效果

dialog.h

#ifndef DIALOG_H
#define DIALOG_H

#include <QDialog>
#include <QtCharts>
#include <QLineSeries>
#include <QGraphicsScene>
#include <QTimer>
#include <QSplineSeries>
#include <QPen>
QT_BEGIN_NAMESPACE
namespace Ui { class Dialog; }
QT_END_NAMESPACE

class Dialog : public QDialog
{
    Q_OBJECT

public:
    Dialog(QWidget *parent = nullptr);
    ~Dialog();

private:
    Ui::Dialog *ui;


private slots:
    /**
     * @brief 鼠标悬浮消息，进入序列1
     * @param point 悬浮时的坐标
     * @param state true:悬浮进入，false：悬浮退出
     * @return void
     */
     void slot_serieshovered1(const QPointF &point, bool state);
     void slot_serieshovered2(const QPointF &point, bool state);
private:
    /**
     * @brief 获取数据，内部模拟生产变化数据
     * @param[in]x X坐标
     * @return x对应的数据
     */
    qreal getData_1(qreal x);
    qreal getData_2(qreal x);
    /**
     * @brief 设置样式
     *
     */
    void changeStyle();

    /**
     * @brief 设置窗体调色板
     *
     */
    void setDialogPalette();

public:
    QChart* m_chart;//构建图表对象
    QSplineSeries* m_splineSerise1;
    QSplineSeries* m_splineSerise2;
    QGraphicsScene* m_pScene;
    QTimer* m_timer;//定时器
    QValueAxis* m_axisX;//X坐标轴
    QValueAxis* m_axisY;//Y坐标轴
    QPen m_penSeries1;  //系列1画笔
    QPen m_penSeries2;  //系列2画笔



};
#endif // DIALOG_H

dialog.cpp

#include "dialog.h"
#include "ui_dialog.h"
#include <QString>

const quint32 c_MaxSize=1000;//数据个数

Dialog::Dialog(QWidget *parent)
    : QDialog(parent)
    , ui(new Ui::Dialog)
    ,m_splineSerise1(NULL)
    ,m_splineSerise2(NULL)
{
    ui->setupUi(this);


    //setWindowFlags(Qt::FramelessWindowHint);

    //构建各个系列的画笔
    m_penSeries1 =QPen(Qt::green,2.f);
    m_penSeries2 =QPen(Qt::cyan,2.f);


    //构建曲线系列
    m_splineSerise1=new QSplineSeries(this);
    m_splineSerise2=new QSplineSeries(this);

    //为折线添加数据,曲线一
    qint32 i=0;
    qreal x=0.f;
    for (i=0;i<c_MaxSize;i++)
    {
        x=i*1.f/c_MaxSize;
        m_splineSerise1->append(i,getData_1(x));
    }

     //为折线添加数据,曲线二
    for ( i=0;i<c_MaxSize;i++)
    {
        x=i*1.f/c_MaxSize;
        m_splineSerise2->append(i,getData_2(x));
    }

    //构建图标对象
    m_chart=new QChart();

    //注意：先添加到图表再创建坐标轴,否则无效




    //构建坐标轴
    m_axisX = new QValueAxis();
    m_axisX->setRange(0,c_MaxSize);
    m_axisX->setTitleText(QString::fromLocal8Bit("Time"));//设置标题
    m_axisX->setLabelFormat("%g");//设置格式
    m_axisX->setTickCount(5);//设置刻度数

    m_axisY= new QValueAxis();
    m_axisY->setRange(-10,10);
    m_axisY->setTitleText(QString::fromLocal8Bit("T"));

    //将坐标轴绑定
    m_chart->setAxisX(m_axisX,m_splineSerise1);
    m_chart->setAxisY(m_axisY,m_splineSerise1);

    m_chart->setAxisX(m_axisX,m_splineSerise2);
    m_chart->setAxisY(m_axisY,m_splineSerise2);

     //隐藏图例
     m_chart->legend()->hide();



    //设置图标主题
    m_chart->setTheme(QtCharts::QChart::ChartThemeBlueCerulean);
    //设置标题
    m_chart->setTitle(QString("图表1"));
    //设置尺寸
    m_chart->setGeometry(0,0,500,300);


    //构建场景
    m_pScene =new QGraphicsScene(this);

    //为视图构建场景
    ui->graphicsView->setScene(m_pScene);

    //将图表添加到场景
    m_pScene->addItem(m_chart);

    //设置抗锯齿
    ui->graphicsView->setRenderHint(QPainter::Antialiasing,true);

    //设置样式
    changeStyle();

    //1.将折线系列添加到图表
    m_chart->addSeries(m_splineSerise1);
    m_chart->addSeries(m_splineSerise2);

    //绑定鼠标悬浮的信号
    connect(m_splineSerise1,&QSplineSeries::hovered,this,&Dialog::slot_serieshovered1);
    connect(m_splineSerise2,&QSplineSeries::hovered,this,&Dialog::slot_serieshovered2);


}

Dialog::~Dialog()
{
    delete ui;
}

void Dialog::slot_serieshovered1(const QPointF &point, bool state)
{
    QPen penHighlight(Qt::white,5.f);
    if(state)//悬浮进入
    {
        m_splineSerise1->setPen(penHighlight);
    }
    else
    {
        m_splineSerise1->setPen(m_penSeries1);
    }
}

void Dialog::slot_serieshovered2(const QPointF &point, bool state)
{
    QPen penHighlight(Qt::white,5.f);
    if(state)//悬浮进入
    {
        m_splineSerise2->setPen(penHighlight);
    }
    else
    {
        m_splineSerise2->setPen(m_penSeries2);
    }
}

qreal Dialog::getData_1(qreal x)
{
    return qSin(x*2*M_PI)*7;//正弦
}

qreal Dialog::getData_2(qreal x)
{
    return qCos(x*2*M_PI)*7;//余弦
}

void Dialog::changeStyle()
{

    /**
     * 修改窗体
     *
     */
    //根据图表的主题设置调色板
    setDialogPalette();

    /**
     * 修改图表
     *
     */
    m_chart->setBackgroundVisible(true);
    //m_chart->setBackgroundBrush(Qt::transparent);//设置为透明
    m_chart->setBackgroundBrush(Qt::lightGray);

     QPen penBackground;
     penBackground.setStyle(Qt::DotLine);
     penBackground.setColor(Qt::green);
     m_chart->setBackgroundPen(penBackground);
    /**
     * 修改绘图区
     *
     */
    m_chart->setPlotAreaBackgroundVisible(true);
    m_chart->setPlotAreaBackgroundBrush(Qt::gray);



    /**
     * 修改标题
     *
     */

    QFont fontTitle;
    fontTitle.setFamily(QString::fromLocal8Bit("华文琥珀"));
    fontTitle.setPointSizeF(20.f);
    m_chart->setTitleFont(fontTitle);
    //设置字色
    m_chart->setTitleBrush(Qt::black);


    /**
     * 修改刻度
     *
     */

    //设置刻度
    QFont fontAxis;
    fontAxis.setFamily(QString::fromLocal8Bit("微软雅黑"));
    fontAxis.setPointSizeF(12.f);
    m_axisX->setTitleFont(fontAxis);
    m_axisY->setTitleFont(fontAxis);
    //设置字色
    m_axisX->setTitleBrush(Qt::darkMagenta);
    m_axisY->setTitleBrush(Qt::darkMagenta);

    //设否显示刻度线
    m_axisX->setGridLineVisible(true);
    m_axisY->setGridLineVisible(true);
    //设置字体坐标轴

    QFont fontLabel;
    fontLabel.setFamily(QStringLiteral("微软雅黑"));
    fontLabel.setPixelSize(12);
    m_axisX->setLabelsFont(fontLabel);
    m_axisY->setLabelsFont(fontLabel);

    /**
     * 修改图例
     *
     */
    //对齐方式
    m_chart->legend()->setAlignment(Qt::AlignLeft);

    /**
     * 系列
     *
     */


    m_splineSerise1->setPen(m_penSeries1);

    QPen pn2(Qt::cyan,2.f);
    m_splineSerise2->setPen(m_penSeries2);

    /**
     * 开启动画
     *
     */

    QChart::AnimationOptions aniOptions=QChart::AllAnimations;
    //m_chart->setAnimationOptions(aniOptions);

}

void Dialog::setDialogPalette()
{
    QChart::ChartTheme theme=QChart::ChartThemeBlueIcy;
    m_chart->setTheme(theme);
    //根据选定的主题确定Dialog的调色板
    QPalette pal=window()->palette();
    switch (theme)
    {
       case QtCharts::QChart::ChartThemeLight:
        pal.setColor(QPalette::Window,QRgb(0xf0f0f0));
        pal.setColor(QPalette::WindowText,QRgb(0x404040));
        break;
    case QtCharts::QChart::ChartThemeBlueCerulean:
        pal.setColor(QPalette::Window,QRgb(0x121218));
        pal.setColor(QPalette::WindowText,QRgb(0x6d6d6));
        break;
    case QtCharts::QChart::ChartThemeDark:
        pal.setColor(QPalette::Window,QRgb(0xf0f0f0));
        pal.setColor(QPalette::WindowText,QRgb(0x404040));
        break;
    case QtCharts::QChart::ChartThemeBrownSand:
        pal.setColor(QPalette::Window,QRgb(0xf0f0f0));
        pal.setColor(QPalette::WindowText,QRgb(0x404040));
        break;
    case QtCharts::QChart::ChartThemeBlueNcs:
        pal.setColor(QPalette::Window,QRgb(0xf0f0f0));
        pal.setColor(QPalette::WindowText,QRgb(0x404040));
        break;
    case QtCharts::QChart::ChartThemeHighContrast:
        pal.setColor(QPalette::Window,QRgb(0xf0f0f0));
        pal.setColor(QPalette::WindowText,QRgb(0x404040));
        break;
    case QtCharts::QChart::ChartThemeBlueIcy:
        pal.setColor(QPalette::Window,QRgb(0xf0f0f0));
        pal.setColor(QPalette::WindowText,QRgb(0x404040));
        break;
    case QtCharts::QChart::ChartThemeQt:
        pal.setColor(QPalette::Window,QRgb(0xf0f0f0));
        pal.setColor(QPalette::WindowText,QRgb(0x404040));
        break;
    default:
        pal.setColor(QPalette::Window,QRgb(0xf0f0f0));
        pal.setColor(QPalette::WindowText,QRgb(0x404040));
        break;
    }
    window()->setPalette(pal);
}

悬浮槽函数

void Dialog::slot_serieshovered1(const QPointF &point, bool state)
{
    QPen penHighlight(Qt::white,5.f);
    if(state)//悬浮进入
    {
        m_splineSerise1->setPen(penHighlight);
    }
    else
    {
        m_splineSerise1->setPen(m_penSeries1);
    }
}

void Dialog::slot_serieshovered2(const QPointF &point, bool state)
{
    QPen penHighlight(Qt::white,5.f);
    if(state)//悬浮进入
    {
        m_splineSerise2->setPen(penHighlight);
    }
    else
    {
        m_splineSerise2->setPen(m_penSeries2);
    }
}