Method SizeHandlesInPixels

Interaction/Widgets/vtkWidgetRepresentation.cxx:213–247

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//------------------------------------------------------------------------------
double vtkWidgetRepresentation::SizeHandlesInPixels(double factor, double pos[3])
{
  //
  int i;
  vtkRenderer* renderer;

  if (!this->ValidPick || !(renderer = this->Renderer) || !renderer->GetActiveCamera())
  {
    return (this->HandleSize * factor * this->InitialLength);
  }
  else
  {
    double radius, z;
    double lowerLeft[4], upperRight[4];
    double focalPoint[4];

    vtkInteractorObserver::ComputeWorldToDisplay(
      this->Renderer, pos[0], pos[1], pos[2], focalPoint);
    z = focalPoint[2];

    double x = focalPoint[0] - this->HandleSize / 2.0;
    double y = focalPoint[1] - this->HandleSize / 2.0;
    vtkInteractorObserver::ComputeDisplayToWorld(this->Renderer, x, y, z, lowerLeft);

    x = focalPoint[0] + this->HandleSize / 2.0;
    y = focalPoint[1] + this->HandleSize / 2.0;
    vtkInteractorObserver::ComputeDisplayToWorld(this->Renderer, x, y, z, upperRight);

    for (radius = 0.0, i = 0; i < 3; i++)
    {
      radius += (upperRight[i] - lowerLeft[i]) * (upperRight[i] - lowerLeft[i]);
    }
    return (factor * (sqrt(radius) / 2.0));
  }
}

//------------------------------------------------------------------------------
double vtkWidgetRepresentation::SizeHandlesRelativeToViewport(double factor, double pos[3])