Method BuildRepresentation

Interaction/Widgets/vtkAngleRepresentation2D.cxx:213–344

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//------------------------------------------------------------------------------
void vtkAngleRepresentation2D::BuildRepresentation()
{
  if (this->Point1Representation == nullptr || this->CenterRepresentation == nullptr ||
    this->Point2Representation == nullptr)
  {
    // for now, return. Could create defaults here.
    return;
  }

  if (!(this->GetMTime() > this->BuildTime ||
        this->Point1Representation->GetMTime() > this->BuildTime ||
        this->CenterRepresentation->GetMTime() > this->BuildTime ||
        this->Point2Representation->GetMTime() > this->BuildTime ||
        (this->Renderer && this->Renderer->GetVTKWindow() &&
          this->Renderer->GetVTKWindow()->GetMTime() > this->BuildTime)))
  {
    return;
  }

  this->Superclass::BuildRepresentation();

  // Local coordinate values
  vtkVector3d p1w, p2w, cw;
  this->GetPoint1WorldPosition(p1w.GetData());
  this->GetCenterWorldPosition(cw.GetData());
  this->GetPoint2WorldPosition(p2w.GetData());

  // Update the rays
  this->Ray1->GetPositionCoordinate()->SetValue(cw.GetData());
  this->Ray1->GetPosition2Coordinate()->SetValue(p1w.GetData());
  this->Ray2->GetPositionCoordinate()->SetValue(cw.GetData());
  this->Ray2->GetPosition2Coordinate()->SetValue(p2w.GetData());

  // Compute the angle.
  // NOTE: There is some concern that there may be fluctuations in the angle
  // value as the camera moves, etc. This calculation may have to be dampened.

  vtkVector3d vector1 = p1w - cw;
  vtkVector3d vector2 = p2w - cw;
  const double normV1 = vector1.Normalize();
  const double normV2 = vector2.Normalize();
  const double angle = vtkMath::DegreesFromRadians(std::acos(vector1.Dot(vector2))) * this->Scale;

  // Construct label
  std::string labelFormat = this->LabelFormat ? vtk::to_std_format(this->LabelFormat) : "";
  std::string string;
  VTK_FORMAT_IF_ERROR_RETURN(string = vtk::format(labelFormat, angle), );
  if (string.empty())
  {
    this->ArcVisibility = 0;
    vtkWarningMacro("Couldn't format label.");
    return;
  }
  this->Arc->SetLabel(string.c_str());

  // Place the label and place the arc
  vtkVector3d p1d, p2d, cd;
  this->GetPoint1DisplayPosition(p1d.GetData());