Add level app

Signed-off-by: Francesco Gazzetta <fgaz@fgaz.me>

README.rst

@@ -257,3 +257,7 @@ application (and the "blank" white screen is a torch application):
 .. image:: res/WordClkApp.png
    :alt: Shows a time as words in the wasp-os simulator
    :width: 179
+
+.. image:: res/LevelApp.png
+   :alt: Shows a time as words in the wasp-os simulator
+   :width: 179

apps/Level.py

@@ -0,0 +1,119 @@
+# SPDX-License-Identifier: LGPL-3.0-or-later
+# Copyright (C) 2021 Francesco Gazzetta
+"""Level application
+~~~~~~~~~~~~~~~~~~~~
+
+This app shows a dot that moves depending on the orientation of the watch.
+A tap opens a menu with the option to calibrate or reset the level.
+To calibrate, place the watch on a flat surface, then tap the "Calibrate"
+button while ensuring the watch is stationary.
+
+.. figure:: res/LevelApp.png
+    :width: 179
+"""
+
+import wasp
+import watch
+import widgets
+from micropython import const
+
+_X_MAX = const(240)
+_Y_MAX = const(240)
+_X_CENTER = const(120)
+_Y_CENTER = const(120)
+
+class LevelApp():
+    NAME = "Level"
+    # 2-bit RLE, 96x64, generated from res/level_icon.png, 410 bytes
+    ICON = (
+        b'\x02'
+        b'`@'
+        b'?\xff\xff\xff\xff\xff\xd0@\xa8L\x80r\x82\xc0\xfd\xf0'
+        b'\x82L\x13M\x82@\xb0O\xc1\x05\xc1\x04\xc1\x05\xc1O'
+        b'\x82\x80\xa8\x8d\x11\x8e\xc0r\xc2O@\xfdA\x05A\x04'
+        b'A\x05A\x80\xb0\x8f\xc2\xc0\xa8\xce\x10\xce@rB\x8f'
+        b'\x80\xfd\x81\x05\x81\x04\x81\x05\x81\xc0\xb0\xcfB@\xa8N'
+        b'\x10N\x80r\x82\xcf\xc0\xfd\xc1\x05\xc1\x04\xc1\x05\xc1@'
+        b'\xb0O\x82\x80\xa8\x8e\x10\x8e\xc0r\xc2O@\xfdA\x05'
+        b'A\x04A\x05A\x80\xb0\x8f\xc2\xc0\xa8\xce\x10\xce@r'
+        b'B\x8f\x80\xfd\x81\xc0\xb0\xc1\x04\x81\x04\x81\x04\xc1\x81\xcf'
+        b'B@\xa8N\x10N\x80r\x82\xcf\xc0\xfd\xc1@\xb0C'
+        b'\x02\xc1\x04\xc1\x02C\xc1O\x82\x80\xa8\x8e\x10\x8e\xc0r'
+        b'\xc2O@\xfdA\x80\xb0\x85A\x84A\x85A\x8f\xc2\xc0'
+        b'\xa8\xce\x10\xce@rB\x8f\x80\xfd\x81\xc0\xb0\xc5\x81\xc4'
+        b'\x81\xc5\x81\xcfB@\xa8N\x10N\x80r\x82\xcf\xc0\xfd'
+        b'\xc1@\xb0E\xc1D\xc1E\xc1O\x82\x80\xa8\x8e\x10\x8e'
+        b'\xc0r\xc2O@\xfdA\x80\xb0\x85A\x84A\x85A\x8f'
+        b'\xc2\xc0\xa8\xce\x10\xce@rC\x8e\x80\xfd\x81\xc0\xb0\xc5'
+        b'\x81\xc4\x81\xc5\x81\xceC@\xa8N\x10O\x80r\x82\xce'
+        b'\xc0\xfd\xc1@\xb0E\xc1D\xc1E\xc1N\x82\x80\xa8\x8f'
+        b'\x10\x8f\xc0r\xc3M@\xfdA\x80\xb0\x85A\x84A\x85'
+        b'A\x8d\xc3\xc0\xa8\xcf\x10\xd0@rD\x8b\x80\xfd\x81\xc0'
+        b'\xb0\xc5\x81\xc4\x81\xc5\x81\xcbD@\xa8P\x10Q\x80r'
+        b'\xaeQ\x10S\xaaS\x10\x7f\x11\x10\x7f\x11\x10\x7f\x11\x10'
+        b'\x7f\x11\x10\x7f\x11\x10\x7f\x11\x10\x7f\x11\x10\x7f\x11\x10\x7f'
+        b'\x11\x10\x7f\x11\x10\x7f\x11\x10\x7f\x11\x11\x7f\x0f\x13\x7f\r'
+        b'?\xff\xff\xff\xff\xff\xd0'
+    )
+
+    def __init__(self):
+        self.old_xy = (0,0)
+        self.calibration = (0,0)
+        self.prompt = False
+        self.calibrate = widgets.Button(20, 20, 200, 60, 'Calibrate')
+        self.reset = widgets.Button(20, 90, 200, 60, 'Reset')
+        self.cancel = widgets.Button(20, 160, 200, 60, 'Cancel')
+
+    def foreground(self):
+        self.prompt = False # in case the watch went to sleep with prompt on
+        self._draw()
+        wasp.system.request_event(wasp.EventMask.TOUCH)
+        wasp.system.request_tick(125)
+
+    def _draw(self):
+        wasp.watch.drawable.fill()
+        self._update()
+
+    def _update(self):
+        if not self.prompt:
+            draw = wasp.watch.drawable
+            draw.fill(None, self.old_xy[0] - 3 + _X_CENTER, self.old_xy[1] - 3 + _Y_CENTER, 6, 6)
+            # draw guide lines
+            draw.line(0, _Y_CENTER, _X_MAX, _Y_CENTER, color = wasp.system.theme('mid'))
+            draw.line(_X_CENTER, 0, _X_CENTER, _Y_MAX, color = wasp.system.theme('mid'))
+            # We save x as y and -y as x because we use the screen's coordinate
+            # system.
+            # We also clamp and scale the values down a bit to make them fit better,
+            # and apply the calibration
+            (new_y, new_x, _) = watch.accel.accel_xyz()
+            new_x = min(_X_CENTER, max(-_X_CENTER, (new_x-self.calibration[0])//-3))
+            new_y = min(_Y_CENTER, max(-_Y_CENTER, (new_y-self.calibration[1])//3))
+            draw.fill(wasp.system.theme('bright'), new_x - 3 + _X_CENTER, new_y - 3 + _Y_CENTER, 6, 6)
+            self.old_xy = (new_x, new_y)
+
+    def tick(self, ticks):
+        self._update()
+        wasp.system.keep_awake()
+
+    def touch(self, event):
+        if self.prompt:
+            # Handle buttons
+            if self.calibrate.touch(event):
+                (y, x, _) = watch.accel.accel_xyz()
+                self.calibration = (x, y)
+            if self.reset.touch(event):
+                self.calibration = (0,0)
+            #if self.cancel.touch(event):
+            #    pass
+
+            # reset the color (buttons set it to blue) and disable prompt
+            wasp.watch.drawable.set_color(wasp.system.theme('bright'))
+            self.prompt = False
+            self._draw()
+        else:
+            # Draw menu
+            self.prompt = True
+            wasp.watch.drawable.fill()
+            self.calibrate.draw()
+            self.reset.draw()
+            self.cancel.draw()

docs/apps.rst

@@ -57,6 +57,8 @@ Applications
 
 .. automodule:: apps.haiku
 
+.. automodule:: Level
+
 .. automodule:: Morse
 
 .. automodule:: apps.musicplayer