I'm trying to make a program in which an instance sends values to another
instance and it plots them continuously.
I programmed this using pypubsub to send values from one instance to the
other.
The other instance gets values and store them into a deque, and it plots
the deque whenever it is updates.
I think the instances communicate with one another well and I can see the
deque is updated every second as I planned,
however, the problem is that the graph doesn't show the deque's values
whenever it is updated, but rather it shows the values
once the whole updating has finished. I'd like to know how I can plot the
deque whenever it is updated.
from pyqtgraph.Qt import QtGui, QtCoreimport pyqtgraph as pg
from collections import dequefrom pubsub import pubimport time
class Plotter:
def __init__(self):
self.deq = deque()
self.pw = pg.GraphicsView()
self.pw.show()
self.mainLayout = pg.GraphicsLayout()
self.pw.setCentralItem(self.mainLayout)
self.p1 = pg.PlotItem()
self.p1.setClipToView=True
self.curve_1 = self.p1.plot(pen=None, symbol='o', symbolPen=None,
symbolSize=10, symbolBrush=(102, 000, 000, 255))
self.mainLayout.addItem(self.p1, row = 0, col=0, rowspan=2)
def plot(self, msg):
print('Plotter received: ', msg)
self.deq.append(msg)
print(self.deq)
self.curve_1.setData(self.deq)
class Sender:
def __init__(self):
self.list01 = [1,2,3,4,5] # A list of values that will be
sent through pub.sendMessage
def send(self):
for i in range(len(self.list01)):
pub.sendMessage('update', msg = self.list01[i] )
time.sleep(1)
plotterObj = Plotter()
senderObj = Sender()
pub.subscribe(plotterObj.plot, 'update')
senderObj.send()
>>> (executing file "<tmp 1>")
Plotter received: 1
deque([1])
Plotter received: 2
deque([1, 2])
Plotter received: 3
deque([1, 2, 3])
Plotter received: 4
deque([1, 2, 3, 4])
Plotter received: 5
deque([1, 2, 3, 4, 5])
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