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JS implements 3D image rotation display effect code_javascript skills

WBOYOriginal: 2016-05-16 15:38:261784browse

The example in this article describes the JS code to implement 3D image rotation display effect. Share it with everyone for your reference. The details are as follows:

This is a piece of JavaScript code that rotates and displays the code around a JavaScript image in a 3D model style. For the convenience of demonstration, the image is replaced with a number and the position of the image is reserved. This is faster for those who know HTML. Everyone knows what to do when using it. This picture rotation requires manual control. Every time you click, the picture rotates once, which is very convenient.

The screenshot of the running effect is as follows:

The online demo address is as follows:

http://demo.jb51.net/js/2015/js-3d-pic-scroll-show-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=utf-8" />
<title>图片旋转展示</title>
<style>
#show{position:relative;margin:20px auto;width:800px;border:1px solid #999999;}
.item{position:absolute;height:40px;width:60px;background:#999999;border:1px solid #eeeeee;cursor:pointer;}
</style>
<script>
var len;
var showerObj;
var listObj;
var showerWidth=800;
var showerHeight=400;
var r;
var cR=0;
var ccR=0;
var timer=0;
window.onload=function(){
 showerObj=document.getElementById("show");
 listObj=showerObj.getElementsByTagName("div");
 len=listObj.length;
 r=Math.PI/180*360/len;
 for(var i=0;i<len;i++){
  var item=listObj[i];
  item.style.top=showerHeight/2+Math.sin(r*i)*showerWidth/2-20+"px";
  item.style.left=showerWidth/2+Math.cos(r*i)*showerWidth/2-30+"px";
  item.rotate=(r*i+2*Math.PI)%(2*Math.PI);
  item.onclick=function(){
   cR=Math.PI/2-this.rotate;
   timer || (timer=setInterval(rotate,10));
  }
 }
 var rX=showerObj.offsetLeft+showerWidth/2;
 var ry=showerObj.offsetTop+showerHeight/2;
 var rotate=function(){
  ccR=(ccR+2*Math.PI)%(2*Math.PI);
  if(cR-ccR<0) cR=cR+2*Math.PI;
  if(cR-ccR<Math.PI){
   ccR=ccR+(cR-ccR)/19;
  }else{
   ccR=ccR-(2*Math.PI+ccR-cR)/19;
  }
  if(Math.abs((cR+2*Math.PI)%(2*Math.PI)-(ccR+2*Math.PI)%(2*Math.PI))<Math.PI/720){
   ccR=cR;
   clearInterval(timer);
   timer=0;
  }
  for(var i=0;i<len;i++){
   var item=listObj[i];
   var w,h;
   var sinR=Math.sin(r*i+ccR);
   var cosR=Math.cos(r*i+ccR);
   w=60+0.6*60*sinR;
   h=(40+0.6*40*sinR);
   item.style.cssText +=";width:"+w+"px;height:"+h+"px;top:"+parseInt(showerHeight/2+sinR*showerWidth/2/3-w/2)+"px;left:"+parseInt(showerWidth/2+cosR*showerWidth/2-h/2)+"px;z-index:"+parseInt(showerHeight/2+sinR*showerWidth/2/3-w/2)+";";
  }
 }
 document.getElementById("l").onclick=function(){
  cR=(cR+r+2*Math.PI)%(2*Math.PI);
  timer || (timer=setInterval(rotate,10));
 }
 document.getElementById("r").onclick=function(){
  cR=(cR-r+2*Math.PI)%(2*Math.PI);
  timer || (timer=setInterval(rotate,10));
 }
 rotate();
}
</script>
</head>
<body>
<input id="l" type="button" value="left" >
<input id="r" type="button" value="right" >
<div id="show">
 <div class="item">1</div>
 <div class="item">2</div>
 <div class="item">3</div>
 <div class="item">4</div>
 <div class="item">5</div>
 <div class="item">6</div>
 <div class="item">7</div>
 <div class="item">8</div>
 <div class="item">9</div>
 <div class="item">0</div>
 <div class="item">a</div>
 <div class="item">b</div>
 <div class="item">1</div>
 <div class="item">2</div>
 <div class="item">3</div>
</div>
</body>
</html>

I hope this article will be helpful to everyone’s JavaScript programming.

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