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
