Method Scale

Interaction/Widgets/vtkLineWidget.cxx:879–920

------------------------------------------------------------------------------

//------------------------------------------------------------------------------
void vtkLineWidget::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->LineSource->GetResolution();
  double* pt1 = this->LineSource->GetPoint1();
  double* pt2 = this->LineSource->GetPoint2();

  double center[3];
  center[0] = (pt1[0] + pt2[0]) / 2.0;
  center[1] = (pt1[1] + pt2[1]) / 2.0;
  center[2] = (pt1[2] + pt2[2]) / 2.0;

  // Compute the scale factor
  double sf = vtkMath::Norm(v) / sqrt(vtkMath::Distance2BetweenPoints(pt1, pt2));
  if (Y > this->Interactor->GetLastEventPosition()[1])
  {
    sf = 1.0 + sf;
  }
  else
  {
    sf = 1.0 - sf;
  }

  // Move the end points
  double point1[3], point2[3];
  for (int i = 0; i < 3; i++)
  {
    point1[i] = sf * (pt1[i] - center[i]) + center[i];
    point2[i] = sf * (pt2[i] - center[i]) + center[i];
  }

  this->LineSource->SetPoint1(point1);
  this->LineSource->SetPoint2(point2);
  this->LineSource->Update();

  this->BuildRepresentation();
}

//------------------------------------------------------------------------------
void vtkLineWidget::CreateDefaultProperties()