Method UpdateDisplayExtent

Interaction/Image/vtkImageViewer2.cxx:329–394

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//------------------------------------------------------------------------------
void vtkImageViewer2::UpdateDisplayExtent()
{
  vtkAlgorithm* input = this->GetInputAlgorithm();
  if (!input || !this->ImageActor)
  {
    return;
  }

  input->UpdateInformation();
  vtkInformation* outInfo = input->GetOutputInformation(0);
  int* w_ext = outInfo->Get(vtkStreamingDemandDrivenPipeline::WHOLE_EXTENT());

  // Is the slice in range ? If not, fix it

  int slice_min = w_ext[this->SliceOrientation * 2];
  int slice_max = w_ext[this->SliceOrientation * 2 + 1];
  if (this->Slice < slice_min || this->Slice > slice_max)
  {
    this->Slice = static_cast<int>((slice_min + slice_max) * 0.5);
  }

  // Set the image actor

  switch (this->SliceOrientation)
  {
    case vtkImageViewer2::SLICE_ORIENTATION_XY:
      this->ImageActor->SetDisplayExtent(
        w_ext[0], w_ext[1], w_ext[2], w_ext[3], this->Slice, this->Slice);
      break;

    case vtkImageViewer2::SLICE_ORIENTATION_XZ:
      this->ImageActor->SetDisplayExtent(
        w_ext[0], w_ext[1], this->Slice, this->Slice, w_ext[4], w_ext[5]);
      break;

    case vtkImageViewer2::SLICE_ORIENTATION_YZ:
      this->ImageActor->SetDisplayExtent(
        this->Slice, this->Slice, w_ext[2], w_ext[3], w_ext[4], w_ext[5]);
      break;
  }

  // Figure out the correct clipping range

  if (this->Renderer)
  {
    if (this->InteractorStyle && this->InteractorStyle->GetAutoAdjustCameraClippingRange())
    {
      this->Renderer->ResetCameraClippingRange();
    }
    else
    {
      vtkCamera* cam = this->Renderer->GetActiveCamera();
      if (cam)
      {
        double bounds[6];
        this->ImageActor->GetBounds(bounds);
        double spos = bounds[this->SliceOrientation * 2];
        double cpos = cam->GetPosition()[this->SliceOrientation];