一种可能很好奇的方法：b是一个参考集，某个分子中的所有原子可能是工作集，也许代表了所有显示的原子对于b中的每个设置位：a）如果a也被设置，则清除a的一位，除非b ）如果未设置a，则将b的所有置位加到因此，如果a等于b->如果a是b的子集，则清除所有，然后-> b，如果b是a的子集，则- ->如果a仅与b相交，则a不是b，然后-> a或b如果a不与b相交，则a或b在“切换”模式下，当单击分子的任何原子时，您想要：（a）如果尚未显示，则要显示的分子中的所有原子，或者（b）如果已经显示了该分子的所有原子，则要隐藏的整个分子。
/* $RCSfile$ * $Author: egonw $ * $Date: 2005-11-10 09:52:44 -0600 (Thu, 10 Nov 2005) $ * $Revision: 4255 $ * * Copyright (C) 2003-2005 The Jmol Development Team * * Contact: jmol-developers@lists.sf.net * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. */ //package com.nowjava; import java.util.BitSet;//来自 时代Java - nowjava.com public class Main { /** * a perhaps curious method: * * b is a reference set, perhaps all atoms in a certain molecule a is the * working set, perhaps representing all displayed atoms * * For each set bit in b: a) if a is also set, then clear a's bit UNLESS b) if * a is not set, then add to a all set bits of b * * Thus, if a equals b --> clear all if a is a subset of b, then --> b if b is * a subset of a, then --> a not b if a only intersects with b, then --> a or * b if a does not intersect with b, then a or b * * In "toggle" mode, when you click on any atom of the molecule, you want * either: * * (a) all the atoms in the molecule to be displayed if not all are already * displayed, or * * (b) the whole molecule to be hidden if all the atoms of the molecule are * already displayed. * * @param a * @param b * @return a handy pointer to the working set, a */ public static BitSet toggleInPlace(BitSet a, BitSet b) { if (a.equals(b)) { // all on -- toggle all off a.clear(); } else if (andNot(copy(b), a).length() == 0) { // b is a subset of a -> remove all b bits from a andNot(a, b); } else { // may or may not be some overlap // combine a and b a.or(b); } return a; } public static BitSet andNot(BitSet a, BitSet b) { /** * 时代Java公众号 - nowjava.com 提 供 **/ if (b != nul