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PyQtGraph – Getting Scene Position of Bar Graph
  • Last Updated : 14 Oct, 2020

In this article we will see how we can get scene position of 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. A transformation specifies how to translate, scale, shear, rotate or project the coordinate system, and is typically used when rendering graphics.

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 scenePos method with the bar graph object

Syntax : bargraph.scenePos()

Argument : It takes no argument

Return : It returns QPointF object

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
# setting window geometry
# left = 100, top = 100
# width = 600, height = 500
window.setGeometry(100, 100, 600, 500)
# title for the plot window
title = "GeeksforGeeks PyQtGraph"
# setting window title to plot window
# 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
# getting scene position of the bar graph
value = bargraph.scenePos()
# printing the value
print("scene Position : " + 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'):

Output :

scene Position : PyQt5.QtCore.QPointF(57.8830959623175, 458.9691668562489)

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