Method Render

Interaction/Image/vtkImageViewer.cxx:216–235

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//------------------------------------------------------------------------------
void vtkImageViewer::Render()
{
  if (this->FirstRender)
  {
    // initialize the size if not set yet
    if (this->RenderWindow->GetSize()[0] == 0 && this->ImageMapper->GetInput())
    {
      // get the size from the mappers input
      this->ImageMapper->GetInputAlgorithm()->UpdateInformation();
      int* ext = this->ImageMapper->GetInputInformation()->Get(
        vtkStreamingDemandDrivenPipeline::WHOLE_EXTENT());
      // if it would be smaller than 150 by 100 then limit to 150 by 100
      int xs = ext[1] - ext[0] + 1;
      int ys = ext[3] - ext[2] + 1;
      this->RenderWindow->SetSize(xs < 150 ? 150 : xs, ys < 100 ? 100 : ys);
    }
    this->FirstRender = 0;
  }
  this->RenderWindow->Render();
}

//------------------------------------------------------------------------------
void vtkImageViewer::SetOffScreenRendering(vtkTypeBool i)