ManhattenDistance.hpp

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// Copyright (c) 2017 Czech Technical University in Prague | Faculty of Information Technology. All rights reserved.
 
#pragma once
 
#include <cmath>
#include <alib/pair>
#include <functional>
 
namespace graph {
 
namespace heuristic {
 
class ManhattenDistance {
// ---------------------------------------------------------------------------------------------------------------------
 
 public:
 
  template<typename TCoordinate>
  static TCoordinate manhattenDistance(const ext::pair<TCoordinate, TCoordinate> &goal,
                                       const ext::pair<TCoordinate, TCoordinate> &node);
 
// ---------------------------------------------------------------------------------------------------------------------
 
  template<typename TCoordinate>
  static
  std::function<TCoordinate(const ext::pair<TCoordinate, TCoordinate> &,
                            const ext::pair<TCoordinate, TCoordinate> &)> manhattenDistanceFunction();
 
// ---------------------------------------------------------------------------------------------------------------------
 
};
 
// =====================================================================================================================
 
template<typename TCoordinate>
TCoordinate ManhattenDistance::manhattenDistance(const ext::pair<TCoordinate, TCoordinate> &goal,
                                                 const ext::pair<TCoordinate, TCoordinate> &node) {
  return std::abs(node.first - goal.first) + std::abs(node.second - goal.second);
}
 
// ---------------------------------------------------------------------------------------------------------------------
 
template<typename TCoordinate>
std::function<TCoordinate(const ext::pair<TCoordinate, TCoordinate> &,
                          const ext::pair<TCoordinate, TCoordinate> &)> ManhattenDistance::manhattenDistanceFunction() {
  return manhattenDistance < TCoordinate >;
}
 
// ---------------------------------------------------------------------------------------------------------------------
 
} // namespace heuristic
 
} // namespace graph