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PyQtGraph – Getting Plot Item from Plot Window

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In this article we will see how we can get the plot item of plot window 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).Plot windows consist of two main parts: the Plot Panel containing the actual plotted graphics and the Control Panel. Plot item is basically the item which is plotted and is shown on the screen.
 

In order to do this we use getPlotItem method with the plot window object
Syntax : window.getPlotItem()
Argument : It takes no argument
Return : It returns PlotItem object 
 


Below is the implementation 
 

Python3

# 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
 
# define the data
title = "GeeksforGeeks PyQtGraph"
 
# y values to plot by line 1
y = [2, 8, 6, 8, 6, 11, 14, 13, 18, 19]
 
# y values to plot by line 2
y2 = [3, 1, 5, 8, 9, 11, 16, 17, 14, 16]
x = range(0, 10)
 
# create plot window object
plt = pg.plot()
 
# showing x and y grids
plt.showGrid(x = True, y = True)
 
# adding legend
plt.addLegend()
 
# set properties of the label for y axis
plt.setLabel('left', 'Vertical Values', units ='y')
 
# set properties of the label for x axis
plt.setLabel('bottom', 'Horizontal Values', units ='s')
 
# setting horizontal range
plt.setXRange(0, 10)
 
# setting vertical range
plt.setYRange(0, 20)
 
# setting window title
plt.setWindowTitle(title)
 
# plotting line in green color
line1 = plt.plot(x, y, pen ='g', symbol ='x', symbolPen ='g', symbolBrush = 0.2, name ='green')
 
# plotting line2 with blue color
line2 = plt.plot(x, y2, pen ='b', symbol ='o', symbolPen ='b', symbolBrush = 0.2, name ='blue')
 
# 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_()

                    

Output : 
 


 

Plot Item : pyqtgraph.graphicsItems.PlotItem.PlotItem.PlotItem object at 0x000002AF5282B8B0


 



Last Updated : 19 Apr, 2023
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