[PHP知识库]QCustomPlot类的使用

1.QCustomPlot的使用需要在工程项目里面添加相应的源文件：

• QCustomPlot 官方下载地址:

  http://www.qcustomplot.com/index.php/download

• 将压缩包解压，将qcustomplot.cpp和qcustomplot.h文件添加入工程文件中

• 在工程的.pro文件中添加 QT += printsupport语句

2.实现样例—实时显示波形

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
{
    this->setFixedSize(400,400);
    QTimer *timer = new QTimer;

    cplot = new QCustomPlot(this);
    cplot->setGeometry(QRect(20, 100, 360, 250));
    cplot->addGraph();
    cplot->graph(0)->setName("Data1");
    cplot->graph(0)->setPen(QPen(Qt::blue));

    cplot->addGraph();
    cplot->graph(1)->setName("Data1");
    cplot->graph(1)->setPen(QPen(Qt::red));

    cplot->xAxis->setLabel("x");
    cplot->yAxis->setLabel("y");
    cplot->xAxis->setRange(0, 100);
    cplot->yAxis->setRange(0, 100);

    connect(timer, SIGNAL(timeout()), this, SLOT(OnSlotReplot()));
    timer->start(1000);

}

MainWindow::~MainWindow()
{

}

void MainWindow::OnSlotReplot(){
    QVector<double> x(100), y(100);
    QVector<double> x1(100), y1(100);
    for(int i=0; i < 100; i++){
        x[i] = i;
        y[i] = rand() % 40 + 40;

        x1[i] = i;
        y1[i] = rand() % 40;
    }
    cplot->graph(0)->setData(x,y);
    cplot->graph(1)->setData(x1,y1);
    cplot->replot();
}