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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
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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31 *
32 */
33
34#include <gecode/driver.hh>
35
36#include <gecode/minimodel.hh>
37#include <gecode/float.hh>
38
39using namespace Gecode;
40
78protected:
81public:
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 }
98
101 f.update(*this, p.f);
102 }
103
104 virtual Space* copy(void) {
105 return new GoldenSpiral(*this);
106 }
107
108 virtual FloatVar cost(void) const {
109 return f[0];
110 }
111
112 virtual void print(std::ostream& os) const {
113 os << "XY " << f[1].med() << " " << f[2].med()
114 << std::endl;
115 }
116
117};
118
122int main(int argc, char* argv[]) {
123 Options opt("GoldenSpiral");
124 opt.solutions(0);
125 opt.step(0.1);
126 opt.parse(argc,argv);
128 return 0;
129}
130
131// STATISTICS: example-any
Float variable array.
Definition float.hh:1033
Float variables.
Definition float.hh:870
Options for scripts
Definition driver.hh:366
Computation spaces.
Definition core.hpp:1744
int main(int argc, char *argv[])
Main-function.
virtual Space * copy(void)
Copy during cloning.
virtual void print(std::ostream &os) const
Print solution coordinates.
FloatVarArray f
The numbers.
GoldenSpiral(GoldenSpiral &p)
Constructor for cloning p.
GoldenSpiral(const Options &opt)
Actual model.
virtual FloatVar cost(void) const
Cost function.
void parse(int argc, char *argv[])
Parse commandline arguments.
Definition test.cpp:120
Driver::ScriptBase< Driver::ExtractStepOption< FloatMaximizeSpace > > FloatMaximizeScript
Base-class for scripts for finding solution of highest float cost.
Definition driver.hh:842
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
Gecode toplevel namespace
void sin(Home home, FloatVar x0, FloatVar x1)
Post propagator for .
Post propagator for SetVar SetOpType SetVar SetRelType r
Definition set.hh:773
void cos(Home home, FloatVar x0, FloatVar x1)
Post propagator for .
Post propagator for SetVar SetOpType SetVar y
Definition set.hh:773
void exp(Home home, FloatVar x0, FloatVar x1)
Post propagator for .
Post propagator for SetVar x
Definition set.hh:773
FloatValBranch FLOAT_VAL_SPLIT_MIN(void)
Select values not greater than mean of smallest and largest value.
Definition val.hpp:55