Method BuildAxes

Rendering/Annotation/vtkPolarAxesActor.cxx:715–879

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

//------------------------------------------------------------------------------
void vtkPolarAxesActor::BuildAxes(vtkViewport* viewport)
{
  if (!this->Camera)
  {
    vtkWarningMacro("vtkPolarAxesActor requires a Camera to be built.");
    return;
  }

  if (this->GetMTime() < this->BuildTime.GetMTime())
  {
    this->AutoScale(viewport);
    return;
  }

  // ---------- Angles check -----------
  // set angle range [0.0; 360.0]
  this->MaximumAngle = std::fmod(this->MaximumAngle, 360);
  this->MinimumAngle = std::fmod(this->MinimumAngle, 360);

  if (this->MaximumAngle < 0.0)
  {
    this->MaximumAngle += 360.0;
  }

  // set angle range [0.0; 360.0]
  if (this->MinimumAngle < 0.0)
  {
    this->MinimumAngle += 360.0;
  }

  // this->MaximumAngle < this->MinimumAngle is possible, no swap

  if (!this->CheckMembersConsistency())
  {
    return;
  }

  // Determine the bounds
  this->CalculateBounds();

  // Set polar axis endpoints
  vtkAxisActor* axis = this->PolarAxis;

  // compute ellipse angle
  double miniAngleEllipse = vtkPolarAxesActor::ComputeEllipseAngle(this->MinimumAngle, this->Ratio);

  // Set the start point and end point (world coord system) of the Polar Axis.
  double startPt[3], endPt[3];
  startPt[0] = this->Pole[0] + this->MinimumRadius * cos(miniAngleEllipse);
  startPt[1] = this->Pole[1] + this->MinimumRadius * this->Ratio * sin(miniAngleEllipse);
  startPt[2] = this->Pole[2];

  endPt[0] = this->Pole[0] + this->MaximumRadius * cos(miniAngleEllipse);
  endPt[1] = this->Pole[1] + this->MaximumRadius * this->Ratio * sin(miniAngleEllipse);
  endPt[2] = this->Pole[2];

  axis->GetPoint1Coordinate()->SetValue(startPt);
  axis->GetPoint2Coordinate()->SetValue(endPt);