Number of tick marks on the axis in QBarCategoryAxis.

[quant]

I still haven't been able to solve the problem. If I use the QDateTimeAxis axis for the candlestick chart, then when there is no data, empty gaps are obtained in the chart. I did as advised and created a line chart with the QDateTimeAxis axis, and for the candlestick chart I used the QValueAxis axis. But, it's still far from what need. On the chart, candlestick and line (int_line_serie) charts have a QValueAxis axis, another line chart (dt_line_serie) has a QDateTimeAxis axis. It can be seen that the first two match, but the linear (green line) QDateTimeAxis does not. I searched a lot how to create a QuantWeekdayTimeAxis subclass of QAbstractAxisClass but didn't find anything. Can someone tell me how to do this in pyqt or at least in C ++.

Need an axis so that I can adjust the number of divisions. In matplotlib, you can use the date time in string format, so this problem was solved.

a.jpg

from PyQt5 import QtWidgets, QtChart
from PyQt5.QtGui import QPen
from PyQt5.QtCore import *
from PyQt5.QtChart import *
import pandas_datareader.data as web
 
df = web.DataReader('GE', 'yahoo', start='2022-05-01', end='2022-05-25')
 
date = df.index
x = len(date)
 
qt = [None] * x
 
for i in range(0, x):
   qt[i] = QDateTime(date[i]).toMSecsSinceEpoch()
 
 
class MainWindow(QtWidgets.QMainWindow):
    def __init__(self, parent=None):
        super().__init__(parent)
 
        self._chart_view = QtChart.QChartView()
 
        central_widget = QtWidgets.QWidget()
        self.setCentralWidget(central_widget)
 
        lay = QtWidgets.QVBoxLayout(central_widget)
        lay.addWidget(self._chart_view)
 
        self._chart = QtChart.QChart()
        self._candlestick_serie = QtChart.QCandlestickSeries()
        self.dt_line_serie = QtChart.QLineSeries()
        self.int_line_serie = QtChart.QLineSeries()
 
        st = QPen(Qt.red)
        st.setWidth(3)
        self.int_line_serie.setPen(st)
 
        for i in range(0, len(df)):
            o_ = df.iloc[i, 2]
            h_ = df.iloc[i, 0]
            l_ = df.iloc[i, 1]
            c_ = df.iloc[i, 3]
            self._candlestick_serie.append(QtChart.QCandlestickSet(o_, h_, l_, c_, float(i)))
            self.dt_line_serie.append(qt[i], o_)
            self.int_line_serie.append(float(i), o_)
 
        self._chart.addSeries(self._candlestick_serie)
        self._chart.addSeries(self.dt_line_serie)
        self._chart.addSeries(self.int_line_serie)
        self._chart.legend().hide()
 
        self._chart_view.setChart(self._chart)
 
        axisX = QValueAxis()
        axisX.setLabelFormat("%d")
        self._chart.addAxis(axisX, Qt.AlignBottom)
        self._candlestick_serie.attachAxis(axisX)
        self.int_line_serie.attachAxis(axisX)
 
        axisX = QDateTimeAxis()
        axisX.setFormat("yyyy-MM-dd")
        self._chart.addAxis(axisX, Qt.AlignBottom)
        self.dt_line_serie.attachAxis(axisX)
 
        axisY = QValueAxis()
        self._chart.addAxis(axisY, Qt.AlignLeft)
        self._candlestick_serie.attachAxis(axisY)
        self.dt_line_serie.attachAxis(axisY)
        self.int_line_serie.attachAxis(axisY)
 
 
if __name__ == "__main__":
    import sys
 
    app = QtWidgets.QApplication(sys.argv)
    w = MainWindow()
    w.show()
    sys.exit(app.exec_())

from PyQt5 import QtWidgets, QtChart
from PyQt5.QtGui import QPen
from PyQt5.QtCore import *
from PyQt5.QtChart import *
import pandas_datareader.data as web

df = web.DataReader('GE', 'yahoo', start='2022-05-01', end='2022-05-25')

date = df.index
x = len(date)

qt = [None] * x

for i in range(0, x):
   qt[i] = QDateTime(date[i]).toMSecsSinceEpoch()


class MainWindow(QtWidgets.QMainWindow):
    def __init__(self, parent=None):
        super().__init__(parent)

        self._chart_view = QtChart.QChartView()

        central_widget = QtWidgets.QWidget()
        self.setCentralWidget(central_widget)

        lay = QtWidgets.QVBoxLayout(central_widget)
        lay.addWidget(self._chart_view)

        self._chart = QtChart.QChart()
        self._candlestick_serie = QtChart.QCandlestickSeries()
        self.dt_line_serie = QtChart.QLineSeries()
        self.int_line_serie = QtChart.QLineSeries()

        st = QPen(Qt.red)
        st.setWidth(3)
        self.int_line_serie.setPen(st)

        for i in range(0, len(df)):
            o_ = df.iloc[i, 2]
            h_ = df.iloc[i, 0]
            l_ = df.iloc[i, 1]
            c_ = df.iloc[i, 3]
            self._candlestick_serie.append(QtChart.QCandlestickSet(o_, h_, l_, c_, float(i)))
            self.dt_line_serie.append(qt[i], o_)
            self.int_line_serie.append(float(i), o_)

        self._chart.addSeries(self._candlestick_serie)
        self._chart.addSeries(self.dt_line_serie)
        self._chart.addSeries(self.int_line_serie)
        self._chart.legend().hide()

        self._chart_view.setChart(self._chart)

        axisX = QValueAxis()
        axisX.setLabelFormat("%d")
        self._chart.addAxis(axisX, Qt.AlignBottom)
        self._candlestick_serie.attachAxis(axisX)
        self.int_line_serie.attachAxis(axisX)

        axisX = QDateTimeAxis()
        axisX.setFormat("yyyy-MM-dd")
        self._chart.addAxis(axisX, Qt.AlignBottom)
        self.dt_line_serie.attachAxis(axisX)

        axisY = QValueAxis()
        self._chart.addAxis(axisY, Qt.AlignLeft)
        self._candlestick_serie.attachAxis(axisY)
        self.dt_line_serie.attachAxis(axisY)
        self.int_line_serie.attachAxis(axisY)


if __name__ == "__main__":
    import sys

    app = QtWidgets.QApplication(sys.argv)
    w = MainWindow()
    w.show()
    sys.exit(app.exec_())

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