adding as one of multiple widgets in a PyQt6 Window

[EarlyBird]

When I add 2 plots as widgets from Pandas DataFrame's into one layout, it shows 2 plots with its unique toolbar. Works fine, thats why I do not show this code.

When I try to combine 1 Pandas DataFrame plot with one mplfinance as 2 widgets into one layout, it shows at first one window with the mplfinance content and after closing the window a second unique window appears and shows the 1 Pandas DataFrame plot.

How do I place a mplfinance plot with other non mplfinance tables, plots or other in one window?
In this example I want to stack the 2 windows vertically.

My code:

import sys, os
from PyQt6.QtWidgets import (QApplication, QWidget, QMainWindow, QVBoxLayout)
        #QLineEdit, QPushButton, QLabel,
        #QMessageBox, QGraphicsView, QGraphicsScene,
        #QFontComboBox)
#from PyQt6.QtGui import QMovie, QFont, QFontInfo, QPixmap
#from PyQt6.QtCore import QTimer
#from PyQt6 import uic
import matplotlib
import pandas as pd
from matplotlib.backends.backend_qtagg import (FigureCanvasQTAgg,
        NavigationToolbar2QT as NavigationToolbar)
from matplotlib.figure import Figure
import matplotlib.pyplot as plt
#from inspect import getmembers, isfunction
#import random
import yfinance as yf
import mplfinance as mpf

class MplCanvas(FigureCanvasQTAgg):
    def __init__(self, parent=None, width=5, height=4, dpi=100):
        fig=Figure(figsize=(width, height), dpi=dpi)
        self.axes = fig.add_subplot(111)
        super().__init__(fig)

class MainWindow(QMainWindow):
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        sc1 = MplCanvas(self, width=5, height=4, dpi=100)
        df = pd.DataFrame([
            [0,10,2.876],
            [5,15,6],
            [2,20,5],
            [15,25,25],
            [4,10,0],
            ],
            columns=["A","B","C"])
        df.plot(ax=sc1.axes)
        sc2 = MplCanvas(self, width=5, height=4, dpi=100)
        ticker_symbol = 'AAPL'
        header = ticker_symbol + ' Candlestick Chart'
        s_d = yf.download(ticker_symbol,start='2023-09-01',end='2024-10-01')
        toolbar = NavigationToolbar(sc1, self)
        toolbar2 = NavigationToolbar(sc2, self)
        layout = QVBoxLayout()
        layout.addWidget(toolbar)
        layout.addWidget(sc1)
        layout.addWidget(toolbar2)
        layout.addWidget(mpf.plot(s_d, type='candle', style='charles', title=header))
        widget = QWidget()
        widget.setLayout(layout)
        self.setCentralWidget(widget)

if __name__ == '__main__':
    app = QApplication(sys.argv)
    window = MainWindow()
    window.show()
    sys.exit(app.exec())

Regards
Sven

[SGaist]

Thanks for the feedback and example !

One thing: you should cleanup your super call, since Python 3, it does not need parameters anymore.

[jsulm]

@EarlyBird said in adding as one of multiple widgets in a PyQt6 Window:

mpf.plot(s_d, type='candle', style='charles', title=header)

What does this return? I guess it is not a QWidget.
Does mplfinance have anything to do with Qt at all?

[EarlyBird]

Hi jsulm,

mpf.plot(... does not return anything. My question is how do I connect mplfinance with Qt using PyQt6.
Running mplfinance in notebooks is ok until you want a standalone app.

Qt itself has nothing to do with mplfinance. Qt is graphical framework and mplfinance creates a content I would like to use in Qt.

[SGaist]

Hi,

mplfinance sounds like matplotlib and it has a backend for Qt.

Check this tutorial to integrate matplotlib with PyQt5. It should likely translate to what you are doing now.

[EarlyBird]

Hi SGaist,
did that, it nests matplotlib items with the QVBoxLayout:

There is also a totarial on this website that does that with PyQt6.

But with mplfinance, I did not find a way to connect the plot to a layout. This only with mplfinance.
Any gues or advice?

[SGaist]

This stack overflow thread might give you a starting point even though it's about 3D volumes, there's an example that uses mplfinance.

[EarlyBird]

@SGaist, @jsulm its fixed. Thanks for your help and the link, that gave the hint where to look. Daniel from mplfinance gave me another tip. You first put every plot into a figure, preventing mpf.plot to send it to the window and add the figures into any QxLayout with layout.addWidget(figure), call xxx.show().
This is the working code to display:

#pyqt6 - PyQt6_V2.0_Designer_08.10.2024.py
import sys, os
from PyQt6.QtWidgets import (QApplication, QWidget, QMainWindow, QVBoxLayout)
        #QLineEdit, QPushButton, QLabel,
        #QMessageBox, QGraphicsView, QGraphicsScene,
        #QFontComboBox)
#from PyQt6.QtGui import QMovie, QFont, QFontInfo, QPixmap
#from PyQt6.QtCore import QTimer
#from PyQt6 import uic
import matplotlib
matplotlib.use('QtAgg')
import pandas as pd
from matplotlib.backends.backend_qtagg import (FigureCanvasQTAgg,
        NavigationToolbar2QT as NavigationToolbar)
from matplotlib.figure import Figure
import matplotlib.pyplot as plt
#from inspect import getmembers, isfunction
#import random
import yfinance as yf
import mplfinance as mpf

class MplCanvas(FigureCanvasQTAgg):
    def __init__(self, fig):
        super(MplCanvas,self).__init__(fig)

class MainWindow(QMainWindow):
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)

        #Pandas data
        df = pd.DataFrame([
            [0,10,2.876],
            [5,15,6],
            [2,20,5],
            [15,25,25],
            [4,10,0],
            ],
            columns=["A","B","C"])

        #Pandas plot
        fig1, ax = plt.subplots()
        ax.plot(df)
        sc1 = MplCanvas(fig1)

        # finance data
        ticker_symbol = 'AAPL'
        header = ticker_symbol + ' Candlestick Chart'
        s_d = yf.download(ticker_symbol,start='2023-09-01',end='2024-10-01')
        fig2, axes = mpf.plot(s_d, type='candle', style='charles', title=header,returnfig=True)
        sc2 = MplCanvas(fig2)

        #PyQt6 setup
        toolbar = NavigationToolbar(sc1, self)
        toolbar2 = NavigationToolbar(sc2, self)
        layout = QVBoxLayout()
        layout.addWidget(toolbar2)
        layout.addWidget(sc2)
        layout.addWidget(toolbar)
        layout.addWidget(sc1)
        widget = QWidget()
        widget.setLayout(layout)
        self.setCentralWidget(widget)
        self.show()

if __name__ == '__main__':
    app = QApplication(sys.argv)
    window = MainWindow()
    window.show()
    sys.exit(app.exec())

[SGaist]

Thanks for the feedback and example !

One thing: you should cleanup your super call, since Python 3, it does not need parameters anymore.

[EarlyBird]

Thanks @SGaist, did that.