Plotting Data with Timestamps using PyQtGraph

31 Aug, 2021
In this article, we will see how we can plot data with timestamps using the PyQtGraph module in Python. 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 the second is to provide tools to aid in rapid application development (for example, property trees such as used in Qt Designer).
In order to install the PyQtGraph we use the command given below.
pip install pyqtgraph
A timestamp is a sequence of characters or encoded information identifying when a certain event occurred, usually giving date and time of day, sometimes accurate to a small fraction of a second. In this tutorial we will see how we can plot timestamps on x-axis and y-axis will have corresponding data with it.
In order to do so we have to do the following 
Import the required libraries like pyqtgraph, pyqt5, time and numpyCreate a main window class using pyqt5Create a graph window having axisitem set as DateAxisItem for timestampsNow create a data to plot in this example we will plot the sin(1/x^2) with timestamps in the last 100 yearsWith this data plot the line graphAdd the graph and other widgets to the layout of central widget of main window.
Import the required libraries like pyqtgraph, pyqt5, time and numpy
Create a main window class using pyqt5
Create a graph window having axisitem set as DateAxisItem for timestamps
Now create a data to plot in this example we will plot the sin(1/x^2) with timestamps in the last 100 years
With this data plot the line graph
Add the graph and other widgets to the layout of central widget of main window.
Below is the implementation.
Python3
# importing Qt widgetsfrom PyQt5.QtWidgets import * # importing systemimport sys # time moduleimport timefrom datetime import datetime, timedelta # importing numpy as npimport numpy as np # importing pyqtgraph as pgimport pyqtgraph as pgfrom PyQt5.QtGui import *from PyQt5.QtCore import *  class Window(QMainWindow):     def __init__(self):        super().__init__()         # setting title        self.setWindowTitle("PyQtGraph")         # setting geometry        self.setGeometry(100, 100, 900, 550)         # icon        icon = QIcon("skin.png")         # setting icon to the window        self.setWindowIcon(icon)         # calling method        self.UiComponents()         # showing all the widgets        self.show()     # method for components    def UiComponents(self):         # creating a widget object        widget = QWidget()         # text        text = "Timestamps Plot"         # creating a label        label = QLabel(text)         # setting minimum width        label.setMinimumWidth(130)         # making label do word wrap        label.setWordWrap(True)         # Create a plot with a date-time axis (timestamps on x-axis)        w = pg.PlotWidget(axisItems={'bottom': pg.DateAxisItem()})         # show the grids  on the graph        w.showGrid(x=True, y=True)         # Plotting sin(1/x^2) with timestamps in the last 100 years        now = time.time()         # x data        x = np.linspace(2 * np.pi, 1000 * 2 * np.pi, 8301)         # plot the data        w.plot(now - (2 * np.pi / x) ** 2 * 100 *               np.pi * 1e7, np.sin(x), symbol='o')         # Creating a grid layout        layout = QGridLayout()         # minimum width value of the label        label.setMinimumWidth(130)         # setting this layout to the widget        widget.setLayout(layout)         # adding label in the layout        layout.addWidget(label, 1, 0)         # plot window goes on right side, spanning 3 rows        layout.addWidget(w, 0, 1, 3, 1)         # setting this widget as central widget of the main window        self.setCentralWidget(widget)  # create pyqt5 appApp = QApplication(sys.argv) # create the instance of our Windowwindow = Window() # start the appsys.exit(App.exec())
Output :  
 
gabaa406
Python-PyQtGraph
Python
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