Method Scale

Interaction/Widgets/vtkPointWidget.cxx:574–611

}

void vtkPointWidget::Scale(double* p1, double* p2, int vtkNotUsed(X), int Y)
{
  // Get the motion vector
  double v[3];
  v[0] = p2[0] - p1[0];
  v[1] = p2[1] - p1[1];
  v[2] = p2[2] - p1[2];

  // int res = this->Cursor3D->GetResolution();
  double* bounds = this->Cursor3D->GetModelBounds();
  double* focus = this->Cursor3D->GetFocalPoint();

  // Compute the scale factor
  double sf = vtkMath::Norm(v) /
    sqrt((bounds[1] - bounds[0]) * (bounds[1] - bounds[0]) +
      (bounds[3] - bounds[2]) * (bounds[3] - bounds[2]) +
      (bounds[5] - bounds[4]) * (bounds[5] - bounds[4]));

  if (Y > this->Interactor->GetLastEventPosition()[1])
  {
    sf = 1.0 + sf;
  }
  else
  {
    sf = 1.0 - sf;
  }

  // Move the end points
  double newBounds[6];
  for (int i = 0; i < 3; i++)
  {
    newBounds[2 * i] = sf * (bounds[2 * i] - focus[i]) + focus[i];
    newBounds[2 * i + 1] = sf * (bounds[2 * i + 1] - focus[i]) + focus[i];
  }

  this->Cursor3D->SetModelBounds(newBounds);
  this->Cursor3D->Update();
}

void vtkPointWidget::CreateDefaultProperties()
{