When the dialog pops up, the chart series is drawn over the dialog.

Christian Ehrlicher

Without a minimal, compilable example we can't say if it's a bug in Qt or on your side. I would guess it's on your side.

IknowQT

@Christian-Ehrlicher

void wSpectrum::AddChartSeries(bool isData, usrTableModel* pModel)
{
	QLineSeries* pSeries = new QLineSeries(m_pChart);
	//pSeries->setUseOpenGL(true);							// 속도 향상

	QVXYModelMapper* mapper = new QVXYModelMapper(this);
	mapper->setXColumn(0);
	mapper->setYColumn(pModel->GetColCount()-1);
	
	if(isData)
		mapper->setSeries(pSeries);

	mapper->setModel(pModel);

	m_pChart->addSeries(pSeries); 
	m_pChart->createDefaultAxes();

	// [축 재설정] 
	{
		QValueAxis* axisx = qobject_cast<QValueAxis*>(m_pChart->axes(Qt::Horizontal).first());
		axisx->setTickCount(5);

		m_pChart->axisX()->setTitleFont(cGlobalParam::gGetChartAxis(true));
		m_pChart->axisX()->setTitleText("Wave Length");
		m_pChart->axisX()->setTitleBrush(QBrush(QColor(76, 127, 185)));		

		m_pChart->axisY()->setTitleFont(cGlobalParam::gGetChartAxis(true));
		m_pChart->axisY()->setTitleText("Absorbance.");
		m_pChart->axisY()->setTitleBrush(QBrush(QColor(76, 127, 185)));
	}

	// [행의 마지막 위치로 이동]
	QModelIndex index = pModel->index(0, pModel->GetColCount()-1, QModelIndex());
	this->ui.tableWidget->scrollTo(index, QAbstractItemView::PositionAtTop);
}

void wSpectrum::BtnMeasure()
{
	QPair<QString, QList<qreal>> pairTemp2;

    pairTemp2.first = QString("D_%1").arg(m_pDataModel->GetInputData().count());
	for (int i = 0; i < this->m_pSpectrumInfo->GetDataCount()+1; i++)
	{        
		qreal qRan1 = QRandomGenerator::global()->bounded(0, 10);
		qreal qRan2 = QRandomGenerator::global()->generateDouble();
		pairTemp2.second.append(qRan1 + qRan2);
	}
	m_pDataModel->AppendData(pairTemp2);

    AddChartSeries(true, m_pDataModel);	
	//this->update();
}

I am connecting tables and charts with Abstractmodel. It draws a series whenever data comes in, but the setUseOpenGL option seems to be the cause. Please understand that we cannot upload the full source.

IknowQT

@Christian-Ehrlicher

pSeries->setUseOpenGL(true); If I disable the function, it works fine.
The problem with this is that even if you delete all the series in the chart, it remains on the screen. But when I switch to another screen with the mouse, it is cleared.

This is a bug.

Christian Ehrlicher

If you can't provide a minimal, compilable example we can't help here. I doubt it's a bug in Qt but on your side. If you think it's a bug, write a bug report but even there you need a minimal, compilable examle to get your problem fixed...

IknowQT

@Christian-Ehrlicher

https://github.com/HaonPAPA/MyRepository/blob/main/linechart.7z

I have created an example. A dialog box pops up after creating a series by clicking the Add series button.
A blue widget is floating in the dialog. It is drawn over the widget.

Christian Ehrlicher

It's the combination of Qt::FramelessWindowHint and OpenGl. You should create a bug report with your testcase.

IknowQT

@Christian-Ehrlicher

Are you saying it's a bug?

Christian Ehrlicher

Yes - as I told you create a bug report, but why do you need such a dialog on top?

IknowQT

@Christian-Ehrlicher

I am trying to open an option window. However, as a form of style, I tried to lower the alpha value around it to draw more attention to the options window.

The method I have implemented may not be the normal method.
If there is a better way please suggest

Christian Ehrlicher

What's wrong with a simple QDialog?

IknowQT

@Christian-Ehrlicher

This is the UI I wanted.

Christian Ehrlicher

This is a simple QMessageBox. Why so much work? Why must it be frameless?

IknowQT

@Christian-Ehrlicher

The program we are developing is user UI-oriented, so we have to pay a lot of attention to the little things.

answer my question
What I want is to blur the background behind it. It could be done very simply in C# too.
Is there a better way than the way I did?

Christian Ehrlicher

I don't know - if you've a commercial license then ask TQtC to fix it. Otherwise find a workaround.