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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: itkCustomColormapFunctor.txx
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 __itkCustomColormapFunctor_txx
#define __itkCustomColormapFunctor_txx
#include "itkCustomColormapFunctor.h"
namespace itk {
namespace Functor {
template <class TScalar, class TRGBPixel>
typename CustomColormapFunctor<TScalar, TRGBPixel>::RGBPixelType
CustomColormapFunctor<TScalar, TRGBPixel>
::operator()( const TScalar & v ) const
{
// Map the input scalar between [0, 1].
RealType value = this->RescaleInputValue( v );
// Apply the color mapping.
RealType red = 0.0;
if ( this->m_RedChannel.size() == 1 || value == 0.0 )
{
red = this->m_RedChannel[0];
}
else if ( this->m_RedChannel.size() > 1 )
{
RealType size = static_cast<RealType>( this->m_RedChannel.size() );
unsigned int index = Math::Ceil<unsigned int>( value * ( size - 1.0 ) );
RealType p1 = this->m_RedChannel[index];
RealType m1 = this->m_RedChannel[index-1u];
RealType d = p1 - m1;
red = d * ( size - 1.0 ) * ( value - ( index - 1.0 )/( size - 1.0 ) )
+ m1;
}
RealType green = 0.0;
if ( this->m_GreenChannel.size() == 1 || value == 0.0 )
{
green = this->m_GreenChannel[0];
}
else if ( this->m_GreenChannel.size() > 1 )
{
RealType size = static_cast<RealType>( this->m_GreenChannel.size() );
unsigned int index = Math::Ceil<unsigned int>( value * ( size - 1.0 ) );
RealType p1 = this->m_GreenChannel[index];
RealType m1 = this->m_GreenChannel[index-1u];
RealType d = p1 - m1;
green = d * ( size - 1.0 ) * ( value - ( index - 1.0 )/( size - 1.0 ) )
+ m1;
}
RealType blue = 0.0;
if ( this->m_BlueChannel.size() == 1 || value == 0.0 )
{
blue = this->m_BlueChannel[0];
}
else if ( this->m_BlueChannel.size() > 1 )
{
RealType size = static_cast<RealType>( this->m_BlueChannel.size() );
unsigned int index = Math::Ceil<unsigned int>( value * ( size - 1.0 ) );
RealType p1 = this->m_BlueChannel[index];
RealType m1 = this->m_BlueChannel[index-1u];
RealType d = p1 - m1;
blue = d * ( size - 1.0 ) * ( value - ( index - 1.0 )/( size - 1.0 ) )
+ m1;
}
// Set the rgb components after rescaling the values.
RGBPixelType pixel;
pixel[0] = this->RescaleRGBComponentValue( red );
pixel[1] = this->RescaleRGBComponentValue( green );
pixel[2] = this->RescaleRGBComponentValue( blue );
return pixel;
}
} // end namespace Functor
} // end namespace itk
#endif
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