Method OnMouseMove

Views/Infovis/vtkInteractorStyleTreeMapHover.cxx:200–276

}

void vtkInteractorStyleTreeMapHover::OnMouseMove()
{
  int x = this->Interactor->GetEventPosition()[0];
  int y = this->Interactor->GetEventPosition()[1];
  this->FindPokedRenderer(x, y);
  vtkRenderer* r = this->CurrentRenderer;
  if (r == nullptr)
  {
    return;
  }

  if (!r->HasViewProp(this->Balloon))
  {
    r->AddActor(this->Balloon);
    this->Balloon->SetRenderer(r);
  }

  // Use the hardware picker to find a point in world coordinates.
  float binfo[4];
  vtkIdType id = this->GetTreeMapIdAtPos(x, y);

  if (id != -1)
  {
    this->GetBoundingBoxForTreeMapItem(id, binfo);
  }

  double loc[2] = { static_cast<double>(x), static_cast<double>(y) };
  this->Balloon->EndWidgetInteraction(loc);

  if ((this->Layout != nullptr) && (this->Layout->GetOutput() != nullptr))
  {

    vtkAbstractArray* absArray =
      this->Layout->GetOutput()->GetVertexData()->GetAbstractArray(this->LabelField);
    if (absArray != nullptr && id > -1)
    {
      std::string str;
      if (vtkArrayDownCast<vtkStringArray>(absArray))
      {
        str = vtkArrayDownCast<vtkStringArray>(absArray)->GetValue(id);
      }
      if (vtkArrayDownCast<vtkDataArray>(absArray))
      {
        str = vtkVariant(vtkArrayDownCast<vtkDataArray>(absArray)->GetTuple(id)[0]).ToString();
      }
      this->Balloon->SetBalloonText(str.c_str());
      vtkTree* tree = this->Layout->GetOutput();
      double z;
      if (this->TreeMapToPolyData != nullptr)
      {
        z = this->TreeMapToPolyData->GetLevelDeltaZ() * (tree->GetLevel(id) + 1);
      }
      else
      {
        z = 0.02;
      }
      this->HighlightPoints->SetPoint(0, binfo[0], binfo[2], z);
      this->HighlightPoints->SetPoint(1, binfo[1], binfo[2], z);