Method LabelTree

Rendering/Label/vtkLabeledTreeMapDataMapper.cxx:479–550

}

void vtkLabeledTreeMapDataMapper::LabelTree(vtkTree* tree, vtkFloatArray* boxInfo,
  vtkDataArray* numericData, vtkStringArray* stringData, int activeComp, int numComps)
{

  float blimits[4], blimitsDC[4], textPosWC[3];
  char string[1024];
  int results;
  vtkTextProperty* tprop = nullptr;
  vtkIdType vertex, level, root = tree->GetRoot();
  if (root < 0)
  {
    vtkErrorMacro(<< "Input Tree does not have a root.");
    return;
  }

  this->NumberOfLabels = 0;
  vtkTreeDFSIterator* dfs = vtkTreeDFSIterator::New();
  dfs->SetTree(tree);
  while (dfs->HasNext())
  {
    // Are we suppose to display this vertex?
    vertex = dfs->Next();
    level = tree->GetLevel(vertex);

    if (level >= this->StartLevel && (this->EndLevel == -1 || level <= this->EndLevel))
    {
      boxInfo->GetTypedTuple(vertex, blimits); // Get the extents of the vertex
      if (this->ConvertToDC(blimits, blimitsDC))
      {
        continue;
      }

      this->GetVertexLabel(
        vertex, numericData, stringData, activeComp, numComps, string, sizeof(string));
      results = this->AnalyseLabel(string, level, blimitsDC, textPosWC, &tprop);
      if (results == 1)
      {
        // Label doesn't fit in its box - don't both processing children
        continue;
      }
    }
    else
    {
      // results == 2 from AnalyseLabel means that the label can't be
      // displayed due to reasons other than size - well in this
      // case we can't display due to the level limit we
      // also have to deactivate the mask for this level
      this->LabelMasks[level][0] = -1.0;
      results = 2;
    }

    if (!results)
    {
      if (!this->TextMappers[this->NumberOfLabels])
      {
        this->TextMappers[this->NumberOfLabels] = vtkTextMapper::New();
      }
      this->TextMappers[this->NumberOfLabels]->SetInput(string);