Question

我正在开发一个在主窗口中显示3个图表的应用程序，并且一切正常。但是现在在创建实例时遇到错误应用程序崩溃的另一个窗口的类内的主窗口，调试器何时显示其中一个图表中触发的异常。

我使用了图形视图并将其升级为Qchartview，对于每个图表，代码如下：

图表_1

QPieSlice *slice = pieSeries->slices().at(0);
   QFont font = slice->labelFont() ;
        font.setBold(true);
        font.setPointSize(15);

        slice->setExploded();
        slice->setLabelVisible();
        slice->setPen(QPen(Qt::darkGreen, 1));
        slice->setBrush(Qt::darkBlue);
        slice->setLabelFont(font);

        QChart *chart = new QChart();
        chart->addSeries(pieSeries);
        chart->setTitle("<h2>Total money of each currency</h2>");
        chart->setAnimationOptions(QChart::SeriesAnimations);
        chart->legend()->setVisible(true);
        chart->legend()->setAlignment(Qt::AlignBottom);

        pieSeries->setLabelsVisible();
        pieSeries->setLabelsPosition(QPieSlice::LabelOutside);

        for(auto slice : pieSeries->slices())
        slice->setLabel(QString("%1%").arg(100*slice->percentage(), 0, 'f', 1));

        ui->chartView_1->setChart(chart);
        ui->chartView_1->setRenderHint(QPainter::Antialiasing);

图表_2

QChart *donutBreakdown = new QChart();
        donutBreakdown->setAnimationOptions(QChart::AllAnimations);
        donutBreakdown->setTitle("<h2>Cassettes Information</h2>");
        donutBreakdown->legend()->setAlignment(Qt::AlignBottom);
        donutBreakdown->addSeries(series1);
        donutBreakdown->addSeries(pieSeriesPie2);
        donutBreakdown->addSeries(series3);

        pieSeriesPie2->setLabelsVisible();
        pieSeriesPie2->setLabelsPosition(QPieSlice::LabelOutside);

        double arm = 0.04;
        for(int i = 0; i < pieSeriesPie2->count(); i++){
            double arm = (double)i/24;
           double arm2= i*0.040;

                QPieSlice *slice1 = pieSeriesPie2->slices().at(i);
                slice1->setLabelArmLengthFactor(arm2);

        }
        ui->chartView_2->setChart(donutBreakdown);
        ui->chartView_2->setRenderHint(QPainter::Antialiasing);

这两个图表是饼图，并且触发的异常在chart_2上我已经替换了chart_2，已经替换了我在表单中使用的图形视图

我正在努力解决此错误的日子。请帮助我

Answer 1

您的static_cast

m_slice = static_cast<CustomSlice *>(slice1);

可能无法正常工作。我猜您是自己制作了CustomSlice类，该类继承了QPieChart。请查看https://en.cppreference.com/w/cpp/language/static_cast。你是说dynamic_cast吗？注释掉这些行，然后尝试重现该错误。

Qchart异常触发

1 个答案: