头文件包含

本样例下载地址：https://download.csdn.net/download/birenxiaofeigg/11244404

#include <QChartView>
#include <QtCharts/QChartView>
#include <QtCharts/QValueAxis>
#include <QtCharts/QSplineSeries>

#include <QVector>
#include <QTimer>
#include <QHBoxLayout>

新建QChartView类并作初始化

void chartTest::iniChart()
{
    mChart = new QChartView();
    mChart->setEnabled(true);
    mChart->chart()->setTitle("Kv-Vacuum");
    mChart->chart()->legend()->hide();
    mChart->chart()->setTheme(QtCharts::QChart::ChartTheme::ChartThemeDark);

    vaX = new QValueAxis();
    vaY1 = new QValueAxis();
    vaY2 = new QValueAxis();

    spY1 = new QSplineSeries();
    spY2 = new QSplineSeries();

    //vecKv = new QVector<QPointF>;
    //vecVacc = new QVector<QPointF>;

    vaX->setRange(0, MaxSample);
    vaX->setTickCount(7);
    vaX->setLabelsColor(QColor(0, 255, 0));
    vaX->setTitleText("Sample-Points");

    vaY1->setRange(0, 200);
    vaY1->setTickCount(6);
    vaY1->setLabelsColor(QColor(255,0, 0));
    vaY1->setTitleText("Voltage-Kv");

    vaY2->setRange(0, 10);
    vaY2->setTickCount(6);
    vaY2->setLabelsColor(QColor(0, 0, 255));
    vaY2->setTitleText("Penning-V");

    mChart->chart()->addAxis(vaX, Qt::AlignBottom);
    mChart->chart()->addAxis(vaY1, Qt::AlignLeft);
    mChart->chart()->addAxis(vaY2, Qt::AlignRight);
    mChart->chart()->addSeries(spY1);
    mChart->chart()->addSeries(spY2);


    spY1->attachAxis(vaX);
    spY1->attachAxis(vaY1);
    spY1->setColor(QColor(255, 0, 0));
    spY1->setUseOpenGL();// 开启openGL加速

    spY2->attachAxis(vaX);
    spY2->attachAxis(vaY2);
    spY2->setColor(QColor(0, 0, 255));
    spY2->setUseOpenGL();

    QHBoxLayout* hlay = new QHBoxLayout();
    hlay->addWidget(mChart);
    this->setLayout(hlay);

    QTimer* timer1 = new QTimer(this);
    timer1->setInterval(15);
    connect(timer1, SIGNAL(timeout()), this, SLOT(timer1Slot()));
    timer1->start();
}

定时器处理，数据刷新

void chartTest::timer1Slot()
{
    static int cnt = 0;
    if (cnt <= MaxSample)
    {
        float tmp = 85.0 + 85 * sin(cnt * 4 * PI / MaxSample);
        vecKv.push_back(QPointF(cnt, tmp));
        tmp = 5 + 5 * cos(cnt * 4 * PI / MaxSample);
        vecVacc.push_back(QPointF(cnt, tmp));
    }
    else
    {
        for (int i = 1; i < MaxSample; ++i)
        {
            vecKv[i - 1] = QPointF(vecKv[i - 1].x(), vecKv[i].y());
            vecVacc[i - 1] = QPointF(vecVacc[i - 1].x(), vecVacc[i].y());
        }
        float tmp = 85.0 + 85 * sin(cnt * 4 * PI / MaxSample);
        vecKv[MaxSample-1] = QPointF(vecKv[MaxSample-1].x(), tmp);
        tmp = 5 + 5 * cos(cnt * 4 * PI / MaxSample);
        vecVacc[MaxSample-1] = QPointF(vecVacc[MaxSample-1].x(), tmp);

        if (cnt >= 3 * MaxSample)// 计数器复位
        {
            cnt = 0;
            vecKv.clear();
            vecVacc.clear();
        }
    }
    cnt++;

    spY1->replace(vecKv);
    spY2->replace(vecVacc);
}

图像显示

从0开始刷新

覆盖旧数据刷新

本样例下载地址：https://download.csdn.net/download/birenxiaofeigg/11244404