Posted in Python onSeptember 15, 2020
参考网上的例子,实现了简单的matplotlib pyqt5绘图
相关知识点:
(1)pyqt5中添加控件要在布局中添加
(2)布局可以使用replaceWidget替换控件
(3)信号与槽机制
timer = QtCore.QTimer(self) timer.timeout.connect(self.update_figure) self.btnPlot.clicked.connect(self.plotButton_callback)
实现的效果
import sys from PyQt5 import QtCore, QtGui, uic from PyQt5.QtWidgets import QMainWindow, QAction, qApp, QApplication, QMessageBox, QVBoxLayout, QSizePolicy, QWidget from PyQt5.QtGui import QIcon from matplotlib.backends.backend_qt5agg import FigureCanvasQTAgg as FigureCanvas from matplotlib.figure import Figure import matplotlib.pyplot as plt import numpy as np qtCreatorFile = "matplotlib_ui.ui" # 使用uic加载 Ui_MainWindow, QtBaseClass = uic.loadUiType(qtCreatorFile) class MyMplCanvas(FigureCanvas): """这是一个窗口部件,即QWidget(当然也是FigureCanvasAgg)""" def __init__(self, parent=None, width=5, height=4, dpi=100): fig = Figure(figsize=(width, height), dpi=dpi) self.axes = fig.add_subplot(111) # 每次plot()调用的时候,我们希望原来的坐标轴被清除(所以False) self.axes.hold(False) self.axes.grid('on') self.compute_initial_figure() # FigureCanvas.__init__(self, fig) self.setParent(parent) FigureCanvas.setSizePolicy(self, QSizePolicy.Expanding, QSizePolicy.Expanding) FigureCanvas.updateGeometry(self) def compute_initial_figure(self): pass class MyStaticMplCanvas(MyMplCanvas): """静态画布:一条正弦线""" def compute_initial_figure(self): t = np.arange(0.0, 3.0, 0.01) s = np.sin(2 * np.pi * t) self.axes.grid('on') self.axes.plot(t, s) class MyDynamicMplCanvas(MyMplCanvas): """动态画布:每秒自动更新,更换一条折线。""" def __init__(self, *args, **kwargs): MyMplCanvas.__init__(self, *args, **kwargs) timer = QtCore.QTimer(self) timer.timeout.connect(self.update_figure) timer.start(1000) def compute_initial_figure(self): self.axes.grid('on') self.axes.plot([0, 1, 2, 3], [1, 2, 0, 4], 'r') def update_figure(self): # 构建4个随机整数,位于闭区间[0, 10] l = [np.random.randint(0, 10) for i in range(4)] self.axes.grid('on') self.axes.plot([0, 1, 2, 3], l, 'r') self.draw() class MyApp(QMainWindow, Ui_MainWindow): def __init__(self): QMainWindow.__init__(self) Ui_MainWindow.__init__(self) super().__init__() self.initUI() self.initBtn() self.initFrame() def initFrame(self): self.main_widget = self.frame self.layout = QVBoxLayout(self.main_widget) self.f = MyMplCanvas(self.main_widget) self.layout.addWidget(self.f) def initUI(self): self.setupUi(self) self.setWindowTitle("PyQt5结合Matplotlib绘图") self.setWindowIcon(QIcon("rocket.ico")) # 设置图标,linux下只有任务栏会显示图标 self.show() def initBtn(self): self.btnPlot.clicked.connect(self.plotButton_callback) self.btnPlot.setToolTip("Button") def plotButton_callback(self): self.drawFrame() def drawFrame(self): sc = MyStaticMplCanvas(self.main_widget, width=5, height=4, dpi=100) dc = MyDynamicMplCanvas(self.f, width=5, height=4, dpi=100) self.layout.addWidget(sc) self.layout.replaceWidget(self.f,dc) # 替换控件 if __name__ == '__main__': app = QApplication(sys.argv) ex = MyApp() sys.exit(app.exec_())
参考链接:https://www.cnblogs.com/hhh5460/p/4322652.html
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PyQt5结合matplotlib绘图的实现示例
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