/
scroll_plot.py
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/
scroll_plot.py
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import sys, serial
import numpy as np
from time import sleep
from collections import deque
from matplotlib import pyplot as plt
from math import sin, cos, pi
# class that holds analog data for N samples
class AnalogData:
# constr
def __init__(self, maxLen):
self.ax = deque([0.0]*maxLen)
self.ay = deque([0.0]*maxLen)
self.az = deque([0.0]*maxLen)
self.maxLen = maxLen
# ring buffer
def addToBuf(self, buf, val):
if len(buf) < self.maxLen:
buf.append(val)
else:
buf.popleft()
buf.append(val)
# add data
def add(self, data):
assert(len(data) == 3)
self.addToBuf(self.az, data[0])
self.addToBuf(self.ax, data[1])
self.addToBuf(self.ay, data[2])
# plot class
class AnalogPlot:
# constr
def __init__(self, analogData):
# set plot to animated
plt.ion()
self.axline, = plt.plot(analogData.ax)
self.ayline, = plt.plot(analogData.ay)
self.plt = plt
plt.ylim([-2,2])
# update plot
def update(self, analogData):
ticks = range(len(analogData.az))[0::int(len(analogData.az)/5)]
myticks = list(analogData.az[i] for i in xrange(0, len(analogData.az),int(len(analogData.az)/4)))
self.plt.xticks(ticks, myticks)
self.axline.set_ydata(analogData.ax)
self.ayline.set_ydata(analogData.ay)
plt.draw()
# main() function
def main():
# plot parameters
analogData = AnalogData(101)
analogPlot = AnalogPlot(analogData)
print 'plotting data...'
num_arr = range(1000)
x = [x*2*pi/30 for x in range(101)]
y1 = [[t,sin(t),cos(t)] for t in x]
for y in y1:
data = y
#print data
if(len(data) == 3):
analogData.add(data)
analogPlot.update(analogData)
sleep(0.5)
# call main
if __name__ == '__main__':
main()