Method PlaceAxes

Rendering/Annotation/vtkSpiderPlotActor.cxx:411–791

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#define VTK_RING_PTS 64
//------------------------------------------------------------------------------
int vtkSpiderPlotActor::PlaceAxes(vtkViewport* viewport, const int* vtkNotUsed(size))
{
  vtkIdType i, j, k;
  vtkDataObject* input = this->GetInput();
  vtkFieldData* field = input->GetFieldData();
  double v = 0.0;

  this->Initialize();

  if (!field)
  {
    return 0;
  }

  // Determine the shape of the field
  int numComponents = field->GetNumberOfComponents(); // number of components
  // Note: numComponents also includes the non-numeric arrays.

  int numColumns = 0;             // number of "columns" -- includes only numeric arrays.
  vtkIdType numRows = VTK_ID_MAX; // figure out number of rows
  vtkIdType numTuples;
  vtkDataArray* array;
  for (i = 0; i < field->GetNumberOfArrays(); i++)
  {
    array = field->GetArray(i);
    if (!array)
    {
      // skip over non-numeric arrays.
      continue;
    }
    numColumns += array->GetNumberOfComponents();
    numTuples = array->GetNumberOfTuples();
    numRows = std::min(numTuples, numRows);
  }

  // Determine the number of independent variables
  if (this->IndependentVariables == VTK_IV_COLUMN)
  {
    this->N = numColumns;
  }
  else // row
  {
    this->N = numRows;
  }

  if (this->N <= 0 || this->N >= VTK_ID_MAX)
  {
    this->N = 0;
    vtkErrorMacro(<< "No field data to plot");
    return 0;
  }

  // We need to loop over the field to determine the range of
  // each independent variable.
  this->Mins = new double[this->N];
  this->Maxs = new double[this->N];
  for (i = 0; i < this->N; i++)
  {