itkSampleToHistogramFilter.h

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 *
 *  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 __itkSampleToHistogramFilter_h
#define __itkSampleToHistogramFilter_h

#include "itkMacro.h"
#include "itkProcessObject.h"
#include "itkMeasurementVectorTraits.h"
#include "itkSimpleDataObjectDecorator.h"

itkDeclareExceptionMacro( SampleToHistogramFilterException, ExceptionObject, "Histogram-related Exception");
itkDeclareExceptionMacro( MissingHistogramSizeInput, SampleToHistogramFilterException, "Histogram Size input is missing");
itkDeclareExceptionMacro( MissingHistogramMarginalScaleInput, SampleToHistogramFilterException, "Histogram marginal scale input is missing");
itkDeclareExceptionMacro( NullSizeHistogramInputMeasurementVectorSize, SampleToHistogramFilterException, "Input sample MeasurementVectorSize is zero");
itkDeclareExceptionMacro( MissingHistogramBinMaximumInput, SampleToHistogramFilterException, "Histogram Bin Maximum input is missing");
itkDeclareExceptionMacro( MissingHistogramBinMinimumInput, SampleToHistogramFilterException, "Histogram Bin Minimum input is missing");
itkDeclareExceptionMacro( HistogramWrongNumberOfComponents, SampleToHistogramFilterException, "Histogram has wrong number of components");

namespace itk
{
namespace Statistics
{

template< class TSample, class THistogram >
class ITK_EXPORT SampleToHistogramFilter:public ProcessObject
{
public:
  typedef SampleToHistogramFilter    Self;
  typedef ProcessObject              Superclass;
  typedef SmartPointer< Self >       Pointer;
  typedef SmartPointer< const Self > ConstPointer;

  itkTypeMacro(SampleToHistogramFilter, ProcessObject);

  itkNewMacro(Self);

  typedef TSample                                       SampleType;
  typedef THistogram                                    HistogramType;
  typedef typename SampleType::MeasurementVectorType    MeasurementVectorType;
  typedef typename MeasurementVectorType::ValueType     MeasurementType;
  typedef typename HistogramType::SizeType              HistogramSizeType;
  typedef typename HistogramType::MeasurementType       HistogramMeasurementType;
  typedef typename HistogramType::MeasurementVectorType HistogramMeasurementVectorType;

  typedef typename Superclass::DataObjectPointer DataObjectPointer;

  using Superclass::SetInput;

  virtual void SetInput(const SampleType *sample);

  virtual const SampleType * GetInput() const;

  const HistogramType  * GetOutput() const;

  typedef SimpleDataObjectDecorator<
    HistogramSizeType > InputHistogramSizeObjectType;

  typedef SimpleDataObjectDecorator<
    HistogramMeasurementType > InputHistogramMeasurementObjectType;

  typedef SimpleDataObjectDecorator<
    HistogramMeasurementVectorType > InputHistogramMeasurementVectorObjectType;

  typedef SimpleDataObjectDecorator< bool > InputBooleanObjectType;

  itkSetGetDecoratedInputMacro(HistogramSize, HistogramSizeType);

  itkSetGetDecoratedInputMacro(MarginalScale, HistogramMeasurementType);

  itkSetGetDecoratedInputMacro(HistogramBinMinimum, HistogramMeasurementVectorType);
  itkSetGetDecoratedInputMacro(HistogramBinMaximum, HistogramMeasurementVectorType);

  itkSetGetDecoratedInputMacro(AutoMinimumMaximum, bool);

  virtual void GraftOutput(DataObject *output);

protected:
  SampleToHistogramFilter();
  virtual ~SampleToHistogramFilter();

  void PrintSelf(std::ostream & os, Indent indent) const;

  typedef ProcessObject::DataObjectPointerArraySizeType DataObjectPointerArraySizeType;
  using Superclass::MakeOutput;
  virtual DataObjectPointer MakeOutput(DataObjectPointerArraySizeType idx);

  // Where the histogram is actually computed
  virtual void GenerateData();

private:
  SampleToHistogramFilter(const Self &); //purposely not implemented
  void operator=(const Self &);          //purposely not implemented

  HistogramMeasurementType SafeAssign(MeasurementType from) const
  {
    if(NumericTraits<HistogramMeasurementType>::is_integer)
      {
      MeasurementType fromMax = static_cast<MeasurementType>
        (NumericTraits<HistogramMeasurementType>::max());
      MeasurementType fromMin = static_cast<MeasurementType>
        (NumericTraits<HistogramMeasurementType>::min());

      if (from >= fromMax)
        {
        return NumericTraits<HistogramMeasurementType>::max();
        }
      else if (from <= fromMin)
        {
        return NumericTraits<HistogramMeasurementType>::min();
        }
      }
    return static_cast<HistogramMeasurementType>(from);
  }

};                                       // end of class
} // end of namespace Statistics
} // end of namespace itk

#ifndef ITK_MANUAL_INSTANTIATION
#include "itkSampleToHistogramFilter.hxx"
#endif

#endif