语源科技BlogJava-cecily.yuhttp://www.blogjava.net/cecilyyu/~~~~~~~zh-cnMon, 04 May 2026 01:59:11 GMTMon, 04 May 2026 01:59:11 GMT60js Tween算法 水果栋特效http://www.blogjava.net/cecilyyu/archive/2009/09/22/295949.html郁郁Tue, 22 Sep 2009 01:48:00 GMThttp://www.blogjava.net/cecilyyu/archive/2009/09/22/295949.htmlhttp://www.blogjava.net/cecilyyu/comments/295949.htmlhttp://www.blogjava.net/cecilyyu/archive/2009/09/22/295949.html#Feedback0http://www.blogjava.net/cecilyyu/comments/commentRss/295949.htmlhttp://www.blogjava.net/cecilyyu/services/trackbacks/295949.html<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>无标题文档</title>
<script type="text/javascript">
 var Tween = {
  Bounce: {
        easeIn: function(t,b,c,d){
            return c - Tween.Bounce.easeOut(d-t, 0, c, d) + b;
        },
        easeOut: function(t,b,c,d){
            if ((t/=d) < (1/2.75)) {
                return c*(7.5625*t*t) + b;
            } else if (t < (2/2.75)) {
                return c*(7.5625*(t-=(1.5/2.75))*t + .75) + b;
            } else if (t < (2.5/2.75)) {
                return c*(7.5625*(t-=(2.25/2.75))*t + .9375) + b;
            } else {
                return c*(7.5625*(t-=(2.625/2.75))*t + .984375) + b;
            }
        },
        easeInOut: function(t,b,c,d){
            if (t < d/2) return Tween.Bounce.easeIn(t*2, 0, c, d) * .5 + b;
            else return Tween.Bounce.easeOut(t*2-d, 0, c, d) * .5 + c*.5 + b;
        }
    }

 }
 b为初始值 c为变化值 d为持续时间 t为开始时间

d要不配合与步长一起使用  例如

这里的步长为3

d×3 =c-b
 var b=-300,c=600,d=300,t=0;
 function run(){
  var div = document.getElementById("div1");
  div.style.left =  Math.ceil(Tween.Bounce.easeInOut(t,b,c,d))+"px";
  if(t<d){
   t+=3;
   setTimeout(run,10);
 
  }
 }

</script>
</head>

<body onload="run();">
<div style="width:1000px; height:1000px; position:relative; overflow:hidden; background-color:#9966CC">
  <div id="div1" style="width:300px; height:200px; background-color:#0099FF; position:absolute; left:-300px; top:300px;">
  </div>
 </div>
</body>
</html>

 

 

完整Tween算法

var Tween = {

    Linear: function(t,b,c,d){ return c*t/d + b; },

    Quad: {

        easeIn: function(t,b,c,d){

            return c*(t/=d)*t + b;

        },

        easeOut: function(t,b,c,d){

            return -c *(t/=d)*(t-2) + b;

        },

        easeInOut: function(t,b,c,d){

            if ((t/=d/2) < 1) return c/2*t*t + b;

            return -c/2 * ((--t)*(t-2) - 1) + b;

        }

    },

    Cubic: {

        easeIn: function(t,b,c,d){

            return c*(t/=d)*t*t + b;

        },

        easeOut: function(t,b,c,d){

            return c*((t=t/d-1)*t*t + 1) + b;

        },

        easeInOut: function(t,b,c,d){

            if ((t/=d/2) < 1) return c/2*t*t*t + b;

            return c/2*((t-=2)*t*t + 2) + b;

        }

    },

    Quart: {

        easeIn: function(t,b,c,d){

            return c*(t/=d)*t*t*t + b;

        },

        easeOut: function(t,b,c,d){

            return -c * ((t=t/d-1)*t*t*t - 1) + b;

        },

        easeInOut: function(t,b,c,d){

            if ((t/=d/2) < 1) return c/2*t*t*t*t + b;

            return -c/2 * ((t-=2)*t*t*t - 2) + b;

        }

    },

    Quint: {

        easeIn: function(t,b,c,d){

            return c*(t/=d)*t*t*t*t + b;

        },

        easeOut: function(t,b,c,d){

            return c*((t=t/d-1)*t*t*t*t + 1) + b;

        },

        easeInOut: function(t,b,c,d){

            if ((t/=d/2) < 1) return c/2*t*t*t*t*t + b;

            return c/2*((t-=2)*t*t*t*t + 2) + b;

        }

    },

    Sine: {

        easeIn: function(t,b,c,d){

            return -c * Math.cos(t/d * (Math.PI/2)) + c + b;

        },

        easeOut: function(t,b,c,d){

            return c * Math.sin(t/d * (Math.PI/2)) + b;

        },

        easeInOut: function(t,b,c,d){

            return -c/2 * (Math.cos(Math.PI*t/d) - 1) + b;

        }

    },

    Expo: {

        easeIn: function(t,b,c,d){

            return (t==0) ? b : c * Math.pow(2, 10 * (t/d - 1)) + b;

        },

        easeOut: function(t,b,c,d){

            return (t==d) ? b+c : c * (-Math.pow(2, -10 * t/d) + 1) + b;

        },

        easeInOut: function(t,b,c,d){

            if (t==0) return b;

            if (t==d) return b+c;

            if ((t/=d/2) < 1) return c/2 * Math.pow(2, 10 * (t - 1)) + b;

            return c/2 * (-Math.pow(2, -10 * --t) + 2) + b;

        }

    },

    Circ: {

        easeIn: function(t,b,c,d){

            return -c * (Math.sqrt(1 - (t/=d)*t) - 1) + b;

        },

        easeOut: function(t,b,c,d){

            return c * Math.sqrt(1 - (t=t/d-1)*t) + b;

        },

        easeInOut: function(t,b,c,d){

            if ((t/=d/2) < 1) return -c/2 * (Math.sqrt(1 - t*t) - 1) + b;

            return c/2 * (Math.sqrt(1 - (t-=2)*t) + 1) + b;

        }

    },

    Elastic: {

        easeIn: function(t,b,c,d,a,p){

            if (t==0) return b;  if ((t/=d)==1) return b+c;  if (!p) p=d*.3;

            if (!a || a < Math.abs(c)) { a=c; var s=p/4; }

            else var s = p/(2*Math.PI) * Math.asin (c/a);

            return -(a*Math.pow(2,10*(t-=1)) * Math.sin( (t*d-s)*(2*Math.PI)/p )) + b;

        },

        easeOut: function(t,b,c,d,a,p){

            if (t==0) return b;  if ((t/=d)==1) return b+c;  if (!p) p=d*.3;

            if (!a || a < Math.abs(c)) { a=c; var s=p/4; }

            else var s = p/(2*Math.PI) * Math.asin (c/a);

            return (a*Math.pow(2,-10*t) * Math.sin( (t*d-s)*(2*Math.PI)/p ) + c + b);

        },

        easeInOut: function(t,b,c,d,a,p){

            if (t==0) return b;  if ((t/=d/2)==2) return b+c;  if (!p) p=d*(.3*1.5);

            if (!a || a < Math.abs(c)) { a=c; var s=p/4; }

            else var s = p/(2*Math.PI) * Math.asin (c/a);

            if (t < 1) return -.5*(a*Math.pow(2,10*(t-=1)) * Math.sin( (t*d-s)*(2*Math.PI)/p )) + b;

            return a*Math.pow(2,-10*(t-=1)) * Math.sin( (t*d-s)*(2*Math.PI)/p )*.5 + c + b;

        }

    },

    Back: {

        easeIn: function(t,b,c,d,s){

            if (s == undefined) s = 1.70158;

            return c*(t/=d)*t*((s+1)*t - s) + b;

        },

        easeOut: function(t,b,c,d,s){

            if (s == undefined) s = 1.70158;

            return c*((t=t/d-1)*t*((s+1)*t + s) + 1) + b;

        },

        easeInOut: function(t,b,c,d,s){

            if (s == undefined) s = 1.70158; 

            if ((t/=d/2) < 1) return c/2*(t*t*(((s*=(1.525))+1)*t - s)) + b;

            return c/2*((t-=2)*t*(((s*=(1.525))+1)*t + s) + 2) + b;

        }

    },

    Bounce: {

        easeIn: function(t,b,c,d){

            return c - Tween.Bounce.easeOut(d-t, 0, c, d) + b;

        },

        easeOut: function(t,b,c,d){

            if ((t/=d) < (1/2.75)) {

                return c*(7.5625*t*t) + b;

            } else if (t < (2/2.75)) {

                return c*(7.5625*(t-=(1.5/2.75))*t + .75) + b;

            } else if (t < (2.5/2.75)) {

                return c*(7.5625*(t-=(2.25/2.75))*t + .9375) + b;

            } else {

                return c*(7.5625*(t-=(2.625/2.75))*t + .984375) + b;

            }

        },

        easeInOut: function(t,b,c,d){

            if (t < d/2) return Tween.Bounce.easeIn(t*2, 0, c, d) * .5 + b;

            else return Tween.Bounce.easeOut(t*2-d, 0, c, d) * .5 + c*.5 + b;

        }

    }

}

 

参考网址http://www.cnblogs.com/cloudgamer/archive/2009/01/06/Tween.html



郁 2009-09-22 09:48 发表评论
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