I am trying to plot some receiving data from a sensor using matplotlib.animation.FuncAnimation(). In addition, I would like to use blit=True because as far as I know it makes the program more efficient (taking advantage of the already plotted values and only refreshing the new ones).
However, when I use blit=True and autoscale_view() and relim() the x_axis values are not autoscaling and stay all time the same. So my question is if this is possible or blit option can only be used for "loop" o "repeating" graphs in which the x_axis is always the same (on Internet I only found examples likes these: sine graph, spirals...). Additionally, when using blit my graph seems to be blind or cut-out at some limit points (bottom and right side of the graph) so all points cannot be seen.
This is a example of my code (plotting random values instead of reading from sensor):
import sys, os, random, matplotlib
import numpy as np
from datetime import datetime
from PyQt5 import QtCore, QtWidgets
from PyQt5.QtWidgets import QApplication, QVBoxLayout, QSizePolicy, QWidget
from matplotlib.backends.backend_qt5agg import FigureCanvasQTAgg as FigureCanvas
from matplotlib.figure import Figure
import matplotlib.pyplot as plt
from matplotlib.animation import FuncAnimation
class MyMplCanvas(FigureCanvas):
def __init__(self, parent=None, width=5, height=4, dpi=100):
fig = Figure(figsize=(width, height), dpi=dpi)
self.ax = fig.add_subplot(1,1,1)
FigureCanvas.__init__(self, fig)
FigureCanvas.setSizePolicy(self,
QtWidgets.QSizePolicy.Expanding,
QtWidgets.QSizePolicy.Expanding)
FigureCanvas.updateGeometry(self)
class ApplicationWindow(QtWidgets.QMainWindow):
def __init__(self):
QtWidgets.QMainWindow.__init__(self)
self.setAttribute(QtCore.Qt.WA_DeleteOnClose)
self.setWindowTitle("application main window")
self.main_widget = QtWidgets.QWidget(self)
self.xdata = []
self.ydata = []
vbox = QtWidgets.QVBoxLayout(self.main_widget)
self.canvas = MyMplCanvas( self.main_widget,width=6, height=6, dpi=100) ###attention###
vbox.addWidget(self.canvas)
self.setLayout(vbox)
self.main_widget.setFocus()
self.setCentralWidget(self.main_widget)
self.line, = self.canvas.ax.plot_date(self.xdata, self.ydata,'-')
self.canvas.ax.tick_params(axis='x', rotation=50)
self.ani = FuncAnimation(self.canvas.figure, self.update_line, frames=self.gen_function_time, blit=True ,interval=1000)
def gen_function_time(self):
while True:
self.now = datetime.now()
yield self.now
def update_line(self, frame):
self.xdata.append(frame)
self.ydata.append(1+np.random.randint(-3,3))
self.line.set_data(self.xdata, self.ydata)
self.canvas.ax.relim()
self.canvas.ax.autoscale_view()
return self.line,
if __name__ == "__main__":
App = QApplication(sys.argv)
aw = ApplicationWindow()
aw.show()
App.exit()
sys.exit(App.exec_())
