使用QCPDataSelection来设置选中的区域，并将QCPGraph的可选择区域设置成QCP::stMultipleDataRanges

void AreaPieces::initCustomPlot(QCustomPlot *parentPlot)
{QVector<double> x = {0, 1, 2, 3, 4, 5, 6, 7, 8};QVector<double> y = {200, 560, 750, 580, 250, 300, 450, 300, 100,};QVector<QString> labels = {"2019-10-10","2019-10-11","2019-10-12","2019-10-13","2019-10-14","2019-10-15","2019-10-16","2019-10-17","2019-10-18",};auto ticker = QSharedPointer<QCPAxisTickerText>::create();ticker->setTicks(x, labels);QCPDataSelection selection;selection.addDataRange(QCPDataRange(1, 4));selection.addDataRange(QCPDataRange(5, 8));QPen pen(QColor("#5470C6"), 5);auto graph = new QCPSmoothGraph(parentPlot->xAxis, parentPlot->yAxis);parentPlot->graph()->setData(x, y);parentPlot->graph()->setPen(pen);parentPlot->graph()->selectionDecorator()->setBrush(QColor(0, 0, 180, 102));parentPlot->graph()->selectionDecorator()->setPen(pen);parentPlot->graph()->setSelectable(QCP::stMultipleDataRanges);parentPlot->graph()->setSelection(selection);parentPlot->xAxis->setTicker(ticker);parentPlot->xAxis->grid()->setVisible(false);parentPlot->yAxis->setRange(0, 1000);parentPlot->xAxis->setRange(0, 8);
}