replot() after changing the x- and yValue of QwtPlotMarker

Hello,

I want to drag my QwtPlotMarker on the plot and thus I have writen the following functions:

Code:

---

void Plot::cursorSelected(const QwtDoublePoint &Point)
{
	std::cout << "in Plot::cursorSelected" << std::endl;
	const QwtPlotItemList& List = itemList();
	QwtPlotItemIterator Iter = List.begin();
 
	selectedPoint = NULL;
	std::cout << "selectedPoint = " << selectedPoint << std::endl;
	std::cout << "Point = " << Point.x() << ", " << Point.y()<< std::endl;
  while(Iter != List.end())
  {
     QwtPlotItem *pItem = (QwtPlotItem *)(*Iter);
 
     if(pItem->rtti() == QwtPlotItem::Rtti_PlotMarker)
        if(pItem->boundingRect().contains(Point)){
        	std::cout << "MATCH"  << std::endl;
			 selectedPoint = dynamic_cast<QwtPlotMarker*>(pItem);
			 std::cout << "selectedPoint = " << selectedPoint << std::endl;
        }
     Iter++;
  }
}
 
void Plot::cursorMoved( const QPoint& Point){
	std::cout << "in Plot::cursorMoved" << std::endl;
	if(selectedPoint){
		double xData = this->invTransform(selectedPoint->xAxis(), Point.x());;
		double  yData =this->invTransform(selectedPoint->yAxis(), Point.y());;
 
		    std::cout << "xData: " << xData <<"yData: " << yData<< std::endl;
		    selectedPoint->setXValue(xData);
		    selectedPoint->setYValue(yData);
 
		    std::cout << "selectedPoint->xValue(): " << selectedPoint->xValue() <<"selectedPoint->yValue(): " << selectedPoint->yValue()<< std::endl;
		    this->replot();
	}
}

---

and I get the following output if I drag the Marker:

Quote:

---

in Plot::cursorMoved
xData: 0.38022yData: -0.00858369
selectedPoint->xValue(): 0.38022selectedPoint->yValue(): -0.00858369
in Plot::cursorMoved
xData: 0.410989yData: -0.0343348
selectedPoint->xValue(): 0.410989selectedPoint->yValue(): -0.0343348
in Plot::cursorMoved
xData: 0.481319yData: -0.0772532
selectedPoint->xValue(): 0.481319selectedPoint->yValue(): -0.0772532
in Plot::cursorSelected
selectedPoint = 0
Point = 0.481319, -0.0772532

---

That means the coordinates of the marker are changed, but the command this->replot() does not work because the marker is still on its last position.
Or does I have to repaint/ redraw the marker at new position by calling its member function "draw"?

Help me please.

Thank you