khodowany
53 lines
1.7 KiB
Python
53 lines
1.7 KiB
Python
"""Four-fret hand windows shared by chord and single-note placement.
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This describes playable regions, not an anatomical fingering solver. Chord
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and single tones may occupy any frets within the window. Only shifting the
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window is movement. Actual sounded-note limits remain in fretboard.py.
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"""
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import functools
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import typing
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import generator.fretboard
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VERSION = 'hand-window-2'
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class Motion(typing.NamedTuple):
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shift: int = 0
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fingers: int = 0
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strings: int = 0
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@property
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def ergonomics(self):
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return self.fingers + self.strings
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def base(shape):
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return min((p.fret for p in shape), default=0)
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@functools.lru_cache(maxsize=4096)
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def regions(shape):
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if not shape:
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return tuple([0])
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return tuple(range(max(1, max(p.fret for p in shape) - 3), min(base(shape), generator.fretboard.MAX_ANCHOR_FRET) + 1))
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@functools.lru_cache(maxsize=32768)
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def motion(previous, current, old_hand, hand, acoustic=False):
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if not previous or not current:
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return Motion()
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if len(previous) == len(current) == 1:
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pairs = ((previous[0], current[0]),)
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unmatched = 0
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else:
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def voices(shape):
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return {('bass' if acoustic and p.string_number in (5, 6) else p.string_number): p for p in shape}
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a, b = voices(previous), voices(current)
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pairs = tuple((a[s], b[s]) for s in a.keys() & b.keys())
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unmatched = len(a.keys() ^ b.keys())
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return Motion(abs(hand - old_hand),
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unmatched + sum(abs((a.fret - old_hand) - (b.fret - hand)) for a, b in pairs),
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sum(abs(a.string_number - b.string_number) for a, b in pairs))
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def summary(shifts):
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shifts = tuple(shifts)
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return {'total_travel': sum(shifts), 'shift_count': sum(s > 0 for s in shifts), 'largest_shift': max(shifts, default=0)}
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