class GrandCylindre{
  int nbAnneaux=10;
  int nbImages=30;//nb d'images par anneaux
  float rayCyl;//rayon du cylindre
  float hauCyl;//hauteur du cylindre
  float hAnneau;
  float bouge;
  float centreImpactangle;// decalage de l'anneau
  Anneau[] anneaux=new Anneau[nbAnneaux];
  Vecteur XX,YY,ZZ;
  Vecteur vectEyeMouse , vectEyeImpact,vectOImpact,vectCentreImpact;
  Quat quatCyl, quatCylConj ;
  //------------------------------------
  //---
  //------------------------------------
  public GrandCylindre(){
    quatCyl=new Quat(new Vecteur(0.2,0.12,1),0.3,1);
    XX=X0.cloner();
    YY=Y0.cloner();
    ZZ=Z0.cloner();
    rayCyl=200;
    hauCyl=400;
     vectEyeMouse=new Vecteur(0,0,dEcranEye);
    hAnneau=hauCyl/nbAnneaux;
    for(int i=0;i<nbAnneaux;i++){
      anneaux[i]=new Anneau(i,nbAnneaux,rayCyl,hauCyl,nbImages);


    }
  }
  //------------------------------------
  //---
  //------------------------------------

  void dessiner(){
  tournerRepere();
    for(int i=0;i<nbAnneaux;i++)
    {

      anneaux[i].dessiner();

    }
  }
  //++++++++++++++++++++++++++++++++++++++++++++++++++
  //
  //++++++++++++++++++++++++++++++++++++++++++++++++++ 
  void tournerRepere(){
    ZZ=quatCyl.tourner(Z0);
    YY=quatCyl.tourner(Y0);
    XX=quatCyl.tourner(X0);
  }

  //++++++++++++++++++++++++++++++++++++++++++++++++++
  //
  //++++++++++++++++++++++++++++++++++++++++++++++++++ 

  //++++++++++++++++++++++++++++++++++++++++++++++++++
  //
  //++++++++++++++++++++++++++++++++++++++++++++++++++ 
  public void intersectionRayonCylindre(){
    float lambda;
    vectEyeMouse.x=eye.x-mouseX ;
    vectEyeMouse.y=eye.y-mouseY; 
     vectEyeMouse.z=eye.z;
    float a=vectEyeMouse.dot(vectEyeMouse)-sq(vectEyeMouse.dot(YY));
    float b=distance*(vectEyeMouse.dot(Z0)-(vectEyeMouse.dot(YY))*(Z0.dot(YY)));
    float c=-rayCyl*rayCyl  +  distance*distance*(1-sq(Z0.dot(YY)));

  
    float delta= b*b-a*c;

    if(delta>=0){
      lambda=(-b+sqrt(delta))/a;
      vectEyeImpact= vectEyeMouse.mul(lambda);
      vectOImpact=eye.ajouter(vectEyeMouse,lambda);
        
     
     vectCentreImpact=Vecteur.comb(lambda,vectEyeMouse,distance,Z0);
        letrajet.addVecteur( vectCentreImpact.cloner());
  } else{
  vectOImpact=new Vecteur(300,300,300);
  vectCentreImpact=new Vecteur(300,300,300);
  }
  }
    

  //++++++++++++++++++++++++++++++++++++++++++++++++++
  //
  //++++++++++++++++++++++++++++++++++++++++++++++++++ 
 void bouger(){
 bouge+=0.01;
 quatCyl=new Quat(new Vecteur(cos(bouge)+bouge/500,sin(bouge*1.5),sin(bouge*1.5)+cos(bouge)), bouge+cos(bouge),1);
 quatCyl.normalize(1);
 quatCylConj=quatCyl.conjugue();
 } 
  
  
}