Insert QChartView to ui

Question

I am trying to put plot candlestick and 5-days average line on a same qtchart but give two x axis plot code into a UI loader

import sys
from PyQt5.QtWidgets import QApplication, QWidget
from PyQt5.QtGui import QIcon
from PyQt5 import uic
import sys
from PyQt5.QtChart import QCandlestickSeries, QChart, QChartView, QCandlestickSet
from PyQt5.QtWidgets import QApplication, QMainWindow
from PyQt5.QtCore import Qt, QPointF
from PyQt5 import QtChart as qc

# load both ui file
uifile_1 = 'UI/main.ui'
form_1, base_1 = uic.loadUiType(uifile_1)

uifile_2 = 'UI/main1.ui'
form_2, base_2 = uic.loadUiType(uifile_2)


class Example(base_1, form_1):
    def __init__(self):
        super(base_1, self).__init__()
        self.setupUi(self)
        self.pushButton_2.clicked.connect(self.change)

    def change(self):
        self.main = MainPage()
        self.main.show()
        # self.close()


class MainPage(base_2, form_2):
    def __init__(self):
        super(base_2, self).__init__()
        self.setupUi(self)

if __name__ == '__main__':
    app = QApplication(sys.argv)
    ex = Example()
    ex.show()
    sys.exit(app.exec_())

I have tried putting a widget but have no idea what are promoted class name and header file for candlesticks.

The reason I want to do this is that I want to update this candlestick chart at a regular interval of time and also insert some buttons on that window.

UI

eyllanesc · Accepted Answer

It is not necessary to promote a class, although it is a valid option, so that it can be displayed in a window generated based on a .ui since you can use empty QWidget (without promoting it) as a container, then place a layout, and within the layout the QChartView.

The image shows an empty QWidget whose name is "chart_container" where the QChartView will be placed:

The code is then implemented by adding the QChartView to the container through a layout:

import sys

from PyQt5 import QtCore, QtWidgets, uic, QtChart

# load both ui file
uifile_1 = "UI/main.ui"
form_1, base_1 = uic.loadUiType(uifile_1)


class Example(base_1, form_1):
    def __init__(self):
        super(base_1, self).__init__()
        self.setupUi(self)

        data = (
            (1, 7380, 7520, 7380, 7510, 7324),
            (2, 7520, 7580, 7410, 7440, 7372),
            (3, 7440, 7650, 7310, 7520, 7434),
            (4, 7450, 7640, 7450, 7550, 7480),
            (5, 7510, 7590, 7460, 7490, 7502),
            (6, 7500, 7590, 7480, 7560, 7512),
            (7, 7560, 7830, 7540, 7800, 7584),
        )

        series = QtChart.QCandlestickSeries()
        series.setDecreasingColor(QtCore.Qt.red)
        series.setIncreasingColor(QtCore.Qt.green)

        ma5 = QtChart.QLineSeries()  # 5-days average data line
        tm = []  # stores str type data

        # in a loop,  series and ma5 append corresponding data
        for num, o, h, l, c, m in data:
            series.append(QtChart.QCandlestickSet(o, h, l, c))
            ma5.append(QtCore.QPointF(num, m))
            tm.append(str(num))

        chart = QtChart.QChart()
        chart.addSeries(series)  # candle
        chart.addSeries(ma5)  # ma5 line

        chart.setAnimationOptions(QtChart.QChart.SeriesAnimations)
        chart.createDefaultAxes()
        chart.legend().hide()

        chart.axisX(series).setCategories(tm)
        chart.axisX(ma5).setVisible(False)

        chartview = QtChart.QChartView(chart)

        self.chart_container.setContentsMargins(0, 0, 0, 0)
        lay = QtWidgets.QHBoxLayout(self.chart_container)
        lay.setContentsMargins(0, 0, 0, 0)
        lay.addWidget(chartview)


if __name__ == "__main__":
    app = QtWidgets.QApplication(sys.argv)
    ex = Example()
    ex.show()
    sys.exit(app.exec_())

Insert QChartView to ui

Answers (1)

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