Java Face.numVertices示例

  private Face connectHalfEdges(HalfEdge hedgePrev, HalfEdge hedge) {
    Face discardedFace = null;

    if (hedgePrev.oppositeFace()
        == hedge.oppositeFace()) { // then there is a redundant edge that we can get rid off

      Face oppFace = hedge.oppositeFace();
      HalfEdge hedgeOpp;

      if (hedgePrev == he0) {
        he0 = hedge;
      }
      if (oppFace.numVertices() == 3) { // then we can get rid of the opposite face altogether
        hedgeOpp = hedge.getOpposite().prev.getOpposite();

        oppFace.mark = DELETED;
        discardedFace = oppFace;
      } else {
        hedgeOpp = hedge.getOpposite().next;

        if (oppFace.he0 == hedgeOpp.prev) {
          oppFace.he0 = hedgeOpp;
        }
        hedgeOpp.prev = hedgeOpp.prev.prev;
        hedgeOpp.prev.next = hedgeOpp;
      }
      hedge.prev = hedgePrev.prev;
      hedge.prev.next = hedge;

      hedge.opposite = hedgeOpp;
      hedgeOpp.opposite = hedge;

      // oppFace was modified, so need to recompute
      oppFace.computeNormalAndCentroid();
    } else {
      hedgePrev.next = hedge;
      hedge.prev = hedgePrev;
    }
    return discardedFace;
  }