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
|
/*=========================================================================
Program: Visualization Toolkit
Module: vtkGaussianKernel.cxx
Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
All rights reserved.
See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notice for more information.
=========================================================================*/
#include "vtkGaussianKernel.h"
#include "vtkAbstractPointLocator.h"
#include "vtkObjectFactory.h"
#include "vtkIdList.h"
#include "vtkDoubleArray.h"
#include "vtkDataSet.h"
#include "vtkPointData.h"
#include "vtkMath.h"
#include "vtkMathUtilities.h"
vtkStandardNewMacro(vtkGaussianKernel);
//----------------------------------------------------------------------------
vtkGaussianKernel::vtkGaussianKernel()
{
this->Sharpness = 2.0;
this->F2 = this->Sharpness / this->Radius;
}
//----------------------------------------------------------------------------
vtkGaussianKernel::~vtkGaussianKernel()
{
}
//----------------------------------------------------------------------------
void vtkGaussianKernel::
Initialize(vtkAbstractPointLocator *loc, vtkDataSet *ds, vtkPointData *pd)
{
this->Superclass::Initialize(loc, ds, pd);
this->F2 = this->Sharpness / this->Radius;
this->F2 = this->F2 * this->F2;
}
//----------------------------------------------------------------------------
vtkIdType vtkGaussianKernel::
ComputeWeights(double x[3], vtkIdList *pIds, vtkDoubleArray *prob,
vtkDoubleArray *weights)
{
vtkIdType numPts = pIds->GetNumberOfIds();
int i;
vtkIdType id;
double d2, y[3], sum = 0.0;
weights->SetNumberOfTuples(numPts);
double *p = (prob ? prob->GetPointer(0) : NULL);
double *w = weights->GetPointer(0);
double f2=this->F2;
for (i=0; i<numPts; ++i)
{
id = pIds->GetId(i);
this->DataSet->GetPoint(id,y);
d2 = vtkMath::Distance2BetweenPoints(x,y);
if ( vtkMathUtilities::FuzzyCompare(d2, 0.0, std::numeric_limits<double>::epsilon()*256.0 )) //precise hit on existing point
{
pIds->SetNumberOfIds(1);
pIds->SetId(0,id);
weights->SetNumberOfTuples(1);
weights->SetValue(0,1.0);
return 1;
}
else
{
w[i] = (p ? p[i]*exp(-f2 * d2) : exp(-f2 * d2));
sum += w[i];
}
}//over all points
// Normalize
if ( this->NormalizeWeights && sum != 0.0 )
{
for (i=0; i<numPts; ++i)
{
w[i] /= sum;
}
}
return numPts;
}
//----------------------------------------------------------------------------
void vtkGaussianKernel::PrintSelf(ostream& os, vtkIndent indent)
{
this->Superclass::PrintSelf(os,indent);
os << indent << "Sharpness: " << this->GetSharpness() << endl;
}
|
