In this article we will see how we can add Qt widgets with the bar graph in the PyQtGraph module. PyQtGraph is a graphics and user interface library for Python that provides functionality commonly required in designing and science applications. Its primary goals are to provide fast, interactive graphics for displaying data (plots, video, etc.) and second is to provide tools to aid in rapid application development (for example, property trees such as used in Qt Designer).A bar chart or bar graph is a chart or graph that presents categorical data with rectangular bars with heights or lengths proportional to the values that they represent. The bars can be plotted vertically or horizontally. A vertical bar chart is sometimes called a column chart. Qt have lots of multipurpose widgets which can be added with the bar graph so that it can become more interactive.
We can create a plot window and bar graph with the help of commands given below
# 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
Below is the implementation
Python3
# importing Qt widgetsfrom PyQt5.QtWidgets import * import sys# importing pyqtgraph as pgimport pyqtgraph as pgclass 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 window self.setCentralWidget(widget)# create pyqt5 appApp = QApplication(sys.argv)# create the instance of our Windowwindow = Window()# start the appsys.exit(App.exec()) |
Output :
