/*=========================================================================
 *
 *  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 __itkContinuousIndex_h
#define __itkContinuousIndex_h

#include "itkPoint.h"
#include "itkIndex.h"

namespace itk
{
/** \class ContinuousIndex
 * \brief A templated class holding a point in n-Dimensional image space.
 *
 * ContinuousIndex is a templated class that holds a set of coordinates
 * (components).
 * The template parameter TCoordRep can be any data type that behaves
 * like a primitive (or atomic) data type (int, short, float, complex).
 * The VIndexDimension defines the number of  components in the continuous
 * index array.
 *
 * \sa Point
 * \sa Index
 *
 * \ingroup ImageAccess
 * \ingroup ImageObjects
 *
 * \ingroup ITKCommon
 */
template< typename TCoordRep = double, unsigned int VIndexDimension = 2 >
class ContinuousIndex:public Point< TCoordRep, VIndexDimension >
{
public:
  /** Standard class typedefs. */
  typedef ContinuousIndex                     Self;
  typedef Point< TCoordRep, VIndexDimension > Superclass;

  /** ValueType can be used to declare a variable that is the same type
   * as a data element held in an Point.   */
  typedef TCoordRep ValueType;
  typedef TCoordRep CoordRepType;

  /** Dimension of the Space */
  itkStaticConstMacro(IndexDimension, unsigned int, VIndexDimension);

  /** Corresponding discrete index type */
  typedef Index< VIndexDimension > IndexType;

  /** The Array type from which this Vector is derived. */
  typedef typename Superclass::BaseArray    BaseArray;
  typedef typename BaseArray::Iterator      Iterator;
  typedef typename BaseArray::ConstIterator ConstIterator;

  /** Default constructor has nothing to do. */
  ContinuousIndex() {}

  /** Pass-through constructor to the Point base class. */
  ContinuousIndex(const Self & r):Superclass(r) {}
  ContinuousIndex(const ValueType r[IndexDimension]):Superclass(r) {}

  /** Construct from discrete index type */
  ContinuousIndex(const IndexType & index)
  {
    for ( unsigned int i = 0; i < VIndexDimension; i++ )
      {
      ( *this )[i] = TCoordRep(index[i]);
      }
  }
};
} // namespace itk

#endif
