Method GetTable

Rendering/Core/vtkColorTransferFunction.cxx:782–1272

------------------------------------------------------------------------------ Returns a table of RGB colors at regular intervals along the function

//------------------------------------------------------------------------------
// Returns a table of RGB colors at regular intervals along the function
void vtkColorTransferFunction::GetTable(double xStart, double xEnd, int size, double* table)
{
  int i, j;

  // Special case: If either the start or end is a NaN, then all any
  // interpolation done on them is also a NaN.  Therefore, fill the table with
  // the NaN color.
  if (vtkMath::IsNan(xStart) || vtkMath::IsNan(xEnd))
  {
    double* tableEntry = table;
    for (i = 0; i < size; i++)
    {
      tableEntry[0] = this->NanColor[0];
      tableEntry[1] = this->NanColor[1];
      tableEntry[2] = this->NanColor[2];
      tableEntry += 3;
    }
    return;
  }

  int idx = 0;
  int numNodes = static_cast<int>(this->Internal->Nodes.size());

  // Need to keep track of the last value so that
  // we can fill in table locations past this with
  // this value if Clamping is On.
  double lastR = 0.0;
  double lastG = 0.0;
  double lastB = 0.0;
  if (numNodes != 0)
  {
    lastR = this->Internal->Nodes[numNodes - 1]->R;
    lastG = this->Internal->Nodes[numNodes - 1]->G;
    lastB = this->Internal->Nodes[numNodes - 1]->B;
  }

  double* tptr = nullptr;
  double x = 0.0;
  double x1 = 0.0;
  double x2 = 0.0;
  double rgb1[3] = { 0.0, 0.0, 0.0 };
  double rgb2[3] = { 0.0, 0.0, 0.0 };
  double midpoint = 0.0;
  double sharpness = 0.0;

  // If the scale is logarithmic, make sure the range is valid.
  bool usingLogScale = this->Scale == VTK_CTF_LOG10;
  if (usingLogScale)
  {
    // Note: This requires range[0] <= range[1].
    usingLogScale = this->Range[0] > 0.0;
  }

  double logStart = 0.0;
  double logEnd = 0.0;
  double logX = 0.0;
  if (usingLogScale)
  {