I want to read data and plot dynamic graph, so I learn matplotlib with PyQt5. I find example but it's for PyQt4, there I modify it to PyQt5 but it had some problem, when I click start button it says error
Traceback (most recent call last): File
"/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/matplotlib/backend_bases.py",
line 1305, in _on_timer
ret = func(*args, **kwargs) File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/matplotlib/animation.py",
line 1049, in _step
still_going = Animation._step(self, *args) File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/matplotlib/animation.py",
line 855, in _step
self._draw_next_frame(framedata, self._blit) File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/matplotlib/animation.py",
line 873, in _draw_next_frame
self._pre_draw(framedata, blit) File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/matplotlib/animation.py",
line 886, in _pre_draw
self._blit_clear(self._drawn_artists, self._blit_cache) File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/matplotlib/animation.py",
line 926, in _blit_clear
a.figure.canvas.restore_region(bg_cache[a]) KeyError: matplotlib.axes._subplots.AxesSubplot object at 0x1067718d0
This is my code:
import sys, os, random
from PyQt5 import QtCore
from PyQt5.QtWidgets import *
import numpy as np
from matplotlib.backends.backend_qt5agg import FigureCanvasQTAgg as FigureCanvas
from matplotlib.figure import Figure
import matplotlib.animation as animation
class MyMplCanvas(FigureCanvas):
"""Ultimately, this is a QWidget (as well as a FigureCanvasAgg, etc.)."""
def __init__(self, parent=None, width=5, height=4, dpi=100):
fig = Figure(figsize=(width, height), dpi=dpi)
self.axes = fig.add_subplot(111)
# We want the axes cleared every time plot() is called
self.axes.hold(False)
self.compute_initial_figure()
#
FigureCanvas.__init__(self, fig)
self.setParent(parent)
def compute_initial_figure(self):
pass
class AnimationWidget(QWidget):
def __init__(self):
QMainWindow.__init__(self)
vbox = QVBoxLayout()
self.canvas = MyMplCanvas(self, width=5, height=4, dpi=100)
vbox.addWidget(self.canvas)
hbox = QHBoxLayout()
self.start_button = QPushButton("start", self)
self.stop_button = QPushButton("stop", self)
self.start_button.clicked.connect(self.on_start)
self.stop_button.clicked.connect(self.on_stop)
hbox.addWidget(self.start_button)
hbox.addWidget(self.stop_button)
vbox.addLayout(hbox)
self.setLayout(vbox)
self.x = np.linspace(0, 5*np.pi, 400)
self.p = 0.0
self.y = np.sin(self.x + self.p)
self.line, = self.canvas.axes.plot(self.x, self.y, animated=True, lw=2)
def update_line(self, i):
self.p += 0.1
y = np.sin(self.x + self.p)
self.line.set_ydata(y)
return [self.line]
def on_start(self):
self.ani = animation.FuncAnimation(self.canvas.figure, self.update_line,
blit=True, interval=25)
def on_stop(self):
self.ani._stop()
if __name__ == "__main__":
qApp = QApplication(sys.argv)
aw = AnimationWidget()
aw.show()
sys.exit(qApp.exec_())
