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/*=========================================================================
*
* Copyright NumFOCUS
*
* 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
*
* https://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 itkGaussianSpatialObject_hxx
#define itkGaussianSpatialObject_hxx
#include <cmath>
namespace itk
{
template <unsigned int TDimension>
GaussianSpatialObject<TDimension>::GaussianSpatialObject()
{
this->SetTypeName("GaussianSpatialObject");
this->Clear();
this->Update();
}
template <unsigned int TDimension>
void
GaussianSpatialObject<TDimension>::Clear()
{
Superclass::Clear();
m_CenterInObjectSpace.Fill(0.0);
m_RadiusInObjectSpace = 1.0;
m_SigmaInObjectSpace = 1.0;
m_Maximum = 1.0;
this->Modified();
}
template <unsigned int TDimension>
auto
GaussianSpatialObject<TDimension>::SquaredZScoreInObjectSpace(const PointType & point) const -> ScalarType
{
ScalarType r = 0;
for (unsigned int i = 0; i < TDimension; ++i)
{
r += point[i] * point[i];
}
return r / (m_SigmaInObjectSpace * m_SigmaInObjectSpace);
}
template <unsigned int TDimension>
auto
GaussianSpatialObject<TDimension>::SquaredZScoreInWorldSpace(const PointType & point) const -> ScalarType
{
PointType transformedPoint = this->GetObjectToWorldTransformInverse()->TransformPoint(point);
return this->SquaredZScoreInObjectSpace(transformedPoint);
}
template <unsigned int TDimension>
bool
GaussianSpatialObject<TDimension>::IsInsideInObjectSpace(const PointType & point) const
{
if (m_RadiusInObjectSpace > itk::Math::eps)
{
if (this->GetMyBoundingBoxInObjectSpace()->IsInside(point))
{
double r = 0;
for (unsigned int i = 0; i < TDimension; ++i)
{
r += (point[i] - m_CenterInObjectSpace[i]) * (point[i] - m_CenterInObjectSpace[i]);
}
r /= (m_RadiusInObjectSpace * m_RadiusInObjectSpace);
if (r <= 1.0)
{
return true;
}
}
}
return false;
}
template <unsigned int TDimension>
void
GaussianSpatialObject<TDimension>::ComputeMyBoundingBox()
{
itkDebugMacro("Computing Gaussian bounding box");
PointType pnt1;
PointType pnt2;
for (unsigned int i = 0; i < TDimension; ++i)
{
pnt1[i] = m_CenterInObjectSpace[i] - m_RadiusInObjectSpace;
pnt2[i] = m_CenterInObjectSpace[i] + m_RadiusInObjectSpace;
}
this->GetModifiableMyBoundingBoxInObjectSpace()->SetMinimum(pnt1);
this->GetModifiableMyBoundingBoxInObjectSpace()->SetMaximum(pnt1);
this->GetModifiableMyBoundingBoxInObjectSpace()->ConsiderPoint(pnt2);
this->GetModifiableMyBoundingBoxInObjectSpace()->ComputeBoundingBox();
}
template <unsigned int TDimension>
bool
GaussianSpatialObject<TDimension>::ValueAtInObjectSpace(const PointType & point,
double & value,
unsigned int depth,
const std::string & name) const
{
itkDebugMacro("Getting the value of the ellipse at " << point);
if (this->GetTypeName().find(name) != std::string::npos)
{
if (IsInsideInObjectSpace(point))
{
const double zsq = this->SquaredZScoreInObjectSpace(point);
value = m_Maximum * (ScalarType)std::exp(-zsq / 2.0);
return true;
}
}
if (depth > 0)
{
if (Superclass::ValueAtChildrenInObjectSpace(point, value, depth - 1, name))
{
return true;
}
}
value = this->GetDefaultOutsideValue();
return false;
}
template <unsigned int TDimension>
typename EllipseSpatialObject<TDimension>::Pointer
GaussianSpatialObject<TDimension>::GetEllipsoid() const
{
using EllipseType = itk::EllipseSpatialObject<TDimension>;
auto ellipse = EllipseType::New();
ellipse->SetRadiusInObjectSpace(m_RadiusInObjectSpace);
ellipse->SetCenterInObjectSpace(m_CenterInObjectSpace);
ellipse->GetModifiableObjectToWorldTransform()->SetFixedParameters(
this->GetObjectToWorldTransform()->GetFixedParameters());
ellipse->GetModifiableObjectToWorldTransform()->SetParameters(this->GetObjectToWorldTransform()->GetParameters());
ellipse->Update();
return ellipse;
}
template <unsigned int TDimension>
typename LightObject::Pointer
GaussianSpatialObject<TDimension>::InternalClone() const
{
// Default implementation just copies the parameters from
// this to new transform.
typename LightObject::Pointer loPtr = Superclass::InternalClone();
typename Self::Pointer rval = dynamic_cast<Self *>(loPtr.GetPointer());
if (rval.IsNull())
{
itkExceptionMacro("downcast to type " << this->GetNameOfClass() << " failed.");
}
rval->SetMaximum(this->GetMaximum());
rval->SetRadiusInObjectSpace(this->GetRadiusInObjectSpace());
rval->SetSigmaInObjectSpace(this->GetSigmaInObjectSpace());
rval->SetCenterInObjectSpace(this->GetCenterInObjectSpace());
return loPtr;
}
template <unsigned int TDimension>
void
GaussianSpatialObject<TDimension>::PrintSelf(std::ostream & os, Indent indent) const
{
Superclass::PrintSelf(os, indent);
os << indent << "Maximum: " << m_Maximum << std::endl;
os << indent << "Radius: " << m_RadiusInObjectSpace << std::endl;
os << indent << "Sigma: " << m_SigmaInObjectSpace << std::endl;
os << indent << "Center: " << m_CenterInObjectSpace << std::endl;
}
} // end namespace itk
#endif
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