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
|
/*=========================================================================
*
* 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.
*
*=========================================================================*/
#ifndef itkLevelSetTestFunction_hxx
#define itkLevelSetTestFunction_hxx
#include "itkLevelSetTestFunction.h"
namespace itk
{
template< typename TPixel >
typename LevelSetTestFunction< TPixel >::OutputRealType
LevelSetTestFunction< TPixel >
::Evaluate( const PointType & point ) const
{
return static_cast< OutputRealType >( std::sqrt((point[0] - 7.0)*(point[0] - 7.0) + (point[1] - 4.0)*(point[1] - 4.0)) - 3.0 );
}
template< typename TPixel >
typename LevelSetTestFunction< TPixel >::GradientType
LevelSetTestFunction< TPixel >
::EvaluateGradient( const PointType & point ) const
{
GradientType gradient;
gradient[0] = (point[0] - 7.0) /
std::sqrt( (point[0] - 7.0)*(point[0] - 7.0) + (point[1] - 4.0)*(point[1] - 4.0) );
gradient[1] = (point[1] - 4.0) /
std::sqrt( (point[0] - 7.0)*(point[0] - 7.0) + (point[1] - 4.0)*(point[1] - 4.0) );
return gradient;
}
} // end namespace itk
#endif
|
