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          


        

Answer 1

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:

<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
 <class>MainWindow</class>
 <widget class="QMainWindow" name="MainWindow">
  <property name="geometry">
   <rect>
    <x>0</x>
    <y>0</y>
    <width>800</width>
    <height>600</height>
   </rect>
  </property>
  <property name="windowTitle">
   <string>MainWindow</string>
  </property>
  <widget class="QWidget" name="centralwidget">
   <widget class="QPushButton" name="pushButton">
    <property name="geometry">
     <rect>
      <x>210</x>
      <y>280</y>
      <width>88</width>
      <height>33</height>
     </rect>
    </property>
    <property name="text">
     <string>PushButton</string>
    </property>
   </widget>
   <widget class="QPushButton" name="pushButton_2">
    <property name="geometry">
     <rect>
      <x>340</x>
      <y>80</y>
      <width>88</width>
      <height>33</height>
     </rect>
    </property>
    <property name="text">
     <string>Test Trade</string>
    </property>
   </widget>
   <widget class="QWidget" name="chart_container" native="true">
    <property name="geometry">
     <rect>
      <x>29</x>
      <y>29</y>
      <width>291</width>
      <height>231</height>
     </rect>
    </property>
   </widget>
  </widget>
  <widget class="QMenuBar" name="menubar">
   <property name="geometry">
    <rect>
     <x>0</x>
     <y>0</y>
     <width>800</width>
     <height>24</height>
    </rect>
   </property>
  </widget>
  <widget class="QStatusBar" name="statusbar"/>
 </widget>
 <resources/>
 <connections/>
</ui>

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_())