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-count ,number? "The number of tremolo beams.")
208 (flag-style ,symbol? "A string determining what style of flag
209 glyph is typeset on a @code{Stem}. Valid options include @code{()}
210 and @code{mensural}. Additionally, @code{no-flag} switches off the
212 (font-encoding ,symbol? "The font encoding is the broadest
213 category for selecting a font. Options include: @code{fetaMusic},
214 @code{fetaNumber}, @code{TeX-text}, @code{TeX-math},
215 @code{fetaBraces}, @code{fetaDynamic}.")
216 (font-family ,symbol? "The font family is the broadest category
217 for selecting text fonts. Options include: @code{sans},
219 (font-name ,string? "Specifies a file name (without extension)
220 of the font to load. This setting overrides selection using
221 @code{font-family}, @code{font-series} and @code{font-shape}.")
222 (font-series ,symbol? "Select the series of a font. Choices
223 include @code{medium}, @code{bold}, @code{bold-narrow}, etc.")
224 (font-shape ,symbol? "Select the shape of a font. Choices
225 include @code{upright}, @code{italic}, @code{caps}.")
226 (font-size ,number? "The font size, compared to the
227 @q{normal}@tie{}size. @code{0}@tie{}is style-sheet's normal size,
228 @code{-1} is smaller, @code{+1} is bigger. Each step of@tie{}1 is
229 approximately 12% larger; 6@tie{}steps are exactly a factor@tie{}2 larger.
230 Fractional values are allowed.")
231 (force-hshift ,number? "This specifies a manual shift for notes
232 in collisions. The unit is the note head width of the first voice
233 note. This is used by @rinternals{note-collision-interface}.")
234 (forced ,boolean? "Manually forced accidental.")
235 (fraction ,number-pair? "Numerator and denominator of a time
237 (french-beaming ,boolean? "Use French beaming style for this
238 stem. The stem stops at the innermost beams.")
240 (fret-diagram-details ,list? "An alist of detailed grob properties
241 for fret diagrams. Each alist entry consists of a
242 (@code{property} . @code{value}) pair.
243 The properties which can be included in fret-diagram-details
244 include the following:
247 @code{barre-type} -- Type of barre indication used.
248 Choices include @code{curved} and @code{straight}.
250 @code{dot-color} -- Color of dots. Options include
251 @code{black} and @code{white}.
253 @code{dot-label-font-mag} -- Magnification for font used to
254 label fret dots. Default value 1.
256 @code{dot-radius} -- Radius of dots.
258 @code{finger-code} -- Code for the type of fingering indication used.
259 Options include @code{none}, @code{in-dot}, and
262 @code{fret-count} -- The number of frets.
264 @code{fret-label-font-mag} -- The magnification of the font used to label
265 the lowest fret number. Default 0.5
267 @code{fret-label-vertical-offset} -- The vertical offset of the fret label
268 from the fret. Default -0.2
270 @code{label-dir} -- Side to which the fret label is attached.
271 @code{-1}, @code{#LEFT}, or @code{#DOWN} for left or down;
272 @code{1}, @code{#RIGHT}, or @code{#UP} for right or up.
274 @code{mute-string} -- Character string to be used to indicate muted string.
276 @code{number-type} -- Type of numbers to use in fret label. Choices
277 include @code{roman-lower}, @code{roman-upper}, and @code{arabic}.
279 @code{open-string} -- Character string to be used to indicate open string.
281 @code{orientation} -- Orientation of fret-diagram. Options include
282 @code{normal} and @code{landscape}
284 @code{string-count} -- The number of strings.
286 @code{string-label-font-mag} -- The magnification of the font used to label fingerings
287 at the string, rather than in the dot. Default value 0.6.
289 @code{top-fret-thickness} -- The thickness of the top fret line, as a multiple
290 of the standard thickness. Default value 3.
292 @code{xo-font-magnification} -- Magnification used for mute and
293 open string indicators. Default value 0.5.
295 @code{xo-padding} -- Padding for open and mute indicators from top fret. Default
300 ;; ugh: double, change.
301 (full-length-padding ,number? "How much padding to use at the right side of a full-length tuplet bracket.")
302 (full-length-to-extent ,boolean? "Run to the extent of the column for a full-length tuplet bracket.")
304 (full-size-change ,boolean? "Don't make a change clef smaller.")
306 (gap ,ly:dimension? "Size of a gap in a variable symbol.")
307 (gap-count ,integer? "Number of gapped beams for tremolo.")
308 (glyph ,string? "A string determining what @q{style} of glyph is
309 typeset. Valid choices depend on the function that is reading this
311 (glyph-name-alist ,list? "An alist of key-string pairs.")
312 (grow-direction ,ly:dir? "Crescendo or decrescendo?")
314 (hair-thickness ,number? "Thickness of the thin line in a bar
316 (head-direction ,ly:dir? "Are the note heads left or right in a
318 (height ,ly:dimension? "Height of an object in
319 @code{staff-space} units.")
320 (height-limit ,ly:dimension? "Maximum slur height: The longer the
321 slur, the closer it is to this height.")
322 (horizontal-shift ,integer? "An integer that identifies ranking
323 of @code{NoteColumn}s for horizontal shifting. This is used by
324 @rinternals{note-collision-interface}.")
325 (horizontal-skylines ,ly:skyline-pair? "Two skylines, one to the
326 left and one to the right of this grob.")
328 (ignore-collision ,boolean? "If set, don't do note collision
329 resolution on this @code{NoteColumn}.")
330 (implicit ,boolean? "Is this an implicit bass figure?")
331 (inspect-index ,integer? "If debugging is set, set beam and slur
332 configuration to this index, and print the respective scores.")
333 (inspect-quants ,number-pair? "If debugging is set,
334 set beam and slur quants to this position, and print the respective
337 (keep-fixed-while-stretching ,boolean? "A grob with this property
338 set to true is fixed relative to the staff above it when systems are
340 (keep-inside-line ,boolean? "If set, this column cannot have
341 objects sticking into the margin.")
342 (kern ,ly:dimension? "Amount of extra white space to add. For
343 bar lines, this is the amount of space after a thick line.")
344 (knee ,boolean? "Is this beam kneed?")
345 (knee-spacing-correction ,number? "Factor for the optical
346 correction amount for kneed beams. Set between @code{0} for no
347 correction and @code{1} for full correction.")
349 (labels ,list? "List of labels (symbols) placed on a column")
350 (layer ,number? "The output layer (a value between 0 and@tie{}2:
351 Layers define the order of printing objects. Objects in lower layers
352 are overprinted by objects in higher layers.")
353 (ledger-line-thickness ,number-pair? "The thickness of ledger
354 lines. It is the sum of 2@tie{}numbers: The first is the factor for
355 line thickness, and the second for staff space. Both contributions
357 (left-bound-info ,list? "An alist of properties for determining
358 attachments of spanners to edges.")
359 (left-padding ,ly:dimension? "The amount of space that is put
360 left to an object (e.g., a group of accidentals).")
361 (length ,ly:dimension? "User override for the stem length of
363 (length-fraction ,number? "Multiplier for lengths. Used for
364 determining ledger lines and stem lengths.")
365 (line-break-penalty ,number? "Penalty for a line break at this
366 column. This affects the choices of the line breaker; it avoids a
367 line break at a column with a positive penalty and prefers a line break
368 at a column with a negative penalty.")
369 (line-break-permission ,symbol? "Instructs the line breaker on
370 whether to put a line break at this column. Can be @code{force} or
372 (line-break-system-details ,list? "An alist of properties to use
373 if this column is the start of a system.")
374 (line-count ,integer? "The number of staff lines.")
375 (line-positions ,list? "Vertical positions of staff lines.")
376 (line-thickness ,number? "The thickness of the tie or slur
378 (long-text ,markup? "Text markup. See @ruser{Formatting
381 (max-beam-connect ,integer? "Maximum number of beams to connect
382 to beams from this stem. Further beams are typeset as beamlets.")
383 (max-stretch ,number? "The maximum amount that this
384 @code{VerticalAxisGroup} can be vertically stretched (for example, in
385 order to better fill a page).")
386 (measure-count ,integer? "The number of measures for a
387 multi-measure rest.")
388 (measure-length ,ly:moment? "Length of a measure. Used in some
389 spacing situations.")
390 (merge-differently-dotted ,boolean? "Merge note heads in
391 collisions, even if they have a different number of dots. This is
392 normal notation for some types of polyphonic music.
394 @code{merge-differently-dotted} only applies to opposing stem
395 directions (i.e., voice 1 &@tie{}2).")
396 (merge-differently-headed ,boolean? "Merge note heads in
397 collisions, even if they have different note heads. The
398 smaller of the two heads is rendered invisible. This is used in
399 polyphonic guitar notation. The value of this setting is used by
400 @rinternals{note-collision-interface}.
402 @code{merge-differently-headed} only applies to opposing stem
403 directions (i.e., voice 1 &@tie{}2).")
404 (minimum-X-extent ,number-pair? "Minimum size of an object in
405 X@tie{}dimension, measured in @code{staff-space} units.")
406 (minimum-Y-extent ,number-pair? "Minimum size of an object in
407 Y@tie{}dimension, measured in @code{staff-space} units.")
408 (minimum-distance ,ly:dimension? "Minimum distance between rest
410 (minimum-length ,ly:dimension? "Try to make a spanner at least
411 this long, normally in the horizontal direction. This requires an
412 appropriate callback for the @code{springs-and-rods} property. If
413 added to a @code{Tie}, this sets the minimum distance between
415 (minimum-length-fraction ,number? "Minimum length of ledger line
416 as fraction of note head size.")
417 (minimum-space ,ly:dimension? "Minimum distance that the victim
418 should move (after padding).")
420 (neutral-direction ,ly:dir? "Which direction to take in the
421 center of the staff.")
422 (neutral-position ,number? "Position (in half staff spaces) where
423 to flip the direction of custos stem.")
424 (next ,ly:grob? "Object that is next relation (e.g., the lyric
425 syllable following an extender.")
426 (no-alignment ,boolean? "If set, don't place this grob in a
427 @code{VerticalAlignment}; rather, place it using its own @code{Y-offset}
429 (no-ledgers ,boolean? "If set, don't draw ledger lines on this
431 (no-stem-extend ,boolean? "If set, notes with ledger lines do not
432 get stems extending to the middle staff line.")
433 (non-default ,boolean? "Set for manually specified clefs.")
434 (non-musical ,boolean? "True if the grob belongs to a
435 @code{NonMusicalPaperColumn}.")
436 (note-names ,vector? "Vector of strings containing names for
437 easy-notation note heads.")
439 (outside-staff-horizontal-padding ,number? "By default, an
440 outside-staff-object can be placed so that is it very close to another
441 grob horizontally. If this property is set, the outside-staff-object
442 is raised so that it is not so close to its neighbor.")
443 (outside-staff-padding ,number? "The padding to place between
444 this grob and the staff when spacing according to
445 @code{outside-staff-priority}.")
446 (outside-staff-priority ,number? "If set, the grob is positioned
447 outside the staff in such a way as to avoid all collisions.
448 In case of a potential collision, the grob with the smaller
449 @code{outside-staff-priority} is closer to the staff.")
451 (packed-spacing ,boolean? "If set, the notes are spaced as
452 tightly as possible.")
453 (padding ,ly:dimension? "Add this much extra space between
454 objects that are next to each other.")
455 (page-break-penalty ,number? "Penalty for page break at this
456 column. This affects the choices of the page breaker; it avoids a
457 page break at a column with a positive penalty and prefers a page break
458 at a column with a negative penalty.")
459 (page-break-permission ,symbol? "Instructs the page breaker on
460 whether to put a page break at this column. Can be @code{force} or
462 (page-turn-penalty ,number? "Penalty for a page turn at this
463 column. This affects the choices of the page breaker; it avoids a
464 page turn at a column with a positive penalty and prefers a page turn
465 at a column with a negative penalty.")
466 (page-turn-permission ,symbol? "Instructs the page breaker on
467 whether to put a page turn at this column. Can be @code{force} or
469 (parenthesized ,boolean? "Parenthesize this grob.")
470 (positions ,number-pair? "Pair of staff coordinates
471 @code{(@var{left} . @var{right})}, where both @var{left} and
472 @var{right} are in @code{staff-space} units of the current staff.
473 For slurs, this value selects which slur candidate to use; if
474 extreme positions are requested, the closest one is taken.")
475 (prefer-dotted-right ,boolean? "For note collisions, prefer to
476 shift dotted up-note to the right, rather than shifting just the
479 (ratio ,number? "Parameter for slur shape. The higher this
480 number, the quicker the slur attains its @code{height-limit}.")
481 (remove-empty ,boolean? "If set, remove group if it contains no
483 (remove-first ,boolean? "Remove the first staff of a orchestral
485 (restore-first ,boolean? "Print a natural before the
487 (rhythmic-location ,rhythmic-location? "Where (bar number,
488 measure position) in the score.")
489 (right-bound-info ,list? "An alist of properties for determining
490 attachments of spanners to edges.")
491 (right-padding ,ly:dimension? "Space to insert on the right side
492 of an object (e.g., between note and its accidentals).")
493 (rotation ,list? "Number of degrees to rotate this object, and
494 what point to rotate around. For example, @code{#'(45 0 0)} rotates
495 by 45 degrees around the center of this object.")
497 (same-direction-correction ,number? "Optical correction amount
498 for stems that are placed in tight configurations. This amount is
499 used for stems with the same direction to compensate for note head to
501 (script-priority ,number? "A sorting key that determines in what
502 order a script is within a stack of scripts.")
503 (self-alignment-X ,number? "Specify alignment of an object. The
504 value @code{-1} means left aligned, @code{0}@tie{}centered, and
505 @code{1}@tie{}right-aligned in X@tie{}direction. Other numerical
506 values may also be specified.")
507 (self-alignment-Y ,number? "Like @code{self-alignment-X} but for
509 (shorten-pair ,number-pair? "The lengths to shorten a
510 text-spanner on both sides, for example a pedal bracket. Positive
511 values shorten the text-spanner, while negative values lengthen it.")
512 (shortest-duration-space ,ly:dimension? "Start with this much
513 space for the shortest duration. This is expressed in
514 @code{spacing-increment} as unit. See also
515 @rinternals{spacing-spanner-interface}.")
516 (shortest-playing-duration ,ly:moment? "The duration of the
517 shortest note playing here.")
518 (shortest-starter-duration ,ly:moment? "The duration of the
519 shortest note that starts here.")
520 (side-axis ,number? "If the value is @code{#X} (or
521 equivalently@tie{}@code{0}), the object is placed horizontally next
522 to the other object. If the value is @code{#Y} or@tie{}@code{1}, it
523 is placed vertically.")
524 (side-relative-direction ,ly:dir? "Multiply direction of
525 @code{direction-source} with this to get the direction of this
527 (size ,number? "Size of object, relative to standard size.")
528 (slope ,number? "The slope of this object.")
529 (slur-padding ,number? "Extra distance between slur and script.")
530 (space-alist ,list? "A table that specifies distances between
531 prefatory items, like clef and time-signature. The format is an alist
532 of spacing tuples: @code{(@var{break-align-symbol} @var{type}
533 . @var{distance})}, where @var{type} can be the symbols
534 @code{minimum-space} or @code{extra-space}.")
535 (space-to-barline ,boolean? "If set, the distance between a note
536 and the following non-musical column will be measured to the bar line
537 instead of to the beginning of the non-musical column. If there is a
538 clef change followed by a bar line, for example, this means that we will
539 try to space the non-musical column as though the clef is not there.")
540 (spacing-increment ,number? "Add this much space for a doubled
541 duration. Typically, the width of a note head. See also
542 @rinternals{spacing-spanner-interface}.")
543 (springs-and-rods ,boolean? "Dummy variable for triggering
545 (stacking-dir ,ly:dir? "Stack objects in which direction?")
546 (staff-padding ,ly:dimension? "Maintain this much space between
547 reference points and the staff. Its effect is to align objects of
548 differing sizes (like the dynamics @b{p} and @b{f}) on their
550 (staff-position ,number? "Vertical position, measured in half
551 staff spaces, counted from the middle line.")
552 (staff-space ,ly:dimension? "Amount of space between staff lines,
553 expressed in global @code{staff-space}.")
554 (stem-attachment ,number-pair? "An @code{(@var{x} . @var{y})} pair
555 where the stem attaches to the notehead.")
556 (stem-end-position ,number? "Where does the stem end (the end is
557 opposite to the support-head)?")
559 (stem-spacing-correction ,number? "Optical correction amount for
560 stems that are placed in tight configurations. For opposite
561 directions, this amount is the correction for two normal sized stems
562 that overlap completely.")
563 (stemlet-length ,number? "How long should a stem over a rest
565 (stencil ,ly:stencil? "The symbol to print.")
566 (stencils ,list? "Multiple stencils, used as intermediate
568 (strict-grace-spacing ,boolean? "If set, grace notes
569 are not spaced separately, but put before musical columns.")
570 (strict-note-spacing ,boolean? "If set, unbroken columns
571 with non-musical material (clefs, bar lines, etc.) are not spaced
572 separately, but put before musical columns.")
573 (stroke-style ,string? "Set to @code{\"grace\"} to turn stroke
575 (style ,symbol? "This setting determines in what style a grob is
576 typeset. Valid choices depend on the @code{stencil} callback reading
579 (text ,markup? "Text markup. See @ruser{Formatting text}.")
580 ;;FIXME -- Should both be the same?
581 (text-direction ,ly:dir? "This controls the ordering of the
582 words. The default @code{RIGHT} is for roman text. Arabic or Hebrew
583 should use @code{LEFT}.")
584 (thick-thickness ,number? "Bar line thickness, measured in
585 @code{line-thickness}.")
586 (thickness ,number? "Line thickness, generally measured in
587 @code{line-thickness}.")
588 (thin-kern ,number? "The space after a hair-line in a bar line.")
589 (threshold ,number-pair? "@code{(@var{min} . @var{max})}, where
590 @var{min} and @var{max} are dimensions in staff space.")
591 (to-barline ,boolean? "If true, the spanner will stop at the bar line
592 just before it would otherwise stop.")
593 (tie-configuration ,list? "List of @code{(@var{position} .
594 @var{dir})} pairs, indicating the desired tie configuration, where
595 @var{position} is the offset from the center of the staff in staff
596 space and @var{dir} indicates the direction of the tie
597 (@code{1}=>up, @code{-1}=>down, @code{0}=>center). A non-pair entry
598 in the list causes the corresponding tie to be formatted
600 (transparent ,boolean? "This makes the grob invisible.")
602 (uniform-stretching ,boolean? "If set, items stretch
603 proportionally to their durations. This looks better in complex
604 polyphonic patterns.")
605 (used ,boolean? "If set, this spacing column is kept in the
608 (vertical-skylines ,ly:skyline-pair? "Two skylines, one above and
609 one below this grob.")
611 (when ,ly:moment? "Global time step associated with this column
613 (width ,ly:dimension? "The width of a grob measured in staff
615 (word-space ,ly:dimension? "Space to insert between words in
618 (zigzag-length ,ly:dimension? "The length of the lines of a
619 zigzag, relative to @code{zigzag-width}. A value of@tie{}@code{1}
620 gives 60-degree zigzags.")
621 (zigzag-width ,ly:dimension? "The width of one zigzag squiggle.
622 This number is adjusted slightly so that the glissando line can
623 be constructed from a whole number of squiggles.")
631 (define (define-internal-grob-property symbol type? description)
632 (define-grob-property symbol type? description)
633 (set-object-property! symbol 'backend-internal #t)
638 (define-public all-internal-grob-properties
641 (apply define-internal-grob-property x))
645 ;; grobs & grob arrays. (alphabetical)
646 (X-common ,ly:grob? "Common reference point for axis group.")
648 (Y-common ,ly:grob? "See @code{X-common}.")
650 (accidental-grob ,ly:grob? "The accidental for this note.")
651 (accidental-grobs ,list? "An alist with @code{(@var{notename} .
652 @var{groblist})} entries.")
653 (adjacent-pure-heights ,vector? "Used by a @code{VerticalAxisGroup} to
654 cache the @code{Y-extent}s of different column ranges.")
655 (adjacent-hairpins ,ly:grob-array? "A list of directly neighboring
657 (all-elements ,ly:grob-array? "A list of all grobs in this line. Its
658 function is to protect objects from being garbage collected.")
659 (arpeggio ,ly:grob? "A pointer to an @code{Arpeggio} object.")
660 (axis-group-parent-X ,ly:grob? "Containing X@tie{}axis group.")
661 (axis-group-parent-Y ,ly:grob? "Containing Y@tie{}axis group.")
663 (bar-extent ,number-pair? "The Y-extent of the actual bar line.
664 This may differ from @code{Y-extent} because it does not include the dots in
666 (bars ,ly:grob-array? "A list of bar line pointers.")
667 (beam ,ly:grob? "A pointer to the beam, if applicable.")
668 (bounded-by-me ,ly:grob-array? "A list of spanners that have this
669 column as start/begin point. Only columns that have grobs or act as
671 (bracket ,ly:grob? "The bracket for a number.")
673 (columns ,ly:grob-array? "A list of grobs, typically containing
674 @code{PaperColumn} or @code{NoteColumn} objects.")
675 (conditional-elements ,ly:grob-array? "Internal use only.")
676 (cross-staff ,boolean? "For a beam or a stem, this is true if we
677 depend on inter-staff spacing.")
679 (direction-source ,ly:grob? "In case @code{side-relative-direction} is
680 set, which grob to get the direction from.")
681 (dot ,ly:grob? "A reference to a @code{Dots} object.")
682 (dots ,ly:grob-array? "Multiple @code{Dots} objects.")
684 (elements ,ly:grob-array? "A list of grobs; the type is depending on
685 the grob where this is set in.")
686 (encompass-objects ,ly:grob-array? "Objects that a slur should avoid
687 in addition to notes and stems.")
689 (figures ,ly:grob-array? "Figured bass objects for continuation line.")
691 (glyph-name ,string? "The glyph name within the font.")
692 (grace-spacing ,ly:grob? "A run of grace notes.")
694 (heads ,ly:grob-array? "A list of note heads.")
696 (important-column-ranks ,vector? "A cache of columns that contain
697 @code{items-worth-living} data.")
698 (items-worth-living ,ly:grob-array? "A list of interesting items. If
699 empty in a particular staff, then that staff is erased.")
701 (left-items ,ly:grob-array? "DOCME")
702 (left-neighbors ,ly:grob-array? "A list of @code{spacing-wishes} grobs
703 that are close to the current column.
705 The closest @code{spacing-wishes} determine the actual distances between the
708 (normal-stems ,ly:grob-array? "An array of visible stems.")
709 (note-columns ,pair? "A list of @code{NoteColumn} grobs.")
710 (note-head ,ly:grob? "A single note head.")
711 (note-heads ,ly:grob-array? "A list of note head grobs.")
713 (padding-pairs ,list? "An alist mapping @code{(@var{name} . @var{name})}
715 (pedal-text ,ly:grob? "A pointer to the text of a mixed-style piano
717 (pure-Y-common ,ly:grob? "A cache of the
718 @code{common_refpoint_of_array} of the @code{elements} grob set.")
719 (pure-Y-offset-in-progress ,boolean? "A debugging aid for catching
720 cyclic dependencies.")
721 (pure-relevant-items ,ly:grob-array? "A subset of elements that are
722 relevant for finding the @code{pure-Y-extent}.")
723 (pure-relevant-spanners ,ly:grob-array? "A subset of elements that are
724 relevant for finding the @code{pure-Y-extent}.")
726 (rest ,ly:grob? "A pointer to a @code{Rest} object.")
727 (rest-collision ,ly:grob? "A rest collision that a rest is in.")
728 (rests ,ly:grob-array? "A list of rest objects.")
729 (right-items ,ly:grob-array? "DOCME")
730 (right-neighbors ,ly:grob-array? "See @code{left-neighbors}.")
732 (separation-item ,ly:grob? "A separation item.")
733 (side-support-elements ,ly:grob-array? "The side support, a list of
735 (slur ,ly:grob? "A pointer to a @code{Slur} object.")
736 (spaceable-staves ,ly:grob-array? "Objects to be spaced during page
738 (spacing ,ly:grob? "The spacing spanner governing this section.")
739 (spacing-wishes ,ly:grob-array? "List of note spacing or staff spacing
741 (staff-symbol ,ly:grob? "The staff symbol grob that we are in.")
742 (stem ,ly:grob? "A pointer to a @code{Stem} object.")
743 (stems ,ly:grob-array? "A list of stem objects, corresponding to the
744 notes that the arpeggio has to be before.")
746 (tie ,ly:grob? "A pointer to a @code{Tie} object.")
747 (tremolo-flag ,ly:grob? "The tremolo object on a stem.")
748 (tuplet-number ,ly:grob? "The number for a bracket.")
749 (tuplets ,ly:grob-array? "A list of smaller tuplet brackets.")
753 (begin-of-line-visible ,boolean? "Used for marking @code{ChordNames}
754 that should only show changes.")
756 (cause ,scheme? "Any kind of causation objects (i.e., music, or perhaps
757 translator) that was the cause for this grob.")
758 (circled-tip ,boolean? "Put a circle at start/end of hairpins (al/del
761 (delta-position ,number? "The vertical position difference.")
762 (details ,list? "Alist of parameters for detailed grob behavior.
764 More information on the allowed parameters can be found by inspecting
765 @file{lily/slur-scoring.cc}, @file{lily/beam-quanting.cc}, and
766 @file{lily/tie-formatting-problem.cc}. Setting @code{debug-tie-scoring},
767 @code{debug-beam-scoring} or @code{debug-slur-scoring} also provides
770 (font ,ly:font-metric? "A cached font metric object.")
772 (head-width ,ly:dimension? "The width of this ligature head.")
774 (ideal-distances ,list? "@code{(@var{obj} . (@var{dist} .
775 @var{strength}))} pairs.")
776 (interfaces ,list? "A list of symbols indicating the interfaces
777 supported by this object. It is initialized from the @code{meta} field.")
779 (least-squares-dy ,number? "The ideal beam slope, without damping.")
781 (meta ,list? "Provide meta information. It is an alist with the
782 entries @code{name} and @code{interfaces}.")
783 (minimum-distances ,list? "A list of rods that have the format
784 @code{(@var{obj} . @var{dist})}.")
786 (positioning-done ,boolean? "Used to signal that a positioning element
787 did its job. This ensures that a positioning is only done once.")
788 (pure-Y-extent ,number-pair? "The estimated height of a system.")
790 (quant-score ,string? "The beam quanting score; stored for
792 (quantize-position ,boolean? "If set, a vertical alignment is aligned
793 to be within staff spaces.")
794 (quantized-positions ,number-pair? "The beam positions after
797 (script-stencil ,pair? "A pair @code{(@var{type} . @var{arg})} which
798 acts as an index for looking up a @code{Stencil} object.")
799 (shorten ,ly:dimension? "The amount of space that a stem is shortened.
800 Internally used to distribute beam shortening over stems.")
801 (skyline-distance ,number? "The distance between this staff and the
802 next one, as determined by a skyline algorithm.")
803 (skyline-horizontal-padding ,number? "For determining the vertical
804 distance between two staves, it is possible to have a configuration which
805 would result in a tight interleaving of grobs from the top staff and the
806 bottom staff. The larger this parameter is, the farther apart the staves
807 are placed in such a configuration.")
808 (stem-info ,pair? "A cache of stem parameters.")
810 (use-breve-rest ,boolean? "Use breve rests for measures longer
817 ;; There are too many properties for ancient notation;
818 ;; probably neume-types (a list of symbols) would also work.
820 ;; However, such a list would consist of a couple of dozens of
821 ;; entries, since head prefixes may be combined in many ways. If
822 ;; the macros in `gregorian-init.ly' would directly set prefix-set,
823 ;; all the head prefixes could be junked; however, such macros
824 ;; would be quite numerous, I guess. --jr
826 (add-cauda ,boolean? "Does this flexa require an additional cauda on
828 (add-join ,boolean? "Is this ligature head-joined with the next one
829 by a vertical line?")
830 (add-stem ,boolean? "Is this ligature head a virga and therefore needs
831 an additional stem on the right side?")
832 (ascendens ,boolean? "Is this neume of ascending type?")
833 (auctum ,boolean? "Is this neume liquescentically augmented?")
835 (cavum ,boolean? "Is this neume outlined?")
836 (context-info ,integer? "Within a ligature, the final glyph or shape of
837 a head may be affected by the left and/or right neighbour head.
838 @code{context-info} holds for each head such information about the left and
839 right neighbour, encoded as a bit mask.")
841 (descendens ,boolean? "Is this neume of descendent type?")
842 (deminutum ,boolean? "Is this neume deminished?")
844 (flexa-height ,ly:dimension? "The height of a flexa shape in a ligature
845 grob (in @code{staff-space} units).")
846 (flexa-width ,ly:dimension? "The width of a flexa shape in a
847 ligature grob in (in @code{staff-space} units).")
849 (inclinatum ,boolean? "Is this neume an inclinatum?")
851 (join-heads ,boolean? "Whether to join the note heads of an ambitus
852 grob with a vertical line.")
853 (join-right-amount ,number? "DOCME")
855 (linea ,boolean? "Attach vertical lines to this neume?")
857 (oriscus ,boolean? "Is this neume an oriscus?")
859 (pes-or-flexa ,boolean? "Shall this neume be joined with the previous
861 (prefix-set ,number? "A bit mask that holds all Gregorian head
862 prefixes, such as @code{\\virga} or @code{\\quilisma}.")
863 (primitive ,integer? "A pointer to a ligature primitive, i.e., an item
864 similar to a note head that is part of a ligature.")
866 (quilisma ,boolean? "Is this neume a quilisma?")
868 (stropha ,boolean? "Is this neume a stropha?")
870 (virga ,boolean? "Is this neume a virga?")
872 (x-offset ,ly:dimension? "Extra horizontal offset for ligature heads.")
876 (define-public all-backend-properties
878 all-internal-grob-properties
879 all-user-grob-properties))