pythonmatplotlib共享绘图区域_在Python中使用Matplotlib和Kivy进行实时绘图

so... I've been trying to get kivy to plot data generated in real time, using matplotlib. I've used similar code to this one before in TkInter and it worked like a charm so I'm really confused why it does not work here.

Here's the code:

import numpy as np

import matplotlib

matplotlib.use('module://kivy.garden.matplotlib.backend_kivy')

from kivy.app import App

from kivy.uix.boxlayout import BoxLayout

from kivy.clock import Clock

import matplotlib.pyplot as plt

class MyApp(App):

def build(self):

box = BoxLayout()

self.fig,self.ax = plt.subplots(1)

self.plt_canvas = self.fig.canvas

box.add_widget(self.plt_canvas)

self.line = self.ax.plot([])[0]

self.i = 0

plt.show()

Clock.schedule_interval(self.update, 1)

return box

def update(self, *args):

self.line.set_xdata(np.arange(self.i))

self.line.set_ydata(np.arange(self.i))

self.i +=1

plt.draw()

MyApp().run()

I wanted to get it to plot the line, 1 point each second. But instead I get this:

Seems like the canvas is not redrawing. What am I doing wrong?

解决方案

As suggested by @ImportanceOfBeingErnest, the axes limits need to be updated.

The following code should solve your problem:

import matplotlib

matplotlib.use('module://kivy.garden.matplotlib.backend_kivy')

from kivy.app import App

from kivy.uix.boxlayout import BoxLayout

from kivy.clock import Clock

import matplotlib.pyplot as plt

fig, ax = plt.subplots()

canvas = fig.canvas

class MyApp(App):

def build(self):

box = BoxLayout()

self.i = 0

self.line = [self.i]

box.add_widget(canvas)

plt.show()

Clock.schedule_interval(self.update, 1)

return box

def update(self, *args):

plt.plot(self.line, self.line)

self.i += 1

self.line.append(self.i)

canvas.draw_idle()

MyApp().run()