travandClaude Fable 5
407c5669c5
TapTempo kept a rolling window of 8 taps, so a long tapping session chased the most recent taps instead of converging on the overall tempo (trav noticed the estimate never settled). Every tap since the session started now counts; a >2.5s gap still begins a fresh session. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
35 lines
1.1 KiB
Python
35 lines
1.1 KiB
Python
"""Tap-tempo math, kept Qt-free so it's unit-testable."""
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class TapTempo:
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RESET_GAP_SECONDS = 2.5
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def __init__(self):
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self._taps: list[float] = []
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def tap(self, now: float) -> int | None:
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"""Record a tap at monotonic time `now`; returns the current bpm
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estimate (None until there are two taps in the series). Every tap
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since the series started counts — the estimate converges on the
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overall tempo instead of chasing the most recent few taps."""
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if self._taps and now - self._taps[-1] > self.RESET_GAP_SECONDS:
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self._taps = []
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self._taps.append(now)
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return self.bpm()
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def bpm(self) -> int | None:
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if len(self._taps) < 2:
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return None
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intervals = [b - a for a, b in zip(self._taps, self._taps[1:])]
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average = sum(intervals) / len(intervals)
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if average <= 0:
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return None
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return round(60.0 / average)
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@property
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def tap_count(self) -> int:
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return len(self._taps)
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def reset(self):
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self._taps = []
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