c++ vector反轉reverse

template <class BidirectionalIterator>
  void reverse ( BidirectionalIterator first, BidirectionalIterator last);

如果不是改變原來的容器，而是翻轉之后放在新容器里面，直接用reverse_copy ( BidirectionalIterator first,
                                BidirectionalIterator last, OutputIterator result );

std::reverse(trianglePoints.begin(), trianglePoints.end());