Plotter.py

import matplotlib.pyplot as plt

class Plotter:

    def __init__(self,rangeval,minval,maxval):
        # You probably won't need this if you're embedding things in a tkinter plot...
        import matplotlib.pyplot as plt
        plt.ion()

        self.x = []
        self.y = []
        self.z = []
        self.w = []

        self.fig = plt.figure()
        self.ax = self.fig.add_subplot(111)

        self.line1, = self.ax.plot(self.x,'r', label='X') # Returns a tuple of line objects, thus the comma
        self.line2, = self.ax.plot(self.y,'g', label='Y')
        self.line3, = self.ax.plot(self.z,'b', label='Z')
        self.line4, = self.ax.plot(self.w,'y', label='W')

        self.rangeval = rangeval
        self.ax.axis([0, rangeval, minval, maxval])
        self.plcounter = 0
        self.plotx = []

    def plotdata(self,new_values):
        # is  a valid message struct
        #print (new_values)

        self.x.append( float(new_values[0]))
        self.y.append( float(new_values[1]))
        self.z.append( float(new_values[2]))
        self.w.append( float(new_values[3]))

        self.plotx.append( self.plcounter )

        self.line1.set_ydata(self.x)
        self.line2.set_ydata(self.y)
        self.line3.set_ydata(self.z)
        self.line4.set_ydata(self.w)

        self.line1.set_xdata(self.plotx)
        self.line2.set_xdata(self.plotx)
        self.line3.set_xdata(self.plotx)
        self.line4.set_xdata(self.plotx)

        self.fig.canvas.draw()
        plt.pause(0.0001)

        self.plcounter = self.plcounter+1

        if self.plcounter > self.rangeval:
          self.plcounter = 0
          self.plotx[:] = []
          self.x[:] = []
          self.y[:] = []
          self.z[:] = []
          self.w[:] = []