MMAGraphTest.py

import MMA8451 as mma
import matplotlib.pyplot as plt
import matplotlib.animation as animation
from collections import deque

TAILLEN = 2

# Plot Class
class AnalogPlot:
	# constructor
	def __init__(self, accel, maxLen):
		self.accel = accel
		self.maxLen = maxLen
		self.ax = deque([0.0] * maxLen)
		self.ay = deque([0.0] * maxLen)
		self.az = deque([0.0] * maxLen)
		
	# add to buffer
	def addToBuf(self, buf, val):
		if len(buf) < self.maxLen:
			buf.append(val)
		else:
			buf.pop()
			buf.appendleft(val)
	
	# add data
	def add(self, x, y, z):
		self.addToBuf(self.ax, x)
		self.addToBuf(self.ay, y)
		self.addToBuf(self.az, z)

	# update plot
	def update(self, frameNum, a0, a1, a2, a3, a4, a5):
		x, y, z = self.accel.readScaledData()
		self.add(x, y, z)
		a0.set_data(self.ax, self.ay)
		a1.set_data(self.ax, self.az)
		a2.set_data(self.ay, self.ax)
		a3.set_data(self.ay, self.az)
		a4.set_data(self.az, self.ax)
		a5.set_data(self.az, self.ay)
		
if __name__ == '__main__':
	mma = mma.MMA8451()
	mma.setup()
	analogPlot = AnalogPlot(mma, TAILLEN)
	fig = plt.figure()
	ax = plt.axes(xlim=(-2, 2), ylim=(-2, 2))
	a0, = ax.plot([], [], label='XY')
	a1, = ax.plot([], [], label='XZ')
	a2, = ax.plot([], [], label='YX')
	a3, = ax.plot([], [], label='YZ')
	a4, = ax.plot([], [], label='ZX')
	a5, = ax.plot([], [], label='ZY')
	plt.legend(bbox_to_anchor=(0., 1.02, 1., .102), loc=3, ncol=6, mode="expand", borderaxespad=0.)
	anim = animation.FuncAnimation(fig, analogPlot.update, fargs=(a0, a1, a2, a3, a4, a5), interval=1)
	plt.show()