CParticle

    class CParticle
    {
        function CParticle (x_, y_, mass_) {
            var _local1 = this;
            _local1.pos = new CVector2D(x_, y_);
            _local1.prevPos = _local1.pos.duplicate();
            _local1.mass = mass_;
            _local1.acc = new CVector2D(0, 0);
            _local1.mc = null;
        }
        function verlet(dTime, koeffDamp) {
            var _local1 = this;
            var _local2 = _local1.pos.duplicate();
            _local1.pos.x = _local1.pos.x + (((_local1.pos.x - _local1.prevPos.x) * koeffDamp) + (_local1.acc.x * dTime));
            _local1.pos.y = _local1.pos.y + (((_local1.pos.y - _local1.prevPos.y) * koeffDamp) + (_local1.acc.y * dTime));
            _local2.copyTo(_local1.prevPos);
            if (_local1.mc != null) {
                _local1.mc._x = _local1.pos.x;
                _local1.mc._y = _local1.pos.y;
            }
        }
    }