问题
first of all I hope you have me some patience since I'm new on these kind of projects and I also hope not to be asking dumb questions. That being said, my main objective is to create a UI for a raspberry pi 3 which will sense voltage, current, etc from a battery and from a solar panel.
Since I'm working on a raspberry and have some knowledge on Python3, I decided to use QTCreator which as I understand can be translated into python3 through pyqt (https://nikolak.com/pyqt-qt-designer-getting-started/). I installed it on my raspberry pi and made the following UI:
after having a basic UI, I converted the .ui file into .py with the pyuic5 command and I'm able to open the UI with "python3 main.py" and everything seems right:
how the UI looks after opening the main.py file
Now, I want to have a several plots (like voltage against time, etc) on the UI. I'm using the following for testing:
import sys
import pyqtgraph as pg
from pyqtgraph.Qt import QtCore, QtGui
import numpy as np
pg.setConfigOption('background', 'w')
pg.setConfigOption('foreground', 'k')
win = pg.GraphicsWindow()
win.setWindowTitle('pyqtgraph example: Scrolling Plots')
p1 = win.addPlot(labels = {'left':'Voltage', 'bottom':'Time'})
data1 = np.random.normal(size=10)
data2 = np.random.normal(size=10)
curve1 = p1.plot(data1, pen=(3,3))
curve2 = p1.plot(data2, pen=(2,3))
ptr1 = 0
def update1():
global data1, curve1, data2, ptr1
data1[:-1] = data1[1:] # shift data in the array one sample left
# (see also: np.roll)
data1[-1] = np.random.normal()
ptr1 += 1
curve1.setData(data1)
curve1.setPos(ptr1,0)
data2[:-1] = data2[1:] # shift data in the array one sample left
# (see also: np.roll)
data2[-1] = np.random.normal()
curve2.setData(data2)
curve2.setPos(ptr1,0)
def update():
update1()
timer = pg.QtCore.QTimer()
timer.timeout.connect(update)
timer.start(2000) # number of seconds (every 1000) for next update
if __name__ == '__main__':
QtGui.QApplication.instance().exec_()
Is it possible to embbed that plot into my main.py file? If I understood correctly, I'm supposed to use the promoting widget functionality on QTCreator. Thanks in advance guys!
回答1:
What is promoted through Qt Designer is a Widget, ie a class, so it can not be directly promoted, what we must do is place it inside a class as shown below:
Plotter.py
class CustomWidget(pg.GraphicsWindow):
pg.setConfigOption('background', 'w')
pg.setConfigOption('foreground', 'k')
ptr1 = 0
def __init__(self, parent=None, **kargs):
pg.GraphicsWindow.__init__(self, **kargs)
self.setParent(parent)
self.setWindowTitle('pyqtgraph example: Scrolling Plots')
p1 = self.addPlot(labels = {'left':'Voltage', 'bottom':'Time'})
self.data1 = np.random.normal(size=10)
self.data2 = np.random.normal(size=10)
self.curve1 = p1.plot(self.data1, pen=(3,3))
self.curve2 = p1.plot(self.data2, pen=(2,3))
timer = pg.QtCore.QTimer(self)
timer.timeout.connect(self.update)
timer.start(2000) # number of seconds (every 1000) for next update
def update(self):
self.data1[:-1] = self.data1[1:] # shift data in the array one sample left
# (see also: np.roll)
self.data1[-1] = np.random.normal()
self.ptr1 += 1
self.curve1.setData(self.data1)
self.curve1.setPos(self.ptr1, 0)
self.data2[:-1] = self.data2[1:] # shift data in the array one sample left
# (see also: np.roll)
self.data2[-1] = np.random.normal()
self.curve2.setData(self.data2)
self.curve2.setPos(self.ptr1,0)
if __name__ == '__main__':
w = CustomWidget()
w.show()
QtGui.QApplication.instance().exec_()
Before proceeding I will assume that the files have the following structure:
.
├── main.py
└── Plotter.py
- The first thing to do is choose the widget:
- Then we right click on this and choose the option to promote to..:
- In the dialog box we place CustomWidget in Promoted Class Name and Plotter.h in Header File, then press the Add and Promote button.
- Then we convert our .ui file to .py
来源：https://stackoverflow.com/questions/45872255/embed-a-pyqtgraph-plot-into-a-qt-ui