Method MapValue

Common/Core/vtkLookupTable.cxx:767–792

------------------------------------------------------------------------------ Given a scalar value v, return an RGBA color value from lookup table.

//------------------------------------------------------------------------------
// Given a scalar value v, return an RGBA color value from lookup table.
const unsigned char* vtkLookupTable::MapValue(double v)
{
  vtkIdType index = this->GetIndex(v);
  if (index < 0)
  {
    return this->GetNanColorAsUnsignedChars();
  }
  else if (index == 0)
  {
    if (this->UseBelowRangeColor && v < this->TableRange[0])
    {
      this->GetColorAsUnsignedChars(this->GetBelowRangeColor(), this->RGBABytes);
      return this->RGBABytes;
    }
  }
  else if (index == this->NumberOfColors - 1)
  {
    if (this->UseAboveRangeColor && v > this->TableRange[1])
    {
      this->GetColorAsUnsignedChars(this->GetAboveRangeColor(), this->RGBABytes);
      return this->RGBABytes;
    }
  }

  return this->Table->GetPointer(0) + 4 * index;
}
VTK_ABI_NAMESPACE_END

namespace