Method BuildRing

Interaction/Widgets/vtkCompassRepresentation.cxx:173–222

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//------------------------------------------------------------------------------
void vtkCompassRepresentation::BuildRing()
{
  // create the polydata
  this->Ring = vtkPolyData::New();
  this->Ring->SetPoints(this->Points);

  // build the cells
  vtkCellArray* ringCells = vtkCellArray::New();
  for (int i = 0; i < 4; ++i)
  {
    ringCells->InsertNextCell(17);
    for (int j = 0; j < 8; ++j)
    {
      ringCells->InsertCellPoint(i * 9 + j);
    }
    for (int j = 0; j < 8; ++j)
    {
      ringCells->InsertCellPoint(i * 9 + 35 + 7 - j);
    }
    ringCells->InsertCellPoint(i * 9);
  }
  this->Ring->SetLines(ringCells);
  ringCells->Delete();

  // add some polys
  vtkCellArray* markCells = vtkCellArray::New();
  for (int i = 1; i < 4; ++i)
  {
    markCells->InsertNextCell(3);
    markCells->InsertCellPoint(i + 69);
    markCells->InsertCellPoint(i * 9 + 35);
    markCells->InsertCellPoint(i * 9 + 33);
  }
  this->Ring->SetPolys(markCells);
  markCells->Delete();

  // build the points
  for (int i = 0; i < 35; ++i)
  {
    this->Points->SetPoint(i, this->OuterRadius * cos(vtkMath::RadiansFromDegrees(10. * (i + 10))),
      this->OuterRadius * sin(vtkMath::RadiansFromDegrees(10. * (i + 10))), 0.0);
    this->Points->SetPoint(i + 35,
      this->InnerRadius * cos(vtkMath::RadiansFromDegrees(10. * (i + 10))),
      this->InnerRadius * sin(vtkMath::RadiansFromDegrees(10. * (i + 10))), 0.0);
  }
  // add the WSE points
  this->Points->SetPoint(70, -this->OuterRadius - 0.1, 0.0, 0.0);
  this->Points->SetPoint(71, 0.0, -this->OuterRadius - 0.1, 0.0);
  this->Points->SetPoint(72, this->OuterRadius + 0.1, 0.0, 0.0);
}

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vtkCompassRepresentation::~vtkCompassRepresentation()