Method Render

Interaction/Image/vtkImageViewer2.cxx:618–669

------------------------------------------------------------------------------

//------------------------------------------------------------------------------
void vtkImageViewer2::Render()
{
  if (this->FirstRender)
  {
    // Initialize the size if not set yet

    vtkAlgorithm* input = this->GetInputAlgorithm();
    if (input)
    {
      input->UpdateInformation();
      int* w_ext =
        this->GetInputInformation()->Get(vtkStreamingDemandDrivenPipeline::WHOLE_EXTENT());
      int xs = 0, ys = 0;

      switch (this->SliceOrientation)
      {
        case vtkImageViewer2::SLICE_ORIENTATION_XY:
        default:
          xs = w_ext[1] - w_ext[0] + 1;
          ys = w_ext[3] - w_ext[2] + 1;
          break;

        case vtkImageViewer2::SLICE_ORIENTATION_XZ:
          xs = w_ext[1] - w_ext[0] + 1;
          ys = w_ext[5] - w_ext[4] + 1;
          break;

        case vtkImageViewer2::SLICE_ORIENTATION_YZ:
          xs = w_ext[3] - w_ext[2] + 1;
          ys = w_ext[5] - w_ext[4] + 1;
          break;
      }

      // if it would be smaller than 150 by 100 then limit to 150 by 100
      if (this->RenderWindow->GetSize()[0] == 0)
      {
        this->RenderWindow->SetSize(xs < 150 ? 150 : xs, ys < 100 ? 100 : ys);
      }

      if (this->Renderer)
      {
        this->Renderer->ResetCamera();
        this->Renderer->GetActiveCamera()->SetParallelScale(xs < 150 ? 75 : (xs - 1) / 2.0);
      }
      this->FirstRender = 0;
    }
  }
  if (this->GetInput())
  {
    this->RenderWindow->Render();
  }
}

//------------------------------------------------------------------------------
const char* vtkImageViewer2::GetWindowName()