103 lines
2.9 KiB
Python
103 lines
2.9 KiB
Python
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# SPDX-License-Identifier: LGPL-3.0-or-later
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# Copyright (C) 2020 Daniel Thompson
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"""Analogue clock
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~~~~~~~~~~~~~~~~~
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Shows the time as a traditional watch face together with a battery meter.
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.. figure:: res/ChronoApp.png
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:width: 179
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Screenshot of the analogue clock application
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"""
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import wasp
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class ChronoApp():
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"""Simple analogue clock application.
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"""
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NAME = 'Chrono'
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def foreground(self):
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"""Activate the application.
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Configure the status bar, redraw the display and request a periodic
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tick callback every second.
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"""
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wasp.system.bar.clock = False
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self._draw(True)
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wasp.system.request_tick(1000)
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def sleep(self):
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"""Prepare to enter the low power mode.
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:returns: True, which tells the system manager not to automatically
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switch to the default application before sleeping.
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"""
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return True
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def wake(self):
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"""Return from low power mode.
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Time will have changes whilst we have been asleep so we must
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udpate the display (but there is no need for a full redraw because
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the display RAM is preserved during a sleep.
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"""
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self._draw()
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def tick(self, ticks):
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"""Periodic callback to update the display."""
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self._draw()
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def _draw(self, redraw=False):
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"""Draw or lazily update the display.
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The updates are as lazy by default and avoid spending time redrawing
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if the time on display has not changed. However if redraw is set to
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True then a full redraw is be performed.
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"""
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draw = wasp.watch.drawable
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hi = wasp.system.theme('accent-hi')
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mid = wasp.system.theme('accent-mid')
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lo = wasp.system.theme('accent-lo')
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if redraw:
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now = wasp.watch.rtc.get_localtime()
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# Clear the display and draw that static parts of the watch face
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draw.fill()
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# Redraw the status bar
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wasp.system.bar.draw()
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# Draw the dividers
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draw.set_color(mid)
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for theta in range(12):
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draw.polar(120, 120, theta * 360 // 12, 111, 119, 2)
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self._hh = 0
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self._mm = 0
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else:
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now = wasp.system.bar.update()
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if not now or self._mm == now[4]:
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# Skip the update
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return
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# Undraw old time
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hh = (30 * (self._hh % 12)) + (self._mm / 2)
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mm = 6 * self._mm
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draw.polar(120, 120, hh, 5, 80, 5, 0)
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draw.polar(120, 120, mm, 5, 110, 3, 0)
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# Record the minute that is currently being displayed
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self._hh = now[3]
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self._mm = now[4]
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# Draw the new time
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hh = (30 * (self._hh % 12)) + (self._mm / 2)
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mm = 6 * self._mm
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draw.polar(120, 120, hh, 5, 80, 5, hi)
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draw.polar(120, 120, hh, 5, 60, 3, lo)
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draw.polar(120, 120, mm, 5, 110, 3, hi)
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