DGtal  0.9.2
Filtered2x2DetComputer.ih
1 /**
2  * This program is free software: you can redistribute it and/or modify
3  * it under the terms of the GNU Lesser General Public License as
4  * published by the Free Software Foundation, either version 3 of the
5  * License, or (at your option) any later version.
6  *
7  * This program is distributed in the hope that it will be useful,
8  * but WITHOUT ANY WARRANTY; without even the implied warranty of
9  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
10  * GNU General Public License for more details.
11  *
12  * You should have received a copy of the GNU General Public License
13  * along with this program. If not, see <http://www.gnu.org/licenses/>.
14  *
15  **/
16 
17 /**
18  * @file Filtered2x2DetComputer.ih
19  * @author Tristan Roussillon (\c tristan.roussillon@liris.cnrs.fr )
20  * Laboratoire d'InfoRmatique en Image et Systèmes d'information - LIRIS (CNRS, UMR 5205), CNRS, France
21  *
22  * @date 2013/11/20
23  *
24  * Implementation of inline methods defined in Filtered2x2DetComputer.h
25  *
26  * This file is part of the DGtal library.
27  */
28 
29 
30 //////////////////////////////////////////////////////////////////////////////
31 #include <cstdlib>
32 //////////////////////////////////////////////////////////////////////////////
33 
34 ///////////////////////////////////////////////////////////////////////////////
35 // IMPLEMENTATION of inline methods.
36 ///////////////////////////////////////////////////////////////////////////////
37 
38 ///////////////////////////////////////////////////////////////////////////////
39 // ----------------------------------------------------------------------------
40 
41 
42 ///////////////////////////////////////////////////////////////////////////////
43 // Interface - public :
44 
45 // ----------------------------------------------------------------------------
46 template <typename T>
47 inline
48 void
49 DGtal::Filtered2x2DetComputer<T>::init(const ArgumentInteger& aA, const ArgumentInteger& aB)
50 {
51  myA = aA;
52  myB = aB;
53 }
54 
55 // ----------------------------------------------------------------------------
56 template <typename T>
57 inline
58 typename DGtal::Filtered2x2DetComputer<T>::ResultInteger
59 DGtal::Filtered2x2DetComputer<T>::operator()(const ArgumentInteger& aX, const ArgumentInteger& aY) const
60 {
61  ArgumentInteger det = (myA*aY - myB*aX);
62  if ( det != 0.0 )
63  { //if not zero, we can conclude because of the IEC-559 / IEEE-754 standard.
64  return (det > 0.0) ? NumberTraits<ResultInteger>::ONE : -NumberTraits<ResultInteger>::ONE;
65  }
66  else
67  { //otherwise, we must use another method.
68  myDetComputer.init(myA, myB);
69  return myDetComputer.operator()(aX, aY);
70  }
71 }
72 
73 // ----------------------------------------------------------------------------
74 template <typename T>
75 inline
76 typename DGtal::Filtered2x2DetComputer<T>::ResultInteger
77 DGtal::Filtered2x2DetComputer<T>::operator()(const ArgumentInteger& aA, const ArgumentInteger& aB,
78  const ArgumentInteger& aX, const ArgumentInteger& aY)
79 {
80  init(aA, aB);
81  return operator()(aX, aY);
82 }
83 
84 // ----------------------------------------------------------------------------
85 template <typename T>
86 inline
87 void
88 DGtal::Filtered2x2DetComputer<T>::selfDisplay ( std::ostream & out ) const
89 {
90  out << "[Filtered2x2DetComputer]";
91 }
92 
93 // ----------------------------------------------------------------------------
94 template <typename T>
95 inline
96 bool
97 DGtal::Filtered2x2DetComputer<T>::isValid() const
98 {
99  return true;
100 }
101 
102 
103 
104 ///////////////////////////////////////////////////////////////////////////////
105 // Implementation of inline functions //
106 
107 template <typename T>
108 inline
109 std::ostream&
110 DGtal::operator<< ( std::ostream & out,
111  const Filtered2x2DetComputer<T> & object )
112 {
113  object.selfDisplay( out );
114  return out;
115 }
116 
117 // //
118 ///////////////////////////////////////////////////////////////////////////////
119 
120