//
// Computergraphik II
// Prof. Dr. Juergen Doellner
// Wintersemester 2001/02
// 
// Rahmenprogramm zu Aufgabenzettel 1
//

#ifndef _TRIANGLE_H
#define _TRIANGLE_H

#include "vector.h"

//- Triangle
class Triangle {
//. 3D Triangle Class.
public:
    //- Triangle
    Triangle();
    Triangle(const Vector& v0, const Vector& v1, const Vector& v2);    
        
    //- set/getVertex, set/GetNormal, triangleNormal
    const Vector& getVertex(int i) const;
    void setVertex(int i,const Vector& v);
    const Vector& getNormal(int i) const;
    void setNormal(int i,const Vector& n);        
    const Vector& triangleNormal() const;    


    void normalizeNormals();

    //- operator>>
    friend  istream& operator>>(istream&, Triangle&);

private:
    Vector v_[3];
    Vector n_[3];  
    Vector triNrm_;
};


inline const Vector& Triangle::getVertex(int i) const { return v_[i]; }
inline void Triangle::setVertex(int i,const Vector& v) { v_[i] = v; }
inline const Vector& Triangle::getNormal(int i) const { return n_[i]; }
inline void Triangle::setNormal(int i,const Vector& n) { n_[i] = n; }
inline const Vector& Triangle::triangleNormal() const { return triNrm_;}


#endif // _TRIANGLE_H