cocos js 自定义抖动动作

 1 /**
 2  * 自定义抖动动作
 3  */
 4 var Shake = cc.ActionInterval.extend({
 5     //节点初始位置
 6     nodeInitialPos:null,
 7     //X轴抖动幅度
 8     nodeShakeStrengthX:0,
 9     //Y轴抖动幅度
10     nodeShakeStrengthY:0,
11     //抖动时间
12     duration:0,
13     ctor:function(duration,shakeStrengthX,shakeStrengthY){
14         cc.ActionInterval.prototype.ctor.call(this);
15         this.duration = duration;
16         this.initWithDuration(duration,shakeStrengthX,shakeStrengthY);
17 
18     },
19     //获取两个数间的随机值
20     getRandomStrength:function(min,max){
21         return Math.random()*(max-min+1)+min;
22     },
23     update:function(dt){
24         var randX=this.getRandomStrength(-this.nodeShakeStrengthX,this.nodeShakeStrengthX)*dt;
25         var randY=this.getRandomStrength(-this.nodeShakeStrengthY,this.nodeShakeStrengthY)*dt;
26 //        cc.log("randX:"+randX+",randY="+randY);
27         this.target.setPosition(cc.pAdd(this.nodeInitialPos,cc.p(randX,randY)));
28     },
29     initWithDuration:function(duration,shakeStrengthX,shakeStrengthY){
30         if (cc.ActionInterval.prototype.initWithDuration.call(this, duration)) {
31             this.nodeShakeStrengthX=shakeStrengthX;
32             this.nodeShakeStrengthY=shakeStrengthY==‘undefined‘?shakeStrengthX:shakeStrengthY;
33             return true;
34         }
35         return false;
36     },
37     startWithTarget:function(target){
38         cc.ActionInterval.prototype.startWithTarget.call(this, target);
39         this.nodeInitialPos=target.getPosition();
40     },
41     stop:function(){
42         this.target.setPosition(this.nodeInitialPos);
43     }
44 });
45 /**
46  * 自定义抖动动作
47  * @param {float}duration 抖动时间
48  * @param {number}shakeStrengthX X轴抖动幅度
49  * @param {number}shakeStrengthY Y轴抖动幅度
50  * @returns {Shake}
51  */
52 cc.shake = function(duration,shakeStrengthX,shakeStrengthY){
53     return new Shake(duration,shakeStrengthX,shakeStrengthY);
54 };

1 var action = cc.shake(0.4,20,20);
2 xx.runAction(action);