Method GetType

Common/DataModel/vtkPiecewiseFunction.cxx:171–242

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//------------------------------------------------------------------------------
const char* vtkPiecewiseFunction::GetType()
{
  unsigned int i;
  double value;
  double prev_value = 0.0;
  int function_type;

  function_type = 0;

  if (!this->Internal->Nodes.empty())
  {
    prev_value = this->Internal->Nodes[0]->Y;
  }

  for (i = 1; i < this->Internal->Nodes.size(); i++)
  {
    value = this->Internal->Nodes[i]->Y;

    // Do not change the function type if equal
    if (value != prev_value)
    {
      if (value > prev_value)
      {
        switch (function_type)
        {
          case 0:
          case 1:
            function_type = 1; // NonDecreasing
            break;
          case 2:
            function_type = 3; // Varied
            break;
        }
      }
      else // value < prev_value
      {
        switch (function_type)
        {
          case 0:
          case 2:
            function_type = 2; // NonIncreasing
            break;
          case 1:
            function_type = 3; // Varied
            break;
        }
      }
    }

    prev_value = value;

    // Exit loop if we find a Varied function
    if (function_type == 3)
    {
      break;
    }
  }