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cartesian-heart.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
10 * development environment:
11 * http://www.gecode.org
12 *
13 * Permission is hereby granted, free of charge, to any person obtaining
14 * a copy of this software and associated documentation files (the
15 * "Software"), to deal in the Software without restriction, including
16 * without limitation the rights to use, copy, modify, merge, publish,
17 * distribute, sublicense, and/or sell copies of the Software, and to
18 * permit persons to whom the Software is furnished to do so, subject to
19 * the following conditions:
20 *
21 * The above copyright notice and this permission notice shall be
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27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
28 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
29 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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31 *
32 */
33
34#include <gecode/driver.hh>
35
36#include <gecode/minimodel.hh>
37#include <gecode/float.hh>
38
39using namespace Gecode;
40
63class CartesianHeart : public Script {
64protected:
69public:
72 : Script(opt), f(*this,2,-20,20), step(opt.step()) {
73 int q = 2;
74 FloatNum p = 0.5;
75 // Post equation
76 rel(*this, sqr(f[0]) + 2*sqr(f[1]-p*nroot(abs(f[0]),q)) == 1);
77 branch(*this, f[0], FLOAT_VAL_SPLIT_MIN());
78 branch(*this, f[1], FLOAT_VAL_SPLIT_MIN());
79 }
82 : Script(p), step(p.step) {
83 f.update(*this, p.f);
84 }
86 virtual Space* copy(void) {
87 return new CartesianHeart(*this);
88 }
90 virtual void constrain(const Space& _b) {
91 const CartesianHeart& b = static_cast<const CartesianHeart&>(_b);
92 rel(*this,
93 (f[0] >= (b.f[0].max()+step)) ||
94 (f[1] >= (b.f[1].max()+step)) ||
95 (f[1] <= (b.f[1].min()-step)));
96 }
98 virtual void print(std::ostream& os) const {
99 os << "XY " << f[0].med() << " " << f[1].med()
100 << std::endl;
101 }
102
103};
104
108int main(int argc, char* argv[]) {
109 Options opt("CartesianHeart");
110 opt.solutions(0);
111 opt.step(0.01);
112 opt.parse(argc,argv);
114 return 0;
115}
116
117// STATISTICS: example-any
struct Gecode::@603::NNF::@65::@66 b
For binary nodes (and, or, eqv)
int p
Number of positive literals for node type.
Example: Cartesian Heart
virtual Space * copy(void)
Copy during cloning.
int main(int argc, char *argv[])
Main-function.
CartesianHeart(const Options &opt)
Actual model.
CartesianHeart(CartesianHeart &p)
Constructor for cloning p.
virtual void print(std::ostream &os) const
Print solution coordinates.
FloatNum step
Minimum distance between two solutions.
virtual void constrain(const Space &_b)
Add constraints to current model to get next solution (not too close)
FloatVarArray f
The numbers.
Parametric base-class for scripts.
Definition driver.hh:729
static void run(const Options &opt, Script *s=NULL)
Definition script.hpp:290
Float variable array.
Definition float.hh:1030
Options for scripts
Definition driver.hh:366
Computation spaces.
Definition core.hpp:1742
void update(Space &home, VarArray< Var > &a)
Update array to be a clone of array a.
Definition array.hpp:1013
void parse(int argc, char *argv[])
Parse commandline arguments.
Definition test.cpp:120
void branch(Home home, const FloatVarArgs &x, FloatVarBranch vars, FloatValBranch vals, FloatBranchFilter bf=nullptr, FloatVarValPrint vvp=nullptr)
Branch over x with variable selection vars and value selection vals.
Definition branch.cpp:39
void rel(Home home, FloatVar x0, FloatRelType frt, FloatVar x1)
Post propagator for .
Definition rel.cpp:68
double FloatNum
Floating point number base type.
Definition float.hh:106
Gecode toplevel namespace
void sqr(Home home, FloatVar x0, FloatVar x1)
Post propagator for .
void abs(Home home, FloatVar x0, FloatVar x1)
Post propagator for .
void nroot(Home home, FloatVar x0, int n, FloatVar x1)
Post propagator for for $n\geq 0$.
FloatValBranch FLOAT_VAL_SPLIT_MIN(void)
Select values not greater than mean of smallest and largest value.
Definition val.hpp:55