What is the easiest way to achieve realtime plotting in pyqtgraph

python python-2.7 pyqt pyqt4 pyqtgraph
dan_0 picture dan_0 · Aug 6, 2013 · Viewed 21.3k times · Source

I do not get how to achieve realtime plotting in pyqtgraph. The realisation of that is not implemented in the documentation yet.

Could anyone please provide an easy example ?

Answer

Luke picture Luke · Aug 6, 2013

Pyqtgraph only enables realtime plotting by being quick to draw new plot data. How to achieve realtime plotting is highly dependent on the details and control flow in your application.

The most common ways are:

  1. Plot data within a loop that makes calls to QApplication.processEvents().

    pw = pg.plot()
while True:
    ...
    pw.plot(x, y, clear=True)
    pg.QtGui.QApplication.processEvents()

  2. Use a QTimer to make repeated calls to a function that updates the plot.

    pw = pg.plot()
timer = pg.QtCore.QTimer()
def update():
    pw.plot(x, y, clear=True)
timer.timeout.connect(update)
timer.start(16)

Related questions

how to retrieve the selected row of a QTableView?

I'm using a QTableView object types. This object contains several online and I use this model: class PaletteTableModel(QtCore.QAbstractTableModel): def __init__(self,colors = [[]],headers =[],parent=None): QtCore.QAbstractTableModel.__init__(self, parent) self.__colors=colors self._headers=headers def rowCount(…

Read More
PyQt4: Difference between QWidget and QMainWindow

When reading through a PyQt4 tutorial, sometimes the examples uses QtGui.QMainWindow, sometimes it uses QtGui.QWidget. Question: How do you tell when to use which? import sys from PyQt4 import QtGui class Example(QtGui.QMainWindow): def __init__(self): super(…

Read More
QTableWidget - Change the row color

I'm trying to change the background color of a QTableWidget row. There are some others posts about the same thing but none of the given solutions worked for me. With that solution, we are setting the background on an already …

Read More