head
162 (digit-names ,vector "Names for string finger digits.")
163 (direction ,ly:dir? "If @code{side-axis} is @code{0} (or
164 @code{#X}), then this property determines whether the object is placed
165 @code{#LEFT}, @code{#CENTER} or @code{#RIGHT} with respect to the
166 other object. Otherwise, it determines whether the object is placed
167 @code{#UP}, @code{#CENTER} or @code{#DOWN}. Numerical values may also
168 be used: @code{#UP}=@code{1}, @code{#DOWN}=@code{-1},
169 @code{#LEFT}=@code{-1}, @code{#RIGHT}=@code{1}, @code{#CENTER}=@code{0}.")
170 (dot-count ,integer? "The number of dots.")
171 (dot-placement-list ,list? "List
172 consisting of @code{(@var{description} @var{string-number}
173 @var{fret-number} @var{finger-number})}
174 entries used to define fret diagrams.")
175 (duration-log ,integer? "The 2-log of the note head duration,
176 i.e., @code{0} = whole note, @code{1} = half note, etc.")
178 (eccentricity ,number? "How asymmetrical to make a slur.
179 Positive means move the center to the right.")
180 (edge-height ,pair? "A pair of numbers specifying the heights of
181 the vertical edges: @code{(@var{left-height} . @var{right-height})}.")
182 (edge-text ,pair? "A pair specifying the texts to be set at the
183 edges: @code{(@var{left-text} . @var{right-text})}.")
184 (expand-limit ,integer? "Maximum number of measures expanded in
186 (extra-X-extent ,number-pair? "A grob is enlarged in
187 X@tie{}dimension by this much.")
188 (extra-Y-extent ,number-pair? "A grob is enlarged in
189 Y@tie{}dimension by this much.")
191 (extra-dy ,number? "Slope glissandi this much extra.")
192 (extra-offset ,number-pair? "A pair representing an offset. This
193 offset is added just before outputting the symbol, so the typesetting
194 engine is completely oblivious to it. The values are measured in
195 @code{staff-space} units of the staff's @code{StaffSymbol}.")
196 (extra-spacing-height ,number-pair? "In the horizontal spacing
197 problem, we increase the height of each item by this amount (by adding
198 the @q{car} to the bottom of the item and adding the @q{cdr} to the top
199 of the item. In order to make a grob infinitely high (to prevent the
200 horizontal spacing problem from placing any other grobs above or below
201 this grob), set this to @code{(-inf.0 . +inf.0)}.")
202 (extra-spacing-width ,number-pair? "In the horizontal spacing
203 problem, we pad each item by this amount (by adding the @q{car} on the
204 left side of the item and adding the @q{cdr} on the right side of the
205 item). In order to make a grob take up no horizontal space at all,
206 set this to @code{(+inf.0 . -inf.0)}.")
207 (flag ,ly:stencil? "A function returning the full flag stencil for
208 the @code{Stem}, which is passed to the function as the only argument.
209 The default ly:stem::calc-stencil function uses the @code{flag-style}
210 property to determine the correct glyph for the
211 flag. By providing your own function, you can create arbitrary flags.")
212 (flag-count ,number? "The number of tremolo beams.")
213 (flag-style ,symbol? "A symbol determining what style of flag
214 glyph is typeset on a @code{Stem}. Valid options include @code{'()} for
215 standard flags, @code{'mensural} and @code{'no-flag}, which switches off
217 (font-encoding ,symbol? "The font encoding is the broadest
218 category for selecting a font. Options include: @code{fetaMusic},
219 @code{fetaNumber}, @code{TeX-text}, @code{TeX-math},
220 @code{fetaBraces}, @code{fetaDynamic}.")
221 (font-family ,symbol? "The font family is the broadest category
222 for selecting text fonts. Options include: @code{sans},
224 (font-name ,string? "Specifies a file name (without extension)
225 of the font to load. This setting overrides selection using
226 @code{font-family}, @code{font-series} and @code{font-shape}.")
227 (font-series ,symbol? "Select the series of a font. Choices
228 include @code{medium}, @code{bold}, @code{bold-narrow}, etc.")
229 (font-shape ,symbol? "Select the shape of a font. Choices
230 include @code{upright}, @code{italic}, @code{caps}.")
231 (font-size ,number? "The font size, compared to the
232 @q{normal}@tie{}size. @code{0}@tie{}is style-sheet's normal size,
233 @code{-1} is smaller, @code{+1} is bigger. Each step of@tie{}1 is
234 approximately 12% larger; 6@tie{}steps are exactly a factor@tie{}2 larger.
235 Fractional values are allowed.")
236 (force-hshift ,number? "This specifies a manual shift for notes
237 in collisions. The unit is the note head width of the first voice
238 note. This is used by @rinternals{note-collision-interface}.")
239 (forced ,boolean? "Manually forced accidental.")
240 (fraction ,number-pair? "Numerator and denominator of a time
242 (french-beaming ,boolean? "Use French beaming style for this
243 stem. The stem stops at the innermost beams.")
245 (fret-diagram-details ,list? "An alist of detailed grob properties
246 for fret diagrams. Each alist entry consists of a
247 (@code{property} . @code{value}) pair.
248 The properties which can be included in fret-diagram-details
249 include the following:
252 @code{barre-type} -- Type of barre indication used.
253 Choices include @code{curved}, @code{straight}, and
254 @code{none}. Default @code{curved}.
256 @code{dot-color} -- Color of dots. Options include
257 @code{black} and @code{white}. Default @code{black}.
259 @code{dot-label-font-mag} -- Magnification for font used to
260 label fret dots. Default value 1.
262 @code{dot-radius} -- Radius of dots, in terms of fret spaces.
263 Default value 0.425 for labeled dots, 0.25 for unlabeled dots.
265 @code{finger-code} -- Code for the type of fingering indication used.
266 Options include @code{none}, @code{in-dot}, and
267 @code{below-string}. Default @code{none} for markup fret diagrams,
268 @code{below-string} for @code{FretBoards} fret diagrams.
270 @code{fret-count} -- The number of frets. Default 4.
272 @code{fret-label-font-mag} -- The magnification of the font used to label
273 the lowest fret number. Default 0.5
275 @code{fret-label-vertical-offset} -- The vertical offset of the fret label
276 from the fret. Default -0.2
278 @code{label-dir} -- Side to which the fret label is attached.
279 @code{-1}, @code{#LEFT}, or @code{#DOWN} for left or down;
280 @code{1}, @code{#RIGHT}, or @code{#UP} for right or up.
281 Default @code{#RIGHT}.
283 @code{mute-string} -- Character string to be used to indicate muted
284 string. Default \"x\".
286 @code{number-type} -- Type of numbers to use in fret label. Choices
287 include @code{roman-lower}, @code{roman-upper}, and @code{arabic}. Default
290 @code{open-string} -- Character string to be used to indicate open
291 string. Default \"o\".
293 @code{orientation} -- Orientation of fret-diagram. Options include
294 @code{normal} and @code{landscape}. Default @code{normal}.
296 @code{string-count} -- The number of strings. Default 6.
298 @code{string-label-font-mag} -- The magnification of the font used to label
299 fingerings at the string, rather than in the dot. Default value 0.6.
301 @code{top-fret-thickness} -- The thickness of the top fret line, as a multiple
302 of the standard thickness. Default value 3.
304 @code{xo-font-magnification} -- Magnification used for mute and
305 open string indicators. Default value 0.5.
307 @code{xo-padding} -- Padding for open and mute indicators from top fret.
312 ;; ugh: double, change.
313 (full-length-padding ,number? "How much padding to use at the right side of a full-length tuplet bracket.")
314 (full-length-to-extent ,boolean? "Run to the extent of the column for a full-length tuplet bracket.")
316 (full-size-change ,boolean? "Don't make a change clef smaller.")
318 (gap ,ly:dimension? "Size of a gap in a variable symbol.")
319 (gap-count ,integer? "Number of gapped beams for tremolo.")
320 (glyph ,string? "A string determining what @q{style} of glyph is
321 typeset. Valid choices depend on the function that is reading this
323 (glyph-name-alist ,list? "An alist of key-string pairs.")
324 (grow-direction ,ly:dir? "Crescendo or decrescendo?")
326 (hair-thickness ,number? "Thickness of the thin line in a bar
328 (harp-pedal-details ,list? "An alist of detailed grob properties
329 for harp pedal diagrams. Each alist entry consists of a
330 (@code{property} . @code{value}) pair.
331 The properties which can be included in harp-pedal-details
332 include the following:
335 @code{box-offset} -- Vertical shift of the center of flat / sharp pedal
336 boxes above / below the horizontal line. Default value 0.8.
338 @code{box-width} -- Width of each pedal box. Default value 0.4.
340 @code{box-height} -- Height of each pedal box. Default value 1.0.
342 @code{space-before-divider} -- Space between boxes before the first divider
343 (so that the diagram can be made symmetric). Default value 0.8.
345 @code{space-after-divider} -- Space between boxes after the first divider.
348 @code{circle-thickness} -- Thickness (in unit of the line-thickness) of the
349 ellipse around circled pedals. Default value 0.5.
351 @code{circle-x-padding} -- Padding in X direction of the ellipse around
352 circled pedals. Default value 0.15.
354 @code{circle-y-padding} -- Padding in Y direction of the ellipse around
355 circled pedals. Default value 0.2.
358 (head-direction ,ly:dir? "Are the note heads left or right in a
360 (height ,ly:dimension? "Height of an object in
361 @code{staff-space} units.")
362 (height-limit ,ly:dimension? "Maximum slur height: The longer the
363 slur, the closer it is to this height.")
364 (horizontal-shift ,integer? "An integer that identifies ranking
365 of @code{NoteColumn}s for horizontal shifting. This is used by
366 @rinternals{note-collision-interface}.")
367 (horizontal-skylines ,ly:skyline-pair? "Two skylines, one to the
368 left and one to the right of this grob.")
370 (ignore-collision ,boolean? "If set, don't do note collision
371 resolution on this @code{NoteColumn}.")
372 (implicit ,boolean? "Is this an implicit bass figure?")
373 (inspect-index ,integer? "If debugging is set, set beam and slur
374 configuration to this index, and print the respective scores.")
375 (inspect-quants ,number-pair? "If debugging is set,
376 set beam and slur quants to this position, and print the respective
379 (keep-fixed-while-stretching ,boolean? "A grob with this property
380 set to true is fixed relative to the staff above it when systems are
382 (keep-inside-line ,boolean? "If set, this column cannot have
383 objects sticking into the margin.")
384 (kern ,ly:dimension? "Amount of extra white space to add. For
385 bar lines, this is the amount of space after a thick line.")
386 (knee ,boolean? "Is this beam kneed?")
387 (knee-spacing-correction ,number? "Factor for the optical
388 correction amount for kneed beams. Set between @code{0} for no
389 correction and @code{1} for full correction.")
391 (labels ,list? "List of labels (symbols) placed on a column")
392 (layer ,integer? "The output layer (a value between 0 and@tie{}2:
393 Layers define the order of printing objects. Objects in lower layers
394 are overprinted by objects in higher layers.")
395 (ledger-line-thickness ,number-pair? "The thickness of ledger
396 lines. It is the sum of 2@tie{}numbers: The first is the factor for
397 line thickness, and the second for staff space. Both contributions
399 (left-bound-info ,list? "An alist of properties for determining
400 attachments of spanners to edges.")
401 (left-padding ,ly:dimension? "The amount of space that is put
402 left to an object (e.g., a group of accidentals).")
403 (length ,ly:dimension? "User override for the stem length of
405 (length-fraction ,number? "Multiplier for lengths. Used for
406 determining ledger lines and stem lengths.")
407 (line-break-penalty ,number? "Penalty for a line break at this
408 column. This affects the choices of the line breaker; it avoids a
409 line break at a column with a positive penalty and prefers a line break
410 at a column with a negative penalty.")
411 (line-break-permission ,symbol? "Instructs the line breaker on
412 whether to put a line break at this column. Can be @code{force} or
414 (line-break-system-details ,list? "An alist of properties to use
415 if this column is the start of a system.")
416 (line-count ,integer? "The number of staff lines.")
417 (line-positions ,list? "Vertical positions of staff lines.")
418 (line-thickness ,number? "The thickness of the tie or slur
420 (long-text ,markup? "Text markup. See @ruser{Formatting
423 (max-beam-connect ,integer? "Maximum number of beams to connect
424 to beams from this stem. Further beams are typeset as beamlets.")
425 (max-stretch ,number? "The maximum amount that this
426 @code{VerticalAxisGroup} can be vertically stretched (for example, in
427 order to better fill a page).")
428 (measure-count ,integer? "The number of measures for a
429 multi-measure rest.")
430 (measure-length ,ly:moment? "Length of a measure. Used in some
431 spacing situations.")
432 (merge-differently-dotted ,boolean? "Merge note heads in
433 collisions, even if they have a different number of dots. This is
434 normal notation for some types of polyphonic music.
436 @code{merge-differently-dotted} only applies to opposing stem
437 directions (i.e., voice 1 &@tie{}2).")
438 (merge-differently-headed ,boolean? "Merge note heads in
439 collisions, even if they have different note heads. The
440 smaller of the two heads is rendered invisible. This is used in
441 polyphonic guitar notation. The value of this setting is used by
442 @rinternals{note-collision-interface}.
444 @code{merge-differently-headed} only applies to opposing stem
445 directions (i.e., voice 1 &@tie{}2).")
446 (minimum-X-extent ,number-pair? "Minimum size of an object in
447 X@tie{}dimension, measured in @code{staff-space} units.")
448 (minimum-Y-extent ,number-pair? "Minimum size of an object in
449 Y@tie{}dimension, measured in @code{staff-space} units.")
450 (minimum-distance ,ly:dimension? "Minimum distance between rest
452 (minimum-length ,ly:dimension? "Try to make a spanner at least
453 this long, normally in the horizontal direction. This requires an
454 appropriate callback for the @code{springs-and-rods} property. If
455 added to a @code{Tie}, this sets the minimum distance between
457 (minimum-length-fraction ,number? "Minimum length of ledger line
458 as fraction of note head size.")
459 (minimum-space ,ly:dimension? "Minimum distance that the victim
460 should move (after padding).")
462 (neutral-direction ,ly:dir? "Which direction to take in the
463 center of the staff.")
464 (neutral-position ,number? "Position (in half staff spaces) where
465 to flip the direction of custos stem.")
466 (next ,ly:grob? "Object that is next relation (e.g., the lyric
467 syllable following an extender.")
468 (no-alignment ,boolean? "If set, don't place this grob in a
469 @code{VerticalAlignment}; rather, place it using its own @code{Y-offset}
471 (no-ledgers ,boolean? "If set, don't draw ledger lines on this
473 (no-stem-extend ,boolean? "If set, notes with ledger lines do not
474 get stems extending to the middle staff line.")
475 (non-default ,boolean? "Set for manually specified clefs.")
476 (non-musical ,boolean? "True if the grob belongs to a
477 @code{NonMusicalPaperColumn}.")
478 (note-names ,vector? "Vector of strings containing names for
479 easy-notation note heads.")
481 (outside-staff-horizontal-padding ,number? "By default, an
482 outside-staff-object can be placed so that is it very close to another
483 grob horizontally. If this property is set, the outside-staff-object
484 is raised so that it is not so close to its neighbor.")
485 (outside-staff-padding ,number? "The padding to place between
486 this grob and the staff when spacing according to
487 @code{outside-staff-priority}.")
488 (outside-staff-priority ,number? "If set, the grob is positioned
489 outside the staff in such a way as to avoid all collisions.
490 In case of a potential collision, the grob with the smaller
491 @code{outside-staff-priority} is closer to the staff.")
493 (packed-spacing ,boolean? "If set, the notes are spaced as
494 tightly as possible.")
495 (padding ,ly:dimension? "Add this much extra space between
496 objects that are next to each other.")
497 (page-break-penalty ,number? "Penalty for page break at this
498 column. This affects the choices of the page breaker; it avoids a
499 page break at a column with a positive penalty and prefers a page break
500 at a column with a negative penalty.")
501 (page-break-permission ,symbol? "Instructs the page breaker on
502 whether to put a page break at this column. Can be @code{force} or
504 (page-turn-penalty ,number? "Penalty for a page turn at this
505 column. This affects the choices of the page breaker; it avoids a
506 page turn at a column with a positive penalty and prefers a page turn
507 at a column with a negative penalty.")
508 (page-turn-permission ,symbol? "Instructs the page breaker on
509 whether to put a page turn at this column. Can be @code{force} or
511 (parenthesized ,boolean? "Parenthesize this grob.")
512 (positions ,number-pair? "Pair of staff coordinates
513 @code{(@var{left} . @var{right})}, where both @var{left} and
514 @var{right} are in @code{staff-space} units of the current staff.
515 For slurs, this value selects which slur candidate to use; if
516 extreme positions are requested, the closest one is taken.")
517 (prefer-dotted-right ,boolean? "For note collisions, prefer to
518 shift dotted up-note to the right, rather than shifting just the
521 (ratio ,number? "Parameter for slur shape. The higher this
522 number, the quicker the slur attains its @code{height-limit}.")
523 (remove-empty ,boolean? "If set, remove group if it contains no
525 (remove-first ,boolean? "Remove the first staff of a orchestral
527 (restore-first ,boolean? "Print a natural before the
529 (rhythmic-location ,rhythmic-location? "Where (bar number,
530 measure position) in the score.")
531 (right-bound-info ,list? "An alist of properties for determining
532 attachments of spanners to edges.")
533 (right-padding ,ly:dimension? "Space to insert on the right side
534 of an object (e.g., between note and its accidentals).")
535 (rotation ,list? "Number of degrees to rotate this object, and
536 what point to rotate around. For example, @code{#'(45 0 0)} rotates
537 by 45 degrees around the center of this object.")
539 (same-direction-correction ,number? "Optical correction amount
540 for stems that are placed in tight configurations. This amount is
541 used for stems with the same direction to compensate for note head to
543 (script-priority ,number? "A sorting key that determines in what
544 order a script is within a stack of scripts.")
545 (self-alignment-X ,number? "Specify alignment of an object. The
546 value @code{-1} means left aligned, @code{0}@tie{}centered, and
547 @code{1}@tie{}right-aligned in X@tie{}direction. Other numerical
548 values may also be specified.")
549 (self-alignment-Y ,number? "Like @code{self-alignment-X} but for
551 (shorten-pair ,number-pair? "The lengths to shorten a
552 text-spanner on both sides, for example a pedal bracket. Positive
553 values shorten the text-spanner, while negative values lengthen it.")
554 (shortest-duration-space ,ly:dimension? "Start with this much
555 space for the shortest duration. This is expressed in
556 @code{spacing-increment} as unit. See also
557 @rinternals{spacing-spanner-interface}.")
558 (shortest-playing-duration ,ly:moment? "The duration of the
559 shortest note playing here.")
560 (shortest-starter-duration ,ly:moment? "The duration of the
561 shortest note that starts here.")
562 (side-axis ,number? "If the value is @code{#X} (or
563 equivalently@tie{}@code{0}), the object is placed horizontally next
564 to the other object. If the value is @code{#Y} or@tie{}@code{1}, it
565 is placed vertically.")
566 (side-relative-direction ,ly:dir? "Multiply direction of
567 @code{direction-source} with this to get the direction of this
569 (size ,number? "Size of object, relative to standard size.")
570 (slope ,number? "The slope of this object.")
571 (slur-padding ,number? "Extra distance between slur and script.")
572 (space-alist ,list? "A table that specifies distances between
573 prefatory items, like clef and time-signature. The format is an alist
574 of spacing tuples: @code{(@var{break-align-symbol} @var{type}
575 . @var{distance})}, where @var{type} can be the symbols
576 @code{minimum-space} or @code{extra-space}.")
577 (space-to-barline ,boolean? "If set, the distance between a note
578 and the following non-musical column will be measured to the bar line
579 instead of to the beginning of the non-musical column. If there is a
580 clef change followed by a bar line, for example, this means that we will
581 try to space the non-musical column as though the clef is not there.")
582 (spacing-increment ,number? "Add this much space for a doubled
583 duration. Typically, the width of a note head. See also
584 @rinternals{spacing-spanner-interface}.")
585 (springs-and-rods ,boolean? "Dummy variable for triggering
587 (stacking-dir ,ly:dir? "Stack objects in which direction?")
588 (staff-padding ,ly:dimension? "Maintain this much space between
589 reference points and the staff. Its effect is to align objects of
590 differing sizes (like the dynamics @b{p} and @b{f}) on their
592 (staff-position ,number? "Vertical position, measured in half
593 staff spaces, counted from the middle line.")
594 (staff-space ,ly:dimension? "Amount of space between staff lines,
595 expressed in global @code{staff-space}.")
596 (stem-attachment ,number-pair? "An @code{(@var{x} . @var{y})} pair
597 where the stem attaches to the notehead.")
598 (stem-end-position ,number? "Where does the stem end (the end is
599 opposite to the support-head)?")
601 (stem-spacing-correction ,number? "Optical correction amount for
602 stems that are placed in tight configurations. For opposite
603 directions, this amount is the correction for two normal sized stems
604 that overlap completely.")
605 (stemlet-length ,number? "How long should a stem over a rest
607 (stencil ,ly:stencil? "The symbol to print.")
608 (stencils ,list? "Multiple stencils, used as intermediate
610 (strict-grace-spacing ,boolean? "If set, grace notes
611 are not spaced separately, but put before musical columns.")
612 (strict-note-spacing ,boolean? "If set, unbroken columns
613 with non-musical material (clefs, bar lines, etc.) are not spaced
614 separately, but put before musical columns.")
615 (stroke-style ,string? "Set to @code{\"grace\"} to turn stroke
617 (style ,symbol? "This setting determines in what style a grob is
618 typeset. Valid choices depend on the @code{stencil} callback reading
621 (text ,markup? "Text markup. See @ruser{Formatting text}.")
622 ;;FIXME -- Should both be the same?
623 (text-direction ,ly:dir? "This controls the ordering of the
624 words. The default @code{RIGHT} is for roman text. Arabic or Hebrew
625 should use @code{LEFT}.")
626 (thick-thickness ,number? "Bar line thickness, measured in
627 @code{line-thickness}.")
628 (thickness ,number? "Line thickness, generally measured in
629 @code{line-thickness}.")
630 (thin-kern ,number? "The space after a hair-line in a bar line.")
631 (threshold ,number-pair? "@code{(@var{min} . @var{max})}, where
632 @var{min} and @var{max} are dimensions in staff space.")
633 (to-barline ,boolean? "If true, the spanner will stop at the bar line
634 just before it would otherwise stop.")
635 (tie-configuration ,list? "List of @code{(@var{position} .
636 @var{dir})} pairs, indicating the desired tie configuration, where
637 @var{position} is the offset from the center of the staff in staff
638 space and @var{dir} indicates the direction of the tie
639 (@code{1}=>up, @code{-1}=>down, @code{0}=>center). A non-pair entry
640 in the list causes the corresponding tie to be formatted
642 (transparent ,boolean? "This makes the grob invisible.")
644 (uniform-stretching ,boolean? "If set, items stretch
645 proportionally to their durations. This looks better in complex
646 polyphonic patterns.")
647 (used ,boolean? "If set, this spacing column is kept in the
650 (vertical-skylines ,ly:skyline-pair? "Two skylines, one above and
651 one below this grob.")
653 (when ,ly:moment? "Global time step associated with this column
655 (width ,ly:dimension? "The width of a grob measured in staff
657 (word-space ,ly:dimension? "Space to insert between words in
660 (zigzag-length ,ly:dimension? "The length of the lines of a
661 zigzag, relative to @code{zigzag-width}. A value of@tie{}@code{1}
662 gives 60-degree zigzags.")
663 (zigzag-width ,ly:dimension? "The width of one zigzag squiggle.
664 This number is adjusted slightly so that the glissando line can
665 be constructed from a whole number of squiggles.")
673 (define (define-internal-grob-property symbol type? description)
674 (define-grob-property symbol type? description)
675 (set-object-property! symbol 'backend-internal #t)
680 (define-public all-internal-grob-properties
683 (apply define-internal-grob-property x))
687 ;; grobs & grob arrays. (alphabetical)
688 (X-common ,ly:grob? "Common reference point for axis group.")
690 (Y-common ,ly:grob? "See @code{X-common}.")
692 (accidental-grob ,ly:grob? "The accidental for this note.")
693 (accidental-grobs ,list? "An alist with @code{(@var{notename} .
694 @var{groblist})} entries.")
695 (adjacent-pure-heights ,vector? "Used by a @code{VerticalAxisGroup} to
696 cache the @code{Y-extent}s of different column ranges.")
697 (adjacent-hairpins ,ly:grob-array? "A list of directly neighboring
699 (all-elements ,ly:grob-array? "A list of all grobs in this line. Its
700 function is to protect objects from being garbage collected.")
701 (arpeggio ,ly:grob? "A pointer to an @code{Arpeggio} object.")
702 (axis-group-parent-X ,ly:grob? "Containing X@tie{}axis group.")
703 (axis-group-parent-Y ,ly:grob? "Containing Y@tie{}axis group.")
705 (bar-extent ,number-pair? "The Y-extent of the actual bar line.
706 This may differ from @code{Y-extent} because it does not include the dots in
708 (bars ,ly:grob-array? "A list of bar line pointers.")
709 (beam ,ly:grob? "A pointer to the beam, if applicable.")
710 (bounded-by-me ,ly:grob-array? "A list of spanners that have this
711 column as start/begin point. Only columns that have grobs or act as
713 (bracket ,ly:grob? "The bracket for a number.")
715 (columns ,ly:grob-array? "A list of grobs, typically containing
716 @code{PaperColumn} or @code{NoteColumn} objects.")
717 (conditional-elements ,ly:grob-array? "Internal use only.")
718 (cross-staff ,boolean? "For a beam or a stem, this is true if we
719 depend on inter-staff spacing.")
721 (direction-source ,ly:grob? "In case @code{side-relative-direction} is
722 set, which grob to get the direction from.")
723 (dot ,ly:grob? "A reference to a @code{Dots} object.")
724 (dots ,ly:grob-array? "Multiple @code{Dots} objects.")
726 (elements ,ly:grob-array? "A list of grobs; the type is depending on
727 the grob where this is set in.")
728 (encompass-objects ,ly:grob-array? "Objects that a slur should avoid
729 in addition to notes and stems.")
731 (figures ,ly:grob-array? "Figured bass objects for continuation line.")
733 (glyph-name ,string? "The glyph name within the font.")
734 (grace-spacing ,ly:grob? "A run of grace notes.")
736 (heads ,ly:grob-array? "A list of note heads.")
738 (important-column-ranks ,vector? "A cache of columns that contain
739 @code{items-worth-living} data.")
740 (items-worth-living ,ly:grob-array? "A list of interesting items. If
741 empty in a particular staff, then that staff is erased.")
743 (left-items ,ly:grob-array? "DOCME")
744 (left-neighbors ,ly:grob-array? "A list of @code{spacing-wishes} grobs
745 that are close to the current column.
747 The closest @code{spacing-wishes} determine the actual distances between the
750 (normal-stems ,ly:grob-array? "An array of visible stems.")
751 (note-columns ,pair? "A list of @code{NoteColumn} grobs.")
752 (note-head ,ly:grob? "A single note head.")
753 (note-heads ,ly:grob-array? "A list of note head grobs.")
755 (padding-pairs ,list? "An alist mapping @code{(@var{name} . @var{name})}
757 (pedal-text ,ly:grob? "A pointer to the text of a mixed-style piano
759 (pure-Y-common ,ly:grob? "A cache of the
760 @code{common_refpoint_of_array} of the @code{elements} grob set.")
761 (pure-Y-offset-in-progress ,boolean? "A debugging aid for catching
762 cyclic dependencies.")
763 (pure-relevant-items ,ly:grob-array? "A subset of elements that are
764 relevant for finding the @code{pure-Y-extent}.")
765 (pure-relevant-spanners ,ly:grob-array? "A subset of elements that are
766 relevant for finding the @code{pure-Y-extent}.")
768 (rest ,ly:grob? "A pointer to a @code{Rest} object.")
769 (rest-collision ,ly:grob? "A rest collision that a rest is in.")
770 (rests ,ly:grob-array? "A list of rest objects.")
771 (right-items ,ly:grob-array? "DOCME")
772 (right-neighbors ,ly:grob-array? "See @code{left-neighbors}.")
774 (separation-item ,ly:grob? "A separation item.")
775 (side-support-elements ,ly:grob-array? "The side support, a list of
777 (slur ,ly:grob? "A pointer to a @code{Slur} object.")
778 (spaceable-staves ,ly:grob-array? "Objects to be spaced during page
780 (spacing ,ly:grob? "The spacing spanner governing this section.")
781 (spacing-wishes ,ly:grob-array? "List of note spacing or staff spacing
783 (staff-symbol ,ly:grob? "The staff symbol grob that we are in.")
784 (stem ,ly:grob? "A pointer to a @code{Stem} object.")
785 (stems ,ly:grob-array? "A list of stem objects, corresponding to the
786 notes that the arpeggio has to be before.")
788 (tie ,ly:grob? "A pointer to a @code{Tie} object.")
789 (tremolo-flag ,ly:grob? "The tremolo object on a stem.")
790 (tuplet-number ,ly:grob? "The number for a bracket.")
791 (tuplets ,ly:grob-array? "A list of smaller tuplet brackets.")
795 (begin-of-line-visible ,boolean? "Used for marking @code{ChordNames}
796 that should only show changes.")
798 (cause ,scheme? "Any kind of causation objects (i.e., music, or perhaps
799 translator) that was the cause for this grob.")
800 (circled-tip ,boolean? "Put a circle at start/end of hairpins (al/del
803 (delta-position ,number? "The vertical position difference.")
804 (details ,list? "Alist of parameters for detailed grob behavior.
806 More information on the allowed parameters can be found by inspecting
807 @file{lily/slur-scoring.cc}, @file{lily/beam-quanting.cc}, and
808 @file{lily/tie-formatting-problem.cc}. Setting @code{debug-tie-scoring},
809 @code{debug-beam-scoring} or @code{debug-slur-scoring} also provides
812 (font ,ly:font-metric? "A cached font metric object.")
814 (head-width ,ly:dimension? "The width of this ligature head.")
816 (ideal-distances ,list? "@code{(@var{obj} . (@var{dist} .
817 @var{strength}))} pairs.")
818 (interfaces ,list? "A list of symbols indicating the interfaces
819 supported by this object. It is initialized from the @code{meta} field.")
821 (least-squares-dy ,number? "The ideal beam slope, without damping.")
823 (meta ,list? "Provide meta information. It is an alist with the
824 entries @code{name} and @code{interfaces}.")
825 (minimum-distances ,list? "A list of rods that have the format
826 @code{(@var{obj} . @var{dist})}.")
828 (positioning-done ,boolean? "Used to signal that a positioning element
829 did its job. This ensures that a positioning is only done once.")
830 (pure-Y-extent ,number-pair? "The estimated height of a system.")
832 (quant-score ,string? "The beam quanting score; stored for
834 (quantize-position ,boolean? "If set, a vertical alignment is aligned
835 to be within staff spaces.")
836 (quantized-positions ,number-pair? "The beam positions after
839 (script-stencil ,pair? "A pair @code{(@var{type} . @var{arg})} which
840 acts as an index for looking up a @code{Stencil} object.")
841 (shorten ,ly:dimension? "The amount of space that a stem is shortened.
842 Internally used to distribute beam shortening over stems.")
843 (skyline-distance ,number? "The distance between this staff and the
844 next one, as determined by a skyline algorithm.")
845 (skyline-horizontal-padding ,number? "For determining the vertical
846 distance between two staves, it is possible to have a configuration which
847 would result in a tight interleaving of grobs from the top staff and the
848 bottom staff. The larger this parameter is, the farther apart the staves
849 are placed in such a configuration.")
850 (stem-info ,pair? "A cache of stem parameters.")
852 (use-breve-rest ,boolean? "Use breve rests for measures longer
859 ;; There are too many properties for ancient notation;
860 ;; probably neume-types (a list of symbols) would also work.
862 ;; However, such a list would consist of a couple of dozens of
863 ;; entries, since head prefixes may be combined in many ways. If
864 ;; the macros in `gregorian-init.ly' would directly set prefix-set,
865 ;; all the head prefixes could be junked; however, such macros
866 ;; would be quite numerous, I guess. --jr
868 (add-cauda ,boolean? "Does this flexa require an additional cauda on
870 (add-join ,boolean? "Is this ligature head-joined with the next one
871 by a vertical line?")
872 (add-stem ,boolean? "Is this ligature head a virga and therefore needs
873 an additional stem on the right side?")
874 (ascendens ,boolean? "Is this neume of ascending type?")
875 (auctum ,boolean? "Is this neume liquescentically augmented?")
877 (cavum ,boolean? "Is this neume outlined?")
878 (context-info ,integer? "Within a ligature, the final glyph or shape of
879 a head may be affected by the left and/or right neighbour head.
880 @code{context-info} holds for each head such information about the left and
881 right neighbour, encoded as a bit mask.")
883 (descendens ,boolean? "Is this neume of descendent type?")
884 (deminutum ,boolean? "Is this neume deminished?")
886 (flexa-height ,ly:dimension? "The height of a flexa shape in a ligature
887 grob (in @code{staff-space} units).")
888 (flexa-width ,ly:dimension? "The width of a flexa shape in a
889 ligature grob in (in @code{staff-space} units).")
891 (inclinatum ,boolean? "Is this neume an inclinatum?")
893 (join-heads ,boolean? "Whether to join the note heads of an ambitus
894 grob with a vertical line.")
895 (join-right-amount ,number? "DOCME")
897 (linea ,boolean? "Attach vertical lines to this neume?")
899 (oriscus ,boolean? "Is this neume an oriscus?")
901 (pes-or-flexa ,boolean? "Shall this neume be joined with the previous
903 (prefix-set ,number? "A bit mask that holds all Gregorian head
904 prefixes, such as @code{\\virga} or @code{\\quilisma}.")
905 (primitive ,integer? "A pointer to a ligature primitive, i.e., an item
906 similar to a note head that is part of a ligature.")
908 (quilisma ,boolean? "Is this neume a quilisma?")
910 (stropha ,boolean? "Is this neume a stropha?")
912 (virga ,boolean? "Is this neume a virga?")
914 (x-offset ,ly:dimension? "Extra horizontal offset for ligature heads.")
918 (define-public all-backend-properties
920 all-internal-grob-properties
921 all-user-grob-properties))