CODEWITHSUNDEEP
c++qtqcustomplot
zar
zar

Reputation: 12227

QCustomPlot/Widget doesn't show graph/update

I am using QSplitter where the right pane is QCustomPlot which shows a graph when I click in the left pane (a tree view). The problem is the graph doesn't show up or updates until I resize the splitter. I am using Qt example code:

void MyDialog::setupPlot(QCustomPlot *customPlot)
{
    QString demoName = "Quadratic Demo";
    // generate some data:
    QVector<double> x(101), y(101); // initialize with entries 0..100
    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:
    customPlot->addGraph();
    customPlot->graph(0)->setData(x, y);
    // give the axes some labels:
    customPlot->xAxis->setLabel("x");
    customPlot->yAxis->setLabel("y");
    // set axes ranges, so we see all data:
    customPlot->xAxis->setRange(-1, 1);
    customPlot->yAxis->setRange(0, 1);
}

The plot of course shows up when I call this function in the constructor (like it is in the example) but not if call this in button clicked.

What do I need to do to make sure the graph is plotted when I call this function?

Upvotes: 3

Views: 2931

Answers (1)

Nejat
Nejat

Reputation: 32635

You should use replot() function to update the plot :

customPlot->replot();

It causes a complete replot into the internal buffer. This method must be called when you make changes on the axis ranges or data points of graphs. This makes the changes visible.

Upvotes: 3

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