Method AllocateArrays

Common/DataModel/vtkFieldData.cxx:372–421

------------------------------------------------------------------------------ Set the number of arrays used to define the field.

//------------------------------------------------------------------------------
// Set the number of arrays used to define the field.
void vtkFieldData::AllocateArrays(int num)
{
  num = std::max(num, 0);

  if (num == this->NumberOfArrays)
  {
    return;
  }

  if (num == 0)
  {
    this->Initialize();
  }
  else if (num < this->NumberOfArrays)
  {
    for (int i = num; i < this->NumberOfArrays; ++i)
    {
      if (this->Data[i])
      {
        this->Data[i]->UnRegister(this);
      }
    }
    this->NumberOfArrays = num;
  }
  else // num > this->NumberOfArrays
  {
    vtkAbstractArray** data = new vtkAbstractArray*[num];
    this->Ranges.resize(num);
    this->FiniteRanges.resize(num);
    // copy the original data
    for (int i = 0; i < this->NumberOfArrays; ++i)
    {
      data[i] = this->Data[i];
    }

    // initialize the new arrays
    for (int i = this->NumberOfArrays; i < num; ++i)
    {
      data[i] = nullptr;
    }

    // get rid of the old data
    delete[] this->Data;

    // update object
    this->Data = data;
    this->NumberOfArrays = num;
  }
  this->Modified();
}

//------------------------------------------------------------------------------
// Set an array to define the field.