PyQtGraph – Checking if Bar Graph is Visible

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In this article we will see how we can check if the bar graph is visible or not 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. Bar graph can be made invisible or can be hide with the help of hide method.

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 use isVisible method with the bar graph object

Syntax : bargraph.isVisible()

Argument : It takes no argument

Return : It returns bool

Below is the implementation

# importing QtGui to use QIcon 
from PyQt5.QtGui import * from PyQt5.QtCore import Qt  
  
# importing pyqtgraph as pg 
import pyqtgraph as pg 
  
# importing QtCore and QtGui from the pyqtgraph module 
from pyqtgraph.Qt import QtCore, QtGui 
  
# importing numpy as np 
import numpy as np 
  
import time 
  
# creating a pyqtgraph plot window 
window = pg.plot() 
  
# icon for plot window 
icon = QIcon("logo.png") 
  
# setting icon to the plot window 
window.setWindowIcon(icon) 
  
# setting window geometry 
# left = 100, top = 100 
# width = 600, height = 500 
window.setGeometry(100, 100, 600, 500) 
  
# title for the plot window 
title = "zambiatek PyQtGraph"
  
# setting window title to plot window 
window.setWindowTitle(title) 
  
# 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 window 
window.addItem(bargraph) 
  
# hiding the bargraph 
bargraph.hide() 
    
  
# checking if bar graph is visible 
value = bargraph.isVisible() 
  
# printing the value 
print("Bar Graph is Visible  : " + str(value)) 
  
  
# main method 
if __name__ == '__main__': 
      
    # importing system 
    import sys 
      
    # Start Qt event loop unless running in interactive mode or using  
    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'): 
        QtGui.QApplication.instance().exec_() 
         