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'''
This example uses Kivy Garden Graph addon to draw graphs plotting the
accelerometer values in X,Y and Z axes.
The package is installed in the directory: ./libs/garden/garden.graph
To read more about kivy garden, visit: http://kivy-garden.github.io/.
'''
import kivy
from kivy.app import App
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.popup import Popup
from kivy.clock import Clock
from plyer import accelerometer
from kivy.garden.graph import MeshLinePlot
kivy.require('1.8.0')
class AccelerometerDemo(BoxLayout):
def __init__(self):
super().__init__()
self.sensorEnabled = False
self.graph = self.ids.graph_plot
# For all X, Y and Z axes
self.plot = []
self.plot.append(MeshLinePlot(color=[1, 0, 0, 1])) # X - Red
self.plot.append(MeshLinePlot(color=[0, 1, 0, 1])) # Y - Green
self.plot.append(MeshLinePlot(color=[0, 0, 1, 1])) # Z - Blue
self.reset_plots()
for plot in self.plot:
self.graph.add_plot(plot)
def reset_plots(self):
for plot in self.plot:
plot.points = [(0, 0)]
self.counter = 1
def do_toggle(self):
try:
if not self.sensorEnabled:
accelerometer.enable()
Clock.schedule_interval(self.get_acceleration, 1 / 20.)
self.sensorEnabled = True
self.ids.toggle_button.text = "Stop Accelerometer"
else:
accelerometer.disable()
self.reset_plots()
Clock.unschedule(self.get_acceleration)
self.sensorEnabled = False
self.ids.toggle_button.text = "Start Accelerometer"
except NotImplementedError:
popup = ErrorPopup()
popup.open()
def get_acceleration(self, dt):
if (self.counter == 100):
# We re-write our points list if number of values exceed 100.
# ie. Move each timestamp to the left.
for plot in self.plot:
del plot.points[0]
plot.points[:] = [(i[0] - 1, i[1]) for i in plot.points[:]]
self.counter = 99
val = accelerometer.acceleration[:3]
if not val == (None, None, None):
self.plot[0].points.append((self.counter, val[0]))
self.plot[1].points.append((self.counter, val[1]))
self.plot[2].points.append((self.counter, val[2]))
self.counter += 1
class AccelerometerDemoApp(App):
def build(self):
return AccelerometerDemo()
def on_pause(self):
return True
class ErrorPopup(Popup):
pass
if __name__ == '__main__':
AccelerometerDemoApp().run()
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