DGtal  1.3.beta
FPLengthEstimator.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 FPLengthEstimator.ih
19  * @author Tristan Roussillon (\c
20  * tristan.roussillon@liris.cnrs.fr ) Laboratoire d'InfoRmatique en
21  * Image et Systèmes d'information - LIRIS (CNRS, UMR 5205), CNRS,
22  * France
23  *
24  *
25  * @date 2011/07/07
26  *
27  * Implementation of inline methods defined in FPLengthEstimator.h
28  *
29  * This file is part of the DGtal library.
30  */
31 
32 
33 //////////////////////////////////////////////////////////////////////////////
34 #include <cstdlib>
35 //////////////////////////////////////////////////////////////////////////////
36 
37 ///////////////////////////////////////////////////////////////////////////////
38 // IMPLEMENTATION of inline methods.
39 ///////////////////////////////////////////////////////////////////////////////
40 
41 ///////////////////////////////////////////////////////////////////////////////
42 // Interface - public :
43 
44 template <typename T>
45 inline
46 typename DGtal::FPLengthEstimator<T>::Quantity
47 DGtal::FPLengthEstimator<T>::eval(const ConstIterator& itb,
48  const ConstIterator& ite, const double h) const
49 {
50  ASSERT(h > 0.);
51 
52  Quantity val = 0.;
53  if ( isEmpty(itb,ite) )
54  return val;
55 
56  FaithfulPolygon fp( itb, ite );
57  std::vector<Point> points(fp.size());
58  fp.copyFP( points.begin() );
59 
60  typename std::vector<Point>::const_iterator i = points.begin();
61  typename std::vector<Point>::const_iterator j = i;
62  ++j;
63  const typename std::vector<Point>::const_iterator end = points.end();
64 
65  for ( ; j != end; ++i, ++j )
66  {
67  Vector v( *j - *i );
68  val += v.norm(Vector::L_2);
69  }
70  if ( IsCirculator<ConstIterator>::value )
71  {
72  Vector v( points.front() - *i );
73  val += v.norm(Vector::L_2);
74  }
75 
76  return val*h;
77 }
78 
79 
80 
81 
82 
83 
84 // ------------------------------------------------------------------------
85 template <typename T>
86 inline
87 void
88 DGtal::FPLengthEstimator<T>::selfDisplay ( std::ostream & out ) const
89 {
90  out << "[FPLengthEstimator]";
91  if (isValid())
92  out <<" initialized";
93  else
94  out<< " not initialized";
95 }
96 
97 // ------------------------------------------------------------------------
98 template <typename T>
99 inline
100 bool
101 DGtal::FPLengthEstimator<T>::isValid() const
102 {
103  return true;
104 }
105 
106 
107 
108 ///////////////////////////////////////////////////////////////////////////////
109 // Implementation of inline functions //
110 
111 template <typename T>
112 inline
113 std::ostream&
114 DGtal::operator<< ( std::ostream & out,
115  const FPLengthEstimator<T> & object )
116 {
117  object.selfDisplay( out );
118  return out;
119 }
120 
121 // //
122 ///////////////////////////////////////////////////////////////////////////////
123 
124