Пример #1
0
  void the_derive(double time, double y[], double dy[]) {
    int i;
    BallVector balls = decode_balls(y); // new BallVector();//Ball[num_balls];
    BallVector dballs = new BallVector(); // new Ball[num_balls];

    for (i = 0; i < num_balls; i++) {
      Ball p = balls.get2(i);
      Ball d = new Ball();
      d.pos = p.speed;
      d.speed = wall_power(p);
      d.speed.y -= 1; // gravity
      dballs.add(d);
    }

    for (i = 0; i < num_balls; i++)
      for (int j = i + 1; j < num_balls; j++) {
        Ball p1 = balls.get2(i);
        Ball p2 = balls.get2(j);
        if (far_away_fast_calc(p1.pos, p2.pos, radius * 2)) continue;
        double dist = p1.pos.calc_dist(p2.pos);
        // if (dist>radius*2)
        //	continue;

        Vec collide_power = calc_collide_power(p1, p2, dist);
        dballs.get2(i).speed.add_to(collide_power);
        dballs.get2(j).speed.sub_to(collide_power);
      }
    for (i = 0; i < springs.size(); i++) {
      Spring s = springs.get2(i);
      Vec collide_power = calc_spring_power(balls.get2(s.start), balls.get2(s.end));
      dballs.get2(s.start).speed.add_to(collide_power);
      dballs.get2(s.end).speed.sub_to(collide_power);
    }
    encode_balls(dballs, dy);
  };
Пример #2
0
 void new_ball(Vec vec) {
   Ball b = new Ball();
   b.pos = vec;
   balls.add(b);
 }