有点炫JavaScript原生3D旋转特效

3D图片旋转特效.gif

(写在文前的只言片语、意书情殇)长歌破晓穿云过,响彻碧霄振九天.)------Jason Zhang

web开发已现世多年,技术成熟且学习平台广泛,笔者针对其中细节从本质上进行解释.力求透彻.

html部分

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css部分

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    body {
            background: black;
            color: white;
            line-height: 29px;
        }
        
        span {
            border: 1px solid gray;
            background: #333;
            padding: 4px;
            font-weight: bold;
        }

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JavaScript部分

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window.onload = function() {
            var rt = new imgRound("imgContainer", 120, 90, 300, 80, 230, 0.01);
            setInterval(function() {
                rt.roundMove()
            }, 20)
        }

        function imgRound(id, w, h, x, y, r, dv, rh, ah) {
            if(ah == undefined) ah = 1;
            if(rh == undefined) rh = 10;
            var dv = dv * ah; //旋转速度
            var pi = 3.1415926575;
            var d = pi / 2;
            var pd = Math.asin(w / 2 / r);
            var smove = true;
            var imgArr = new Array();
            var objectId = id;
            var o = document.getElementById(objectId);
            o.style.position = "relative";
            var arrimg = o.getElementsByTagName("img");
            var pn = arrimg.length; //图片数量
            var ed = pi * 2 / pn;
            for(n = 0; n < arrimg.length; n++) {
                var lk = arrimg[n].getAttribute("link");
                if(lk != null) arrimg[n].setAttribute("title", lk)
                arrimg[n].onclick = function() {
                    if(this.getAttribute("link") != null) {
                        if(this.getAttribute("target") != "_blank") window.location = (this.getAttribute("link"))
                        else window.open(this.getAttribute("link"))
                    }
                }
                arrimg[n].onmouseout = function() {
                    smove = true;
                }
                arrimg[n].onmouseover = function() {
                    smove = false;
                }
                arrimg[n].style.position = "absolute";
                imgArr.push(arrimg[n]);
            }
            this.roundMove = function() {
                for(n = 0; n <= pn - 1; n++) {
                    var o = imgArr[n];
                    var ta = Math.sin(d + ed * n),
                        strFilter;
                    if(ta < 0) o.style.left = Math.cos(d + ed * n - pd) * r + x + "px";
                    else o.style.left = Math.cos(d + ed * n + pd) * r + x + "px";
                    o.style.top = ta * rh + rh + y + "px";
                    var zoom = Math.abs(Math.sin((d + ed * n) / 2 + pi / 4)) * 0.5 + 0.5;
                    o.style.width = Math.abs(Math.cos(d + ed * n + pd) - Math.cos(d + ed * n - pd)) * zoom * r + "px";
                    o.style.height = zoom * h + "px";
                    if(ta < 0) {
                        ta = (ta + 1) * 80 + 20;
                        o.style.zIndex = 0;
                    } else {
                        ta = 100;
                        o.style.zIndex = 1
                    }
                    if(o.style.zIndex <= 0) strFilter = "FlipH(enabled:true)"
                    else strFilter = "FlipH(enabled:false)";
                    strFilter = strFilter + " alpha(opacity=" + ta + ")";
                    o.style.opacity = ta / 100;
                    o.style.filter = strFilter;
                }
                if(smove) d = d + dv;
            }
        }

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