Method StartWindowLevel

Interaction/Widgets/vtkImagePlaneWidget.cxx:948–1009

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//------------------------------------------------------------------------------
void vtkImagePlaneWidget::StartWindowLevel()
{
  int X = this->Interactor->GetEventPosition()[0];
  int Y = this->Interactor->GetEventPosition()[1];

  // Okay, make sure that the pick is in the current renderer
  if (!this->CurrentRenderer || !this->CurrentRenderer->IsInViewport(X, Y))
  {
    this->State = vtkImagePlaneWidget::Outside;
    return;
  }

  // Okay, we can process this. If anything is picked, then we
  // can start window-levelling.
  vtkAssemblyPath* path = this->GetAssemblyPath(X, Y, 0., this->PlanePicker);

  int found = 0;
  int i;
  if (path != nullptr)
  {
    // Deal with the possibility that we may be using a shared picker
    vtkCollectionSimpleIterator sit;
    path->InitTraversal(sit);
    vtkAssemblyNode* node;
    for (i = 0; i < path->GetNumberOfItems() && !found; i++)
    {
      node = path->GetNextNode(sit);
      if (node->GetViewProp() == vtkProp::SafeDownCast(this->TexturePlaneActor))
      {
        found = 1;
      }
    }
  }

  this->InitialWindow = this->CurrentWindow;
  this->InitialLevel = this->CurrentLevel;

  if (!found || path == nullptr)
  {
    this->State = vtkImagePlaneWidget::Outside;
    this->HighlightPlane(0);
    this->ActivateText(0);
    return;
  }
  else
  {
    this->State = vtkImagePlaneWidget::WindowLevelling;
    this->HighlightPlane(1);
    this->ActivateText(1);
    this->StartWindowLevelPositionX = X;
    this->StartWindowLevelPositionY = Y;
    this->ManageTextDisplay();
  }

  this->EventCallbackCommand->SetAbortFlag(1);
  this->StartInteraction();

  double wl[2] = { this->CurrentWindow, this->CurrentLevel };