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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: itkColormapFunctor.h
Language: C++
Date: $Date$
Version: $Revision$
Copyright (c) Insight Software Consortium. All rights reserved.
See ITKCopyright.txt or http://www.itk.org/HTML/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 notices for more information.
=========================================================================*/
#ifndef __itkColormapFunctor_h
#define __itkColormapFunctor_h
#include "itkLightObject.h"
#include "itkNumericTraits.h"
#include "itkRGBPixel.h"
namespace itk {
namespace Functor {
/**
* \class ColormapFunctor
* \brief Function object which maps a scalar value into an RGB colormap value.
*
*
* \author Nicholas Tustison, Hui Zhang, Gaetan Lehmann, Paul Yushkevich and ̈James C. Gee
*
* This code was contributed in the Insight Journal paper:
*
* "Meeting Andy Warhol Somewhere Over the Rainbow: RGB Colormapping and ITK"
* http://www.insight-journal.org/browse/publication/285
* http://hdl.handle.net/1926/1452
*
*/
template< class TScalar, class TRGBPixel >
class ITK_EXPORT ColormapFunctor : public Object
{
public:
typedef ColormapFunctor Self;
typedef Object Superclass;
typedef SmartPointer<Self> Pointer;
typedef SmartPointer<const Self> ConstPointer;
/** Run-time type information (and related methods). */
itkTypeMacro(ColormapFunctor, Object);
typedef TRGBPixel RGBPixelType;
typedef typename TRGBPixel::ComponentType RGBComponentType;
typedef TScalar ScalarType;
typedef typename NumericTraits<ScalarType>::RealType RealType;
itkSetMacro( MinimumRGBComponentValue, RGBComponentType );
itkGetConstMacro( MinimumRGBComponentValue, RGBComponentType );
itkSetMacro( MaximumRGBComponentValue, RGBComponentType );
itkGetConstMacro( MaximumRGBComponentValue, RGBComponentType );
itkSetMacro( MinimumInputValue, ScalarType );
itkGetConstMacro( MinimumInputValue, ScalarType );
itkSetMacro( MaximumInputValue, ScalarType );
itkGetConstMacro( MaximumInputValue, ScalarType );
virtual bool operator!=( const ColormapFunctor & ) const
{
return false;
}
virtual bool operator==( const ColormapFunctor & other ) const
{
return !(*this != other);
}
virtual RGBPixelType operator()( const ScalarType & ) const = 0;
protected:
ColormapFunctor()
{
this->m_MinimumInputValue = NumericTraits<TScalar>::min();
this->m_MaximumInputValue = NumericTraits<TScalar>::max();
this->m_MinimumRGBComponentValue = NumericTraits<RGBComponentType>::min();
this->m_MaximumRGBComponentValue = NumericTraits<RGBComponentType>::max();
}
~ColormapFunctor() {};
/**
* Map [min, max] input values to [0, 1].
*/
RealType RescaleInputValue( ScalarType v ) const
{
RealType d = static_cast<RealType>( this->m_MaximumInputValue - this->m_MinimumInputValue );
RealType value = ( static_cast<RealType>( v )
- static_cast<RealType>( this->m_MinimumInputValue ) ) / d;
value = vnl_math_max( 0.0, value );
value = vnl_math_min( 1.0, value );
return value;
}
/**
* Map [0, 1] value to [min, max] rgb component values.
*/
RGBComponentType RescaleRGBComponentValue( RealType v ) const
{
RealType d = static_cast<RealType>( m_MaximumRGBComponentValue - m_MinimumRGBComponentValue );
const RGBComponentType rescaled =
static_cast<RGBComponentType>( d * v ) + this->m_MinimumRGBComponentValue;
return rescaled;
}
void PrintSelf(std::ostream& os, Indent indent) const
{
Superclass::PrintSelf(os, indent);
os << indent << "Minimum RGB Component Value: "
<< static_cast<typename NumericTraits<RGBComponentType>::PrintType>(
this->GetMinimumRGBComponentValue()) << std::endl;
os << indent << "Maximum RGB Component Value: "
<< static_cast<typename NumericTraits<RGBComponentType>::PrintType>(
this->GetMaximumRGBComponentValue()) << std::endl;
os << indent << "Minimum Input Value: "
<< static_cast<typename NumericTraits<ScalarType>::PrintType>(
this->GetMinimumInputValue()) << std::endl;
os << indent << "Maximum Input Value: "
<< static_cast<typename NumericTraits<ScalarType>::PrintType>(
this->GetMaximumInputValue()) << std::endl;
}
private:
ColormapFunctor(const Self&); //purposely not implemented
void operator=(const Self&); //purposely not implemented
ScalarType m_MinimumInputValue;
ScalarType m_MaximumInputValue;
RGBComponentType m_MinimumRGBComponentValue;
RGBComponentType m_MaximumRGBComponentValue;
};
} // end namespace functor
} // end namespace itk
#endif
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