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:; padding:;}
li{list-style: none; }
body{font-size:11px;}
a{text-decoration: none;}
.pop_see_360pic:after {clear:both;display:block;content:".";height:;visibility:hidden;font-size:;line-height:;}
.pop_see_360pic {position:relative;float:left;width:550px;padding:14px 70px 14px 71px;border:1px solid #CECECE;background-color:#FFFFFF;zoom:;}
.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:;}
.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:;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:;}
: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:; left:; 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:; text-indent: -999px;}
.pic_box_inner{position:absolute; width:5000px; overflow: hidden; *zoom:;}
.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