updating Widget doesn't work

Hello

I created two windows: "PlotWindow" and "TableWindow"
Attachment 10615

When I click on the button "Show Plot" I expect to see a new graph:

Code:

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void PlotWindow::slotUpdatePlot(const QSqlTableModel &model)
{
    int rowCount = model.rowCount();
    QVector<double> x( rowCount ), y( rowCount ); // initialize with entries 0..100
 
    QSqlRecord record;
    for ( int row = 0; row < rowCount; ++row ) {
        record = model.record( row );
        x[row] = record.fieldName( 0 ).toDouble();
        y[row] = record.fieldName( 1 ).toDouble();
    }
 
    // create graph and assign data to it:
    ui->plotWidget->addGraph();
    ui->plotWidget->graph( 0 )->setData( x, y );
    // give the axes some labels:
    ui->plotWidget->xAxis->setLabel( "x" );
    ui->plotWidget->yAxis->setLabel( "y" );
    // set axes ranges, so we see all data:
    ui->plotWidget->xAxis->setRange( -1, 1 );
    ui->plotWidget->yAxis->setRange( 0, 1 );
 
    ui->plotWidget->update();
}

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How you can see below I wrote: ui->plotWidget->update();

But when I resize my PlotWindow I see the right result:
Attachment 10616

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Added after 7 minutes:

This is my source code: https://github.com/8Observer8/PlotAndTable

You should use:

Code:

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ui->plotWidget->replot();

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to update the plot immediately.

update() will not call the QCustomPlot's paint event until you resize/click etc.
HTH.

Thank you very much! It is excellent! :D