118 lines
4.0 KiB
Python
118 lines
4.0 KiB
Python
"""Renderer-independent processing contract. Numerical work stays in C99.
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Adapters publish immutable snapshots in the displayed units. Calculated curves
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are separate objects, never channels in the acquisition or measurement model.
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"""
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from __future__ import annotations
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import csv
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from dataclasses import dataclass
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from datetime import datetime, timezone
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from .signal_reconstruction import METHODS, reconstruct
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@dataclass(frozen=True)
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class Axis:
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label: str = "Время"
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unit: str = "мс"
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encoding: str = "numeric" # numeric or unix_ms; never infer from magnitude
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def __post_init__(self):
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if self.encoding not in ("numeric", "unix_ms"):
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raise ValueError("Неизвестное представление оси X")
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@dataclass(frozen=True)
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class Series:
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key: str
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label: str
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points: tuple
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visible: bool = True
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discrete: bool = False
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y_unit: str = ""
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def __post_init__(self):
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# A source may reuse mutable buffers immediately after publication.
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object.__setattr__(self, "points", tuple((float(x), float(y)) for x, y in self.points))
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@dataclass(frozen=True)
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class Snapshot:
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series: tuple = ()
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axis: Axis = Axis()
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source: str = ""
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x_range: tuple | None = None
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blocked_reason: str = ""
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def __post_init__(self):
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object.__setattr__(self, "series", tuple(self.series))
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if len({s.key for s in self.series}) != len(self.series):
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raise ValueError("Ключи каналов должны быть уникальны")
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if self.x_range is not None:
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left, right = self.x_range
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if not left <= right:
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raise ValueError("Неверные границы окна")
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object.__setattr__(self, "x_range", (left, right))
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@property
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def analogs(self):
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return tuple(s for s in self.series if s.visible and not s.discrete)
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@dataclass(frozen=True)
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class Request:
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series: Series
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axis: Axis
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source: str
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method: str
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output_count: int
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degree: int
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x_range: tuple | None
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@dataclass(frozen=True)
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class Curve:
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request: Request
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points: tuple
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input_count: int
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unique_count: int
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rmse: float
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@property
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def label(self):
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return f"{self.request.series.label} · расчёт ({METHODS[self.request.method]})"
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def prepare(snapshot, key, method="pchip", output_count=1000, degree=2):
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"""Return a comparable request, or None when the source is not processable."""
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if snapshot.blocked_reason:
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return None
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selected = next((s for s in snapshot.analogs if s.key == key), None)
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if selected is None:
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return None
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if snapshot.x_range is not None:
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left, right = snapshot.x_range
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selected = Series(selected.key, selected.label,
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tuple((x, y) for x, y in selected.points if left <= x <= right),
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y_unit=selected.y_unit)
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return Request(selected, snapshot.axis, snapshot.source, method, output_count, degree, snapshot.x_range)
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def process(request):
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if request is None:
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raise ValueError("Нет доступного аналогового канала")
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result = reconstruct(request.series.points, request.method, request.output_count, request.degree)
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return Curve(request, tuple(result.points), result.input_count, result.unique_count, result.rmse)
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def write_csv(curve, stream):
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"""CSV preserves the X domain. Relative time/frequency are numeric, not dates."""
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axis = curve.request.axis
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writer = csv.writer(stream)
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x_title = "timestamp" if axis.encoding == "unix_ms" else axis.label + (f" [{axis.unit}]" if axis.unit else "")
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y_title = curve.label + (f" [{curve.request.series.y_unit}]" if curve.request.series.y_unit else "")
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writer.writerow([x_title, y_title])
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for x, y in curve.points:
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value = (datetime.fromtimestamp(x / 1000, timezone.utc).isoformat(timespec="microseconds").replace("+00:00", "Z")
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if axis.encoding == "unix_ms" else x)
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writer.writerow([value, y])
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