JavaScript实现的Tween算法及缓冲特效实例代码
网络编程 2021-07-04 21:03www.168986.cn编程入门
这篇文章主要介绍了JavaScript实现的Tween算法及缓冲特效,涉及JavaScript通过数学运算及样式属性操作实现缓动、弹性运动等效果,具有一定参考借鉴价值,需要的朋友可以参考下
本文实例讲述了JavaScript实现的Tween算法及缓冲特效。分享给大家供大家参考，具体如下
这里演示Tween 算法及缓冲特效的JavaScript代码，利用它可以做缓动、弹簧等很多动画效果，怎么利用flash的Tween类的算法，来做js的Tween算法，并利用它做一些简单的缓动效果呢，看懂了本代码你就明白了。
运行效果截图如下
在线演示地址如下
具体代码如下
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://.w3./TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://.w3./1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>Tween</title>
</head>
<body>
<div style="padding-left:50px;">
<div style="position:relative; border:1px solid #000000; width:550px; height:50px;">
<div id="idMove" style="width:50px; height:50px; background:#930; position:absolute;"></div>
</div>
<div style="position:relative;width:550px;height:200px; margin-:50px;">
<div id="idChart" style="border:1px solid #000;height:200px;"> </div>
<div id="idLine" style="position:absolute;:0;left:0;height:200px;width:1px;background:#000;"></div>
</div>
</div>
<div>
<p> Tween类型 <br />
<label>
<input name="vTween" type="radio" value="Linear" checked="checked" />
Linear </label>
<label>
<input name="vTween" type="radio" value="Quad" />
Quadratic </label>
<label>
<input name="vTween" type="radio" value="Cubic" />
Cubic </label>
<label>
<input name="vTween" type="radio" value="Quart" />
Quartic </label>
<label>
<input name="vTween" type="radio" value="Quint" />
Quintic </label>
<label>
<input name="vTween" type="radio" value="Sine" />
Sinusoidal </label>
<br />
<label>
<input name="vTween" type="radio" value="Expo" />
Exponential </label>
<label>
<input name="vTween" type="radio" value="Circ" />
Circular </label>
<label>
<input name="vTween" type="radio" value="Elastic" />
Elastic </label>
<label>
<input name="vTween" type="radio" value="Back" />
Back </label>
<label>
<input name="vTween" type="radio" value="Bounce" />
Bounce </label>
</p>
<p> ease类型 <br />
<label>
<input name="vEase" type="radio" value="easeIn" checked="checked" />
easeIn </label>
<label>
<input name="vEase" type="radio" value="easeOut" />
easeOut </label>
<label>
<input name="vEase" type="radio" value="easeInOut" />
easeInOut </label>
</p>
<input id="idSpeed" type="button" value="减慢速度" />
<input id="idRun" type="button" value=" Run " />
</div>
<script>
var Tween = {
Linear: function(t,b,c,d){ return ct/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/2tt + b;
return -c/2 ((--t)(t-2) - 1) + b;
}
},
Cubic: {
easeIn: function(t,b,c,d){
return c(t/=d)tt + b;
},
easeOut: function(t,b,c,d){
return c((t=t/d-1)tt + 1) + b;
},
easeInOut: function(t,b,c,d){
if ((t/=d/2) < 1) return c/2ttt + b;
return c/2((t-=2)tt + 2) + b;
}
},
Quart: {
easeIn: function(t,b,c,d){
return c(t/=d)ttt + b;
},
easeOut: function(t,b,c,d){
return -c ((t=t/d-1)ttt - 1) + b;
},
easeInOut: function(t,b,c,d){
if ((t/=d/2) < 1) return c/2tttt + b;
return -c/2 ((t-=2)ttt - 2) + b;
}
},
Quint: {
easeIn: function(t,b,c,d){
return c(t/=d)tttt + b;
},
easeOut: function(t,b,c,d){
return c((t=t/d-1)tttt + 1) + b;
},
easeInOut: function(t,b,c,d){
if ((t/=d/2) < 1) return c/2ttttt + b;
return c/2((t-=2)tttt + 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.PIt/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 - tt) - 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/(2Math.PI) Math.asin (c/a);
return -(aMath.pow(2,10(t-=1)) Math.sin( (td-s)(2Math.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/(2Math.PI) Math.asin (c/a);
return (aMath.pow(2,-10t) Math.sin( (td-s)(2Math.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(.31.5);
if (!a || a < Math.abs(c)) { a=c; var s=p/4; }
else var s = p/(2Math.PI) Math.asin (c/a);
if (t < 1) return -.5(aMath.pow(2,10(t-=1)) Math.sin( (td-s)(2Math.PI)/p )) + b;
return aMath.pow(2,-10(t-=1)) Math.sin( (td-s)(2Math.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(tt(((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(7.5625tt) + 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(t2, 0, c, d) .5 + b;
else return Tween.Bounce.easeOut(t2-d, 0, c, d) .5 + c.5 + b;
}
}
}
var $ = function (id) {
return "string" == typeof id ? document.getElementById(id) : id;
};
var Each = function(list, fun){
for (var i = 0, len = list.length; i < len; i++) { fun(list[i], i); }
};
var fun, iChart = 550, iDuration = 100;
function Move(){
var oM = $("idMove").style, oL = $("idLine").style, t=0, c=500, d=iDuration;
oM.left=oL.left="0px"; clearTimeout(Move._t);
function _run(){
if(t<d){
t++;
oM.left = Math.ceil(fun(t,0,c,d)) + "px";
oL.left = Math.ceil(Tween.Linear(t,0,iChart,d)) + "px";
Move._t = setTimeout(_run, 10);
}else{
oM.left = c + "px";
oL.left = iChart + "px";
}
}
_run();
}
function Chart(){
var a = [];
for (var i = 0; i < iChart; i++) {
a.push('<div style="background-color:#f60;font-size:0;width:3px;height:3px;position:absolute;left:' + (i-1) + 'px;:' + (Math.ceil(fun(i,200,-200,iChart))) + 'px;"><\/div>');
}
$("idChart").innerHTML = a.join("");
}
var arrTween = document.getElementsByName("vTween");
var arrEase = document.getElementsByName("vEase");
Each(arrTween, function(o){ o.onclick = function(){ SetFun(); Chart(); } })
Each(arrEase, function(o){ o.onclick = function(){ SetFun(); Chart(); } })
function SetFun(){
var sTween, sEase;
Each(arrTween, function(o){ if(o.checked){ sTween = o.value; } })
Each(arrEase, function(o){ if(o.checked){ sEase = o.value; } })
fun = sTween == "Linear" ? Tween.Linear : Tween[sTween][sEase];
}
$("idRun").onclick = function(){ SetFun(); Chart(); Move(); }
$("idSpeed").onclick = function(){
if(iDuration == 100){
iDuration = 500; this.value = "加快速度";
}else{
iDuration = 100; this.value = "减慢速度";
}
}
</script>
</body>
</html>
希望本文所述对大家JavaScript程序设计有所帮助。
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