text: /*=========================================================================
   *
   *  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 itkTanImageAdaptor_h
  #define itkTanImageAdaptor_h
  
  #include "itkImageAdaptor.h"
  #include "vnl/vnl_math.h"
  
  namespace itk
  {
  namespace Accessor
  {
  /** \class TanPixelAccessor
   * \brief Give access to the std::tan() function of a value
   *
   * TanPixelAccessor is templated over an internal type and an
   * external type representation. This class cast the input
   * applies the function to it and cast the result according
   * to the types defined as template parameters
   *
   * \ingroup ImageAdaptors
   * \ingroup ITKImageAdaptors
   */
  template< typename TInternalType, typename TExternalType >
  class TanPixelAccessor
  {
  public:
    /** External typedef. It defines the external aspect
     * that this class will exhibit. */
    typedef TExternalType ExternalType;
  
    /** Internal typedef. It defines the internal real
     * representation of data. */
    typedef TInternalType InternalType;
  
    static inline void Set(TInternalType & output, const TExternalType & input)
    { output = (TInternalType)std::tan( (double)input ); }
  
    static inline TExternalType Get(const TInternalType & input)
    { return (TExternalType)std::tan( (double)input ); }
  };
  } // end namespace Accessor
  
  /** \class TanImageAdaptor
   * \brief Presents an image as being composed of the std::tan() of its pixels
   *
   * Additional casting is performed according to the input and output image
   * types following C++ default casting rules.
   *
   * \ingroup ImageAdaptors
   *
   * \ingroup ITKImageAdaptors
   */
  template< typename TImage, typename TOutputPixelType >
  class TanImageAdaptor:public
    ImageAdaptor< TImage,
                  Accessor::TanPixelAccessor<
                    typename TImage::PixelType,
                    TOutputPixelType >   >
  {
  public:
    /** Standard class typedefs. */
    typedef TanImageAdaptor Self;
    typedef ImageAdaptor< TImage, Accessor::TanPixelAccessor<
                            typename TImage::PixelType,
                            TOutputPixelType > > Superclass;
  
    typedef SmartPointer< Self >       Pointer;
    typedef SmartPointer< const Self > ConstPointer;
  
    /** Method for creation through the object factory. */
    itkNewMacro(Self);
  
    /** Run-time type information (and related methods). */
    itkTypeMacro(TanImageAdaptor, ImageAdaptor);
  
  protected:
    TanImageAdaptor() {}
    virtual ~TanImageAdaptor() {}
  
  private:
    TanImageAdaptor(const Self &) ITK_DELETE_FUNCTION;
    void operator=(const Self &) ITK_DELETE_FUNCTION;
  };
  } // end namespace itk
  
  #endif
  