PyQtGraph – Setting Bounding Region Granularity of Error Bar Graph
source link: https://www.geeksforgeeks.org/pyqtgraph-setting-bounding-region-granularity-of-error-bar-graph/
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PyQtGraph – Setting Bounding Region Granularity of Error Bar Graph
In this article we will see how we can set bounding region granularity of the error 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.). Error bars are graphical representations of the variability of data and used on graphs to indicate the error or uncertainty in a reported measurement. They give a general idea of how precise a measurement is, or conversely, how far from the reported value the true value might be. Position of error bar item is basically the position of the data from origin which is by default 0, 0 although it can be changed any time. Granularity, the condition of existing in granules or grains, refers to the extent to which a material or system is composed of distinguishable pieces.
We can create a plot window and create error bar graph on it with the help of commands given below
# creating a pyqtgraph plot window plt = pg.plot() # creating a error bar item object error = pg.ErrorBarItem(x=x, y=y, top=top, bottom=bottom, beam=0.5)
In order to do this we use setBoundingRegionGranularity method with the error bar item object
Syntax : error.setBoundingRegionGranularity(n)
Argument : It takes float value as argument
Return : It returns None
Below is the implementation
- Python3
# importing Qt widgetsfrom PyQt5.QtWidgets import *# importing systemimport sys# importing numpy as npimport numpy as np# importing pyqtgraph as pgimport pyqtgraph as pgfrom PyQt5.QtGui import *from PyQt5.QtCore import *from collections import namedtupleclass Window(QMainWindow):def __init__(self):super().__init__()# setting titleself.setWindowTitle("PyQtGraph")# setting geometryself.setGeometry(100, 100, 600, 500)# iconicon = QIcon("skin.png")# setting icon to the windowself.setWindowIcon(icon)# calling methodself.UiComponents()# showing all the widgetsself.show()# method for componentsdef UiComponents(self):# creating a widget objectwidget = QWidget()# creating a labellabel = QLabel("Geeksforgeeks Error Bar plot")# setting minimum widthlabel.setMinimumWidth(130)# making label do word wraplabel.setWordWrap(True)# setting configuration optionspg.setConfigOptions(antialias=True)# creating x-axis valuesx = np.array([1, 2, 3, 4, 5, 6, 7, 8, 9, 10])# creating y-axis valuesy = np.array([5, 4, 3, 2, 5, 6, 4, 8, 9, 8])# creating upper bound valuestop = np.array([2, 2, 2, 2, 2, 2, 2, 2, 2, 2])# creating lower bound valuesbottom = np.array([2, 2, 2, 2, 2, 2, 2, 2, 2, 2])# creating a plot windowplt = pg.plot()# creating a error bar itemerror = pg.ErrorBarItem(beam=0.5)# setting data to error bar itemerror.setData(x=x, y=y, top=top, bottom=bottom)# adding error bar item to the plot windowplt.addItem(error)# plotting the data on plot windowplt.plot(x, y, symbol='o', pen={'color': 0.8, 'width': 2})# Creating a grid layoutlayout = QGridLayout()# minimum width value of the labellabel.setMinimumWidth(130)# setting this layout to the widgetwidget.setLayout(layout)# adding label in the layoutlayout.addWidget(label, 1, 0)# plot window goes on right side, spanning 3 rowslayout.addWidget(plt, 0, 1, 3, 1)# setting this widget as central widget of the main widowself.setCentralWidget(widget)# setting bounding region granularityerror.setBoundingRegionGranularity(0.5)# create pyqt5 appApp = QApplication(sys.argv)# create the instance of our Windowwindow = Window()# start the appsys.exit(App.exec())Output :
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