通过 deleting/replacing 旧值更新 matplotlib 子图图形

Question

我写了一个非常简单的代码来在 matplotlib 子图中绘制散点图。我可以使用 plot() 函数根据 x, y1 的值进行绘图。我想知道我是否通过另一个函数得到了新值，例如 y2 ，如何在图中更新它？我检查了这方面的其他帖子，有一些建议在 update() 函数中使用 clear()、destroy()、delete()，但其中 none 有效。我想保留 canvas 和数字的设置，只用旧值替换新值。

import tkinter as tk
from matplotlib.figure import Figure
from matplotlib.backends.backend_tkagg import (FigureCanvasTkAgg, NavigationToolbar2Tk)


class Data:
    def __init__(self):
        self.x = tk.IntVar()


class SampleApp(tk.Tk):
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.minsize(700, 700)
        container = tk.Frame(self)
        container.pack()

        self.data = Data()

        self.frames = {}
        for F in (PageOne, ):
            frame = F(container, self.data)
            self.frames[F] = frame
            frame.grid(row=0, column=0, sticky="nsew")

    def show_frame(self, c):
        frame = self.frames[c]
        frame.tkraise()


class PageOne(tk.Frame):
    def __init__(self, parent, data):
        super().__init__(parent)
        self.data = data

        self.button1 = tk.Button(self, text="Plot", command=self.plot)
        self.button1.pack()

        self.button2 = tk.Button(self, text="update", command=self.update)
        self.button2.pack()

        self.frame = tk.LabelFrame(self)
        self.frame.pack()

    def plot(self):
        global x
        x = [1,2,3,4,5,6,7,8,9]
        y1 = [1,2,3,4,5,6,7,8,9]

        self.figure = Figure(figsize=(4, 4))
        ax = self.figure.add_subplot(111)
        ax.scatter(x, y1)
        ax.set_title('Test')
        ax.set_xlabel('x')
        ax.set_ylabel('y')

        canvas = FigureCanvasTkAgg(self.figure, self.frame)
        canvas.draw()
        canvas.get_tk_widget().pack()
        toolbar = NavigationToolbar2Tk(canvas, self.frame)
        toolbar.pack()
        canvas.get_tk_widget().pack()

    def update(self):
        global x
        self.figure.clear()
        y2 = [1, 2, 3, 4, 5, 4, 3, 2, 1]

app = SampleApp()
app.mainloop()

Answer 1

我结合了我的建议和我在 another post 中找到的内容，使它起作用。

我是这样做的，只修改了你的 update 函数。

    def update(self):
        global x
        self.figure.clear()
        ax = self.figure.add_subplot(111)
        ax.set_title('Test')
        ax.set_xlabel('x')
        ax.set_ylabel('y')
        x = [1,2,3,4,5,6,7,8,9]
        y2 = [1, 2, 3, 4, 5, 4, 3, 2, 1]
        ax.scatter(x, y2)
        self.figure.canvas.draw()

这是我使用 set_data 方法完成的。


import tkinter as tk
from matplotlib.figure import Figure
from matplotlib.backends.backend_tkagg import (FigureCanvasTkAgg, NavigationToolbar2Tk)


class Data:
    def __init__(self):
        self.x = tk.IntVar()


class SampleApp(tk.Tk):
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.minsize(700, 700)
        container = tk.Frame(self)
        container.pack()

        self.data = Data()

        self.frames = {}
        for F in (PageOne, ):
            frame = F(container, self.data)
            self.frames[F] = frame
            frame.grid(row=0, column=0, sticky="nsew")

    def show_frame(self, c):
        frame = self.frames[c]
        frame.tkraise()


class PageOne(tk.Frame):
    def __init__(self, parent, data):
        super().__init__(parent)
        self.data = data

        self.button1 = tk.Button(self, text="Plot", command=self.plot)
        self.button1.pack()

        self.button2 = tk.Button(self, text="update", command=self.update)
        self.button2.pack()

        self.frame = tk.LabelFrame(self)
        self.frame.pack()


    def plot(self):
        global x
        x = [1,2,3,4,5,6,7,8,9]
        y1 = [1,2,3,4,5,6,7,8,9]

        self.figure = Figure(figsize=(4, 4))
        ax = self.figure.add_subplot(111)
        l = ax.plot(x, y1, lw=0, marker='o') # Changed here
        self.line1 = l[0] # Changed here
        ax.set_title('Test')
        ax.set_xlabel('x')
        ax.set_ylabel('y')

        canvas = FigureCanvasTkAgg(self.figure, self.frame)
        canvas.draw()
        canvas.get_tk_widget().pack()
        toolbar = NavigationToolbar2Tk(canvas, self.frame)
        toolbar.pack()
        canvas.get_tk_widget().pack()

    def update(self):
        global x
        y2 = [1, 2, 3, 4, 5, 4, 3, 2, 1]
        self.line1.set_data(x, y2) # Changed here
        self.figure.canvas.draw()  # Changed here <-- without this, won't redraw

app = SampleApp()
app.mainloop()

您的代码中有一些奇怪的东西，例如 global x 未使用，但那是以后的事了。

通过 deleting/replacing 旧值更新 matplotlib 子图图形

Updating the matplotlib subplot figure by deleting/replacing the old values

python

tkinter

matplotlib