PyQtGraph - Setting Horizontal Range of Plot Window

PyQtGraph - Setting Horizontal Range of Plot Window

In PyQtGraph, setting the horizontal range of a plot window can be done using the setXRange method of the plot widget. This method allows you to specify the minimum and maximum values of the X-axis, effectively setting the horizontal range of your plot.

Here's a basic example to demonstrate how to set the horizontal range of a plot window using PyQtGraph:

Example Code

import sys import pyqtgraph as pg from PyQt5.QtWidgets import QApplication, QMainWindow class MainWindow(QMainWindow): def __init__(self): super().__init__() # Create a plot widget self.plot_widget = pg.PlotWidget() # Set plot data x = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10] y = [10, 20, 40, 80, 40, 20, 10, 5, 2, 1] self.plot_widget.plot(x, y) # Set the horizontal range of the plot self.plot_widget.setXRange(2, 8, padding=0) # Set the central widget of the window self.setCentralWidget(self.plot_widget) self.setWindowTitle("PyQtGraph Example - Horizontal Range") if __name__ == '__main__': app = QApplication(sys.argv) main = MainWindow() main.show() sys.exit(app.exec_())

Explanation

  • pg.PlotWidget: This creates a plot widget where you can plot your data.
  • plot_widget.plot(x, y): This line plots the data points defined by x and y.
  • plot_widget.setXRange(min, max, padding): This method sets the horizontal range of the plot. min and max define the range of the X-axis. padding is optional and adds some space around the data to make it clearer.
  • Main Window Setup: The plot widget is set as the central widget of a QMainWindow.

Running the Example

To run this example:

  1. Install pyqtgraph and PyQt5 if you haven't already. You can install them via pip:
    pip install pyqtgraph pyqt5
  2. Copy the example code into a Python file.
  3. Run the script. You should see a window with a plot whose horizontal range is set between 2 and 8.

This example demonstrates a basic application. Depending on your specific requirements, you might want to adjust the range dynamically or in response to user input or other data changes.

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