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The Unurin
Asked:2024-03-05 00:39:54 +0000 UTC2024-03-05 00:39:54 +0000 UTC

matplotlib 图不会因 valueChanged QSlider 信号而改变

  • 772

当我尝试使用滑块信号更改matplotlib条形图的高度时，没有任何反应。

主要.py：

import sys
from PyQt6.QtWidgets import QApplication, QMainWindow, QHBoxLayout, QSlider, QWidget
import matplotlib
import matplotlib.pyplot as plt
matplotlib.use('qt5agg')
from matplotlib.backends.backend_qt5agg import FigureCanvasQTAgg


class Canvas(FigureCanvasQTAgg):
    def __init__(self):
        fig = plt.figure()
        self.ax = fig.add_subplot()
        super(Canvas, self).__init__(fig)


class Window(QMainWindow):
    def __init__(self):
        super().__init__()

        self.slider = QSlider()
        self.slider.valueChanged.connect(self.move_slider)

        self.canva = Canvas()
        self.bar = self.canva.ax.bar(0, 99)
        
        layout = QHBoxLayout()
        layout.addWidget(self.canva)
        layout.addWidget(self.slider)
        
        cont = QWidget()
        cont.setLayout(layout)

        self.setCentralWidget(cont)

        # self.bar[0].set_height(1)

    def move_slider(self, value):
        self.bar[0].set_height(1)
        print("Slider moved!")
    

app = QApplication(sys.argv)
w = Window()
w.show()
app.exec()

当滑块移动时，会向控制台发送一条消息，并且图形保持相同的高度。
此外，如果您通过函数更改高度__init__，那么它会以某种方式起作用。
我无法弄清楚问题是什么？

python

1 个回答

  1. Best Answer

    调用方法draw()。
    Python FigureCanvasQTAgg.draw 使用示例

    安装您的导入并尝试：

    import sys
'''
from PyQt6.QtWidgets import QApplication, QMainWindow, QHBoxLayout, QSlider, QWidget
'''
from PyQt5.Qt import *

import matplotlib
import matplotlib.pyplot as plt
matplotlib.use('qt5agg')
from matplotlib.backends.backend_qt5agg import FigureCanvasQTAgg


class Canvas(FigureCanvasQTAgg):
    def __init__(self):
        fig = plt.figure()
        self.ax = fig.add_subplot()
        super(Canvas, self).__init__(fig)


class Window(QMainWindow):
    def __init__(self):
        super().__init__()
        self.centralWidget = QWidget()
        self.setCentralWidget(self.centralWidget)

        self.slider = QSlider()
        self.slider.valueChanged.connect(self.move_slider)

        self.canva = Canvas()
        self.bar = self.canva.ax.bar(0, 99)
        
        layout = QHBoxLayout(self.centralWidget)
        layout.addWidget(self.canva)
        layout.addWidget(self.slider)

        self.bar[0].set_height(0)                                      # +++

    def move_slider(self, value):
#        self.bar[0].set_height(1)
        self.bar[0].set_height(value)                                  # + value
        
        print(f"Slider moved! {value:>2} ---> {self.bar[0]}")
        self.canva.draw()                                              # +++


if __name__ == '__main__':
    app = QApplication(sys.argv)
    w = Window()
    w.show()
    sys.exit(app.exec())

    在此输入图像描述

    • 2

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