Method SetViewInfo

Rendering/Core/vtkLabeledContourMapper.cxx:1042–1114

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//------------------------------------------------------------------------------
bool vtkLabeledContourMapper::Private::SetViewInfo(vtkRenderer* ren, vtkActor* act)
{
  vtkCamera* cam = ren->GetActiveCamera();
  if (!cam)
  {
    vtkGenericWarningMacro(<< "No active camera on renderer.");
    return false;
  }

  vtkMatrix4x4* mat = cam->GetModelViewTransformMatrix();
  this->CameraRight.Set(mat->GetElement(0, 0), mat->GetElement(0, 1), mat->GetElement(0, 2));
  this->CameraUp.Set(mat->GetElement(1, 0), mat->GetElement(1, 1), mat->GetElement(1, 2));
  this->CameraForward.Set(mat->GetElement(2, 0), mat->GetElement(2, 1), mat->GetElement(2, 2));

  // figure out the same aspect ratio used by the render engine
  // (see vtkOpenGLCamera::Render())
  int lowerLeft[2];
  int usize, vsize;
  double aspect1[2];
  double aspect2[2];
  ren->GetTiledSizeAndOrigin(&usize, &vsize, lowerLeft, lowerLeft + 1);
  ren->ComputeAspect();
  ren->GetAspect(aspect1);
  ren->vtkViewport::ComputeAspect();
  ren->vtkViewport::GetAspect(aspect2);
  double aspectModification = (aspect1[0] * aspect2[1]) / (aspect1[1] * aspect2[0]);
  double aspect = aspectModification * usize / vsize;

  // Get the mvp (mcdc) matrix
  double mvp[16];
  mat = cam->GetCompositeProjectionTransformMatrix(aspect, -1, 1);
  vtkMatrix4x4::DeepCopy(mvp, mat);

  // Apply the actor's matrix:
  vtkMatrix4x4::DeepCopy(this->ActorMatrix.GetData(), act->GetMatrix());
  vtkMatrix4x4::Multiply4x4(mvp, this->ActorMatrix.GetData(), this->AMVP.GetData());

  vtkMatrix4x4::Invert(this->ActorMatrix.GetData(), this->InverseActorMatrix.GetData());

  if (vtkWindow* win = ren->GetVTKWindow())
  {
    const int* size = win->GetSize();
    this->WindowSize[0] = size[0];
    this->WindowSize[1] = size[1];

    size = ren->GetSize();
    this->ViewPortSize[0] = size[0];
    this->ViewPortSize[1] = size[1];

    ren->GetViewport(this->ViewPort.GetData());

    double* tvport = win->GetTileViewport();
    this->NormalizedViewPort[0] = std::max(this->ViewPort[0], tvport[0]);
    this->NormalizedViewPort[1] = std::max(this->ViewPort[1], tvport[1]);
    this->NormalizedViewPort[2] = std::min(this->ViewPort[2], tvport[2]);
    this->NormalizedViewPort[3] = std::min(this->ViewPort[3], tvport[3]);

    this->ViewportBounds[0] = this->ViewPort[0] * this->WindowSize[0];