jack
69753e35f9
- Implement synchronous offscreen wafer map PNG rendering and CSV summary. - Add "Batch Export" button to file browser sidebar. - Adjust trend pane bottom spacer to align with About button when visible. - Fix type check errors and add pytest coverage for batch export.
53 lines
1.8 KiB
Python
53 lines
1.8 KiB
Python
"""Pure coordinate-mapping math shared by the QQuickPaintedItem chart items
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(GraphQuickItem, TrendChartItem). No QPainter or Qt-widget dependency, so
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it's testable without a GUI — unlike the paint() methods that call it.
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"""
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from __future__ import annotations
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def value_to_pixel(
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value: float,
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value_min: float,
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value_max: float,
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pixel_start: float,
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pixel_span: float,
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) -> float:
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"""Map a value onto a pixel range, inverted so larger values sit at
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smaller pixel coordinates (screen y grows downward).
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Also used for evenly-spaced tick indices: pass the tick index as
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`value` and `(tick_count - 1)` as `value_max` with `value_min=0`.
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"""
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value_range = value_max - value_min
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if value_range < 1e-9:
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return pixel_start + pixel_span / 2
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fraction = 1.0 - (value - value_min) / value_range
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return pixel_start + fraction * pixel_span
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def index_to_pixel(index: float, count: int, pixel_start: float, pixel_span: float) -> float:
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"""Map a 0-based sample index onto a pixel range, left to right."""
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if count <= 1:
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return pixel_start + pixel_span / 2
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fraction = index / (count - 1)
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return pixel_start + fraction * pixel_span
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def elapsed_to_pixel(
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elapsed: float,
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window_start: float,
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window_end: float,
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pixel_start: float,
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pixel_span: float,
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) -> float:
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"""Map an elapsed-seconds value onto a pixel range, left to right.
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Unlike `value_to_pixel`, this is not inverted: larger elapsed values sit
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at larger pixel x-coordinates, matching how time flows left-to-right.
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"""
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window_span = window_end - window_start
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if window_span < 1e-9:
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return pixel_start + pixel_span
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fraction = (elapsed - window_start) / window_span
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return pixel_start + fraction * pixel_span
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