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queens.cpp

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00001 /* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
00002 /*
00003  *  Main authors:
00004  *     Christian Schulte <schulte@gecode.org>
00005  *
00006  *  Copyright:
00007  *     Christian Schulte, 2001
00008  *
00009  *  This file is part of Gecode, the generic constraint
00010  *  development environment:
00011  *     http://www.gecode.org
00012  *
00013  *  Permission is hereby granted, free of charge, to any person obtaining
00014  *  a copy of this software and associated documentation files (the
00015  *  "Software"), to deal in the Software without restriction, including
00016  *  without limitation the rights to use, copy, modify, merge, publish,
00017  *  distribute, sublicense, and/or sell copies of the Software, and to
00018  *  permit persons to whom the Software is furnished to do so, subject to
00019  *  the following conditions:
00020  *
00021  *  The above copyright notice and this permission notice shall be
00022  *  included in all copies or substantial portions of the Software.
00023  *
00024  *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
00025  *  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
00026  *  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
00027  *  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
00028  *  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
00029  *  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
00030  *  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
00031  *
00032  */
00033 
00034 #include <gecode/driver.hh>
00035 #include <gecode/int.hh>
00036 #include <gecode/minimodel.hh>
00037 
00038 #if defined(GECODE_HAS_QT) && defined(GECODE_HAS_GIST)
00039 #include <QtGui>
00040 #if QT_VERSION >= 0x050000
00041 #include <QtWidgets>
00042 #endif
00043 #endif
00044 
00045 using namespace Gecode;
00046 
00056 class Queens : public Script {
00057 public:
00059   IntVarArray q;
00061   enum {
00062     PROP_BINARY,  
00063     PROP_MIXED,   
00064     PROP_DISTINCT 
00065   };
00067   Queens(const SizeOptions& opt)
00068     : Script(opt), q(*this,opt.size(),0,opt.size()-1) {
00069     const int n = q.size();
00070     switch (opt.propagation()) {
00071     case PROP_BINARY:
00072       for (int i = 0; i<n; i++)
00073         for (int j = i+1; j<n; j++) {
00074           rel(*this, q[i] != q[j]);
00075           rel(*this, q[i]+i != q[j]+j);
00076           rel(*this, q[i]-i != q[j]-j);
00077         }
00078       break;
00079     case PROP_MIXED:
00080       for (int i = 0; i<n; i++)
00081         for (int j = i+1; j<n; j++) {
00082           rel(*this, q[i]+i != q[j]+j);
00083           rel(*this, q[i]-i != q[j]-j);
00084         }
00085       distinct(*this, q, opt.ipl());
00086       break;
00087     case PROP_DISTINCT:
00088       distinct(*this, IntArgs::create(n,0,1), q, opt.ipl());
00089       distinct(*this, IntArgs::create(n,0,-1), q, opt.ipl());
00090       distinct(*this, q, opt.ipl());
00091       break;
00092     }
00093     branch(*this, q, INT_VAR_SIZE_MIN(), INT_VAL_MIN());
00094   }
00095 
00097   Queens(Queens& s) : Script(s) {
00098     q.update(*this, s.q);
00099   }
00100 
00102   virtual Space*
00103   copy(void) {
00104     return new Queens(*this);
00105   }
00106 
00108   virtual void
00109   print(std::ostream& os) const {
00110     os << "queens\t";
00111     for (int i = 0; i < q.size(); i++) {
00112       os << q[i] << ", ";
00113       if ((i+1) % 10 == 0)
00114         os << std::endl << "\t";
00115     }
00116     os << std::endl;
00117   }
00118 };
00119 
00120 #if defined(GECODE_HAS_QT) && defined(GECODE_HAS_GIST)
00121 
00122 class QueensInspector : public Gist::Inspector {
00123 protected:
00125   QGraphicsScene* scene;
00127   QMainWindow* mw;
00129   static const int unit = 20;
00130 public:
00132   QueensInspector(void) : scene(NULL), mw(NULL) {}
00134   virtual void inspect(const Space& s) {
00135     const Queens& q = static_cast<const Queens&>(s);
00136 
00137     if (!scene)
00138       initialize();
00139     QList <QGraphicsItem*> itemList = scene->items();
00140     foreach (QGraphicsItem* i, scene->items()) {
00141       scene->removeItem(i);
00142       delete i;
00143     }
00144 
00145     for (int i=0; i<q.q.size(); i++) {
00146       for (int j=0; j<q.q.size(); j++) {
00147         scene->addRect(i*unit,j*unit,unit,unit);
00148       }
00149       QBrush b(q.q[i].assigned() ? Qt::black : Qt::red);
00150       QPen p(q.q[i].assigned() ? Qt::black : Qt::white);
00151       for (IntVarValues xv(q.q[i]); xv(); ++xv) {
00152         scene->addEllipse(QRectF(i*unit+unit/4,xv.val()*unit+unit/4,
00153                                  unit/2,unit/2), p, b);
00154       }
00155     }
00156     mw->show();
00157   }
00158 
00160   void initialize(void) {
00161     mw = new QMainWindow();
00162     scene = new QGraphicsScene();
00163     QGraphicsView* view = new QGraphicsView(scene);
00164     view->setRenderHints(QPainter::Antialiasing);
00165     mw->setCentralWidget(view);
00166     mw->setAttribute(Qt::WA_QuitOnClose, false);
00167     mw->setAttribute(Qt::WA_DeleteOnClose, false);
00168     QAction* closeWindow = new QAction("Close window", mw);
00169     closeWindow->setShortcut(QKeySequence("Ctrl+W"));
00170     mw->connect(closeWindow, SIGNAL(triggered()),
00171                 mw, SLOT(close()));
00172     mw->addAction(closeWindow);
00173   }
00174 
00176   virtual std::string name(void) { return "Board"; }
00178   virtual void finalize(void) {
00179     delete mw;
00180     mw = NULL;
00181   }
00182 };
00183 
00184 #endif /* GECODE_HAS_GIST */
00185 
00189 int
00190 main(int argc, char* argv[]) {
00191   SizeOptions opt("Queens");
00192   opt.iterations(500);
00193   opt.size(100);
00194   opt.propagation(Queens::PROP_DISTINCT);
00195   opt.propagation(Queens::PROP_BINARY, "binary",
00196                       "only binary disequality constraints");
00197   opt.propagation(Queens::PROP_MIXED, "mixed",
00198                       "single distinct and binary disequality constraints");
00199   opt.propagation(Queens::PROP_DISTINCT, "distinct",
00200                       "three distinct constraints");
00201 
00202 #if defined(GECODE_HAS_QT) && defined(GECODE_HAS_GIST)
00203   QueensInspector ki;
00204   opt.inspect.click(&ki);
00205 #endif
00206 
00207   opt.parse(argc,argv);
00208   Script::run<Queens,DFS,SizeOptions>(opt);
00209   return 0;
00210 }
00211 
00212 // STATISTICS: example-any
00213