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golden-spiral.cpp
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00001 /* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
00002 /*
00003  *  Main authors:
00004  *     Vincent Barichard <Vincent.Barichard@univ-angers.fr>
00005  *
00006  *  Copyright:
00007  *     Vincent Barichard, 2012
00008  *
00009  *  Last modified:
00010  *     $Date: 2013-07-08 14:22:40 +0200 (Mon, 08 Jul 2013) $ by $Author: schulte $
00011  *     $Revision: 13820 $
00012  *
00013  *  This file is part of Gecode, the generic constraint
00014  *  development environment:
00015  *     http://www.gecode.org
00016  *
00017  *  Permission is hereby granted, free of charge, to any person obtaining
00018  *  a copy of this software and associated documentation files (the
00019  *  "Software"), to deal in the Software without restriction, including
00020  *  without limitation the rights to use, copy, modify, merge, publish,
00021  *  distribute, sublicense, and/or sell copies of the Software, and to
00022  *  permit persons to whom the Software is furnished to do so, subject to
00023  *  the following conditions:
00024  *
00025  *  The above copyright notice and this permission notice shall be
00026  *  included in all copies or substantial portions of the Software.
00027  *
00028  *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
00029  *  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
00030  *  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
00031  *  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
00032  *  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
00033  *  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
00034  *  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
00035  *
00036  */
00037 
00038 #include <gecode/driver.hh>
00039 
00040 #include <gecode/minimodel.hh>
00041 #include <gecode/float.hh>
00042 
00043 using namespace Gecode;
00044 
00081 class GoldenSpiral : public Script {
00082 protected:
00084   FloatVarArray f;
00086   FloatNum step;
00087 public:
00089   GoldenSpiral(const Options&) 
00090     : f(*this,4,-20,20), step(0.1) {
00091     // Post equation
00092     FloatVar theta = f[0];
00093     FloatVar r = f[3];
00094     FloatVar x = f[1];
00095     FloatVar y = f[2];
00096     rel(*this, theta >= 0);
00097     rel(*this, r >= 0);
00098     rel(*this, r*cos(theta) == x);
00099     rel(*this, r*sin(theta) == y);
00100     rel(*this, exp(0.30649*theta) == r);
00101 
00102     branch(*this,theta,FLOAT_VAL_SPLIT_MIN());
00103   }
00105   GoldenSpiral(bool share, GoldenSpiral& p) 
00106     : Script(share,p), step(p.step) {
00107     f.update(*this,share,p.f);
00108   }
00110   virtual Space* copy(bool share) { 
00111     return new GoldenSpiral(share,*this); 
00112   }
00114   virtual void constrain(const Space& _b) {
00115     const GoldenSpiral& b = static_cast<const GoldenSpiral&>(_b);
00116     rel(*this, f[0] >= (b.f[0].max()+step));
00117   }
00119   virtual void print(std::ostream& os) const {
00120     os << "XY " << f[1].med() << " " << f[2].med()
00121        << std::endl;
00122   }
00123 
00124 };
00125 
00129 int main(int argc, char* argv[]) {
00130   Options opt("GoldenSpiral");
00131   opt.parse(argc,argv);
00132   opt.solutions(0);
00133   Script::run<GoldenSpiral,BAB,Options>(opt);
00134   return 0;
00135 }
00136 
00137 // STATISTICS: example-any