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