1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
|
/*=========================================================================
*
* Copyright Insight Software Consortium
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0.txt
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*=========================================================================*/
// Software Guide : BeginLatex
//
// We will describe how to use \doxygen{PointSet} as a
// \subdoxygen{Statistics}{Sample} using an adaptor in this example.
//
// \index{itk::Statistics::PointSetToListSampleAdaptor}
//
// The \subdoxygen{Statistics}{PointSetToListSampleAdaptor} class requires a
// PointSet as input. The PointSet class is an associative data
// container. Each point in a PointSet object can have an associated
// optional data value. For the statistics subsystem, the current
// implementation of PointSetToListSampleAdaptor takes only the point part
// into consideration. In other words, the measurement vectors from a
// PointSetToListSampleAdaptor object are points from the PointSet
// object that is plugged into the adaptor object.
//
// To use an PointSetToListSampleAdaptor class, we include the header file for the
// class.
//
// Software Guide : EndLatex
// Software Guide : BeginCodeSnippet
#include "itkPointSetToListSampleAdaptor.h"
// Software Guide : EndCodeSnippet
// Software Guide : BeginLatex
//
// Since we are using an adaptor, we also include the header file for
// the PointSet class.
//
// Software Guide :EndLatex
// Software Guide : BeginCodeSnippet
#include "itkPointSet.h"
#include "itkVector.h"
// Software Guide : EndCodeSnippet
int main()
{
// Software Guide : BeginLatex
//
// Next we create a PointSet object.
// The following code
// snippet will create a PointSet object that stores points (its coordinate
// value type is float) in 3D space.
//
// Software Guide :EndLatex
// Software Guide : BeginCodeSnippet
typedef itk::PointSet< short > PointSetType;
PointSetType::Pointer pointSet = PointSetType::New();
// Software Guide : EndCodeSnippet
// Software Guide : BeginLatex
//
// Note that the \code{short} type used in the declaration of
// \code{PointSetType} pertains to the pixel type associated with every
// point, not to the type used to represent point coordinates. If we want
// to change the type of the point in terms of the coordinate value and/or
// dimension, we have to modify the \code{TMeshTraits} (one of the optional
// template arguments for the \code{PointSet} class). The easiest way of
// creating a custom mesh traits instance is to specialize the existing
// \doxygen{DefaultStaticMeshTraits}. By specifying the \code{TCoordRep}
// template argument, we can change the coordinate value type of a point.
// By specifying the \code{VPointDimension} template argument, we can
// change the dimension of the point. As mentioned earlier, a
// \code{PointSetToListSampleAdaptor} object cares only about the points, and the
// type of measurement vectors is the type of points.
//
// Software Guide : EndLatex
// Software Guide : BeginLatex
//
// To make the example a little bit realistic, we add two points
// into the \code{pointSet}.
//
// Software Guide : EndLatex
// Software Guide : BeginCodeSnippet
PointSetType::PointType point;
point[0] = 1.0;
point[1] = 2.0;
point[2] = 3.0;
pointSet->SetPoint( 0UL, point);
point[0] = 2.0;
point[1] = 4.0;
point[2] = 6.0;
pointSet->SetPoint( 1UL, point );
// Software Guide : EndCodeSnippet
// Software Guide : BeginLatex
//
// Now we have a PointSet object with two points in it. The
// PointSet is ready to be plugged into the adaptor.
// First, we create an instance of the PointSetToListSampleAdaptor class
// with the type of the input PointSet object.
//
// Software Guide : EndLatex
// Software Guide : BeginCodeSnippet
typedef itk::Statistics::PointSetToListSampleAdaptor<
PointSetType > SampleType;
SampleType::Pointer sample = SampleType::New();
// Software Guide : EndCodeSnippet
// Software Guide : BeginLatex
//
// Second, all we have to do is
// plug in the PointSet object to the adaptor. After that,
// we can use the common methods and iterator interfaces shown in
// Section~\ref{sec:SampleInterface}.
//
// Software Guide : EndLatex
// Software Guide : BeginCodeSnippet
sample->SetPointSet( pointSet );
SampleType::Iterator iter = sample->Begin();
while( iter != sample->End() )
{
std::cout << "id = " << iter.GetInstanceIdentifier()
<< "\t measurement vector = "
<< iter.GetMeasurementVector()
<< "\t frequency = "
<< iter.GetFrequency()
<< std::endl;
++iter;
}
// Software Guide : EndCodeSnippet
return EXIT_SUCCESS;
}
|
