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golden-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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11  * http://www.gecode.org
12  *
13  * Permission is hereby granted, free of charge, to any person obtaining
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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 
78 protected:
81 public:
84  : FloatMaximizeScript(opt), f(*this,4,-20,20) {
85  // Post equation
86  FloatVar theta = f[0];
87  FloatVar r = f[3];
88  FloatVar x = f[1];
89  FloatVar y = f[2];
90  rel(*this, theta >= 0);
91  rel(*this, r >= 0);
92  rel(*this, r*cos(theta) == x);
93  rel(*this, r*sin(theta) == y);
94  rel(*this, exp(0.30649*theta) == r);
95 
96  branch(*this,theta,FLOAT_VAL_SPLIT_MIN());
97  }
100  : FloatMaximizeScript(p) {
101  f.update(*this, p.f);
102  }
104  virtual Space* copy(void) {
105  return new GoldenSpiral(*this);
106  }
108  virtual FloatVar cost(void) const {
109  return f[0];
110  }
112  virtual void print(std::ostream& os) const {
113  os << "XY " << f[1].med() << " " << f[2].med()
114  << std::endl;
115  }
116 
117 };
118 
122 int main(int argc, char* argv[]) {
123  Options opt("GoldenSpiral");
124  opt.solutions(0);
125  opt.step(0.1);
126  opt.parse(argc,argv);
127  FloatMaximizeScript::run<GoldenSpiral,BAB,Options>(opt);
128  return 0;
129 }
130 
131 // STATISTICS: example-any
GoldenSpiral(GoldenSpiral &p)
Constructor for cloning p.
void branch(Home home, const FloatVarArgs &x, FloatVarBranch vars, FloatValBranch vals, FloatBranchFilter bf, FloatVarValPrint vvp)
Branch over x with variable selection vars and value selection vals.
Definition: branch.cpp:39
void update(Space &home, VarArray< Var > &a)
Update array to be a clone of array a.
Definition: array.hpp:995
FloatVarArray f
The numbers.
Float variable array.
Definition: float.hh:1030
Computation spaces.
Definition: core.hpp:1701
Parametric base-class for scripts.
Definition: driver.hh:729
virtual Space * copy(void)
Copy during cloning.
int main(int argc, char *argv[])
Main-function.
int p
Number of positive literals for node type.
Definition: bool-expr.cpp:232
Options opt
The options.
Definition: test.cpp:97
virtual FloatVar cost(void) const
Cost function.
void step(double s)
Set default step value.
Definition: options.hpp:256
FloatValBranch FLOAT_VAL_SPLIT_MIN(void)
Select values not greater than mean of smallest and largest value.
Definition: val.hpp:55
Post propagator for SetVar SetOpType SetVar SetRelType r
Definition: set.hh:767
void parse(int &argc, char *argv[])
Parse options from arguments argv (number is argc)
Definition: options.cpp:540
void cos(Home home, FloatVar x0, FloatVar x1)
Post propagator for .
Post propagator for SetVar SetOpType SetVar y
Definition: set.hh:767
Example: Golden spiral
void rel(Home home, FloatVar x0, FloatRelType frt, FloatVal n)
Propagates .
Definition: rel.cpp:43
GoldenSpiral(const Options &opt)
Actual model.
void solutions(unsigned int n)
Set default number of solutions to search for.
Definition: options.hpp:283
Post propagator for SetVar x
Definition: set.hh:767
Float variables.
Definition: float.hh:870
Gecode toplevel namespace
void sin(Home home, FloatVar x0, FloatVar x1)
Post propagator for .
void exp(Home home, FloatVar x0, FloatVar x1)
Post propagator for .
Options for scripts
Definition: driver.hh:366
virtual void print(std::ostream &os) const
Print solution coordinates.