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archimedean-spiral.cpp
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1 /* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
2 /*
3  * Main authors:
4  * Vincent Barichard <Vincent.Barichard@univ-angers.fr>
5  *
6  * Copyright:
7  * Vincent Barichard, 2012
8  *
9  * This file is part of Gecode, the generic constraint
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33 
34 #include <gecode/driver.hh>
35 
36 #include <gecode/minimodel.hh>
37 #include <gecode/float.hh>
38 
39 using namespace Gecode;
40 
68 protected:
71 public:
74  : FloatMaximizeScript(opt), f(*this,4,-20,20) {
75  // Post equation
76  FloatVar theta = f[0];
77  FloatVar r = f[3];
78  FloatVar x = f[1];
79  FloatVar y = f[2];
80 
81  rel(*this, theta >= 0);
82  rel(*this, theta <= 6*FloatVal::pi());
83  rel(*this, r >= 0);
84  rel(*this, r*cos(theta) == x);
85  rel(*this, r*sin(theta) == y);
86  rel(*this, r == theta);
87 
88  branch(*this,f[0],FLOAT_VAL_SPLIT_MIN());
89  }
93  f.update(*this, p.f);
94  }
96  virtual Space* copy(void) {
97  return new ArchimedeanSpiral(*this);
98  }
100  virtual FloatVar cost(void) const {
101  return f[0];
102  }
104  virtual void print(std::ostream& os) const {
105  os << "XY " << f[1].med() << " " << f[2].med()
106  << std::endl;
107  }
108 
109 };
110 
114 int main(int argc, char* argv[]) {
115  Options opt("ArchimedeanSpiral");
116  opt.solutions(0);
117  opt.step(0.1);
118  opt.parse(argc,argv);
119  FloatMaximizeScript::run<ArchimedeanSpiral,BAB,Options>(opt);
120  return 0;
121 }
122 
123 // STATISTICS: example-any
int p
Number of positive literals for node type.
Definition: bool-expr.cpp:232
Node * x
Pointer to corresponding Boolean expression node.
Definition: bool-expr.cpp:249
NNF * r
Right subtree.
Definition: bool-expr.cpp:242
Example: Archimedean spiral
ArchimedeanSpiral(ArchimedeanSpiral &p)
Constructor for cloning p.
virtual Space * copy(void)
Copy during cloning.
int main(int argc, char *argv[])
Main-function.
FloatVarArray f
The numbers.
ArchimedeanSpiral(const Options &opt)
Actual model.
virtual void print(std::ostream &os) const
Print solution coordinates.
virtual FloatVar cost(void) const
Cost function.
void parse(int &argc, char *argv[])
Parse options from arguments argv (number is argc)
Definition: options.cpp:548
Parametric base-class for scripts.
Definition: driver.hh:729
static FloatVal pi(void)
Return lower bound of .
Definition: val.hpp:114
Float variable array.
Definition: float.hh:1030
Float variables.
Definition: float.hh:870
Options for scripts
Definition: driver.hh:366
void solutions(unsigned int n)
Set default number of solutions to search for.
Definition: options.hpp:283
void step(double s)
Set default step value.
Definition: options.hpp:256
Computation spaces.
Definition: core.hpp:1742
FloatValBranch FLOAT_VAL_SPLIT_MIN(void)
Select values not greater than mean of smallest and largest value.
Definition: val.hpp:55
void sin(Home home, FloatVar x0, FloatVar x1)
Post propagator for .
void cos(Home home, FloatVar x0, FloatVar x1)
Post propagator for .
Post propagator for SetVar SetOpType SetVar y
Definition: set.hh:767
void rel(Home home, FloatVar x0, FloatRelType frt, FloatVal n)
Propagates .
Definition: rel.cpp:43
Options opt
The options.
Definition: test.cpp:97