egret tween 屏幕震动动画 ts

let orig = { x: this.x, y: this.y };
        var dir = 1;
        var tox = 0;
        var toy = 0;
        var count = 40;

        // if (null != _Timer) egret.clearInterval(this.m_Timer);
        var timer = egret.setInterval(
            () => {
                count--
                dir = 0.5 < Math.random() ? -1 : 1;
                tox = Math.floor(8 * dir * Math.random());
                dir = 0.5 < Math.random() ? -1 : 1;
                toy = Math.floor(8 * dir * Math.random());
                console.log("-----------------x: " + tox + "----------y: " + toy);
                if (10 >= count) {
                    var tw = egret.Tween.get(this);
                    tw.to({ x: tox, y: toy }, 50)
                }
                console.log("-----------------this.x: " + this.x + "----------this.y: " + this.y);
                if (0 >= count) {
                    if (null != timer) egret.clearInterval(timer);
                    this.x = orig.x;
                    this.y = orig.y;
                }
            }, this, 50);

 思路就是控制震动启动和结束时间，在一定时间内，移动object的x，y的位置，必现控制在一定的移动范围