PyQtGraph - 使用条形图添加 Qt 小部件

在本文中，我们将看到如何在 PyQtGraph 模块中添加带有条形图的 Qt 小部件。 PyQtGraph 是一个用于Python的图形和用户界面库，它提供了设计和科学应用程序中通常需要的功能。它的主要目标是提供用于显示数据（绘图、视频等）的快速交互式图形，其次是提供帮助快速应用程序开发的工具（例如，Qt Designer 中使用的属性树）。条形图或条形图是一种图表或图形，它用矩形条显示分类数据，矩形条的高度或长度与其所代表的值成正比。条形可以垂直或水平绘制。垂直条形图有时也称为柱形图。 Qt 有许多多用途小部件，可以将它们与条形图一起添加，使其更具交互性。

我们可以在下面给出的命令的帮助下创建一个绘图窗口和条形图

# creating a pyqtgraph plot window
window = pg.plot()

# creating a bar graph of green color
bargraph = pg.BarGraphItem(x=x, height=y1, width=0.6, brush='g')

In order to do this we have to do the following
1. Import the QWidgets from the PyQt5
2. Import the pyqtgraph module
3. Create the main window class
4. Add various feature to the main window class
5. Create different types of QtWidgets
6. Create a plot window in which bar graph is added
7. Create a grid layout and add different widgets and plot window to it
8. Set the layout widget as the central widget of the window

编程需要懂一点英语

下面是实现

# importing Qt widgets
from PyQt5.QtWidgets import * import sys
  
# importing pyqtgraph as pg
import pyqtgraph as pg
  
  
  
class Window(QMainWindow):
  
    def __init__(self):
        super().__init__()
  
        # setting title
        self.setWindowTitle("PyQtGraph")
  
        # setting geometry
        self.setGeometry(100, 100, 600, 500)
  
        # calling method
        self.UiComponents()
  
        # showing all the widgets
        self.show()
  
    # method for components
    def UiComponents(self):
  
        # creating a widget object
        widget = QWidget()
  
        # creating a push button object
        btn = QPushButton('Push Button')
  
        # creating a line edit widget
        text = QLineEdit("Line Edit")
  
        # creating a check box widget
        check = QCheckBox("Check Box")
  
        # creating a plot window
        plot = pg.plot()
  
        # create list for y-axis
        y1 = [5, 5, 7, 10, 3, 8, 9, 1, 6, 2]
  
        # create horizontal list i.e x-axis
        x = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
  
        # create pyqt5graph bar graph item
        # with width = 0.6
        # with bar colors = green
        bargraph = pg.BarGraphItem(x = x, height = y1, width = 0.6, brush ='g')
  
        # add item to plot window
        # adding bargraph item to the plot window
        plot.addItem(bargraph)
  
        # Creating a grid layout
        layout = QGridLayout()
  
        # setting this layout to the widget
        widget.setLayout(layout)
  
        # adding widgets in the layout in their proper positions
        # button goes in upper-left
        layout.addWidget(btn, 0, 0)
  
        # text edit goes in middle-left
        layout.addWidget(text, 1, 0)
  
        # check box widget goes in bottom-left
        layout.addWidget(check, 3, 0)
  
        # plot window goes on right side, spanning 3 rows
        layout.addWidget(plot, 0, 1, 3, 1)
  
        # setting this widget as central widget of the main widow
        self.setCentralWidget(widget)
  
  
# create pyqt5 app
App = QApplication(sys.argv)
  
# create the instance of our Window
window = Window()
  
# start the app
sys.exit(App.exec())

输出：