New in version 1.1.
Yield left-to-right components in the thread of component starting from component.
When klass = None return all components in the thread of component.
When klass is set to some other Abjad class, yield only klass instances in the thread of component:
abjad> from abjad.tools import threadtools
abjad> container = Container(Voice(notetools.make_repeated_notes(2)) * 2)
abjad> container.is_parallel = True
abjad> container[0].name = 'voice 1'
abjad> container[1].name = 'voice 2'
abjad> staff = Staff(container * 2)
abjad> pitchtools.set_ascending_named_diatonic_pitches_on_nontied_pitched_components_in_expr(staff)
abjad> print staff.format
\new Staff {
<<
\context Voice = "voice 1" {
c'8
d'8
}
\context Voice = "voice 2" {
e'8
f'8
}
>>
<<
\context Voice = "voice 1" {
g'8
a'8
}
\context Voice = "voice 2" {
b'8
c''8
}
>>
}
Starting from the first leaf in score.
abjad> for x in threadtools.iterate_thread_forward_from_component(staff.leaves[0], Note):
... x
...
Note("c'8")
Note("d'8")
Note("g'8")
Note("a'8")
Starting from the second leaf in score.
abjad> for x in threadtools.iterate_thread_forward_from_component(staff.leaves[1], Note):
... x
...
Note("d'8")
Note("g'8")
Note("a'8")
Yield all components in thread.
abjad> for x in threadtools.iterate_thread_forward_from_component(staff.leaves[0]):
... x
...
Note("c'8")
Voice-"voice 1"{2}
Note("d'8")
Voice-"voice 1"{2}
Note("g'8")
Note("a'8")
Note that this function is a special type of depth-first search.
Compare with threadtools.iterate_thread_forward_in_expr().
Changed in version 2.0: renamed iterate.thread_forward_from() to threadtools.iterate_thread_forward_from_component().
Changed in version 2.0: renamed iterate.thread_forward_from_component() to threadtools.iterate_thread_forward_from_component().