Hi All,

    I am newbie to qwt and qt. I am trying to alter the example data_plot so that a mark will appear on the graphs at some particular point.

        For this i used the following code

iValX = cRight->x(x);
        iValY = cLeft->y(x);
        printf("\n X & Y Val  = %d  %d\n",iValX,iValY);
   
        //if((x%10) == 0)
        if(iValX == 15)
        {
                 mY->setXValue(x);
            QPen p;
             const QColor oldcc = p.color();
        cRight->setSymbol(QwtSymbol(QwtSymbol::VLine,
            QBrush(c), QPen(c), QSize(1, 10)) );
        }   
        if(iValY == 15)
        {
        cLeft->setSymbol(QwtSymbol(QwtSymbol::VLine,
            QBrush(c), QPen(c), QSize(1, 10)) );
              }

           I am also attaching the graph i am able to plot .

            Can any one help me out to solve this problem.

         I am expecting a vertical lines on the curve when the value == 15 but, i am getting multiple vertical lines.



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