JavaScript实现360度全景图片展示效果

全景拍摄：所谓“全景拍摄”就是将所有拍摄的多张图片拼成一张全景图片。它的基本拍摄原理是搜索两张图片的边缘部分，并将成像效果最为接近的区域加以重合，以完成图片的自动拼接。现在的智能手机也基本带这个功能。

这个小DEMO基于全景图片的左右边缘较为接近且适宜自动拼接与jser熟知的无缝滚动原理。下面这个图片就是本DEMO实现原理的简化图。



HTML代码

<div class="pop_see_360pic" style="" id="popseebox">
<div class="pic_box">
<div class="loading" id="pic360load">Loading...</div>
<div class="pic_box_inner" id="pic_box_inner">
<img src="">
</div>
<a href="javascript:void(0)" class="prev_arrow" id="prev"><span>←</span></a> <a href="javascript:void(0)" class="pause_arrow" id="pause"><span>‖</span></a> <a href="javascript:void(0)" class="next_arrow" id="next"><span>→</span></a>
</div>
<div class="pic_list">
<ul id="picListItem">
<li><a href="javascript:void(0)" class="sel">Standard Room</a></li>
<li><a href="javascript:void(0)" imgurl="http://ued.ctrip.com/blog/wp-content/uploads/2012/12/hotel_1.jpg">Sea view Room (PVSU1)</a></li>
<li><a href="javascript:void(0)" imgurl="http://ued.ctrip.com/blog/wp-content/uploads/2012/12/hotel_2.jpg">Royale Suite</a></li>
<li><a href="javascript:void(0)" imgurl="http://ued.ctrip.com/blog/wp-content/uploads/2012/12/hotel_3.jpg">Bella Suite</a></li>
<li><a href="javascript:void(0)" imgurl="http://ued.ctrip.com/blog/wp-content/uploads/2012/12/hotel_4.jpg">11Royale Suite (PVSU1)</a></li>
<li><a href="javascript:void(0)" imgurl="http://ued.ctrip.com/blog/wp-content/uploads/2012/12/hotel_5.jpg">Royale Suite</a></li>
<li><a href="javascript:void(0)" imgurl="http://ued.ctrip.com/blog/wp-content/uploads/2012/12/hotel_6.jpg">Bella Suite</a></li>
<li><a href="javascript:void(0)" imgurl="http://ued.ctrip.com/blog/wp-content/uploads/2012/12/hotel_7.jpg">Royale Suite (PVSU1)</a></li>
</ul>
</div>
<a href="javascript:void(0)" class="mbtn mbtn-mini" id="close">X</a>
</div>　

CSS代码：

*{margin:0; padding:0;}
li{list-style: none; }
body{font-size:11px;}
a{text-decoration: none;}
.pop_see_360pic:after {clear:both;display:block;content:".";height:0;visibility:hidden;font-size:0;line-height:0;}
.pop_see_360pic {position:relative;float:left;width:550px;padding:14px 70px 14px 71px;border:1px solid #CECECE;background-color:#FFFFFF;zoom:1;}
.pop_see_360pic_fla {width:650px;padding:20px 40px 14px 0;}
.pop_see_360pic .mbtn {position:absolute;top:12px;right:20px;}
.pop_see_360pic .pic_box {position:relative;float:left;width:320px;height:240px;overflow:hidden;margin-right:10px;}
.pop_see_360pic .pic_box img {display:block;width:320px;height:240px;}
.pop_see_360pic .pic_list {float:left;width:220px;height:240px;overflow-x:hidden;overflow-y:auto;}
.pop_see_360pic .pic_list ul {overflow:hidden;width:218px;border:1px solid #CECECE;border-bottom:0 none;}
.pop_see_360pic .pic_list li {float:left;width:218px;height:35px;font-weight:bold;border-bottom:1px solid #CECECE;}
.pop_see_360pic .pic_list li a {display:block;width:100%;height:18px;overflow:hidden;padding:9px 10px 8px 10px;zoom:1;}
.pop_see_360pic .pic_list li a:hover {text-decoration:none;background-color:#EFF0F1;}
.pop_see_360pic .pic_list li a.sel,
.pop_see_360pic .pic_list li a.sel:hover {text-decoration:none;background-color:#C1D3F1;}
.pop_see_360pic .prev_arrow,
.pop_see_360pic .pause_arrow,
.pop_see_360pic .next_arrow {position:absolute;left:124px;bottom:0;width:70px;height:27px;overflow:hidden;padding-top:17px;text-align:center;font-size:12px;filter:progid:DXImageTransform.Microsoft.gradient(enabled='true',startColorstr='#7FFFFFFF', endColorstr='#7FFFFFFF');background:url(about:blank);background:rgba(255,255,255,0.5);z-index:9;}
:root .pop_see_360pic .prev_arrow,
:root .pop_see_360pic .pause_arrow,
:root .pop_see_360pic .next_arrow {filter:none;}
.pop_see_360pic .prev_arrow {left:53px;border-radius:10px 0 0 0;}
.pop_see_360pic .next_arrow {left:195px;border-radius:0 10px 0 0;}
.pop_see_360pic .prev_arrow:hover,
.pop_see_360pic .pause_arrow:hover,
.pop_see_360pic .next_arrow:hover {font-size:11px;}
.pop_see_360pic .pic_box img {width: auto;height: 240px;}
.pop_see_360pic{margin:10px;}
.pop_see_360pic .loading{position: absolute; top:0; left:0; background:#ebebeb url(http://www.cocss.com/wp-content/uploads/2012/12/loading_50_g.gif) no-repeat 134px 78px; width: 320px; height:240px; z-index:998; text-indent: -999px;}
.pic_box_inner{position:absolute; width:5000px; overflow: hidden; *zoom:1;}
.pic_box_inner img{float:left;}

JavaScript代码：

var pic360play = function(){this.initialize()}

pic360play.prototype = {
initialize : function(){
var oThis = this;

this.popseebox = document.getElementById("popseebox");
this.pic360load = document.getElementById("pic360load");

this.oPrev = document.getElementById("prev");
this.opause = document.getElementById("pause");
this.oNext = document.getElementById("next");

this.timeout = 0;
this.picList = document.getElementById("picListItem");
this.oScrollIner = document.getElementById("pic_box_inner");
this.oScrollBox = this.oScrollIner.parentNode;
this.oScrollImg = this.oScrollBox.getElementsByTagName("img")[0];

/* ============= copy img for scrool no space =========== */
this.oScrollImgcopy = this.oScrollImg.cloneNode(true);
this.oScrollIner.appendChild(this.oScrollImgcopy);

/* =========== bind close pic360play popup event ========== */
document.getElementById("close").onclick = function(){
oThis.close(popseebox);
}

/* ============== reset first img and layout ===============*/
oThis.resetImg();

/* ============== give per link tabs pic =================*/
oThis.picList.onclick = function(e) {
e = window.event ? window.event : e;
var who = e.target ? e.target : e.srcElement;
if(who.nodeType == 1 && who.tagName == "A" && who.getAttribute("imgurl") && oThis.oScrollImgcopy.src != who.getAttribute("imgurl")){
oThis.pic360load.style.display = "block";
var newimg = new Image();
newimg.src = who.getAttribute("imgurl");
newimg.onload = function(){
oThis.oScrollImg.src = oThis.oScrollImgcopy.src = who.getAttribute("imgurl");
oThis.oScrollImg = oThis.oScrollBox.getElementsByTagName("img")[0];
oThis.oScrollImgcopy = oThis.oScrollBox.getElementsByTagName("img")[1];
oThis.pic360load.style.display = "none";
clearTimeout(oThis.timeout);
oThis.resetMiddle();
oThis.timeout = setInterval(function(){
oThis.prev(oThis);
},16);

}

return false;
}
};
/* ============ play pic ============= */
this.oPrev.onclick = function(){
clearTimeout(oThis.timeout);
oThis.timeout = setInterval(function(){
oThis.prev();
},16);
}

this.oNext.onclick = function(){
clearTimeout(oThis.timeout);
oThis.timeout = setInterval(function(){
oThis.next();
},16);

}

this.opause.onclick = function(){
clearTimeout(oThis.timeout);
}
},
getStyle : function(elem,name){
if(elem.style[name]){
return elem.style[name];
}
else if(elem.currentStyle){
return elem.currentStyle[name];
}
else if(document.defaultView && document.defaultView.getComputedStyle){
name = name.replace(/[A-Z]/g,"-$1");
name = name.toLowerCase();
var s = document.defaultView.getComputedStyle(elem,'');
return s && s.getPropertyValue(name);
}
return null;
},
prev : function(){
if(parseFloat(this.oScrollIner.style.left) < -(this.oScrollImg.width + parseFloat(this.getStyle(this.oScrollBox,"width"))) ){
this.oScrollIner.style.left = parseFloat(this.oScrollIner.style.left) + this.oScrollImg.width + "px";
}
this.oScrollIner.style.left = parseFloat(this.oScrollIner.style.left) - 1 + "px";

},
opause : function(){
clearTimeout(this.timeout);
},
next : function(){
if(parseFloat(this.oScrollIner.style.left) > parseFloat(this.getStyle(this.oScrollBox,"width")) - this.oScrollImg.width)
this.oScrollIner.style.left =  parseFloat(this.oScrollIner.style.left) - this.oScrollImg.width + "px";
this.oScrollIner.style.left = parseFloat(this.oScrollIner.style.left) + 1 + "px";
},
close : function(obj){
obj.style.display = "none";
return false;
},
resetImg : function(){
var picListItemLink = this.picList.getElementsByTagName("a");
var oThis = this;
oThis.oScrollImg.src = oThis.oScrollImgcopy.src = picListItemLink[1].getAttribute("imgurl");
var resetImg = new Image();
resetImg.src= picListItemLink[1].getAttribute("imgurl");

resetImg.onload = function(){
//reset img location middle
oThis.resetMiddle();

oThis.pic360load.style.display = "none";

oThis.timeout = setInterval(function(){
oThis.prev(oThis);
},16);
}
},
resetMiddle: function(){
this.oScrollIner.style.left = - (this.oScrollImg.width/2 - parseFloat(this.getStyle(this.oScrollBox,"width"))/2) + "px";
}
}

new pic360play();

转自：携程设计委员会