DGtal  1.0.0
exampleInHalfPlane.cpp File Reference
#include <iostream>
#include "DGtal/base/Common.h"
#include "DGtal/kernel/SpaceND.h"
#include "DGtal/kernel/domains/HyperRectDomain.h"
#include "DGtal/geometry/tools/determinant/Simple2x2DetComputer.h"
#include "DGtal/geometry/tools/determinant/SimpleIncremental2x2DetComputer.h"
#include "DGtal/geometry/tools/determinant/AvnaimEtAl2x2DetSignComputer.h"
#include "DGtal/geometry/tools/determinant/Filtered2x2DetComputer.h"
#include "DGtal/geometry/tools/determinant/InHalfPlaneBy2x2DetComputer.h"
#include "DGtal/geometry/tools/determinant/PredicateFromOrientationFunctor2.h"
#include "DGtal/geometry/tools/determinant/InHalfPlaneBySimple3x3Matrix.h"
Include dependency graph for exampleInHalfPlane.cpp:

Go to the source code of this file.

## Functions

bool basicUsage ()

int main (int argc, char **argv)

## Detailed Description

This program is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program. If not, see http://www.gnu.org/licenses/.

Date
2013/11/28

An example file named exampleInHalfPlane.

This file is part of the DGtal library.

Definition in file exampleInHalfPlane.cpp.

## Function Documentation

[FunctorDefinition30]

[FunctorDefinition30]

[FunctorDefinition52]

[FunctorDefinition52]

[FunctorDefinition62]

[FunctorDefinition62]

[FunctorDefinition62bis]

[FunctorDefinition62bis]

[FunctorDefinition62plus]

[FunctorDefinition62plus]

Examples
geometry/tools/determinant/exampleInHalfPlane.cpp.

Definition at line 112 of file exampleInHalfPlane.cpp.

113 {
114  {
116  //for coordinates of 30 (not zero) bits
120  Functor *a = new Functor();
121  BOOST_VERIFY(a);
122  delete a;
123  }
124
125  {
127  //for coordinates of 52 (not zero) bits
129  typedef AvnaimEtAl2x2DetSignComputer<double> DetComputer;
130  typedef Filtered2x2DetComputer<DetComputer> FDetComputer;
133  Functor *a = new Functor();
134  BOOST_VERIFY(a);
135  delete a;
136  //NB. using double as coordinate type is slightly faster than using DGtal::int64_t
137  //typedef PointVector<2, double> Point;
138  }
139
140  {
142  //for coordinates of 62 (not zero) bits
147  Functor *a= new Functor();
148  BOOST_VERIFY( a);
149  delete a;
150  }
151
152  {
154  //for coordinates of 62 (not zero) bits
155  //if long double is implemented as the 80-bit extended precision type
157  typedef AvnaimEtAl2x2DetSignComputer<long double> DetComputer;
158  typedef Filtered2x2DetComputer<DetComputer> FDetComputer;
160  Functor *a = new Functor();
161  BOOST_VERIFY(a == a);
163  delete a;
164  }
165
166 #ifdef WITH_BIGINTEGER
167  {
169  //for arbitrary coordinates
171  typedef Simple2x2DetComputer<DGtal::BigInteger> DetComputer;
173  Functor *a= new Functor();
174  BOOST_VERIFY( a);
176  delete a;
177  }
178 #endif
179
180 }
InHalfPlaneBySimple3x3Matrix< Point, double > Functor
Aim: Class that provides a way of computing the sign of the determinant of a 2x2 matrix from its four...
Aim: Implements basic operations that will be used in Point and Vector classes.
Definition: PointVector.h:165
Aim: Small class useful to compute the determinant of a 2x2 matrix from its four coefficients,...
Aim: Class that implements an orientation functor, ie. it provides a way to compute the orientation o...
MyPointD Point
Definition: testClone2.cpp:383
Aim: Class that provides a way of computing the sign of the determinant of a 2x2 matrix from its four...
Aim: Class that implements an orientation functor, ie. it provides a way to compute the orientation o...

Referenced by main().

## ◆ basicUsage()

 bool basicUsage ( )

[DomainDefinition]

[DomainDefinition]

[ProblemStatement]

[ProblemStatement]

[FunctorDefinition]

[FunctorDefinition]

[PredicateDefinition]

[PredicateDefinition]

[FunctorInitialization]

[FunctorInitialization]

[PredicateUsage]

[PredicateUsage]

Definition at line 62 of file exampleInHalfPlane.cpp.

63 {
65  //domain definition
66  typedef SpaceND< 2, DGtal::int16_t > DigitalSpace;
68  typedef Domain::Point Point;
69  Domain domain( Point(-32767,-32767), Point(32767,32767) );
71
73  Point P, Q, R;
74  P = Point(0,0);
75  Q = Point(5,2);
76  R = Point(2,1);
77  //problem: are P, Q, R counter-clockwise oriented ?
79
81  //orientation functor
82  typedef InHalfPlaneBySimple3x3Matrix<Point, DGtal::int32_t> OrientationFunctor;
83  OrientationFunctor orientationFunctor;
85
87  //geometric predicate
89  pointPredicate( orientationFunctor );
91
93  //initialization
94  pointPredicate.init( P, Q );
95  //which is equivalent to
96  //orientationFunctor.init( P, Q );
97  //because the predicate stores a pointer to the functor
99
100  bool isCCW;
102  //decision
103  isCCW = pointPredicate( R );
104  //which is equivalent to the following shortcut:
105  //isCCW = pointPredicate( P, Q, R );
107
108  return isCCW;
109 }
HyperRectDomain< Space > Domain
Aim: Parallelepidec region of a digital space, model of a 'CDomain'.
Domain domain
Aim: Small adapter to models of COrientationFunctor2. It is a model of concepts::CPointPredicate....
MyPointD Point
Definition: testClone2.cpp:383
Aim: Class that implements an orientation functor, ie. it provides a way to compute the orientation o...

Referenced by main().

## ◆ main()

 int main ( int argc, char ** argv )

Definition at line 182 of file exampleInHalfPlane.cpp.

183 {
184  trace.beginBlock ( "Example exampleInHalfPlane" );
185  trace.info() << "Args:";
186  for ( int i = 0; i < argc; ++i )
187  trace.info() << " " << argv[ i ];
188  trace.info() << endl;
189
190  basicUsage();