78 lines
2.3 KiB
Python
78 lines
2.3 KiB
Python
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'''
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Compass example
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===============
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This example is a demonstration of Hardware class usage.
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But it has severals drawbacks, like using only the magnetic sensor, and
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extrapolating values to get the orientation. The compass is absolutely not
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accurate.
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The right way would be to get the accelerometer + magnetic, and computer
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everything according to the phone orientation. This is not the purpose of this
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example right now.
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You can compile it with::
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./build.py --package org.test.compass --name compass \
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--private ~/code/kivy/examples/android/compass \
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--window --version 1.0 debug installd
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'''
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import kivy
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kivy.require('1.7.0')
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from jnius import autoclass
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from math import floor
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from kivy.app import App
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from kivy.properties import NumericProperty
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from kivy.clock import Clock
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from kivy.vector import Vector
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from kivy.animation import Animation
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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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# fix animation transition around the unit circle
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if (self.needle_angle % 360) - needle_angle > 180:
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needle_angle += 360
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elif (self.needle_angle % 360) - needle_angle < -180:
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needle_angle -= 360
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# add the number of revolutions to the result
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needle_angle += 360 * floor(self.needle_angle / 360.)
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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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