PyQtGraph - Getting Visibility Property of Error Bar Graph

PyQtGraph - Getting Visibility Property of Error Bar Graph

In pyqtgraph, the ErrorBarItem class is used to display error bars on graphs. If you want to check the visibility of an error bar graph (or any other item in pyqtgraph), you can use the isVisible() method. This method is inherited from the parent QGraphicsItem class and is available for all graphics items in pyqtgraph.

Here's an example on how to create an error bar graph in pyqtgraph and check its visibility:

import sys import numpy as np import pyqtgraph as pg from PyQt5.QtWidgets import QApplication, QPushButton, QVBoxLayout, QWidget class ErrorBarDemo(QWidget): def __init__(self): super().__init__() layout = QVBoxLayout() # Create a PlotWidget self.plotWidget = pg.PlotWidget() layout.addWidget(self.plotWidget) # Data x = np.arange(5) y = np.array([2, 4, 6, 8, 10]) err = np.array([0.5, 1.0, 0.8, 0.3, 0.7]) # Error bars self.error_bar = pg.ErrorBarItem(x=x, y=y, height=err, beam=0.5) self.plotWidget.addItem(self.error_bar) # Line plot for visual reference self.plotWidget.plot(x, y) # Button to check visibility btn = QPushButton("Check Visibility", self) btn.clicked.connect(self.checkVisibility) layout.addWidget(btn) self.setLayout(layout) def checkVisibility(self): is_visible = self.error_bar.isVisible() if is_visible: print("Error Bar Graph is visible.") else: print("Error Bar Graph is not visible.") app = QApplication(sys.argv) mainWin = ErrorBarDemo() mainWin.show() sys.exit(app.exec_())

In the example:

  1. We've set up a simple PyQt application with pyqtgraph to display a graph with error bars.
  2. A button is provided which, when pressed, checks if the error bars are visible and prints the result to the console.
  3. The visibility status is checked using the isVisible() method.

You can modify the code and use self.error_bar.setVisible(False) somewhere to hide the error bars and then check its visibility using the button.

More Tags

hibernate-validator xcode7 jks iformfile fadeout to-date bundling-and-minification row-value-expression http-request similarity

More Programming Guides

Other Guides

More Programming Examples