ENH: Factorize the code to set a plot to a corner.

vtkChartXY::AddPlot now calls vtkChartXY::SetPlotCorner

Charts/vtkChartXY.cxx

@@ -593,10 +593,7 @@ void vtkChartXY::SetPlotCorner(vtkPlot *plot, int corner)
                     << corner);
     return;
     }
-  if (!this->RemovePlotFromCorners(plot))
-    {
-    vtkWarningMacro("Error removing plot from corners.");
-    }
+  this->RemovePlotFromCorners(plot);
   // Grow the plot corners if necessary
   if (int(this->ChartPrivate->PlotCorners.size()) <= corner)
     {
@@ -831,12 +828,9 @@ vtkIdType vtkChartXY::AddPlot(vtkPlot * plot)
     return -1;
     }
   plot->Register(this);
-  // Add the plot to the default corner
-  plot->SetXAxis(this->ChartPrivate->axes[vtkAxis::BOTTOM]);
-  plot->SetYAxis(this->ChartPrivate->axes[vtkAxis::LEFT]);
   this->ChartPrivate->plots.push_back(plot);
   vtkIdType plotIndex = this->ChartPrivate->plots.size() - 1;
-  this->ChartPrivate->PlotCorners[0]->AddItem(plot);
+  this->SetPlotCorner(plot, 0);
   // Ensure that the bounds are recalculated
   this->PlotTransformValid = false;
   // Mark the scene as dirty