Create cursor #Qcustomplot

[Albator]

Hello all :)

I would like to create a cursor that could indicate the points of a curve with the click of a mouse, and also to be able to move the cursor over the curve, even if it is possible to enter a value and the cursor goes to that value.

I looked a bit at the QCPItemLine library (QCustomPlot *parentPlot) but I don't know if this is the right direction.

For now I just have this piece of code to plot my graph:

 ui->plot->addGraph();
    ui->plot->graph(0)->setData(batch[i],batch1[i]);
    // give the axes some labels:
    ui->plot->xAxis->setLabel("batch 0");
    ui->plot->yAxis->setLabel("batch 1");
    // set axes ranges, so we see all data:
    ui->plot->xAxis->setRange(0, *std::max_element(batch[i].constBegin(), batch[i].constEnd())+1);
    ui->plot->yAxis->setRange(0, *std::max_element(batch1[i].constBegin(), batch1[etag].constEnd())+1);
    ui->plot->replot();
    ui->plot->setInteractions(QCP::iRangeDrag | QCP::iRangeZoom );

if you have any advice or ideas, I'll take it!

good day to all :)

[Albator]

for a static cursor you can use this code :

 bool ok=true;

       tracer_test=new QCPItemTracer(ui->graph5);
    // generate some data:
       QVector<double> x(101), y(101); // initialize with entries 0..100
       double k=0.5;
       for (int i=0; i<101; ++i)
       {
         x[i] = i/50.0 - 1; // x goes from -1 to 1
         y[i] = x[i]*x[i]; // let's plot a quadratic function
       }
       // create graph and assign data to it:

       test_QCPGraph=ui->graph5->addGraph();
       test_QCPGraph->setData(x,y);
       test_QCPGraph->setPen(QPen(Qt::blue));
       test_QCPGraph->rescaleKeyAxis();

       //ui->graph5->addGraph();

       ui->graph5->graph(0)->addData(x,y);




       // give the axes some labels:
       ui->graph5->xAxis->setLabel("x");
       ui->graph5->yAxis->setLabel("y");
       // set axes ranges, so we see all data:
       ui->graph5->xAxis->setRange(-1, 1);
       ui->graph5->yAxis->setRange(0, 1);

       tracer_test->setGraph(test_QCPGraph);
       tracer_test->setGraphKey(k);
       tracer_test->setInterpolating(ok);
       tracer_test->setStyle(tracer_test->tsCircle);

       ui->graph5->replot();
       ui->graph5->setInteractions(QCP::iRangeDrag | QCP::iRangeZoom | QCP::iSelectPlottables );