如何在自定义绘图QT C++中显示所有x轴值

#include <QtWidgets>

class CustomPlotWidget : public QWidget {
public:
    CustomPlotWidget(QWidget *parent = nullptr) : QWidget(parent) {}

protected:
    void paintEvent(QPaintEvent *event) override {
        Q_UNUSED(event);

        QPainter painter(this);
        painter.setRenderHint(QPainter::Antialiasing, true);

        // 绘制坐标轴
        painter.drawLine(50, height() - 50, width() - 50, height() - 50); // x轴
        painter.drawLine(50, height() - 50, 50, 50); // y轴

        // 模拟数据点
        QVector<QPointF> dataPoints;
        dataPoints << QPointF(0, 10) << QPointF(1, 20) << QPointF(2, 30) << QPointF(3, 40) << QPointF(4, 50);

        // 计算每个x轴值在绘图区域中的横坐标，并绘制
        for (const QPointF &point : dataPoints) {
            qreal x = 50 + (point.x() / 4) * (width() - 100); // 将x轴范围[0, 4]映射到绘图区域的宽度上
            qreal y = height() - 50 - (point.y() / 50) * (height() - 100); // 将y轴范围[0, 50]映射到绘图区域的高度上

            painter.drawEllipse(QPointF(x, y), 5, 5); // 绘制数据点
        }
    }
};

int main(int argc, char *argv[]) {
    QApplication app(argc, argv);

    CustomPlotWidget widget;
    widget.resize(500, 300);
    widget.show();

    return app.exec();
}