Qt画虚线

mainwindow.cpp

{
    QComboBox *comboBox_penStyle = new QComboBox;
    QStringList SL_penStyle;
    SL_penStyle << "______" << "----------" << ".........." << "-.-.-.-.-." << "-..-..-..-.." << "CustomDashLine";
    comboBox_penStyle->addItems(SL_penStyle);
    ui->mainToolBar->addWidget(comboBox_penStyle);
    connect(comboBox_penStyle, SIGNAL(currentIndexChanged(int)), this, SLOT(comboBox_penStyle_changed(int)));
}

void MainWindow::comboBox_penStyle_changed(int index)
{
    Qt::PenStyle ps = static_cast<Qt::PenStyle>(index + 1);
    imageWidget->pen.setStyle(ps);
}

CustomDashLine还没做