Markers are not removed from QwtPlot

[MuzZviman]

Hello,
I'm writing an application that uses Qwt 5.2.1 and uses QwtPlot in a QGraphicsView widget. I have a QwtPlotCurve and 1 or two QwtPlotMarker as horizontal lines. I'm trying to add vertical markers as an array of QwtPlotMarker. The first time I add them it works OK:
1..jpg
When I select new points for the markers, I would like remove the old ones but they remain on the plot:
2..jpg
here is the code:
//////// Draw Vertical Markers
void ThresholdDataPlot:rawXMarkers(QList<double> *l)
{
double y;
MarkersX = l;
nXMarkers = MarkersX->count();
VMarks = new QwtPlotMarker *[nXMarkers];

QPen p(Qt::blue);

for(int i = 0; i < nXMarkers; i++)
{
VMarks[i] = new QwtPlotMarker();
VMarks[i]->setLinePen(p);
VMarks[i]->setLineStyle(QwtPlotMarker::VLine);
y = MarkersX->at(i);
VMarks[i]->setXValue(y);
VMarks[i]->attach(this);
}

replot();
}


void ThresholdDataPlot::CleanXMarkers()
{
if(VMarks == NULL) return;

for(int i = 0; i < nXMarkers; i++)
{
VMarks[i]->hide();
VMarks[i]->detach();
delete VMarks[i];
}
delete [] VMarks;

VMarks = NULL;
replot();
}

Any ideas?

Thanks,

Muz

[gutiory]

Hello.

I've one example in which there is one checkbox that shows the markers if you check it and hide them if you uncheck it. The function i have is the next:

void CWGraficaSimple::on_chkMostrarEventos_stateChanged(int state)
{
 
	QVectorIterator<QwtPlotMarker*> itMarcas(vMarcas);
 
	while(itMarcas.hasNext())
		itMarcas.next()->setVisible(state);
	qwtPlot->replot();
 
}

void CWGraficaSimple::on_chkMostrarEventos_stateChanged(int state)
{
	
	QVectorIterator<QwtPlotMarker*> itMarcas(vMarcas);
	
	while(itMarcas.hasNext())
		itMarcas.next()->setVisible(state);
	qwtPlot->replot();
		
}

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Maybe if you first set the visible estate to false and then you delete it, it will work.

I hope that helps.
Regards