Hi
I am using the development version 0.9.11 with pyQT5 on a windows machine.
I've created a descendant of PlotWidget that catches a pypubsub message
that is used to update the plot in the plotwidget.
The code for doing this is posted below. I seems to work OK, except for
the fact that the plot stops refreshing itself after the initial number of
samples is reached.
However, if I manually adjust the window size by using a mouse to drag the
edge of the window then the refresh does occur as I am doing the dragging.
If I stop adjusting the window size then the plot does not update.
Any suggestions as to how I can make the plot continuously update without
manual intervention.
Thanks
from __future__ import unicode_literals
import numpy as np
from pubsub import pub
import pyqtgraph_dev as pg
class ScatterPlotCanvas(pg.PlotWidget):
def __init__(self):
pg.PlotWidget.__init__(self)
self.xdata = [0]
self.ydata = [0]
self.curve = self.plot(pen='r')
self.enableAutoRange()
self.showButtons()
self.samples = 100
pub.subscribe(self.receiveData,'sensor.data')
def updateXY(self, xval, yval, samples):
if len(self.xdata) == 1:
self.xdata = [xval, xval]
self.ydata = [yval, yval]
else:
if len(self.xdata) > samples:
frm = len(self.xdata)-samples
self.xdata = self.xdata[frm:]
self.ydata = self.ydata[frm:]
self.xdata = np.append(self.xdata,xval)
self.ydata = np.append(self.ydata,yval)
self.curve.setData(x=self.xdata, y=self.ydata)
self.update()
#self.repaint()
#pg.QtGui.QApplication.processEvents()
def receiveData(self, arg1=None, arg2=None):
if arg1 is not None:
xval = arg2[0,:]
yval = arg2[1,:]
for x,y in zip(xval, yval):
self.updateXY(x, y, self.samples)
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