修改QLineSeries上点的样式

要修改 QLineSeries 上点的样式，可以使用 QScatterSeries 类。可以先将 QLineSeries 和 QScatterSeries 绑定在一起，然后再修改 QScatterSeries 上的点的样式。以下是一个修改 QLineSeries 上点的样式的示例代码：

import sys
from PyQt5.QtWidgets import QApplication, QMainWindow
from PyQt5.QtChart import QChart, QChartView, QLineSeries, QScatterSeries, QSplineSeries
from PyQt5.QtGui import QPainter
from PyQt5.QtCore import Qt

class MainWindow(QMainWindow):
    def __init__(self):
        super().__init__()

        # 创建 QChart 对象和 QChartView 对象
        chart = QChart()
        chart_view = QChartView(chart, self)

        # 创建 QLineSeries 对象和 QScatterSeries 对象
        line_series = QLineSeries()
        scatter_series = QScatterSeries()

        # 将 QScatterSeries 绑定到 QLineSeries 上
        line_series.setPointsVisible(True)
        line_series.setPointLabelsVisible(True)
        line_series.setPointLabelsFormat("@yPoint")
        line_series.setPointLabelsColor(Qt.red)
        line_series.setPointLabelsFont(QFont("Arial", 10))
        line_series.setPen(QPen(Qt.red))
        line_series.setName("Line Series")
        chart.addSeries(line_series)

        scatter_series.setMarkerShape(QScatterSeries.MarkerShapeCircle)
        scatter_series.setMarkerSize(10.0)
        scatter_series.setColor(Qt.red)
        scatter_series.setBrush(Qt.red)
        scatter_series.setOpacity(0.7)
        scatter_series.setName("Scatter Series")
        chart.addSeries(scatter_series)

        # 创建坐标轴
        axis_x = QDateTimeAxis()
        axis_x.setTickCount(10)
        axis_x.setFormat("MM-dd")
        axis_x.setTitleText("日期")
        chart.addAxis(axis_x, Qt.AlignBottom)

        axis_y = QValueAxis()
        axis_y.setLabelFormat("%.2f")
        axis_y.setTitleText("数值")
        chart.addAxis(axis_y, Qt.AlignLeft)

        line_series.attachAxis(axis_x)
        line_series.attachAxis(axis_y)

        scatter_series.attachAxis(axis_x)
        scatter_series.attachAxis(axis_y)

        chart.setTitle("Line Series and Scatter Series")
        chart.legend().setVisible(True)
        chart.legend().setAlignment(Qt.AlignBottom)

        chart_view.setRenderHint(QPainter.Antialiasing)
        self.setCentralWidget(chart_view)

        # 修改 QScatterSeries 上点的样式
        scatter_series.setPen(QPen(Qt.blue))
        scatter_series.setBrush(Qt.blue)
        scatter_series.setMarkerShape(QScatterSeries.MarkerShapeRectangle)
        scatter_series.setMarkerSize(15.0)

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

在上述示例代码中，我们创建了一个 QLineSeries 对象和一个 QScatterSeries 对象，并将它们绑定在一起。然后，我们修改了 QScatterSeries 上点的样式，包括线条颜色、填充颜色、标记形状和标记大小等。最后，我们将 QScatterSeries 添加到 QChart 中并显示出来。