PyQtGraph – Getting Pixel Size of Plot Window

0 0 2 minutes read

In this article we will see how we can get pixel size of the 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.Pixels, abbreviated as “px”, are also a unit of measurement commonly used in graphic and web design, equivalent to roughly 1⁄96 inch (0.26 mm). This measurement is used to make sure a given element will display as the same size no matter what screen resolution views it.

We can create a plot window with the help of command given below

# creating a pyqtgraph plot window
window = pg.plot()

In order to do this we use pixelSize method with the plot window object

Syntax : window.pixelSize()

Argument : It takes no argument

Return : It returns Point object

Below is the implementation

# 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() 
  
# title 
title = "zambiatek PyQtGraph"
  
  
  
# setting window title 
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 
bargraph1 = pg.BarGraphItem(x = x, height = y1, width = 0.6, brush ='g') 
  
# add item to plot window 
# adding bargraph item to the window 
window.addItem(bargraph1) 
  
# getting plot item 
value = window.pixelSize() 
  
# printing the value 
print("Pixel Size : ", end ="") 
print(value) 
  
window.enableMouse(True) 
      
# 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_() 
         