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Delta Between Two Patch Sets: Documentation/learning/tweaks.itely

Issue 1056041: Doc: LM: Reformat ly code. (Closed)
Left Patch Set: Make requested changes. Created 13 years, 11 months ago
Right Patch Set: Make requested changes. Created 13 years, 10 months ago
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LEFTRIGHT
1 @c -*- coding: utf-8; mode: texinfo; -*- 1 @c -*- coding: utf-8; mode: texinfo; -*-
2 2
3 @ignore 3 @ignore
4 Translation of GIT committish: FILL-IN-HEAD-COMMITTISH 4 Translation of GIT committish: FILL-IN-HEAD-COMMITTISH
5 5
6 When revising a translation, copy the HEAD committish of the 6 When revising a translation, copy the HEAD committish of the
7 version that you are working on. For details, see the Contributors' 7 version that you are working on. For details, see the Contributors'
8 Guide, node Updating translation committishes.. 8 Guide, node Updating translation committishes..
9 @end ignore 9 @end ignore
10 10
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378 \tweak #'@var{layout-property} #@var{value} 378 \tweak #'@var{layout-property} #@var{value}
379 @end example 379 @end example
380 380
381 A @code{\tweak} command can also be used to modify just one in 381 A @code{\tweak} command can also be used to modify just one in
382 a series of articulations, as shown here: 382 a series of articulations, as shown here:
383 383
384 @cindex color property, example 384 @cindex color property, example
385 @cindex @code{\tweak}, example 385 @cindex @code{\tweak}, example
386 386
387 @lilypond[quote,fragment,ragged-right,verbatim,relative=2] 387 @lilypond[quote,fragment,ragged-right,verbatim,relative=2]
388 a4^Black 388 a4^"Black"
389 -\tweak #'color #red ^Red 389 -\tweak #'color #red ^"Red"
390 -\tweak #'color #green _Green 390 -\tweak #'color #green _"Green"
391 @end lilypond 391 @end lilypond
392 392
393 @noindent 393 @noindent
394 Note that the @code{\tweak} command must be preceded by an 394 Note that the @code{\tweak} command must be preceded by an
395 articulation mark as if it were an articulation itself. 395 articulation mark as if it were an articulation itself.
396 396
397 @cindex tuplets, nested 397 @cindex tuplets, nested
398 @cindex triplets, nested 398 @cindex triplets, nested
399 @cindex bracket, tuplet 399 @cindex bracket, tuplet
400 @cindex bracket, triplet 400 @cindex bracket, triplet
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418 @cindex direction property, example 418 @cindex direction property, example
419 @cindex color property, example 419 @cindex color property, example
420 420
421 @lilypond[quote,ragged-right,verbatim,fragment,relative=2] 421 @lilypond[quote,ragged-right,verbatim,fragment,relative=2]
422 \tweak #'direction #up 422 \tweak #'direction #up
423 \times 4/3 { 423 \times 4/3 {
424 \tweak #'color #red 424 \tweak #'color #red
425 \times 2/3 { c8[ c c] } 425 \times 2/3 { c8[ c c] }
426 \times 2/3 { c8[ c c] } 426 \times 2/3 { c8[ c c] }
427 \times 2/3 { c8[ c c] } 427 \times 2/3 { c8[ c c] }
428 } | 428 }
429 @end lilypond 429 @end lilypond
430 430
431 If nested tuplets do not begin at the same moment, their 431 If nested tuplets do not begin at the same moment, their
432 appearance may be modified in the usual way with 432 appearance may be modified in the usual way with
433 @code{\override} commands: 433 @code{\override} commands:
434 434
435 @cindex text property, example 435 @cindex text property, example
436 @cindex tuplet-number function, example 436 @cindex tuplet-number function, example
437 @cindex transparent property, example 437 @cindex transparent property, example
438 @cindex TupletNumber, example of overriding 438 @cindex TupletNumber, example of overriding
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1067 correct processing. For example, errors will be generated if the 1067 correct processing. For example, errors will be generated if the
1068 @code{stencil} property of the @code{NoteHead} object is set to 1068 @code{stencil} property of the @code{NoteHead} object is set to
1069 @code{#f}. If this is the case, you can instead use the 1069 @code{#f}. If this is the case, you can instead use the
1070 @code{point-stencil} function, which sets the stencil to a object 1070 @code{point-stencil} function, which sets the stencil to a object
1071 with zero size: 1071 with zero size:
1072 1072
1073 @lilypond[quote,verbatim,relative=2] 1073 @lilypond[quote,verbatim,relative=2]
1074 { 1074 {
1075 c4 c 1075 c4 c
1076 \once \override NoteHead #'stencil = #point-stencil 1076 \once \override NoteHead #'stencil = #point-stencil
1077 c4 c | 1077 c4 c
1078 } 1078 }
1079 @end lilypond 1079 @end lilypond
1080 1080
1081 @subheading break-visibility 1081 @subheading break-visibility
1082 1082
1083 @cindex break-visibility property 1083 @cindex break-visibility property
1084 1084
1085 We see from the @code{BarLine} properties in the IR that the 1085 We see from the @code{BarLine} properties in the IR that the
1086 @code{break-visibility} property requires a vector of three booleans. 1086 @code{break-visibility} property requires a vector of three booleans.
1087 These control respectively whether bar lines are printed at the end of 1087 These control respectively whether bar lines are printed at the end of
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1640 placed closer to the staff. 1640 placed closer to the staff.
1641 1641
1642 In the following example all the markup texts have the same 1642 In the following example all the markup texts have the same
1643 priority (since it is not explicitly set). Note that @q{Text3} 1643 priority (since it is not explicitly set). Note that @q{Text3}
1644 is automatically positioned close to the staff again, nestling 1644 is automatically positioned close to the staff again, nestling
1645 under @q{Text2}. 1645 under @q{Text2}.
1646 1646
1647 @cindex markup example 1647 @cindex markup example
1648 1648
1649 @lilypond[quote,fragment,ragged-right,verbatim,relative=2] 1649 @lilypond[quote,fragment,ragged-right,verbatim,relative=2]
1650 c2^"Text1" c^"Text2" | 1650 c2^"Text1"
1651 c2^"Text3" c^"Text4" | 1651 c2^"Text2" |
1652 c2^"Text3"
1653 c2^"Text4" |
1652 @end lilypond 1654 @end lilypond
1653 1655
1654 Staves are also positioned, by default, as closely together as 1656 Staves are also positioned, by default, as closely together as
1655 possible (subject to a minimum separation). If notes project 1657 possible (subject to a minimum separation). If notes project
1656 a long way towards an adjacent staff they will force the 1658 a long way towards an adjacent staff they will force the
1657 staves further apart only if an overlap of the notation 1659 staves further apart only if an overlap of the notation
1658 would otherwise occur. The following example demonstrates 1660 would otherwise occur. The following example demonstrates
1659 this @q{nestling} of the notes on adjacent staves: 1661 this @q{nestling} of the notes on adjacent staves:
1660 1662
1661 @lilypond[quote,ragged-right,verbatim] 1663 @lilypond[quote,ragged-right,verbatim]
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2119 like @qq{Text3} to be placed above @qq{Text4} in the example 2121 like @qq{Text3} to be placed above @qq{Text4} in the example
2120 under Automatic behavior, above (see @ref{Automatic behavior}). 2122 under Automatic behavior, above (see @ref{Automatic behavior}).
2121 All we need to do is to look up the priority of @code{TextScript} 2123 All we need to do is to look up the priority of @code{TextScript}
2122 in the IR or in the tables above, and increase the priority of 2124 in the IR or in the tables above, and increase the priority of
2123 @qq{Text3} to a higher value: 2125 @qq{Text3} to a higher value:
2124 2126
2125 @cindex TextScript, example of overriding 2127 @cindex TextScript, example of overriding
2126 @cindex outside-staff-priority property, example 2128 @cindex outside-staff-priority property, example
2127 2129
2128 @lilypond[quote,fragment,ragged-right,verbatim,relative=2] 2130 @lilypond[quote,fragment,ragged-right,verbatim,relative=2]
2129 c2^"Text1" c^"Text2" | 2131 c2^"Text1"
2132 c2^"Text2" |
2130 \once \override TextScript #'outside-staff-priority = #500 2133 \once \override TextScript #'outside-staff-priority = #500
2131 c2^"Text3" c^"Text4" | 2134 c2^"Text3"
2135 c2^"Text4" |
2132 @end lilypond 2136 @end lilypond
2133 2137
2134 This certainly lifts @qq{Text3} above @qq{Text4} but it also lifts it 2138 This certainly lifts @qq{Text3} above @qq{Text4} but it also lifts it
2135 above @qq{Text2}, and @qq{Text4} now drops down. Perhaps this is not 2139 above @qq{Text2}, and @qq{Text4} now drops down. Perhaps this is not
2136 so good. What we would really like to do is to position all the 2140 so good. What we would really like to do is to position all the
2137 annotation at the same distance above the staff. To do this, we 2141 annotation at the same distance above the staff. To do this, we
2138 clearly will need to space the notes out horizontally to make more 2142 clearly will need to space the notes out horizontally to make more
2139 room for the text. This is done using the @code{textLengthOn} 2143 room for the text. This is done using the @code{textLengthOn}
2140 command. 2144 command.
2141 2145
2142 @subheading \textLengthOn 2146 @subheading \textLengthOn
2143 2147
2144 @cindex notes, spreading out with text 2148 @cindex notes, spreading out with text
2145 2149
2146 @funindex \textLengthOn 2150 @funindex \textLengthOn
2147 @funindex textLengthOn 2151 @funindex textLengthOn
2148 @funindex \textLengthOff 2152 @funindex \textLengthOff
2149 @funindex textLengthOff 2153 @funindex textLengthOff
2150 2154
2151 By default, text produced by markup takes up no horizontal space 2155 By default, text produced by markup takes up no horizontal space
2152 as far as laying out the music is concerned. The @code{\textLengthOn} 2156 as far as laying out the music is concerned. The @code{\textLengthOn}
2153 command reverses this behavior, causing the notes to be spaced 2157 command reverses this behavior, causing the notes to be spaced
2154 out as far as is necessary to accommodate the text: 2158 out as far as is necessary to accommodate the text:
2155 2159
2156 @lilypond[quote,fragment,ragged-right,verbatim,relative=2] 2160 @lilypond[quote,fragment,ragged-right,verbatim,relative=2]
2157 \textLengthOn % Cause notes to space out to accommodate text 2161 \textLengthOn % Cause notes to space out to accommodate text
2158 c2^"Text1" c^"Text2" | 2162 c2^"Text1"
2159 c2^"Text3" c^"Text4" | 2163 c2^"Text2" |
2164 c2^"Text3"
2165 c2^"Text4" |
2160 @end lilypond 2166 @end lilypond
2161 2167
2162 The command to revert to the default behavior is 2168 The command to revert to the default behavior is
2163 @code{\textLengthOff}. Remember @code{\once} only works with 2169 @code{\textLengthOff}. Remember @code{\once} only works with
2164 @code{\override}, @code{\set}, @code{\revert} or @code{unset}, 2170 @code{\override}, @code{\set}, @code{\revert} or @code{unset},
2165 so cannot be used with @code{\textLengthOn}. 2171 so cannot be used with @code{\textLengthOn}.
2166 2172
2167 @cindex markup text, allowing collisions 2173 @cindex markup text, allowing collisions
2168 2174
2169 Markup text will also avoid notes which project above the staff. 2175 Markup text will also avoid notes which project above the staff.
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2293 lines, so moving the left edge half a unit to the left and the 2299 lines, so moving the left edge half a unit to the left and the
2294 right edge half a unit to the right should do it: 2300 right edge half a unit to the right should do it:
2295 2301
2296 @cindex DynamicText, example of overriding 2302 @cindex DynamicText, example of overriding
2297 @cindex extra-spacing-width property, example 2303 @cindex extra-spacing-width property, example
2298 2304
2299 @lilypond[quote,fragment,ragged-right,verbatim,relative=2] 2305 @lilypond[quote,fragment,ragged-right,verbatim,relative=2]
2300 \dynamicUp 2306 \dynamicUp
2301 % Extend width by 1 staff space 2307 % Extend width by 1 staff space
2302 \override DynamicText #'extra-spacing-width = #'(-0.5 . 0.5) 2308 \override DynamicText #'extra-spacing-width = #'(-0.5 . 0.5)
2303 a4\f b\mf c\mp b\p | 2309 a4\f b\mf c\mp b\p
2304 @end lilypond 2310 @end lilypond
2305 2311
2306 @noindent 2312 @noindent
2307 This looks better, but maybe we would prefer the dynamic marks 2313 This looks better, but maybe we would prefer the dynamic marks
2308 to be aligned along the same baseline rather than going up and 2314 to be aligned along the same baseline rather than going up and
2309 down with the notes. The property to do this is 2315 down with the notes. The property to do this is
2310 @code{staff-padding} which is covered in the following section. 2316 @code{staff-padding} which is covered in the following section.
2311 2317
2312 2318
2313 @node Collisions of objects 2319 @node Collisions of objects
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2567 The @code{padding} property can be set to increase 2573 The @code{padding} property can be set to increase
2568 (or decrease) the distance between symbols that are printed 2574 (or decrease) the distance between symbols that are printed
2569 above or below notes. 2575 above or below notes.
2570 2576
2571 @cindex Script, example of overriding 2577 @cindex Script, example of overriding
2572 @cindex padding property, example 2578 @cindex padding property, example
2573 2579
2574 @lilypond[quote,fragment,relative=1,verbatim] 2580 @lilypond[quote,fragment,relative=1,verbatim]
2575 c2\fermata 2581 c2\fermata
2576 \override Script #'padding = #3 2582 \override Script #'padding = #3
2577 b2\fermata | 2583 b2\fermata
2578 @end lilypond 2584 @end lilypond
2579 2585
2580 @cindex MetronomeMark, example of overriding 2586 @cindex MetronomeMark, example of overriding
2581 @cindex padding property, example 2587 @cindex padding property, example
2582 2588
2583 @lilypond[quote,fragment,relative=1,verbatim] 2589 @lilypond[quote,fragment,relative=1,verbatim]
2584 % This will not work, see below 2590 % This will not work, see below
2585 \override MetronomeMark #'padding = #3 2591 \override MetronomeMark #'padding = #3
2586 \tempo 4=120 2592 \tempo 4=120
2587 c1 | 2593 c1 |
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2667 @cindex extra-spacing-width property, example 2673 @cindex extra-spacing-width property, example
2668 @cindex DynamicLineSpanner, example of overriding 2674 @cindex DynamicLineSpanner, example of overriding
2669 @cindex staff-padding property, example 2675 @cindex staff-padding property, example
2670 2676
2671 @lilypond[quote,fragment,ragged-right,verbatim,relative=2] 2677 @lilypond[quote,fragment,ragged-right,verbatim,relative=2]
2672 \dynamicUp 2678 \dynamicUp
2673 % Extend width by 1 unit 2679 % Extend width by 1 unit
2674 \override DynamicText #'extra-spacing-width = #'(-0.5 . 0.5) 2680 \override DynamicText #'extra-spacing-width = #'(-0.5 . 0.5)
2675 % Align dynamics to a base line 2 units above staff 2681 % Align dynamics to a base line 2 units above staff
2676 \override DynamicLineSpanner #'staff-padding = #2 2682 \override DynamicLineSpanner #'staff-padding = #2
2677 a4\f b\mf c\mp b\p | 2683 a4\f b\mf c\mp b\p
2678 @end lilypond 2684 @end lilypond
2679 2685
2680 2686
2681 @subheading self-alignment-X property 2687 @subheading self-alignment-X property
2682 2688
2683 The following example shows how this can resolve the collision 2689 The following example shows how this can resolve the collision
2684 of a string fingering object with a note's stem by aligning the 2690 of a string fingering object with a note's stem by aligning the
2685 right edge with the reference point of the parent note: 2691 right edge with the reference point of the parent note:
2686 2692
2687 @cindex StringNumber, example of overriding 2693 @cindex StringNumber, example of overriding
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2718 2724
2719 @cindex MultiMeasureRest, example of overriding 2725 @cindex MultiMeasureRest, example of overriding
2720 @cindex staff-position property, example 2726 @cindex staff-position property, example
2721 2727
2722 @lilypond[quote,verbatim,fragment,ragged-right, relative=1] 2728 @lilypond[quote,verbatim,fragment,ragged-right, relative=1]
2723 << 2729 <<
2724 { c4 c c c } 2730 { c4 c c c }
2725 \\ 2731 \\
2726 \override MultiMeasureRest #'staff-position = #-8 2732 \override MultiMeasureRest #'staff-position = #-8
2727 { R1 } 2733 { R1 }
2728 >> | 2734 >>
2729 @end lilypond 2735 @end lilypond
2730 2736
2731 This is better than using, for example, @code{extra-offset}, 2737 This is better than using, for example, @code{extra-offset},
2732 because the ledger line above the rest is inserted automatically. 2738 because the ledger line above the rest is inserted automatically.
2733 2739
2734 @subheading extra-offset property 2740 @subheading extra-offset property
2735 2741
2736 @cindex positioning objects 2742 @cindex positioning objects
2737 @cindex positioning grobs 2743 @cindex positioning grobs
2738 @cindex objects, positioning 2744 @cindex objects, positioning
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2763 @cindex slurs, controlling manually 2769 @cindex slurs, controlling manually
2764 @cindex phrasing slurs, controlling manually 2770 @cindex phrasing slurs, controlling manually
2765 @cindex beams, controlling manually 2771 @cindex beams, controlling manually
2766 2772
2767 The @code{positions} property allows the position and slope of 2773 The @code{positions} property allows the position and slope of
2768 tuplets, slurs, phrasing slurs and beams to be controlled manually. 2774 tuplets, slurs, phrasing slurs and beams to be controlled manually.
2769 Here's an example which has an ugly phrasing slur due to its trying to 2775 Here's an example which has an ugly phrasing slur due to its trying to
2770 avoid the slur on the acciaccatura. 2776 avoid the slur on the acciaccatura.
2771 2777
2772 @lilypond[quote,verbatim,fragment,ragged-right,relative=1] 2778 @lilypond[quote,verbatim,fragment,ragged-right,relative=1]
2773 r4 \acciaccatura e8\( d8 c~ c d c d\) | 2779 r4 \acciaccatura e8\( d8 c~ c d c d\)
2774 @end lilypond 2780 @end lilypond
2775 2781
2776 @noindent 2782 @noindent
2777 We could simply move the phrasing slur above the notes, and this 2783 We could simply move the phrasing slur above the notes, and this
2778 would be the preferred solution: 2784 would be the preferred solution:
2779 2785
2780 @lilypond[quote,verbatim,fragment,ragged-right,relative=1] 2786 @lilypond[quote,verbatim,fragment,ragged-right,relative=1]
2781 r4 2787 r4
2782 \phrasingSlurUp 2788 \phrasingSlurUp
2783 \acciaccatura e8\( d8 c~ c d c d\) | 2789 \acciaccatura e8\( d8 c~ c d c d\)
2784 @end lilypond 2790 @end lilypond
2785 2791
2786 @noindent 2792 @noindent
2787 But if there were some reason why this could not be done the 2793 But if there were some reason why this could not be done the
2788 other alternative would be to move the left end of the phrasing 2794 other alternative would be to move the left end of the phrasing
2789 slur down a little using the @code{positions} property. This 2795 slur down a little using the @code{positions} property. This
2790 also resolves the rather nasty shape. 2796 also resolves the rather nasty shape.
2791 2797
2792 @cindex PhrasingSlur, example of overriding 2798 @cindex PhrasingSlur, example of overriding
2793 @cindex positions property, example 2799 @cindex positions property, example
2794 2800
2795 @lilypond[quote,verbatim,fragment,ragged-right,relative=1] 2801 @lilypond[quote,verbatim,fragment,ragged-right,relative=1]
2796 r4 2802 r4
2797 \once \override PhrasingSlur #'positions = #'(-4 . -3) 2803 \once \override PhrasingSlur #'positions = #'(-4 . -3)
2798 \acciaccatura e8\( d8 c~ c d c d\) | 2804 \acciaccatura e8\( d8 c~ c d c d\)
2799 @end lilypond 2805 @end lilypond
2800 2806
2801 Here's a further example taken from the opening of the left-hand 2807 Here's a further example taken from the opening of the left-hand
2802 staff of Chopin's Prelude Op 28 No. 2. We see that the beam 2808 staff of Chopin's Prelude Op 28 No. 2. We see that the beam
2803 collides with the upper notes: 2809 collides with the upper notes:
2804 2810
2805 @lilypond[quote,verbatim,fragment,ragged-right] 2811 @lilypond[quote,verbatim,fragment,ragged-right]
2806 { 2812 {
2807 \clef bass 2813 \clef bass
2808 << { b,8 ais, b, g, } \\ { e,8 g e, g } >> 2814 << { b,8 ais, b, g, } \\ { e,8 g e, g } >>
2809 << { b,8 ais, b, g, } \\ { e,8 g e, g } >> | 2815 << { b,8 ais, b, g, } \\ { e,8 g e, g } >>
2810 } 2816 }
2811 @end lilypond 2817 @end lilypond
2812 2818
2813 @noindent 2819 @noindent
2814 This can be resolved by manually moving both ends of the beam 2820 This can be resolved by manually moving both ends of the beam
2815 up from their position at 2 staff-spaces above the center line to, 2821 up from their position at 2 staff-spaces above the center line to,
2816 say, 3: 2822 say, 3:
2817 2823
2818 @cindex Beam, example of overriding 2824 @cindex Beam, example of overriding
2819 @cindex positions property, example 2825 @cindex positions property, example
2820 2826
2821 @lilypond[quote,verbatim,fragment,ragged-right] 2827 @lilypond[quote,verbatim,fragment,ragged-right]
2822 { 2828 {
2823 \clef bass 2829 \clef bass
2824 << 2830 <<
2825 \override Beam #'positions = #'(3 . 3) 2831 \override Beam #'positions = #'(3 . 3)
2826 { b,8 ais, b, g, } 2832 { b,8 ais, b, g, }
2827 \\ 2833 \\
2828 { e,8 g e, g } 2834 { e,8 g e, g }
2829 >> 2835 >>
2830 << { b,8 ais, b, g, } \\ { e,8 g e, g } >> | 2836 << { b,8 ais, b, g, } \\ { e,8 g e, g } >>
2831 } 2837 }
2832 @end lilypond 2838 @end lilypond
2833 2839
2834 @noindent 2840 @noindent
2835 Note that the override continues to apply in the first voice of 2841 Note that the override continues to apply in the first voice of
2836 the second block of quavers, but not to any of the beams in the 2842 the second block of quavers, but not to any of the beams in the
2837 second voice. 2843 second voice.
2838 2844
2839 @subheading force-hshift property 2845 @subheading force-hshift property
2840 2846
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4096 @cindex NoteHead, example of overriding 4102 @cindex NoteHead, example of overriding
4097 @cindex color property, setting to Scheme procedure 4103 @cindex color property, setting to Scheme procedure
4098 4104
4099 @lilypond[quote,verbatim,ragged-right] 4105 @lilypond[quote,verbatim,ragged-right]
4100 #(define (color-notehead grob) 4106 #(define (color-notehead grob)
4101 "Color the notehead according to its position on the staff." 4107 "Color the notehead according to its position on the staff."
4102 (let ((mod-position (modulo (ly:grob-property grob 'staff-position) 4108 (let ((mod-position (modulo (ly:grob-property grob 'staff-position)
4103 7))) 4109 7)))
4104 (case mod-position 4110 (case mod-position
4105 ;; Return rainbow colors 4111 ;; Return rainbow colors
4106 ((1) (x11-color 'red )) ; for C 4112 ((1) (x11-color 'red )) ; for C
4107 ((2) (x11-color 'orange )) ; for D 4113 ((2) (x11-color 'orange )) ; for D
4108 ((3) (x11-color 'yellow )) ; for E 4114 ((3) (x11-color 'yellow )) ; for E
4109 ((4) (x11-color 'green )) ; for F 4115 ((4) (x11-color 'green )) ; for F
4110 ((5) (x11-color 'blue )) ; for G 4116 ((5) (x11-color 'blue )) ; for G
4111 ((6) (x11-color 'purple )) ; for A 4117 ((6) (x11-color 'purple )) ; for A
4112 ((0) (x11-color 'violet ))))) ; for B 4118 ((0) (x11-color 'violet )) ; for B
4119 )))
4113 4120
4114 \relative c' { 4121 \relative c' {
4115 % Arrange to obtain color from color-notehead procedure 4122 % Arrange to obtain color from color-notehead procedure
4116 \override NoteHead #'color = #color-notehead 4123 \override NoteHead #'color = #color-notehead
4117 a2 b | c2 d | e2 f | g2 a | 4124 a2 b | c2 d | e2 f | g2 a |
4118 } 4125 }
4119 @end lilypond 4126 @end lilypond
4120 4127
4121 Further examples showing the use of these programmable interfaces 4128 Further examples showing the use of these programmable interfaces
4122 can be found in @rextend{Callback functions}. 4129 can be found in @rextend{Callback functions}.
4123 4130
4124 4131
4125 4132
LEFTRIGHT

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