private void _transferVertexData(int vertexFrom, int vertexTo) {
   int v1 = m_shape.getUserIndex(vertexTo, m_userIndexSortedIndexToVertex);
   int v2 = m_shape.getUserIndex(vertexTo, m_userIndexSortedAngleIndexToVertex);
   m_shape.transferAllDataToTheVertex(vertexFrom, vertexTo);
   m_shape.setUserIndex(vertexTo, m_userIndexSortedIndexToVertex, v1);
   m_shape.setUserIndex(vertexTo, m_userIndexSortedAngleIndexToVertex, v2);
 }