cc.Shake = cc.Class({
    name: "cc.Shake",
    extends:cc.ActionInterval,

    _initial_x: 0,
    _initial_y: 0,
    _strength_x: 0,
    _strength_y: 0,
    ctor(duration, strength_x, strength_y) {
        this.initWithDuration(duration, strength_x, strength_y);
    },
    initWithDuration(duration, strength_x, strength_y) {
        cc.ActionInterval.prototype.initWithDuration.call(this, duration)
        this._strength_x = strength_x;
        this._strength_y = strength_y;
        return true;
    },
    rangeRand(min, max) {
        let rnd = Math.random();
        return rnd * (max - min) + min;
    },
    update() {
        let randx = this.rangeRand(-this._strength_x, this._strength_x);
        let randy = this.rangeRand(-this._strength_y, this._strength_y);
        this.getTarget().setPosition(randx + this._initial_x, randy + this._initial_y);
    },
    startWithTarget(target) {
        cc.ActionInterval.prototype.startWithTarget.call(this, target);
        this._initial_x = target.x;
        this._initial_y = target.y;
    },
    stop() {
        this.getTarget().setPosition(new cc.Vec2(this._initial_x, this._initial_y));
        cc.ActionInterval.prototype.stop.call(this);
    },
});
cc.shake = function (duration, strength_x, strength_y) {
    return new cc.Shake(duration, strength_x, strength_y);
};