82 lines
2.4 KiB
Python
82 lines
2.4 KiB
Python
# Copyright 2021-2022 Teemu Ikonen
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# SPDX-License-Identifier: GPL-3.0-only
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import os
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from datetime import datetime, timezone
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import gi
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gi.require_version('Gdk', '3.0')
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from gi.repository import Gdk # noqa: E402
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gps_epoch = datetime(1980, 1, 6, 0, 0, tzinfo=timezone.utc)
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now = datetime.now(timezone.utc)
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one_week = 7 * 24 * 60 * 60
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week_now = int((now.timestamp() - gps_epoch.timestamp()) / one_week)
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def have_touchscreen():
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"""Return True if the default seat of default display has touch capability."""
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return bool(Gdk.Display.get_default_seat(
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Gdk.Display.get_default()).get_capabilities() & Gdk.SeatCapabilities.TOUCH)
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def datetime_from_gpstime(week, millisecs, fix_week=False):
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"""Return a datetime from GPS week number and milliseconds from week start.
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If fix_week is True, set the bits above 10 in week number from
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current date, see
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https://en.wikipedia.org/wiki/GPS_week_number_rollover
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"""
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if fix_week:
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week = (week & 0b1111111111) + ((week_now >> 10) << 10)
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return datetime.fromtimestamp(
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gps_epoch.timestamp() + week * one_week + (millisecs / 1000),
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timezone.utc)
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def gpstime_from_datetime(dt):
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"""Return a (gps_week, millisec) tuple from a datetime object."""
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if dt < gps_epoch:
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raise ValueError("Time cannot be less than GPS epoch")
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ts = dt.timestamp()
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epoch_ts = gps_epoch.timestamp()
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gps_week = int((ts - epoch_ts) / one_week)
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millisecs = 1000 * int(ts - epoch_ts - (gps_week * one_week))
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return gps_week, millisecs
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def unique_filename(namestem, ext, timestamp=False):
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if timestamp:
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namestem += "-" + datetime.now().isoformat(
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'_', 'seconds').replace(':', '.')
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name = None
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for count in ('~%d' % n if n > 0 else '' for n in range(100)):
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test = namestem + count + ext
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if os.path.exists(test):
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continue
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else:
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name = test
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break
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return name
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def bearing_to_arrow(bearing):
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# Arrows in bearing order, with up arrow (north) repeating at the end
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arrows = [
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'\u2191',
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'\u2197',
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'\u2192',
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'\u2198',
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'\u2193',
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'\u2199',
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'\u2190',
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'\u2196',
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'\u2191',
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]
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edges = [22.5 + 45.0 * n for n in range(0, 8)] + [360.0]
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angle = bearing - (bearing // 360) * 360
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index = next(ind for (ind, e) in enumerate(edges) if angle < e)
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return arrows[index]
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