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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
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9  * Last modified:
10  * $Date: 2013-07-08 14:22:40 +0200 (Mon, 08 Jul 2013) $ by $Author: schulte $
11  * $Revision: 13820 $
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37 
38 #include <gecode/driver.hh>
39 
40 #include <gecode/minimodel.hh>
41 #include <gecode/float.hh>
42 
43 using namespace Gecode;
44 
81 class GoldenSpiral : public Script {
82 protected:
87 public:
90  : f(*this,4,-20,20), step(0.1) {
91  // Post equation
92  FloatVar theta = f[0];
93  FloatVar r = f[3];
94  FloatVar x = f[1];
95  FloatVar y = f[2];
96  rel(*this, theta >= 0);
97  rel(*this, r >= 0);
98  rel(*this, r*cos(theta) == x);
99  rel(*this, r*sin(theta) == y);
100  rel(*this, exp(0.30649*theta) == r);
101 
102  branch(*this,theta,FLOAT_VAL_SPLIT_MIN());
103  }
105  GoldenSpiral(bool share, GoldenSpiral& p)
106  : Script(share,p), step(p.step) {
107  f.update(*this,share,p.f);
108  }
110  virtual Space* copy(bool share) {
111  return new GoldenSpiral(share,*this);
112  }
114  virtual void constrain(const Space& _b) {
115  const GoldenSpiral& b = static_cast<const GoldenSpiral&>(_b);
116  rel(*this, f[0] >= (b.f[0].max()+step));
117  }
119  virtual void print(std::ostream& os) const {
120  os << "XY " << f[1].med() << " " << f[2].med()
121  << std::endl;
122  }
123 
124 };
125 
129 int main(int argc, char* argv[]) {
130  Options opt("GoldenSpiral");
131  opt.parse(argc,argv);
132  opt.solutions(0);
133  Script::run<GoldenSpiral,BAB,Options>(opt);
134  return 0;
135 }
136 
137 // STATISTICS: example-any
virtual void print(std::ostream &os) const
Print solution coordinates.
const Gecode::FloatNum step
Definition: arithmetic.cpp:789
GoldenSpiral(const Options &)
Actual model.
FloatVarArray f
The numbers.
FloatNum step
Minimum distance between two solutions.
Float variable array.
Definition: float.hh:1016
Computation spaces.
Definition: core.hpp:1362
Parametric base-class for scripts.
Definition: driver.hh:622
void update(Space &, bool share, VarArray< Var > &a)
Update array to be a clone of array a.
Definition: array.hpp:1072
int main(int argc, char *argv[])
Main-function.
int p
Number of positive literals for node type.
Definition: bool-expr.cpp:236
Options opt
The options.
Definition: test.cpp:101
NNF * r
Right subtree.
Definition: bool-expr.cpp:246
virtual Space * copy(bool share)
Copy during cloning.
virtual void constrain(const Space &_b)
Add constraint to current model to get next solution (not too close)
FloatValBranch FLOAT_VAL_SPLIT_MIN(void)
Select values not greater than mean of smallest and largest value.
Definition: val.hpp:59
Single _b(1, 4)
void parse(int &argc, char *argv[])
Parse options from arguments argv (number is argc)
Definition: options.cpp:331
void cos(Home home, FloatVar x0, FloatVar x1)
Post propagator for .
Definition: arithmetic.cpp:196
Example: Golden spiral
Node * x
Pointer to corresponding Boolean expression node.
Definition: bool-expr.cpp:253
void rel(Home home, FloatVar x0, FloatRelType frt, FloatVal n)
Propagates .
Definition: rel.cpp:47
void solutions(unsigned int n)
Set default number of solutions to search for.
Definition: options.hpp:243
Float variables.
Definition: float.hh:857
struct Gecode::@518::NNF::@57::@58 b
For binary nodes (and, or, eqv)
Gecode toplevel namespace
void sin(Home home, FloatVar x0, FloatVar x1)
Post propagator for .
Definition: arithmetic.cpp:182
BrancherHandle 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:43
GoldenSpiral(bool share, GoldenSpiral &p)
Constructor for cloning p.
void exp(Home home, FloatVar x0, FloatVar x1)
Post propagator for .
Definition: arithmetic.cpp:144
double FloatNum
Floating point number base type.
Definition: float.hh:108
Options for scripts
Definition: driver.hh:326