問題描述

所以...我一直在嘗試讓 kivy 使用 matplotlib 繪制實時生成的數據.我之前在 TkInter 中使用過與此類似的代碼，它就像一個魅力，所以我真的很困惑為什么它在這里不起作用.

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.

代碼如下:

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()

我想讓它繪制線，每秒 1 個點.但相反，我得到了這個:

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

似乎畫布沒有重繪.我究竟做錯了什么?

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

推薦答案

根據@ImportanceOfBeingErnest 的建議，需要更新坐標區限制.

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

以下代碼應該可以解決您的問題:

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()

這篇關于在 Python 中使用 matplotlib 和 kivy 進行實時繪圖的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網！