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Beispielcode für Tween-Algorithmus und Puffereffekte, implementiert in JavaScript_Javascript-Kenntnissen

WBOY
WBOYOriginal
2016-05-16 15:33:501149Durchsuche

Das Beispiel in diesem Artikel beschreibt den in JavaScript implementierten Tween-Algorithmus und die Puffereffekte. Teilen Sie es als Referenz mit allen. Die Details lauten wie folgt:

Hier ist eine Demonstration des Tween-Algorithmus und des JavaScript-Codes zum Puffern von Spezialeffekten. Sie können damit viele Animationseffekte wie Easing und Spring erstellen. So erstellen Sie den Tween-Algorithmus von js und Verwenden Sie es, um einige einfache Dinge zu tun. Den Erleichterungseffekt werden Sie verstehen, nachdem Sie diesen Code gelesen haben.

Der Screenshot des Laufeffekts sieht wie folgt aus:

Die Online-Demo-Adresse lautet wie folgt:

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

Der spezifische Code lautet wie folgt:

<!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>

Ich hoffe, dass dieser Artikel für alle hilfreich ist, die sich mit der JavaScript-Programmierung befassen.

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