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Tween algorithm and buffering effects example code implemented in JavaScript_javascript skills

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Release： 2016-05-16 15:33:50
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The example in this article describes the Tween algorithm and buffering effects implemented in JavaScript. Share it with everyone for your reference, the details are as follows:

Here is a demonstration of the Tween algorithm and JavaScript code for buffering special effects. You can use it to create many animation effects such as easing and spring. How to use the Tween algorithm of flash to make the Tween algorithm of js and use it to do some simple things. As for the easing effect, you will understand it after reading this code.

The screenshot of the running effect is as follows:

The online demo address is as follows:

http://demo.jb51.net/js/2015/js-tween-run-style-codes/

The specific code is as follows: 

<!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>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-top:50px;">
  <div id="idChart" style="border:1px solid #000;height:200px;"> </div>
  <div id="idLine" style="position:absolute;top: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 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) &#63; b : c * Math.pow(2, 10 * (t/d - 1)) + b;
 },
 easeOut: function(t,b,c,d){
  return (t==d) &#63; 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;
 }
 }
}
var $ = function (id) {
 return "string" == typeof id &#63; 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;top:' + (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" &#63; 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>
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I hope this article will be helpful to everyone in JavaScript programming.

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