12 BREAK_PRE,BREAK_MIDDLE, BREAK_POST, BREAK_END
14 /// set a nonrythmical symbol
19 /// analogous to argv[]
28 A nonrhythmical "thing" in a staff is called a "command".
29 Commands have these properties:
32 \item They are \bf{not} rhythmical, i.e. they do not have a duration
33 \item They have a staff-wide impact, i.e. a command cannot be targeted at
34 only one voice in the staff: two voices sharing a staff can't have
36 \item Commands are ordered, that is, when from musical point of view the
37 commands happen simultaneously, the order in which Staff receives the
38 commands can still make a difference in the output
39 \item Some commands are actually score wide, so Score has to issue these
40 commands to the Staff, eg. BREAK commands
43 At this moment we have three classes of commands:
45 INTERPRET commands are not grouped.
46 \item[TYPESET] These commands instruct the Staff to
47 typeset symbols on the output, eg meter/clef/key changes
48 \item[INTERPRET] These commands do not produce output, instead,
49 they change the interpretation of other commands or requests.
50 example: shift output vertically, set the key.
51 \item[BREAK_XXX] These commands group TYPESET commands in
52 prebreak and postbreak commands. \See{Col}.
53 Staff can insert additional commands in a sequence of BREAK_XXX
54 commands, eg. key change commands
58 These commands are generated by Score, since they have to be the
59 same for the whole score.
67 \item[TYPESET] METER,BAR
71 Commands can be freely copied, they do not have virtual methods.