Qwt Problem

[allensr]

I'm having a problem with my app crashing. I have a QTableWidget that has 2 columns that I am populating with a drag and drop event. If I plot everything in the table I have no problem. If I select a few rows and only try to plot them, I crash. Here is my slot that is connected to a "Plot" button. Can anyone tell what I am doing wrong?

void cPlot2d::setup2dPlot()
{
   QAbstractItemModel * model = this->mTableWidget->model();
   QItemSelectionModel * selectionModel = this->mTableWidget->selectionModel();
   QModelIndex index = model->index(0,0);
 
   int totalRowCount = model->rowCount();
   bool select(false);
 
   //If user selects any items this model contains it
   QItemSelection selection = selectionModel->selection();
   QModelIndexList list = selection.indexes();
 
   //Number of items selected
   int selectCount = list.count();
   int numRowsSelected(0);
   for(int i=0;i<selectCount;++i)
   {
      if(list[i].column()==0)
         ++numRowsSelected;
   }
 
   QwtArray<double> x;
   QwtArray<double> y;
   QwtArray<double> xSelect;
   QwtArray<double> ySelect;
 
   if(totalRowCount > 0)
   {
      //Has any items been selected
      if(selectCount>0)
      {
         select = true;
         for(int i=0; i<selectCount; ++i)
         {
            //For MVC, get the data out of the model
            //Data is stored contiguously in list, so got to figure out what column data is in
            //x=0 y=1
            if(list.at(i).column() == 0)
            {
               xSelect.push_back(list.at(i).data().toDouble());
            }
            else
            {
               ySelect.push_back(list.at(i).data().toDouble());
            }
         }
      }
      //No items selected, load up entire table
      else
      {
 
         for(int i=0; i<totalRowCount; ++i)
         {
            //For MVC, get the data out of the model
            x.push_back(model->data(index.sibling(i,0)).toDouble());
            y.push_back(model->data(index.sibling(i,1)).toDouble());
         }
      }
      // Set up Qwt Plot stuff
      QwtPlot * plot(new QwtPlot(this));
      plot->setTitle("2D Plot");
      // axis titles
      plot->setAxisTitle(QwtPlot::xBottom, "x");
      plot->setAxisTitle(QwtPlot::yLeft, "y");
 
      // curve
      QwtPlotCurve * curve(new QwtPlotCurve("Curve 1"));
      curve->attach(plot);
      // data
      if(select)
      {
         //User selected data to plot
         curve->setData(xSelect, ySelect);
      }
      else
      {
         //Plot entire table
         curve->setData(x, y);
      }
      // pen
      curve->setPen(QPen(QColor(0, 0, 200)));
      // style
      curve->setStyle(QwtPlotCurve::Lines);
 
      plot->replot();
 
      cMainWindow::getInstance()->mWorkspace->addWindow(plot)->show();
 
   }
   else
   {
      cout << " NO DATA TO PLOT!! " << endl;
      return;
   }
 
} // cPlot2d::setup2dPlot

void cPlot2d::setup2dPlot()
{
   QAbstractItemModel * model = this->mTableWidget->model();
   QItemSelectionModel * selectionModel = this->mTableWidget->selectionModel();
   QModelIndex index = model->index(0,0);
  
   int totalRowCount = model->rowCount();
   bool select(false);

   //If user selects any items this model contains it
   QItemSelection selection = selectionModel->selection();
   QModelIndexList list = selection.indexes();

   //Number of items selected
   int selectCount = list.count();
   int numRowsSelected(0);
   for(int i=0;i<selectCount;++i)
   {
      if(list[i].column()==0)
         ++numRowsSelected;
   }

   QwtArray<double> x;
   QwtArray<double> y;
   QwtArray<double> xSelect;
   QwtArray<double> ySelect;

   if(totalRowCount > 0)
   {
      //Has any items been selected
      if(selectCount>0)
      {
         select = true;
         for(int i=0; i<selectCount; ++i)
         {
            //For MVC, get the data out of the model
            //Data is stored contiguously in list, so got to figure out what column data is in
            //x=0 y=1
            if(list.at(i).column() == 0)
            {
               xSelect.push_back(list.at(i).data().toDouble());
            }
            else
            {
               ySelect.push_back(list.at(i).data().toDouble());
            }
         }
      }
      //No items selected, load up entire table
      else
      {
      
         for(int i=0; i<totalRowCount; ++i)
         {
            //For MVC, get the data out of the model
            x.push_back(model->data(index.sibling(i,0)).toDouble());
            y.push_back(model->data(index.sibling(i,1)).toDouble());
         }
      }
      // Set up Qwt Plot stuff
      QwtPlot * plot(new QwtPlot(this));
      plot->setTitle("2D Plot");
      // axis titles
      plot->setAxisTitle(QwtPlot::xBottom, "x");
      plot->setAxisTitle(QwtPlot::yLeft, "y");

      // curve
      QwtPlotCurve * curve(new QwtPlotCurve("Curve 1"));
      curve->attach(plot);
      // data
      if(select)
      {
         //User selected data to plot
         curve->setData(xSelect, ySelect);
      }
      else
      {
         //Plot entire table
         curve->setData(x, y);
      }
      // pen
      curve->setPen(QPen(QColor(0, 0, 200)));
      // style
      curve->setStyle(QwtPlotCurve::Lines);

      plot->replot();

      cMainWindow::getInstance()->mWorkspace->addWindow(plot)->show();

   }
   else
   {
      cout << " NO DATA TO PLOT!! " << endl;
      return;
   }

} // cPlot2d::setup2dPlot

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