lbry-fdroid/p4a/doc/source/old_toolchain/example_compass.rst
Akinwale Ariwodola 744cfaebc2 Initial commit
2017-08-13 02:24:00 +01:00

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Compass
-------
The following example is an extract from the Compass app as provided in the Kivy
`examples/android/compass <https://github.com/kivy/kivy/tree/master/examples/android/compass/>`__
folder:
.. code-block:: python
# ... imports
Hardware = autoclass('org.renpy.android.Hardware')
class CompassApp(App):
needle_angle = NumericProperty(0)
def build(self):
self._anim = None
Hardware.magneticFieldSensorEnable(True)
Clock.schedule_interval(self.update_compass, 1 / 10.)
def update_compass(self, *args):
# read the magnetic sensor from the Hardware class
(x, y, z) = Hardware.magneticFieldSensorReading()
# calculate the angle
needle_angle = Vector(x , y).angle((0, 1)) + 90.
# animate the needle
if self._anim:
self._anim.stop(self)
self._anim = Animation(needle_angle=needle_angle, d=.2, t='out_quad')
self._anim.start(self)
def on_pause(self):
# when you are going on pause, don't forget to stop the sensor
Hardware.magneticFieldSensorEnable(False)
return True
def on_resume(self):
# reactivate the sensor when you are back to the app
Hardware.magneticFieldSensorEnable(True)
if __name__ == '__main__':
CompassApp().run()
If you compile this app, you will get an APK which outputs the following
screen:
.. figure:: Screenshot_Kivy_Kompass.png
:width: 100%
:scale: 60%
:figwidth: 80%
:alt: Screenshot Kivy Compass
Screenshot of the Kivy Compass App
(Source of the Compass Windrose: `Wikipedia <http://en.wikipedia.org/wiki/Compass_rose>`__)