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? "See @code{X-extent}.")
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 barline will
41 be created below this barline.")
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 (barre-type ,symbol? "Type of barre indication used in a fret
67 diagram. Choices include @code{curved} and @code{straight}.")
68 (base-shortest-duration ,ly:moment? "Spacing is based on the
69 shortest notes in a piece. Normally, pieces are spaced as if notes
70 at least as short as this are present.")
71 (baseline-skip ,ly:dimension? "Distance between base lines of
72 multiple lines of text.")
73 (beam-thickness ,ly:dimension? "Beam thickness, measured in
74 @code{staff-space} units.")
75 (beam-width ,ly:dimension? "Width of the tremolo sign.")
76 (beamed-stem-shorten ,list? "How much to shorten beamed stems,
77 when their direction is forced. It is a list, since the value is
78 different depending on the number of flags and beams.")
79 (beaming ,pair? "Pair of number lists. Each number list
80 specifies which beams to make. @code{0}@tie{}is the central beam,
81 @code{1}@tie{}is the next beam toward the note, etc. This
82 information is used to determine how to connect the beaming patterns
83 from stem to stem inside a beam.")
84 (before-line-breaking ,boolean? "Dummy property, used to trigger
85 a callback function.")
86 (between-cols ,pair? "Where to attach a loose column to.")
87 (bound-padding ,number? "The amount of padding to insert around
89 (bound-details ,list? "An alist of properties for determining
90 attachments of spanners to edges.")
91 (bracket-flare ,number-pair? "A pair of numbers specifying how
92 much edges of brackets should slant outward. Value @code{0.0} means
94 (bracket-visibility ,boolean-or-symbol? "This controls the
95 visibility of the tuplet bracket. Setting it to false prevents
96 printing of the bracket. Setting the property to @code{if-no-beam}
97 makes it print only if there is no beam associated with this tuplet
99 (break-align-anchor ,number? "Grobs aligned to this break-align
100 grob will have their X-offsets shifted by this number. In barlines,
101 for example, this is used to position grobs relative to the (visual)
102 center of the barline.")
103 (break-align-anchor-alignment ,number? "Read by
104 ly:break-aligned-interface::calc-extent-aligned-anchor for aligning
105 an anchor to a grobs extent")
106 (break-align-symbol ,symbol? "This key is used for aligning and
107 spacing breakable items.")
108 (break-align-symbols ,list? "A list of symbols that determine
109 which break-aligned grobs to align this to. If the grob selected by
110 the first symbol in the list is invisible due to break-visibility,
111 we will align to the next grob (and so on).")
112 (break-align-orders ,vector? "Defines the order in which
113 prefatory matter (clefs, key signatures) appears. The format is a
114 vector of length@tie{}3, where each element is one order for
115 end-of-line, middle of line, and start-of-line, respectively. An
116 order is a list of symbols.
118 For example, clefs are put after key signatures by setting
121 \\override Score.BreakAlignment #'break-align-orders =
122 #(make-vector 3 '(span-bar
129 (break-overshoot ,number-pair? "How much does a broken spanner
130 stick out of its bounds?")
131 (break-visibility ,vector? "A vector of 3@tie{}booleans,
132 @code{#(@var{end-of-line} @var{unbroken} @var{begin-of-line})}.
133 @code{#t} means visible, @code{#f} means killed.")
134 (breakable ,boolean? "Allow breaks here.")
136 (c0-position ,integer? "An integer indicating the position of
138 (clip-edges ,boolean? "Allow outward pointing beamlets at the
140 (collapse-height ,ly:dimension? "Minimum height of system start
141 delimiter. If equal or smaller, the bracket/brace/line is removed.")
142 (color ,color? "The color of this grob.")
143 (common-shortest-duration ,ly:moment? "The most common shortest
144 note length. This is used in spacing. Enlarging this sets the score
146 (concaveness ,number? "A beam is concave if its inner stems are
147 closer to the beam than the two outside stems. This number is a
148 measure of the closeness of the inner stems. It is used for damping
149 the slope of the beam.")
150 (connect-to-neighbor ,pair? "Pair of booleans, indicating whether
151 this grob looks as a continued break.")
152 (control-points ,list? "List of offsets (number pairs) that form
153 control points for the tie, slur, or bracket shape. For B@'eziers,
154 this should list the control points of a third-order B@'ezier curve.")
156 (damping ,number? "Amount of beam slope damping.")
157 (dash-fraction ,number? "Size of the dashes, relative to
158 @code{dash-period}. Should be between @code{0.0} (no line) and
159 @code{1.0} (continuous line).")
160 (dash-period ,number? "The length of one dash together with
161 whitespace. If negative, no line is drawn at all.")
162 (default-direction ,ly:dir? "Direction determined by note head
164 (digit-names ,vector "Names for string finger digits.")
165 (direction ,ly:dir? "If @code{side-axis} is @code{1} (or
166 @code{#X}), then this property determines whether the object is placed
167 @code{#LEFT}, @code{#CENTER} or @code{#RIGHT} with respect to the
168 other object. Otherwise, it determines whether the object is placed
169 @code{#UP}, @code{#CENTER} or @code{#DOWN}. Numerical values may also
170 be used: @code{#UP}=@code{1}, @code{#DOWN}=@code{-1},
171 @code{#LEFT}=@code{-1}, @code{#RIGHT}=@code{1}, @code{CENTER}=@code{0}
172 but also other numerical values are permitted.")
173 (dot-color ,symbol? "Color of dots. Options include
174 @code{black} and @code{white}.")
175 (dot-count ,integer? "The number of dots.")
176 (dot-radius ,number? "Radius of dots.")
177 (duration-log ,integer? "The 2-log of the note head duration,
178 i.e., @code{0} = whole note, @code{1} = half note, etc.")
180 (eccentricity ,number? "How asymmetrical to make a slur.
181 Positive means move the center to the right.")
182 (edge-height ,pair? "A pair of numbers specifying the heights of
183 the vertical edges: @code{(@var{left-height} . @var{right-height})}.")
184 (edge-text ,pair? "A pair specifying the texts to be set at the
185 edges: @code{(@var{left-text} . @var{right-text})}.")
186 (expand-limit ,integer? "Maximum number of measures expanded in
188 (extra-X-extent ,number-pair? "A grob is enlarged in
189 X@tie{}dimension by this much.")
190 (extra-Y-extent ,number-pair? "See @code{extra-X-extent}.")
192 (extra-dy ,number? "Slope glissandi this much extra.")
193 (extra-offset ,number-pair? "A pair representing an offset. This
194 offset is added just before outputting the symbol, so the typesetting
195 engine is completely oblivious to it. The values are measured in
196 @code{staff-space} units of the staff's @code{StaffSymbol}.")
197 (extra-spacing-width ,number-pair? "In the horizontal spacing
198 problem, we pad each item by this amount (by adding the @q{car} on the
199 left side of the item and adding the @q{cdr} on the right side of the
200 item). In order to make a grob take up no horizontal space at all,
201 set this to @code{(+inf.0 . -inf.0)}.")
203 (finger-code ,symbol? "Code for the type of fingering indication
204 in a fret diagram. Options include @code{none}, @code{in-dot}, and
205 @code{below-string}.")
206 (flag-count ,number? "The number of tremolo beams.")
207 (flag-style ,symbol? "A string determining what style of flag
208 glyph is typeset on a @code{Stem}. Valid options include @code{()}
209 and @code{mensural}. Additionally, @code{no-flag} switches off the
211 (font-encoding ,symbol? "The font encoding is the broadest
212 category for selecting a font. Options include: @code{fetaMusic},
213 @code{fetaNumber}, @code{TeX-text}, @code{TeX-math},
214 @code{fetaBraces}, @code{fetaDynamic}.")
215 (font-family ,symbol? "The font family is the broadest category
216 for selecting text fonts. Options include: @code{sans},
218 (font-name ,string? "Specifies a file name (without extension)
219 of the font to load. This setting overrides selection using
220 @code{font-family}, @code{font-series} and @code{font-shape}.")
221 (font-series ,symbol? "Select the series of a font. Choices
222 include @code{medium}, @code{bold}, @code{bold-narrow}, etc.")
223 (font-shape ,symbol? "Select the shape of a font. Choices
224 include @code{upright}, @code{italic}, @code{caps}.")
225 (font-size ,number? "The font size, compared to the @q{normal}
226 size. @code{0}@tie{}is style-sheet's normal size, @code{-1} is
227 smaller, @code{+1} is bigger. Each step of@tie{}1 is approximately
228 12% larger, 6@tie{}steps are exactly a factor@tie{}2 larger.
229 Fractional values are allowed.")
230 (force-hshift ,number? "This specifies a manual shift for notes
231 in collisions. The unit is the note head width of the first voice
232 note. This is used by @internalsref{note-collision-interface}.")
233 (forced ,boolean? "Manually forced accidental.")
234 (fraction ,number-pair? "Numerator and denominator of a time
236 (french-beaming ,boolean? "Use French beaming style for this
237 stem. The stem stops at the innermost beams.")
238 (fret-count ,integer? "The number of frets in a fret diagram.")
239 ;; ugh: double, change.
240 (full-size-change ,boolean? "Don't make a change clef smaller.")
242 (gap ,ly:dimension? "Size of a gap in a variable symbol.")
243 (gap-count ,integer? "Number of gapped beams for tremolo.")
244 (glyph ,string? "A string determining what @q{style} of glyph is
245 typeset. Valid choices depend on the function that is reading this
247 (glyph-name-alist ,list? "An alist of key-string pairs.")
248 (grow-direction ,ly:dir? "Crescendo or decrescendo?")
250 (hair-thickness ,number? "Thickness of the thin line in a bar
252 (head-direction ,ly:dir? "Are the note heads left or right in a
254 (height ,ly:dimension? "Height of an object in
255 @code{staff-space} units.")
256 (height-limit ,ly:dimension? "Maximum slur height: The longer the
257 slur, the closer it is to this height.")
258 (horizontal-shift ,integer? "An integer that identifies ranking
259 of @code{NoteColumn}s for horizontal shifting. This is used by
260 @internalsref{note-collision-interface}.")
261 (horizontal-skylines ,ly:skyline-pair? "Two skylines, one to the
262 left and one to the right of this grob.")
264 (ignore-collision ,boolean? "If set, don't do note collision
265 resolution on this @code{NoteColumn}.")
266 (implicit ,boolean? "Is this an implicit bass figure?")
267 (infinite-spacing-height ,boolean? "If true, then for the
268 purposes of horizontal spacing, treat this item as though it were
269 infinitely tall. That is, no object from another column is allowed to
270 stick above or below this item.")
271 (inspect-index ,integer? "If debugging is set, set beam and slur
272 configuration to this index, and print the respective scores.")
273 (inspect-quants ,number-pair? "If debugging is set,
274 set beam and slur quants to this position, and print the respective
277 (keep-fixed-while-stretching ,boolean? "A grob with this property
278 set to true is fixed relative to the staff above it when systems are
280 (keep-inside-line ,boolean? "If set, this column cannot have
281 things sticking into the margin.")
282 (kern ,ly:dimension? "Amount of extra white space to add. For
283 bar lines, this is the amount of space after a thick line.")
284 (knee ,boolean? "Is this beam kneed?")
285 (knee-spacing-correction ,number? "Factor for the optical
286 correction amount for kneed beams. Set between @code{0} for no
287 correction and @code{1} for full correction.")
289 (labels ,list? "List of labels (symbols) placed on a column")
290 (label-dir ,ly:dir? "Side to which a label is attached.
291 @code{-1} for left, @code{1}@tie{}for right.")
292 (layer ,number? "The output layer (a value between 0 and@tie{}2:
293 Layers define the order of printing objects. Objects in lower layers
294 are overprinted by objects in higher layers.")
295 (ledger-line-thickness ,number-pair? "The thickness of ledger
296 lines. It is the sum of 2@tie{}numbers: The first is the factor for
297 line thickness, and the second for staff space. Both contributions
299 (left-bound-info ,list? "An alist of properties for determining
300 attachments of spanners to edges.")
301 (left-padding ,ly:dimension? "The amount of space that is put
302 left to an object (e.g., a group of accidentals).")
303 (length ,ly:dimension? "User override for the stem length of
305 (length-fraction ,number? "Multiplier for lengths. Used for
306 determining ledger lines and stem lengths.")
307 (line-break-penalty ,number? "Penalty for a line break at this
308 column. This affects the choices of the line breaker; it avoids a
309 line break at a column with a positive penalty and prefer a line break
310 at a column with a negative penalty.")
311 (line-break-permission ,symbol? "Instructs the line breaker on
312 whether to put a line break at this column. Can be @code{force} or
314 (line-break-system-details ,list? "An alist of properties to use
315 if this column is the start of a system.")
316 (line-count ,integer? "The number of staff lines.")
317 (line-positions ,list? "Vertical positions of staff lines.")
318 (line-thickness ,number? "The thickness of the tie or slur
320 (long-text ,markup? "Text markup. See @ruser{Text
323 (max-beam-connect ,integer? "Maximum number of beams to connect
324 to beams from this stem. Further beams are typeset as beamlets.")
325 (max-stretch ,number? "The maximum amount that this
326 @code{VerticalAxisGroup} can be vertically stretched (for example, in
327 order to better fill a page).")
328 (measure-count ,integer? "The number of measures for a
329 multi-measure rest.")
330 (measure-length ,ly:moment? "Length of a measure. Used in some
331 spacing situations.")
332 (merge-differently-dotted ,boolean? "Merge note heads in
333 collisions, even if they have a different number of dots. This is
334 normal notation for some types of polyphonic music.
336 @code{merge-differently-dotted} only applies to opposing stem
337 directions (i.e., voice 1 &@tie{}2).")
338 (merge-differently-headed ,boolean? "Merge note heads in
339 collisions, even if they have different note heads. The
340 smaller of the two heads is rendered invisible. This is used in
341 polyphonic guitar notation. The value of this setting is used by
342 @internalsref{note-collision-interface}.
344 @code{merge-differently-headed} only applies to opposing stem
345 directions (i.e., voice 1 &@tie{}2).")
346 (minimum-X-extent ,number-pair? "Minimum size of an object in
347 X@tie{}dimension, measured in @code{staff-space} units.")
348 (minimum-Y-extent ,number-pair? "See @code{minimum-X-extent}.")
349 (minimum-distance ,ly:dimension? "Minimum distance between rest
351 (minimum-length ,ly:dimension? "Try to make a spanner at least
352 this long, normally in the horizontal direction. This requires an
353 appropriate callback for the @code{springs-and-rods} property. If
354 added to a @code{Tie}, this sets the minimum distance between
356 (minimum-length-fraction ,number? "Minimum length of ledger line
357 as fraction of note head size.")
358 (minimum-space ,ly:dimension? "Minimum distance that the victim
359 should move (after padding).")
361 (neutral-direction ,ly:dir? "Which direction to take in the
362 center of the staff.")
363 (neutral-position ,number? "Position (in half staff spaces) where
364 to flip the direction of custos stem.")
365 (next ,ly:grob? "Object that is next relation (e.g., the lyric
366 syllable following an extender.")
367 (no-alignment ,boolean? "If set, don't place this grob in a
368 VerticalAlignment; rather, place it using its own Y-offset callback")
369 (no-ledgers ,boolean? "If set, don't draw ledger lines on this
371 (no-stem-extend ,boolean? "If set, notes with ledger lines do not
372 get stems extending to the middle staff line.")
373 (non-default ,boolean? "Set for manually specified clefs.")
374 (non-musical ,boolean? "True if the grob belongs to a
375 @code{NonMusicalPaperColumn}.")
376 (note-names ,vector? "Vector of strings containing names for
377 easy-notation note heads.")
378 (number-type ,symbol? "Type of numbers to use in label. Choices
379 include @code{roman-lower}, @code{roman-upper}, and @code{arabic}.")
381 (outside-staff-horizontal-padding ,number? "By default, an
382 outside-staff-object can be placed so that is it very close to another
383 grob horizontally. If this property is set, the outside-staff-object
384 is raised so that it is not so close to its neighbour.")
385 (outside-staff-padding ,number? "The padding to place between
386 this grob and the staff when spacing according to
387 @code{outside-staff-priority}.")
388 (outside-staff-priority ,number? "If set, the grob is positioned
389 outside the staff in such a way as to avoid all collisions.
390 In case of a potential collision, the grob with the smaller
391 @code{outside-staff-priority} is closer to the staff.")
393 (packed-spacing ,boolean? "If set, the notes are spaced as
394 tightly as possible.")
395 (padding ,ly:dimension? "Add this much extra space between
396 objects that are next to each other.")
397 (page-break-penalty ,number? "Penalty for page break at this
398 column. This affects the choices of the page breaker; it avoids a
399 page break at a column with a positive penalty and prefer a page break
400 at a column with a negative penalty.")
401 (page-break-permission ,symbol? "Instructs the page breaker on
402 whether to put a page break at this column. Can be @code{force} or
404 (page-turn-penalty ,number? "Penalty for a page turn at this
405 column. This affects the choices of the page breaker; it avoids a
406 page turn at a column with a positive penalty and prefer a page turn
407 at a column with a negative penalty.")
408 (page-turn-permission ,symbol? "Instructs the page breaker on
409 whether to put a page turn at this column. Can be @code{force} or
411 (parenthesized ,boolean? "Parenthesize this grob.")
412 (positions ,number-pair? "Pair of staff coordinates @code{(@var{left}
413 . @var{right})}, where both @var{left} and @var{right} are in
414 @code{staff-space} units of the current staff.
416 For slurs, this value selects which slur candidate
417 to use; if extreme positions are requested, the closest one is taken.")
419 (ratio ,number? "Parameter for slur shape. The higher this
420 number, the quicker the slur attains its @code{height-limit}.")
421 (remove-empty ,boolean? "If set, remove group if it contains no
423 (remove-first ,boolean? "Remove the first staff of a orchestral
425 (restore-first ,boolean? "Print a natural before the
427 (rhythmic-location ,rhythmic-location? "Where (bar number,
428 measure position) in the score.")
429 (right-bound-info ,list? "An alist of properties for determining
430 attachments of spanners to edges.")
431 (right-padding ,ly:dimension? "Space to insert on the right side
432 of an object (e.g., between note and its accidentals).")
433 (rotation ,list? "Number of degrees to rotate this object, and
434 what point to rotate around. For example, @code{#'(45 0 0)} rotates
435 by 45 degrees around the center of this object.")
437 (same-direction-correction ,number? "Optical correction amount
438 for stems that are placed in tight configurations. This amount is
439 used for stems with the same direction to compensate for note-head to
441 (script-priority ,number? "A sorting key that determines in what
442 order a script is within a stack of scripts.")
443 (self-alignment-X ,number? "Specify alignment of an object. The
444 value @code{-1} means left aligned, @code{0}@tie{}centered, and
445 @code{1}@tie{}right-aligned in X@tie{}direction. Values in-between
446 may also be specified.")
447 (self-alignment-Y ,number? "Like @code{self-alignment-X} but for
449 (shorten-pair ,number-pair? "The lengths to shorten a
450 text-spanner on both sides, for example a pedal bracket. Positive
451 values shorten the text-spanner, while negative values lengthen it.")
452 (shortest-duration-space ,ly:dimension? "Start with this much
453 space for the shortest duration. This is expressed in
454 @code{spacing-increment} as unit. See also
455 @internalsref{spacing-spanner-interface}.")
456 (shortest-playing-duration ,ly:moment? "The duration of the
457 shortest playing here.")
458 (shortest-starter-duration ,ly:moment? "The duration of the
459 shortest note that starts here.")
460 (side-axis ,number? "If the value is @code{#X} (or
461 equivalently@tie{}@code{1}), the object is placed horizontally next
462 to the other object. If the value is @code{#Y} or@tie{}@code{0}, it
463 is placed vertically.")
464 (side-relative-direction ,ly:dir? "Multiply direction of
465 @code{direction-source} with this to get the direction of this
467 (size ,number? "Size of object, relative to standard size.")
468 (slope ,number? "The slope of this object.")
469 (slur-padding ,number? "Extra distance between slur and script.")
470 (space-alist ,list? "A table that specifies distances between
471 prefatory items, like clef and time-signature. The format is an alist
472 of spacing tuples: @code{(@var{break-align-symbol} @var{type}
473 . @var{distance})}, where @var{type} can be the symbols
474 @code{minimum-space} or @code{extra-space}.")
475 (space-to-barline ,boolean? "If set, the distance between a note
476 and the following non-musical column will be measured to the barline
477 instead of to the beginning of the non-musical column. If there is a
478 clef change followed by a barline, for example, this means that we will
479 try to space the non-musical column as though the clef is not there.")
480 (spacing-increment ,number? "Add this much space for a doubled
481 duration. Typically, the width of a note head. See also
482 @internalsref{spacing-spanner-interface}.")
483 (springs-and-rods ,boolean? "Dummy variable for triggering
485 (stacking-dir ,ly:dir? "Stack objects in which direction?")
486 (staff-padding ,ly:dimension? "Maintain this much space between
487 reference points and the staff. Its effect is to align objects of
488 differing sizes (like the dynamic @b{p} and @b{f}) on their
490 (staff-position ,number? "Vertical position, measured in half
491 staff spaces, counted from the middle line.")
492 (staff-space ,ly:dimension? "Amount of space between staff lines,
493 expressed in global @code{staff-space}.")
494 (stem-attachment ,number-pair? "A @code{(@var{x} . @var{y})} pair
495 where the stem attaches to the notehead.")
496 (stem-end-position ,number? "Where does the stem end (the end is
497 opposite to the support-head)?")
499 (stem-spacing-correction ,number? "Optical correction amount for
500 stems that are placed in tight configurations. For opposite
501 directions, this amount is the correction for two normal sized stems
502 that overlap completely.")
503 (stemlet-length ,number? "How long should a stem over a rest
505 (stencil ,ly:stencil? "The symbol to print.")
506 (stencils ,list? "Multiple stencils, used as intermediate
508 (strict-grace-spacing ,boolean? "If set, grace notes
509 are not spaced separately, but put before musical columns.")
510 (strict-note-spacing ,boolean? "If set, unbroken columns
511 with non-musical material (clefs, barlines, etc.) are not spaced
512 separately, but put before musical columns.")
513 (string-count ,integer? "The number of strings in a fret
515 (string-fret-finger-combinations ,list? "List consisting of
516 @code{(@var{string-number} @var{fret-number} @var{finger-number})}
518 (stroke-style ,string? "Set to @code{\"grace\"} to turn stroke
520 (style ,symbol? "This setting determines in what style a grob is
521 typeset. Valid choices depend on the @code{stencil} callback reading
524 (text ,markup? "Text markup. See @ruser{Text markup}.")
525 ;;FIXME -- Should both be the same?
526 (text-direction ,ly:dir? "This controls the ordering of the
527 words. The default @code{RIGHT} is for roman text. Arabic or Hebrew
528 should use @code{LEFT}.")
529 (thick-thickness ,number? "Bar line thickness, measured in
530 @code{line-thickness}.")
531 (thickness ,number? "Line thickness, generally measured in
532 @code{line-thickness}.")
533 (thin-kern ,number? "The space after a hair-line in a bar line.")
534 (threshold ,number-pair? "@code{(@var{min} . @var{max})}, where
535 @var{min} and @var{max} are dimensions in staff space.")
536 (to-barline ,boolean? "If true, the spanner will stop at that barline
537 just before it would otherwise stop.")
538 (tie-configuration ,list? "List of @code{(@var{position} .
539 @var{dir})} pairs, indicating the desired tie configuration, where
540 @var{position} is the offset from the center of the staff in staff
541 space and @var{dir} indicates the direction of the tie
542 (@code{1}=>up, @code{-1}=>down, @code{0}=>center). A non-pair entry
543 in the list causes the corresponding tie to be formatted
545 (transparent ,boolean? "This makes the grob invisible.")
547 (uniform-stretching ,boolean? "If set, items stretch
548 proportionally to their durations. This looks better in complex
549 polyphonic patterns.")
550 (used ,boolean? "If set, this spacing column is kept in the
553 (vertical-skylines ,ly:skyline-pair? "Two skylines, one above and
554 one below this grob.")
556 (when ,ly:moment? "Global time step associated with this column
558 (width ,ly:dimension? "The width of a grob measured in staff
560 (word-space ,ly:dimension? "Space to insert between words in
563 (zigzag-length ,ly:dimension? "The length of the lines of a
564 zigzag, relative to @code{zigzag-width}. A value of@tie{}@code{1}
565 gives 60-degree zigzags.")
566 (zigzag-width ,ly:dimension? "The width of one zigzag squiggle.
567 This number is adjusted slightly so that the glissando line can
568 be constructed from a whole number of squiggles.")
576 (define (define-internal-grob-property symbol type? description)
577 (define-grob-property symbol type? description)
578 (set-object-property! symbol 'backend-internal #t)
583 (define-public all-internal-grob-properties
586 (apply define-internal-grob-property x))
590 ;; grobs & grob arrays. (alphabetical)
591 (X-common ,ly:grob? "Common reference point for axis group.")
593 (Y-common ,ly:grob? "See @code{X-common}.")
595 (accidental-grob ,ly:grob? "The accidental for this note.")
596 (accidental-grobs ,list? "An alist with @code{(@var{notename} .
597 @var{groblist})} entries.")
598 (adjacent-pure-heights ,vector? "Used by a @code{VerticalAxisGroup} to
599 cache the @code{Y-extent}s of different column ranges.")
600 (adjacent-hairpins ,ly:grob-array? "A list of directly neighboring
602 (all-elements ,ly:grob-array? "A list of all grobs in this line. Its
603 function is to protect objects from being garbage collected.")
604 (arpeggio ,ly:grob? "A pointer to an @code{Arpeggio} object.")
605 (axis-group-parent-X ,ly:grob? "Containing X@tie{}axis group.")
606 (axis-group-parent-Y ,ly:grob? "Containing Y@tie{}axis group.")
608 (bar-extent ,number-pair? "The Y-extent of the actual barline.
609 This may differ from 'Y-extent because it does not include the dots in
611 (bars ,ly:grob-array? "A list of bar line pointers.")
612 (beam ,ly:grob? "A pointer to the beam, if applicable.")
613 (bounded-by-me ,ly:grob-array? "A list of spanners that have this
614 column as start/begin point. Only columns that have grobs or act as
616 (bracket ,ly:grob? "The bracket for a number.")
618 (columns ,ly:grob-array? "A list of grobs, typically containing
619 @code{PaperColumn} or @code{NoteColumn} objects.")
620 (conditional-elements ,ly:grob-array? "Internal use only.")
621 (cross-staff ,boolean? "For a beam or a stem, this is true if we
622 depend on inter-staff spacing.")
624 (direction-source ,ly:grob? "In case @code{side-relative-direction} is
625 set, which grob to get the direction from.")
626 (dot ,ly:grob? "A reference to a @code{Dots} object.")
627 (dots ,ly:grob-array? "Multiple @code{Dots} objects.")
629 (elements ,ly:grob-array? "A list of grobs; the type is depending on
630 the grob where this is set in.")
631 (encompass-objects ,ly:grob-array? "Objects that a slur should avoid
632 in addition to notes and stems.")
634 (figures ,ly:grob-array? "Figured bass objects for continuation line.")
636 (glyph-name ,string? "The glyph name within the font.")
637 (grace-spacing ,ly:grob? "A run of grace notes.")
639 (heads ,ly:grob-array? "A list of note heads.")
641 (important-column-ranks ,vector? "A cache of columns that contain
642 @code{items-worth-living} data.")
643 (items-worth-living ,ly:grob-array? "A list of interesting items. If
644 empty in a particular staff, then that staff is erased.")
646 (left-items ,ly:grob-array? "DOCME")
647 (left-neighbors ,ly:grob-array? "A list of @code{spacing-wishes} grobs
648 that are close to the current column.
650 The closest @code{spacing-wishes} determine the actual distances between the
653 (normal-stems ,ly:grob-array? "An array of visible stems.")
654 (note-columns ,pair? "A list of @code{NoteColumn} grobs.")
655 (note-head ,ly:grob? "A single note head.")
656 (note-heads ,ly:grob-array? "A list of note head grobs.")
658 (padding-pairs ,list? "An alist mapping @code{(@var{name} . @var{name})}
660 (pedal-text ,ly:grob? "A pointer to the text of a mixed-style piano
662 (pure-Y-common ,ly:grob? "A cache of the
663 @code{common_refpoint_of_array} of the @code{elements} grob set.")
664 (pure-Y-offset-in-progress ,boolean? "A debugging aid for catching
665 cyclic dependencies.")
666 (pure-relevant-items ,ly:grob-array? "A subset of elements that are
667 relevant for finding the @code{pure-Y-extent}.")
668 (pure-relevant-spanners ,ly:grob-array? "A subset of elements that are
669 relevant for finding the @code{pure-Y-extent}.")
671 (rest ,ly:grob? "A pointer to a @code{Rest} object.")
672 (rest-collision ,ly:grob? "A rest collision that a rest is in.")
673 (rests ,ly:grob-array? "A list of rest objects.")
674 (right-items ,ly:grob-array? "DOCME")
675 (right-neighbors ,ly:grob-array? "See @code{left-neighbors}.")
677 (separation-item ,ly:grob? "A separation item.")
678 (side-support-elements ,ly:grob-array? "The side support, a list of
680 (slur ,ly:grob? "A pointer to a @code{Slur} object.")
681 (spaceable-staves ,ly:grob-array? "Objects to be spaced during page
683 (spacing ,ly:grob? "The spacing spanner governing this section.")
684 (spacing-wishes ,ly:grob-array? "List of note spacing or staff spacing
686 (staff-symbol ,ly:grob? "The staff symbol grob that we are in.")
687 (stem ,ly:grob? "A pointer to a @code{Stem} object.")
688 (stems ,ly:grob-array? "A list of stem objects, corresponding to the
689 notes that the arpeggio has to be before.")
691 (tie ,ly:grob? "A pointer to a @code{Tie} object.")
692 (tremolo-flag ,ly:grob? "The tremolo object on a stem.")
693 (tuplet-number ,ly:grob? "The number for a bracket.")
694 (tuplets ,ly:grob-array? "A list of smaller tuplet brackets.")
698 (begin-of-line-visible ,boolean? "Used for marking @code{ChordNames}
699 that should only show changes.")
701 (cause ,scheme? "Any kind of causation objects (i.e., music, or perhaps
702 translator) that was the cause for this grob.")
703 (circled-tip ,boolean? "Put a circle at start/end of hairpins (al/del
706 (delta-position ,number? "The vertical position difference.")
707 (details ,list? "Alist of parameters for detailed grob behavior.
709 More information on the allowed parameters can be found by inspecting
710 @file{lily/slur-scoring.cc}, @file{lily/beam-quanting.cc}, and
711 @file{lily/tie-formatting-problem.cc}. Setting @code{debug-tie-scoring},
712 @code{debug-beam-scoring} or @code{debug-slur-scoring} also provides
715 (font ,ly:font-metric? "A cached font metric object.")
717 (head-width ,ly:dimension? "The width of this ligature head.")
719 (ideal-distances ,list? "@code{(@var{obj} . (@var{dist} .
720 @var{strength}))} pairs.")
721 (interfaces ,list? "A list of symbols indicating the interfaces
722 supported by this object. It is initialized from the @code{meta} field.")
724 (least-squares-dy ,number? "The ideal beam slope, without damping.")
726 (meta ,list? "Provide meta information. It is an alist with the
727 entries @code{name} and @code{interfaces}.")
728 (minimum-distances ,list? "A list of rods that have the format
729 @code{(@var{obj} . @var{dist})}.")
731 (positioning-done ,boolean? "Used to signal that a positioning element
732 did its job. This ensures that a positioning is only done once.")
733 (pure-Y-extent ,number-pair? "The estimated height of a system.")
735 (quant-score ,string? "The beam quanting score; stored for
737 (quantize-position ,boolean? "If set, a vertical alignment is aligned
738 to be within staff spaces.")
739 (quantized-positions ,number-pair? "The beam positions after
742 (script-stencil ,pair? "A pair @code{(@var{type} . @var{arg})} which
743 acts as an index for looking up a @code{Stencil} object.")
744 (shorten ,ly:dimension? "The amount of space that a stem is shortened.
745 Internally used to distribute beam shortening over stems.")
746 (skyline-distance ,number? "The distance between this staff and the
747 next one, as determined by a skyline algorithm.")
748 (skyline-horizontal-padding ,number? "For determining the vertical
749 distance between two staves, it is possible to have a configuration which
750 would result in a tight interleaving of grobs from the top staff and the
751 bottom staff. The larger this parameter is, the farther apart the staves
752 are placed in such a configuration.")
753 (stem-info ,pair? "A cache of stem parameters.")
755 (use-breve-rest ,boolean? "Use breve rests for measures longer
762 ;; There are too many properties for ancient notation;
763 ;; probably neume-types (a list of symbols) would also work.
765 ;; However, such a list would consist of a couple of dozens of
766 ;; entries, since head prefixes may be combined in many ways. If
767 ;; the macros in `gregorian-init.ly' would directly set prefix-set,
768 ;; all the head prefixes could be junked; however, such macros
769 ;; would be quite numerous, I guess. --jr
771 (add-cauda ,boolean? "Does this flexa require an additional cauda on
773 (add-join ,boolean? "Is this ligature head-joined with the next one
774 by a vertical line?")
775 (add-stem ,boolean? "Is this ligature head a virga and therefore needs
776 an additional stem on the right side?")
777 (ascendens ,boolean? "Is this neume of ascending type?")
778 (auctum ,boolean? "Is this neume liquescentically augmented?")
780 (cavum ,boolean? "Is this neume outlined?")
781 (context-info ,integer? "Within a ligature, the final glyph or shape of
782 a head may be affected by the left and/or right neighbour head.
783 @code{context-info} holds for each head such information about the left and
784 right neighbour, encoded as a bit mask.")
786 (descendens ,boolean? "Is this neume of descendent type?")
787 (deminutum ,boolean? "Is this neume deminished?")
789 (flexa-height ,ly:dimension? "The height of a flexa shape in a ligature
790 grob (in @code{staff-space} units).")
791 (flexa-width ,ly:dimension? "The width of a flexa shape in a
792 ligature grob in (in @code{staff-space} units).")
794 (inclinatum ,boolean? "Is this neume an inclinatum?")
796 (join-heads ,boolean? "Whether to join the note heads of an ambitus
797 grob with a vertical line.")
798 (join-right-amount ,number? "DOCME")
800 (linea ,boolean? "Attach vertical lines to this neume?")
802 (oriscus ,boolean? "Is this neume an oriscus?")
804 (pes-or-flexa ,boolean? "Shall this neume be joined with the previous
806 (prefix-set ,number? "A bit mask that holds all Gregorian head
807 prefixes, such as @code{\\virga} or @code{\\quilisma}.")
808 (primitive ,integer? "A pointer to a ligature primitive, i.e., an item
809 similar to a note head that is part of a ligature.")
811 (quilisma ,boolean? "Is this neume a quilisma?")
813 (stropha ,boolean? "Is this neume a stropha?")
815 (virga ,boolean? "Is this neume a virga?")
817 (x-offset ,ly:dimension? "Extra horizontal offset for ligature heads.")
820 ;; fret-diagrams extra properties
821 (mute-string ,string? "String to be used to indicate a muted string in
823 (open-string ,string? "A string to be used to indicate an open string
825 (orientation ,symbol? "The orientation of a fret-diagram. Options
826 include @code{normal} and @code{landscape}.")
827 (xo-font-magnification ,number? "Magnification used for mute and open
828 string indicators in fret diagrams.")
832 (define-public all-backend-properties
834 all-internal-grob-properties
835 all-user-grob-properties))