QT QChartView displays coordinate values

There are two ways to achieve this:

1. Rewrite the QChartView class

.h file

#ifndef QCHARTVIEW_T_H
#define QCHARTVIEW_T_H

#include <QObject>
#include <QtCharts/QChartView>
#include <QChartView>
#include <QMouseEvent>

QT_CHARTS_USE_NAMESPACE

class QChartView_t : public QChartView
{
    Q_OBJECT
public:
    //explicit QChartView_t(QWidget *parent = Q_NULLPTR);
    explicit QChartView_t(QChart *chart, QWidget *parent = Q_NULLPTR);

    void mouseMoveEvent(QMouseEvent *e);
signals:

public slots:
};

#endif // QCHARTVIEW_T_H

.cpp file

#include "qchartview_t.h"

#include <QtCharts/QChartView>
#include <QChartView>
#include <QDebug>

QT_CHARTS_USE_NAMESPACE

QChartView_t::QChartView_t(QChart *chart, QWidget *parent)
{
    this->setChart(chart);
}

void QChartView_t::mouseMoveEvent(QMouseEvent *e)
{

    //打印鼠标位置处的点的坐标值
    qDebug()<< this->chart()->mapToValue(e->pos());//把鼠标坐标值转化为画出的图中的坐标
    //以防父类的实例接收不到mouseMoveEvent事件。
    QChartView::mouseMoveEvent(e);//调用父类的重写方法。本行程序不同于e->ignore()，ignor是把事件继续向父控件（一般其父控件就是ui界面）传递，而不是向父类传递

}

2. Connect the mouse signal

.cpp file

QSplineSeries *series = new QSplineSeries();
    series->setName("spline");

    connect(series,&QSplineSeries::clicked,this,&ShowWidget::on_ClickSeries);

    for(int i=0;i<numOfStep;i++)
    {
        *series<<QPointF(currVol.RedVoltage, LXY.Value_Lv);
    }

    //series->setPointLabelsVisible();//显示输入点坐标

    QValueAxis * axisY = new QValueAxis();
    axisY->setRange(0,1200);
    axisY->setTickCount(10);

    chart = new QChart();
    chart->legend()->hide();
    chart->addSeries(series);
    //chart->setTitle("Simple spline chart example");

    chart->createDefaultAxes();
    chart->axisX()->setRange(voltageRange.iVoltageMin, voltageRange.iVoltageMax);
    chart->setAxisY(axisY,series);

    QChartView *chartView = new QChartView(chart);
    chartView->setRenderHint(QPainter::Antialiasing);

    QGridLayout *baseLayout = new QGridLayout();
    baseLayout->addWidget(chartView, 0, 0);
    ui->widget->setLayout(baseLayout);

QT QChartView displays coordinate values

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