CParticleEngine

    class CParticleEngine
    {
        var hit_mc, prevTime;
        function CParticleEngine () {
        }
        function clear() {
            var _local1 = this;
            while (_local1.p_array.pop() != undefined) {
            }
            while (_local1.w_array.pop() != undefined) {
            }
            while (_local1.c_array.pop() != undefined) {
            }
        }
        function setHitMovie(hit_mc_) {
            hit_mc = hit_mc_;
        }
        function addParticle(p) {
            p_array.push(p);
        }
        function addWheel(wheel, p, maxSpeed, radius) {
            wheel.init(p, maxSpeed, radius);
            w_array.push(wheel);
        }
        function addSpringConstraint(p1, p2, koeffStiff1, koeffStiff2) {
            var _local1 = new CSpringConstraint(p1, p2, koeffStiff1, koeffStiff2);
            c_array.push(_local1);
        }
        function start() {
            prevTime = getTimer();
        }
        function computeForces() {
            var _local2 = this;
            var _local1;
            var _local3 = _local2.p_array.length;
            _local1 = 0;
            while (_local1 < _local3) {
                _local2.p_array[_local1].acc.x = 0;
                _local2.p_array[_local1].acc.y = _local2.gravity * _local2.p_array[_local1].mass;
                _local1++;
            }
        }
        function clearForces() {
            var _local3 = w_array.length;
            var _local1;
            var _local2;
            _local1 = 0;
            while (_local1 < _local3) {
                _local2 = w_array[_local1];
                _local2.addedAcc.x = (_local2.addedAcc.y = 0);
                _local1++;
            }
        }
        function applyManFrictions() {
            var _local3 = this;
            var _local2 = _local3.w_array.length;
            var _local1;
            _local1 = 0;
            while (_local1 < _local2) {
                _local3.w_array[_local1].applyAddedAcc();
                _local1++;
            }
        }
        function verlet(dTime) {
            var _local2 = this;
            var koeffDamp = 0.995;
            var _local1;
            var _local3 = _local2.p_array.length;
            _local1 = 0;
            while (_local1 < _local3) {
                _local2.p_array[_local1].verlet(dTime, koeffDamp);
                _local1++;
            }
            _local3 = _local2.w_array.length;
            var acc = 0;
            if (Key.isDown(40)) {
                acc = -0.6;
            } else if (Key.isDown(38)) {
                acc = 1;
            }
            _local1 = 0;
            while (_local1 < _local3) {
                _local2.w_array[_local1].process(dTime, (_local2.w_array[_local1].maxAccSpeed * acc) / 3.2, 0.99);
                _local1++;
            }
        }
        function checkCollisions() {
            var _local2 = this;
            var _local1;
            var _local3 = _local2.w_array.length;
            _local1 = 0;
            while (_local1 < _local3) {
                _local2.w_array[_local1].checkCollision(_local2.hit_mc);
                _local1++;
            }
        }
        function checkConstraints(dTime) {
            var _local3 = this;
            var _local1;
            var _local2 = _local3.c_array.length;
            _local1 = 0;
            while (_local1 < _local2) {
                _local3.c_array[_local1].resolve(dTime);
                _local1++;
            }
        }
        function process() {
            var _local1 = this;
            var curTime = getTimer();
            var dTime = ((curTime - _local1.prevTime) / 1000);
            _local1.prevTime = curTime;
            var _local2;
            var _local3 = Math.min(Math.round(dTime / _local1.t), _local1.maxSteps);
            _local2 = 0;
            while (_local2 < _local3) {
                _local1.computeForces();
                _local1.applyManFrictions();
                _local1.verlet(_local1.t);
                _local1.checkConstraints(_local1.t);
                _local1.checkCollisions();
                _local2++;
            }
            _local1.clearForces();
        }
        var p_array = new Array();
        var w_array = new Array();
        var c_array = new Array();
        var t = 0.02;
        var maxSteps = 2;
        var gravity = 3.15;
    }