[JavaScript案例]360度全景照片

時間 2019-12-01

原文原文鏈接

案例: 360度全景照片鼠標在頁面上滑動時圖片表現的物體會隨着移動方向進行旋轉，從而呈現360度物體旋轉效果javascript

思路: 將全部的圖片都放入指定容器內，經過切換相應的照片隱藏與顯示來實現旋轉效果html

代碼:java

<!DOCTYPE html>
<html lang="zh-CN">
    <head>
        <meta charset="UTF-8">
        <meta id="viewport" name="viewport" content="width=device-width,initial-scale=1.0,user-scalable=no">
        <title>Document</title>
        <script type="text/javascript" src="360.js"></script>
    </head>
    <body>
        <div class="container" id="page750">
            <img src="img/1.png">
        </div>
    </body>
</html>

html,body{
    margin: 0;
    padding: 0;
}
.container{
    display: flex;
}
img{
    display: block;
    margin: auto;
}

window.onload = function(){
    var container = document.getElementById("page750");
    /*
        一次性將全部的圖片標籤加入
     */
    var imgCount = 40;
    var lastStartX = 0;
    var iSpeed = 0;
    var timer;
    var _disX;
    for(var i = 2; i <= imgCount; i++){
        (function(i){
            var img = new Image();
            var imgNode = document.createElement("img");
            img.onload = function(){
                imgNode.src = this.src;
                imgNode.style.display = "none";
                container.appendChild(imgNode);
            };
            img.src = "img/"+i+".png";}
        )(i);
    }
    var imgNodes = container.getElementsByTagName("img");
    var lastImgNode = container.getElementsByTagName("img")[0];

    var startX = 0;
    function mouseDownHandler(event){
        console.log("mouse down");
        clearInterval(timer);
        startX = event.clientX;
        document.addEventListener("mousemove", mouseMoveHandler);
        document.addEventListener("mouseup", mouseUpHandler);
        return false;
    }
    function mouseMoveHandler(event){
        console.log("mouse move");
        disX = event.clientX - startX;
        move();
        iSpeed = _disX - lastStartX;
        lastStartX = _disX;
        document.title = _disX;
        return false;
    }
    function mouseUpHandler(event){
        console.log("mouse up");
        document.removeEventListener("mousemove", mouseMoveHandler);
        document.removeEventListener("mouseup", mouseUpHandler);
        document.title = iSpeed;
        timer = setInterval(function(){
            if(iSpeed>0){
                iSpeed--;
            }else{
                iSpeed++;
            }
            if(iSpeed==0){
                clearInterval(timer);
            }
            disX += iSpeed;
            move();
        }, 20);
    }
    function move(){
        _disX = parseInt(disX/20);
        if(_disX>0){
            _disX = disX%imgCount;
        }else{
            _disX = disX - Math.floor(disX/imgCount)*imgCount;
        }
        if(lastImgNode != imgNodes[_disX]){
            lastImgNode.style.display = "none";
            imgNodes[_disX].style.display = "block";
            lastImgNode = imgNodes[_disX];
        }
    }
    document.addEventListener("mousedown", mouseDownHandler);
};

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