DBScan3DAlg.h

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// 
// The MIT License (MIT)
// 
// Copyright (c) 2015 Gagarine Yaikhom
// 
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
// 
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
//
// https://github.com/gyaikhom/dbscan
//
// Modified by tjyang@fnal.gov
//
#ifndef DBSCAN3DALG_H
#define DBSCAN3DALG_H

#define UNCLASSIFIED -1
#define NOISE -2

#define CORE_POINT 1
#define NOT_CORE_POINT 0

#define SUCCESS 0
#define FAILURE -3

#include "fhiclcpp/ParameterSet.h"
#include "canvas/Persistency/Common/Ptr.h"
#include "canvas/Persistency/Common/FindManyP.h"
#include "larcore/Geometry/Geometry.h"
#include <map>

namespace recob { 
  class SpacePoint; 
  class Hit;
}

typedef struct point_s point_t;
struct point_s {
  art::Ptr<recob::SpacePoint> sp;
  unsigned int nbadchannels;
  int cluster_id;
};

typedef struct node_s node_t;
struct node_s {
  unsigned int index;
  node_t *next;
};

typedef struct epsilon_neighbours_s epsilon_neighbours_t;
struct epsilon_neighbours_s {
  unsigned int num_members;
  node_t *head, *tail;
};

namespace cluster{

//--------------------------------------------------------------- 
class DBScan3DAlg {
  public:
    
    
    DBScan3DAlg(fhicl::ParameterSet const& pset);
    virtual ~DBScan3DAlg();

    std::vector<point_t> points;

    void init(const std::vector<art::Ptr<recob::SpacePoint>>& sps,
              art::FindManyP<recob::Hit>& hitFromSp);
    void dbscan();    
    
  private:

    double epsilon;
    unsigned int minpts;
    double badchannelweight;
    unsigned int neighbors;
    std::map<geo::WireID, int> badchannelmap;

    node_t *create_node(unsigned int index);
    int append_at_end(unsigned int index,
                      epsilon_neighbours_t *en);
    epsilon_neighbours_t *get_epsilon_neighbours(unsigned int index);
    void destroy_epsilon_neighbours(epsilon_neighbours_t *en);
    int expand(unsigned int index,
               unsigned int cluster_id);
    int spread(unsigned int index,
               epsilon_neighbours_t *seeds,
               unsigned int cluster_id);
    float dist(point_t *a, point_t *b);


  }; // class DBScan3DAlg
} // namespace

#endif // ifndef DBSCAN3DALG_H