int nbilles=7;
Systeme sys;
void setup(){
  size(600,400);

  sys=new Systeme(nbilles);
  sys.init();
}

void loop(){
  sys.afficher();
}

class Systeme {
  Bille[] table;
  int nb;float angle,chocx,chocy;
  public Systeme(int nb) {
    this.nb = nb;
    this.angle=0;
    this.chocx=0;
    this.chocy=0;
    this.table =new Bille[nb];

    init();
  }
  void init() {
    for (int i = 0; i<nb; i++) {
      println(nb);
      table[i]=new Bille(nb,this,i);

    }
  }
  void afficher(){
    delay(20);
    background(25,60,90);
    translate(width /2, height /3,-300);
    rotateX(0.98);
   
    
    rotateZ(-table[0].alfa+PI);translate(-table[0]._x,-table[0]._y,-50);
    rectMode(CENTER_DIAMETER);
    stroke(255,0,0);
    line(0,0,0,200,0,0);
    stroke(0,255,0);
    line(0,0,0,0,200,0);
    stroke(0,0,255);
    line(0,0,0,0,0,200);noLights();
    noStroke();
    fill(40,100,50);
    rect(0,0, 550,500);
    push();fill(150,200,190,150);translate(0,250);rotateX(HALF_PI);rect(0,20,550,40);pop();
    push();fill(150,100,120,150); translate(0,-250);rotateX(-HALF_PI);rect(0,-20,550,40);pop();   
     push();fill(100,200,190,150);translate(275,0);rotateY(HALF_PI);rect(-20,0,40,500);pop();
    push();fill(140,100,120,150); translate(-275,0);rotateY(-HALF_PI);rect(20,0,40,500);pop();
    
    
    for(int i=0; i<nb; i++){
      table[i].comportement();
    }
    for(int i=0; i<nb; i++){
      table[i].dessiner();
    }
  }
}

class Bille  {
  float  vx, vy, tempo, amorti, r, m,_x,_y,_xscale,_yscale,alfa,rouge,vert,bleu;
  int numero,nb;
  boolean presse;
  Systeme lesysteme;
  public Bille(int nb,Systeme ss,int numero) {
    this.nb=nb;
    this.lesysteme = ss;
    this.numero = numero;
    init();
  }
  void  init() {

    this._x = random(-200,200);
    this._y = random(-200,200);
    this.vx = random(-1000,1000);
    this.vy = random(-1000,1000);
    this._yscale = 30+random(70);
    this._xscale = this._yscale;
    this.alfa=0;
    this.r = _yscale/2;
    this.m = r*r*r;
    this.presse = false;
    this.tempo = 0.01;
    this.amorti = 1;  
    this.rouge=55;this.vert=101;this.bleu=254;
  }
  void comportement() {

    limite();
    choc();
    vx *= amorti;
    vy *= amorti;
    _x += tempo*vx;
    _y += tempo*vy;

  }
//};
void  limite() {
  if (_x>275-r) {jaune(vx,vy);
    _x = 275-r;
    vx *= -1;
  }
  if (_x<-275+r) {jaune(vx,vy);
    _x = -275+r;
    vx *= -1;
  }
  if (_y>250-r) {jaune(vx,vy);
    _y = 250-r;
    vy *= -1;
  }
  if (_y<-250+r) {jaune(vx,vy);
    _y = -250+r;
    vy *= -1;
  }
}
void jaune(float a,float b){
rouge=255;vert=255;bleu=0;
lesysteme.chocx+=a/50;lesysteme.chocy+=b;
}

void  choc() {
  for (int i = 0; i<nb; i++) {
    int j = numero;
    if (i<j) {
      float a = _x-lesysteme.table[i]._x;
      float b = _y-lesysteme.table[i]._y;
      float cc = sqrt(a*a+b*b);
      float c = lesysteme.table[i].r+r;
      float dis = a*a+b*b-c*c;
      if (dis<0) {
      rouge=lesysteme.table[i].rouge=255;
      vert=lesysteme.table[i].vert=0;
      bleu=lesysteme.table[i].bleu=0;
        float nx = a/cc;
        float ny = b/cc;
        float tx = -ny;
        float ty = nx;
        float rm = lesysteme.table[i].m/m;
        float e = amorti;
        float xx = (1-rm*e)/(1+rm)*(vx*nx+vy*ny)+rm*(1+e)/(1+rm)*(lesysteme.table[i].vx*nx+lesysteme.table[i].vy*ny);
        float yy = vx*tx+vy*ty;
        float xx1 = (1+e)/(1+rm)*(vx*nx+vy*ny)+(rm-e)/(1+rm)*(lesysteme.table[i].vx*nx+lesysteme.table[i].vy*ny);
        float yy1 = lesysteme.table[i].vx*tx+lesysteme.table[i].vy*ty;
        vx = xx*nx+yy*tx;
        vy = xx*ny+yy*ty;
        lesysteme.table[i].vx = xx1*nx+yy1*tx;
        lesysteme.table[i].vy = xx1*ny+yy1*ty;
        _x = lesysteme.table[i]._x+(c+1)*nx;
        _y = lesysteme.table[i]._y+(c+1)*ny;
      }
    }
  }
}
void dessiner(){
  push();
  translate(_x,_y,0);
  ellipseMode(CENTER_DIAMETER);
  stroke(255,255,0);noLights();
  fill(155,130,30);
  translate(0,0,2);
  ellipse(0,0,2*r,2*r);
  stroke(100,120,120);
  alfa+=(-atan2(vx,vy)-alfa)/4;
  rotateZ(alfa);
  translate(0,0,50);
  
 fill(rouge+=(155-rouge)/5,vert+=(151-vert)/5,bleu+=(254-bleu)/5);
  box(r/2,r*2,100);
  pop();
}
}