Qcustomplot notes (I): qcustomplot adding data and curves

One . Preface
The landlord is studying recently QCustomplot Related content , So I want to record what I have learned , At the same time, it is also shared with those in need
The landlord is not involved in deep , It may not be right , No joy, no spray. . thank you

Two . The process
1. Drag one QWidget, Prompt for QCustomplot

2. Write code

    //  Data structure 
    QVector<double> x,y;
    for(double xi=-2*M_PI;xi<2*M_PI;xi+=0.1)
    {
    
        x.push_back(xi);
        y.push_back(sin(xi));
    }

    // Add curves , This sentence must be added , Otherwise, the curve will not be displayed 
    ui->widget->addGraph();

    //  Set up x Axis and y The name of the shaft 
    ui->widget->xAxis->setLabel(" This is a X Axis ");
    ui->widget->yAxis->setLabel(" This is a Y Axis ");

    //  Set up the data 
    ui->widget->graph(0)->setData(x,y);

    //  Set curve name 
    ui->widget->graph(0)->setName("y=sin(x)");

    //  Set the display curve name 
    ui->widget->legend->setVisible(true);

    //  Set the font attribute of curve name 
    ui->widget->legend->setFont(QFont(" Microsoft YaHei ",13));

    //  Set adaption 
     ui->widget->rescaleAxes(true);

3. Add multiple groups of data , Adding multiple groups of data is the same as adding a single group of data , I think it's very convenient to add this ,QCustomplot The author of is really a great man

//  Data structure 
    QVector<double> x,y;
    for(double xi=-2*M_PI;xi<2*M_PI;xi+=0.1)
    {
    
        x.push_back(xi);
        y.push_back(sin(xi));
    }

    // Add curves , This sentence must be added , Otherwise, the curve will not be displayed 
    ui->widget->addGraph();

    //  Set up x Axis and y The name of the shaft 
    ui->widget->xAxis->setLabel(" This is a X Axis ");
    ui->widget->yAxis->setLabel(" This is a Y Axis ");

    //  Set up the data 
    ui->widget->graph(0)->setData(x,y);

    //  Set curve name 
    ui->widget->graph(0)->setName("y=sin(x)");

    //  Set the display curve name 
    ui->widget->legend->setVisible(true);

    //  Set the font attribute of curve name 
    ui->widget->legend->setFont(QFont(" Microsoft YaHei ",13));

    //  Set adaption 


    QVector<double> x1,y1;
    for(double xx=-2*M_PI;xx<2*M_PI;xx+=0.1)
    {
    
        x1.push_back(xx);
        y1.push_back(cos(xx));
    }

    //
    QPen pen;
    pen.setWidth(3);
    pen.setColor(Qt::green);

    ui->widget->addGraph();
    //  Set the curve color 
    ui->widget->graph(1)->setPen(pen);

    ui->widget->graph(1)->setData(x1,y1);
    ui->widget->graph(1)->setName("y=cos(x)");
    ui->widget->rescaleAxes(true);

    //
    QPen pen3;
    pen3.setWidth(3);
    pen3.setColor(Qt::yellow);
    ui->widget->addGraph();
    QVector<double> x2,y2;
    for(int i=0;i<10;i++)
    {
    
        x2.push_back(i);
        y2.push_back(i);
    }
    ui->widget->graph(2)->setPen(pen3);
    ui->widget->graph(2)->setData(x2,y2);
    ui->widget->graph(2)->setName("y=x");


    //  When adding multiple groups of data , This sentence must be placed at the end , To realize the self adaptation of the coordinate axis 
    ui->widget->rescaleAxes(true);