运动公式类

1. package{
2.     
3.     public class Tweens{
4.         
5.         public function Tweens(){}
6.         /*
7.         time:运动初始时间，一般为零
8.         begin:运动对象的初始属性 
9.         change:运动对象属性的改变量 
10.         duration:运动持续时间
11.         */
12.         //直线运动
13.         function lineMove(time:Number,begin:Number,change:Number,duration:Number):Number 
14.                  { return change * time / duration + begin;}
15.         
16.         //二次缓入 
17.         function easeInQuad(time:Number,begin:Number,change:Number,duration:Number):Number 
18.                  { return change * (time /=duration)*time + begin; } 
19.         
20.         //二次缓出 
21.         function easeOutQuad(time:Number,begin:Number,change:Number,duration:Number):Number
22.                  { return -change * (time /=duration)*(time-2) + begin; }
23.         
24.         //二次缓入-缓出 
25.          function easeOutQuad(time:Number,begin:Number,change:Number,duration:Number):Number
26.                  { if((time/=duration/2)<1)return change/2*time*time+begin 
27.                    return -change/2 *((--time)*(time-2)-1)+begin }
28.         
29.         //正弦缓动
30.          function easeInSine(time:Number,begin:Number,change:Number,duration:Number):Number
31.                  { return change*(1-Math.cos(time/duration*(Math.PI/2)))+begin} 
33.          function easeOutSine(time:Number,begin:Number,change:Number,duration:Number):Number
34.                  { return change*(1-Math.sin(time/duration*(Math.PI/2)))+begin}
36.         function easeInOutSine(time:Number,begin:Number,change:Number,duration:Number):Number
37.                  { return change/2*(1-Math.cos(Math.PI*time/duration))+begin} 
38.         
39.         //圆形缓动
40.         function easeInCirc(time:Number,begin:Number,change:Number,duration:Number):Number
41.                   { return change*(1-Math.sqrt(1-(time/=duration)*time))+begin} 
43.         function easeOutCirc(time:Number,begin:Number,change:Number,duration:Number):Number
44.                  { return change*Math.sqrt(1-(time=time/duration-1)*time)+begin} 
46.         function easeInOutCirc(time:Number,begin:Number,change:Number,duration:Number):Number
47.                  { if((time/=duration/2)<1){return change/2*(1-Math.sqrt(1-time*time))+begin}
48.                     return change/2*(Math.sqrt(1-(time-=2)*time)+1)+begin} 
49.         //指数缓动
50.         function easeInExpo(time:Number,begin:Number,change:Number,duration:Number):Number
51.                  { return change*Math.pow(2,10*(time/duration-1))+begin}
53.         function easeOutCirc(time:Number,begin:Number,change:Number,duration:Number):Number
54.                  { return change*(Math.pow(2,-10*time/duration)+1)+begin} 
56.         function easeInOutCirc(time:Number,begin:Number,change:Number,duration:Number):Number
57.                  { if((time/=duration/2)<1){return Math.pow(2,10*(time-1))+begin}
58.                     return change/2*(-Math.pow(2,-10*--time)+2)+begin} 
60.         /*
61.         
62.         obj:运动对象
63.         pertype:运动对象属性
64.         begin:运动对象属性初始状态
65.         center:运动中心
66.         factot:运动摩擦系数
67.         
68.         */
69.                     
70.                     
71.         //简谐运动 
72.         function harmonic(obj:*,pertype:String,begin:Number,center:Number,factor:Number):Number{
73.             obj.speed = 0;
74.             obj.pertype=pertype
75.             obj.begin=begin
76.             obj.center=center
77.             obj.factor=factor
78.             obj.onEnterFrame = function() {
79.                  this.speed += (this.center-this.begin)*this.factor 
80.                  this[this.pertype] += this.speed;
81.                  }; 
82.             }
85.         //摩差运动的缓冲 
86.         function buffer(obj:*,pertype:String,begin:Number,center:Number,factor:Number):Number{
87.             obj.pertype=pertype
88.             obj.begin=begin
89.             obj.center=center
90.             obj.factor=factor
91.             obj.onEnterFrame = function() {
92.                  this[this.pertype] += (this.center-this.begin)*this.factor 
93.                  }; 
94.             }
96.         //阻尼运动 
97.         /*
98.         
99.         obj:运动对象
100.         pertype:运动对象属性
101.         r:阻尼运动半径
102.         ang: 阻尼运动角度
103.         factot:阻尼运动系数
104.         
105.         */
106.                     
107.         function damping(obj:*,pertype:String,r:Number,ang:Number,factor:Number):Number{
108.             obj.pertype=pertype
109.             obj.r=r
110.             obj.ang=ang
111.             obj.factor=factor
112.             obj.onEnterFrame = function() {
113.                  this[this.pertype] += Math.sin(this.ang)*this.r*this.factor
114.                  this.ang+=1
115.                  }; 
116.             }
119.         }
120.     
121.     }