# Cocos Creator 摄像机抖动算法

By [DorokGo](https://paragraph.com/@dorokgo) · 2021-12-05

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将下面脚本放到项目中去 然后调用

    var action = cc.shake(0.4,15,15); this.node.runAction(action);
    

以下为代码：

    /**
     * 自定义抖动动作
     */
    var Shake = cc.ActionInterval.extend({
        //节点初始位置
        nodeInitialPos:null,
        //X轴抖动幅度
        nodeShakeStrengthX:0,
        //Y轴抖动幅度
        nodeShakeStrengthY:0,
        //抖动时间
        duration:0,
        ctor:function(duration,shakeStrengthX,shakeStrengthY){
            cc.ActionInterval.prototype.ctor.call(this);
            this.duration = duration;
            this.initWithDuration(duration,shakeStrengthX,shakeStrengthY);
        },
        //获取两个数间的随机值
        getRandomStrength:function(min,max){
            return Math.random()*(max-min+1)+min;
        },
        update:function(dt){
            var randX=this.getRandomStrength(-this.nodeShakeStrengthX,this.nodeShakeStrengthX)*dt;
            var randY=this.getRandomStrength(-this.nodeShakeStrengthY,this.nodeShakeStrengthY)*dt;
    //        cc.log("randX:"+randX+",randY="+randY);
            this.target.setPosition(cc.pAdd(this.nodeInitialPos,cc.p(randX,randY)));
        },
        initWithDuration:function(duration,shakeStrengthX,shakeStrengthY){
            if (cc.ActionInterval.prototype.initWithDuration.call(this, duration)) {
                this.nodeShakeStrengthX=shakeStrengthX;
                this.nodeShakeStrengthY=shakeStrengthY=='undefined'?shakeStrengthX:shakeStrengthY;
                return true;
            }
            return false;
        },
        startWithTarget:function(target){
            cc.ActionInterval.prototype.startWithTarget.call(this, target);
            this.nodeInitialPos=target.getPosition();
        },
        stop:function(){
            this.target.setPosition(this.nodeInitialPos);
        }
    });
    /**
     * 自定义抖动动作
     * @param {float}duration 抖动时间
     * @param {number}shakeStrengthX X轴抖动幅度
     * @param {number}shakeStrengthY Y轴抖动幅度
     * @returns {Shake}
     */
    cc.shake = function(duration,shakeStrengthX,shakeStrengthY){
        return new Shake(duration,shakeStrengthX,shakeStrengthY);
    };

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*Originally published on [DorokGo](https://paragraph.com/@dorokgo/cocos-creator)*