shells/subdiv/Edge.h

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// -*- C++ -*-
//
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//
//                                   Fehmi Cirak   
//                       California Institute of Technology
//                          (C) 2003 All Rights Reserved
//
// <LicenseText>
//
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//
#ifndef __Edge_h__
#define __Edge_h__

#include <functional>

#include "definitions.h"



namespace subdiv {

    template <typename T, typename V>
    class Edge {
    public:
        Edge(V* a, V* b):_m_a(a), _m_b(b){
            _m_t = NULL;
        }
        ~Edge(){}

        //interface
        V* first(){return _m_a;}
        V* second(){return _m_b;}
        T*& triangle(){return _m_t;}
        
        // Comparisson functor for edge sets
        struct edge_comp : public std::binary_function< Edge* ,  Edge* , bool> {
            edge_comp() {}
            bool operator()( Edge *e1,  Edge *e2 ) {
                const V* m1 = std::min( e1->first(), e1->second() );
                const V* m2 = std::min( e2->first(), e2->second() );
                return ( m1 < m2 ) ||
                    ( ( m1 == m2 ) && 
                      (std::max(e1->first(),e1->second()) < std::max(e2->first(),e2->second())) );
            }
        };
        
    private:
        V      *_m_a;         // first vertex
        V      *_m_b;         // second vertex
        T      *_m_t;         // one of the neighbouring triangles
    };
 
}

#endif /* __Edge_h__ */

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