Method MouseDoubleClickEvent

Views/Infovis/vtkDendrogramItem.cxx:771–813

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//------------------------------------------------------------------------------
bool vtkDendrogramItem::MouseDoubleClickEvent(const vtkContextMouseEvent& event)
{
  // get the position of the double click and convert it to scene coordinates
  double pos[3];
  vtkNew<vtkMatrix3x3> inverse;
  pos[0] = event.GetPos().GetX();
  pos[1] = event.GetPos().GetY();
  pos[2] = 0;
  this->GetScene()->GetTransform()->GetInverse(inverse);
  inverse->MultiplyPoint(pos, pos);

  bool rotatedTree = false;
  int orientation = this->GetOrientation();
  if (orientation == vtkDendrogramItem::UP_TO_DOWN || orientation == vtkDendrogramItem::DOWN_TO_UP)
  {
    rotatedTree = true;
  }

  // this event is only captured within the tree (not the vertex labels)
  if ((!rotatedTree && pos[0] <= this->MaxX && pos[0] >= this->MinX) ||
    (rotatedTree && pos[1] <= this->MaxY && pos[1] >= this->MinY))
  {
    vtkIdType collapsedSubTree = this->GetClickedCollapsedSubTree(pos[0], pos[1]);
    if (collapsedSubTree != -1)
    {
      // re-expand the subtree rooted at this vertex
      this->ExpandSubTree(collapsedSubTree);
    }
    else
    {
      // collapse the subtree rooted at this vertex
      vtkIdType closestVertex =
        this->GetClosestVertex((pos[0] - this->Position[0]) / this->MultiplierX,
          (pos[1] - this->Position[1]) / this->MultiplierY);
      this->CollapseSubTree(closestVertex);
    }

    this->Scene->SetDirty(true);
    return true;
  }

  return false;
}

//------------------------------------------------------------------------------
vtkIdType vtkDendrogramItem::GetClickedCollapsedSubTree(double x, double y)