Method RecomputeArrows

Interaction/Widgets/vtkCameraHandleSource.cxx:108–146

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//------------------------------------------------------------------------------
void vtkCameraHandleSource::RecomputeArrows()
{
  double arrowOrigin[3];
  this->GetPosition(arrowOrigin);
  double rotationAxis[3];
  double rotationAngle;
  double baseVector[3] = { 1, 0, 0 };

  this->UpTransform->Identity();
  this->FrontTransform->Identity();

  vtkMatrix4x4* matrix = this->Camera->GetModelViewTransformMatrix();
  double ViewUp[3];

  ViewUp[0] = matrix->GetElement(1, 0);
  ViewUp[1] = matrix->GetElement(1, 1);
  ViewUp[2] = matrix->GetElement(1, 2);

  vtkMath::Normalize(ViewUp);
  rotationAngle = vtkMath::AngleBetweenVectors(baseVector, ViewUp);
  vtkMath::Cross(baseVector, ViewUp, rotationAxis);
  vtkMath::Normalize(rotationAxis);

  this->UpTransform->Scale(this->Size * 2, this->Size * 3, this->Size * 3);
  this->UpTransform->RotateWXYZ(vtkMath::DegreesFromRadians(rotationAngle), rotationAxis);
  this->UpTransform->Translate(arrowOrigin);

  double* ViewFront = this->Camera->GetDirectionOfProjection();
  vtkMath::Normalize(ViewFront);
  rotationAngle = vtkMath::AngleBetweenVectors(baseVector, ViewFront);
  vtkMath::Cross(baseVector, ViewFront, rotationAxis);
  vtkMath::Normalize(rotationAxis);

  this->FrontTransform->Scale(this->Size * 4, this->Size * 4, this->Size * 4);
  this->FrontTransform->RotateWXYZ(vtkMath::DegreesFromRadians(rotationAngle), rotationAxis);
  this->FrontTransform->Translate(arrowOrigin);

  this->ArrowsAppend->Update();
}

//------------------------------------------------------------------------------
void vtkCameraHandleSource::RecomputeSphere()