Crash when dynamically add line series to QChart after setMarkerShape(QLegend::MarkerShapeFromSeries)

diverger

I am using QCharts to show several XY line series. Among the series, there are several fixed, and others need to be added later, and dynamically. So the code runs as below:

chartViewWidget->chart()->addSeries(s1);
chartViewWidget->chart()->addSeries(s2);
chartViewWidget->chart()->createDefaultAxes();	
chartViewWidget->chart()->legend()->setAlignment(Qt::AlignRight);
chartViewWidget->chart()->legend()->setMarkerShape(QLegend::MarkerShapeFromSeries);

// some other code
// ........

chartViewWidget->chart()->addSeries(s3);

When adding s3, the program crashed. When I comment out the line contains "setMarkerShape(QLegend::MarkerShapeFromSeries)", all works well.

Because s1 and s2 is fixed, I don't want to remove all series, then re-add s1 and s2 every time when I adding s3. So, any suggestions?

Thanks.

BTW:

My tool chain is: Win7 64bit + Qt 5.10.1_32bit + Qt VS Tools + VS2015.

VRonin

I can't try myself at the moment.
Can you reproduce even with this minimal example?

#include <QApplication>
#include <QChart>
#include <QChartView>
#include <QXYSeries>
#include <QPointF>
#include <QLegend>
int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    QChartView mainView;
    QChart* mainChart = new QChart(&mainView);
    mainView->setChart(mainChart);
    QXYSeries* s1 = new QXYSeries({QPointF(0.0,0.0),QPointF(1.0,1.0),QPointF(2.0,2.0)});
    QXYSeries* s2 = new QXYSeries({QPointF(0.0,2.0),QPointF(1.0,1.0),QPointF(2.0,0.0)});
    QXYSeries* s3 = new QXYSeries({QPointF(0.0,0.5),QPointF(1.0,1.5),QPointF(2.0,0.5)});
    mainChart->addSeries(s1);
    mainChart->addSeries(s2);
    mainChart->createDefaultAxes();
    mainChart->legend()->setAlignment(Qt::AlignRight);
    mainChart->setMarkerShape(QLegend::MarkerShapeFromSeries);
    mainChart->addSeries(s3);
    mainView.show();
    return a.exec();
}

diverger

@VRonin I did some minor reviews to your code, and made it compiled, the changed code is as below:

#include <QApplication>
#include <QtCharts/QChartView>
#include <QtCharts/QChart>
#include <QtCharts/QLineSeries>
#include <QtCharts/QValueAxis>
#include <QtCharts/QLegendMarker>
#include <QtCharts/QXYSeries>
#include <QPointF>
#include <QtCharts/QLegend>
QT_CHARTS_USE_NAMESPACE

int main(int argc, char *argv[])
{
	QApplication a(argc, argv);
	QChartView *mainView = new QChartView();
	QChart* mainChart = new QChart();
	mainView->setChart(mainChart);
	QLineSeries* s1 = new QLineSeries();
	s1->append({ QPointF(0.0,0.0),QPointF(1.0,1.0),QPointF(2.0,2.0) });
	QLineSeries* s2 = new QLineSeries();
	s2->append({ QPointF(0.0,2.0),QPointF(1.0,1.0),QPointF(2.0,0.0) });
	QLineSeries* s3 = new QLineSeries();
	s3->append({ QPointF(0.0,0.5),QPointF(1.0,1.5),QPointF(2.0,0.5) });
	mainChart->addSeries(s1);
	mainChart->addSeries(s2);
	mainChart->createDefaultAxes();
	mainChart->legend()->setAlignment(Qt::AlignRight);
	//mainChart->legend()->setMarkerShape(QLegend::MarkerShapeFromSeries);
	mainChart->addSeries(s3);
	mainView->show();
	return a.exec();
}

I must comment out that line too, to make the code run well, or it will crash.

VRonin

Ok, then it's probably a bug. Report it on https://bugreports.qt.io including the below example, the OS, compiler and Qt version