PyQtGraph – Getting Plot Item from Plot Window

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

filter_none

edit
close

play_arrow

link
brightness_4
code

# 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 Vlaues', units ='s')
  
# setting horizontal range
plt.setXRange(0, 10)
  
# setting vertical range
plt.setYRange(0, 20)
  
# setting window title
plt.setWindowTitle(title)
  
# ploting line in green color
line1 = plt.plot(x, y, pen ='g', symbol ='x', symbolPen ='g', symbolBrush = 0.2, name ='green')
  
# ploting 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_()

chevron_right


Output :

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

Attention geek! Strengthen your foundations with the Python Programming Foundation Course and learn the basics.

To begin with, your interview preparations Enhance your Data Structures concepts with the Python DS Course.




My Personal Notes arrow_drop_up

Check out this Author's contributed articles.

If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.

Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below.


Article Tags :

Be the First to upvote.


Please write to us at contribute@geeksforgeeks.org to report any issue with the above content.