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Mathieu Virbel
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Compass
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=======
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Demonstrate the combination of the Android Magnetic Field Sensor and the Kivy functionality viewing a Compass.
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Kivy Python-For-Android
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-----------------------
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Please look at the lastest docs of the
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`Kivy Python-For-Android Project <http://python-for-android.readthedocs.org/en/latest/>`__
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Building an APK
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---------------
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::
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./distribute.sh -m "pyjnius kivy"
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::
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./build.py --package org.test.compass --name compass \
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--version 1.0 --dir ~/code/kivy/examples/android/compass debug
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title=Compass
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author=Nik Klever
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orientation=portrait
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import kivy
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kivy.require('1.3.0')
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import math
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import time
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from kivy.app import App
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from kivy.uix.floatlayout import FloatLayout
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from kivy.uix.button import Button
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from kivy.uix.scatter import Scatter
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from kivy.clock import Clock
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from kivy.vector import Vector
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from kivy.core.window import Window
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from kivy.graphics import Color, Ellipse, Rectangle, Triangle
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from kivy.logger import Logger
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from jnius import autoclass
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Logger.info('COMPASS: STARTED')
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def LoggerDisplayMetrics(metrics):
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"""
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Logging all values of the Java Android DisplayMetrics class
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to get some more information about the metrics of Android devices
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"""
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display = {'Default':metrics.DENSITY_DEFAULT,
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'Device':metrics.DENSITY_DEVICE,
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'High':metrics.DENSITY_HIGH,
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'Low':metrics.DENSITY_LOW,
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'Medium':metrics.DENSITY_MEDIUM,
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'XHIGH':metrics.DENSITY_XHIGH,
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'density':metrics.density,
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'densityDpi':metrics.densityDpi,
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'heightPixels':metrics.heightPixels,
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'scaledDensity':metrics.scaledDensity,
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'widthPixels':metrics.widthPixels,
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'xdpi':metrics.xdpi,
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'ydpi':metrics.ydpi}
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for (k,v) in display.items():
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Logger.info('COMPASS: display %s = %s'%(k,v))
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class CompassWidget(FloatLayout):
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def __init__(self, **kwargs):
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"""
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Constructor of the CompassWidget class
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"""
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super(CompassWidget, self).__init__(**kwargs)
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def build(self,pos,size):
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"""
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building the background of the CompassWidget with a circle of a
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compass windrose image
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(Source of this image: Wikipedia - http://en.wikipedia.org/wiki/Compass_rose)
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"""
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with self.canvas:
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self.pos = pos
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self.size = size
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self.windrose = Ellipse(source="500px-Windrose.svg.png", pos=pos, size=size)
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class NeedleWidget(Scatter):
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def __init__(self, **kwargs):
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"""
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Constructor of the NeedleWidget class
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do_rotation, do_translation, do_scale are all set to False
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to indicate that the scatter widget can onlybe updated from the
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app and not by an interaction with your fingers
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"""
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super(NeedleWidget, self).__init__(**kwargs)
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self.do_rotation = False
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self.do_translation = False
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self.do_scale = False
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self.auto_bring_to_front = True
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def rotateNeedle(self,angle):
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"""
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rotate the NeedleWidget with the parameter angle
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90 is subtracted because North of the windrose is at 90 degrees
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of the device
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"""
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self.rotation = angle - 90
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def build(self,center,needleSize):
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"""
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building the needle with two Triangles of different color
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"""
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self.pos = center - needleSize/2.
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self.size = needleSize
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self.size_hint = [None, None]
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with self.canvas:
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Color(1., 0, 0)
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needleTP1 = Vector(needleSize[0]/2.,needleSize[1])
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needleTP2 = Vector(needleSize[0]/2.,0)
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needleTP3 = Vector(-needleSize[0],needleSize[1]/2.)
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needlePoints = (needleTP1[0],needleTP1[1],
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needleTP2[0],needleTP2[1],
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needleTP3[0],needleTP3[1])
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self.needleT1 = Triangle(points=needlePoints)
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Color(0.5, 0.5, 0.5)
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needleTP3 = Vector(2*needleSize[0],needleSize[1]/2.)
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needlePoints = (needleTP1[0],needleTP1[1],
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needleTP2[0],needleTP2[1],
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needleTP3[0],needleTP3[1])
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self.needleT2 = Triangle(points=needlePoints)
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class CompassApp(App):
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def __init__(self, **kwargs):
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"""
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Constructor of the Compass App
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1) The Java Android API DisplayMetrics is called to get
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information about the densityDpi factor of the Android device
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2) The Kivy Python-For-Android Android API is called to
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get access to the hardware sensors of the Android device
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"""
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super(CompassApp, self).__init__(**kwargs)
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DisplayMetrics = autoclass('android.util.DisplayMetrics')
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metrics = DisplayMetrics()
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metrics.setToDefaults()
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LoggerDisplayMetrics(metrics)
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self.densityDpi = metrics.densityDpi
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Hardware = autoclass('org.renpy.android.Hardware')
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self.hw = Hardware()
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Logger.info('COMPASS: Hardware Objects: %s'%(str(dir(self.hw))))
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Logger.info('COMPASS: Hardware Sensors\n%s\n'%(self.hw.getHardwareSensors()))
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def viewCompass(self, *largs):
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"""
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viewCompass calls the readSensor method of the
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magneticFieldSensor instance of the generic3AxisSensor, it reads the
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3-tuple value of the magnetic field
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the declination angle is computed as the angle of the magnetic field
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vector in the x,y-plane and the unity-vector of the y-axis.
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afterwards the rotateNeedle function rotates the needle as given
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by the declination angle parameter
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"""
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(x, y, z) = self.hw.magneticFieldSensor.readSensor()
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declination = Vector(x,y).angle((0,1))
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#Logger.info('COMPASS: viewCompass x=%s y=%s z=%s declination=%s'%(x,y,z,declination))
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self.needle.rotateNeedle(declination)
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def stopApp(self,*largs):
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"""
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this function is called when pushed the stopButton, disables
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the magneticFieldSensor and stops the app
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"""
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self.hw.magneticFieldSensor.changeStatus(False)
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Logger.info('COMPASS: stop largs '+str(largs))
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self.stop()
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def build(self):
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"""
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Building all together:
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1) Creating the parent widget and clearing it to white background color
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2) Defining a suitable position and size of the CompassWidget, the
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needleSize and the stopButtonHeight depending on the densityDpi value
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given by DisplayMetrics
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3) Creating an instance of the CompassWidget and adding it to the
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parent widget and calling the appropriate build function
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4) Creating an instance of the NeedleWidget and adding it also to the
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parent widget and calling the appropriate build function
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5) Creating an instance of a Button widget and adding it as stopButton
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also to the parent widget and bind it with the stopApp function
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6) Calling the instance method changeStatus of the magneticFieldSensor
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instance with parameter True to enable the magnetic field sensor
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and additionally calling the function schedule_interval of the Clock
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class for a repeated call of the function viewCompass every second.
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"""
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parent = FloatLayout(size=(500,500))
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Window.clearcolor = (1, 1, 1, 1)
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if self.densityDpi == 240:
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CompassPos = Vector(50., 200.)
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CompassSize = Vector(400., 400.)
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needleSize = Vector(100., 60.)
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stopButtonHeight = 60
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elif self.densityDpi == 320:
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CompassPos = Vector(75., 300.)
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CompassSize = Vector(600., 600.)
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needleSize = Vector(150., 90.)
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stopButtonHeight = 90
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else:
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Logger.info('COMPASS: widget size should be adopted - minimum used for densityDpi=%s'%(str(self.densityDpi)))
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CompassPos = Vector(50., 200.)
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CompassSize = Vector(400., 400.)
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needleSize = Vector(100., 60.)
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stopButtonHeight = 60
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self.Compass = CompassWidget()
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parent.add_widget(self.Compass)
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self.Compass.build(pos=CompassPos,size=CompassSize)
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self.needle = NeedleWidget()
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parent.add_widget(self.needle)
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self.needle.build(center=CompassPos+CompassSize/2.,needleSize=needleSize)
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self.stopButton = Button(text='Stop', pos_hint={'right':1}, size_hint=(None,None), height=stopButtonHeight)
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parent.add_widget(self.stopButton)
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self.stopButton.bind(on_press=self.stopApp)
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self.hw.magneticFieldSensor.changeStatus(True)
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Clock.schedule_interval(self.viewCompass, 1.)
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return parent
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if __name__ in ('__main__', '__android__'):
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CompassApp().run()
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1323529642.46
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