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CSS3 实现3D旋转木马效果
基本原理:
- 1.首先我们需要让图片能旋转的效果,我们让所有图片绝对定位(position:absolute),共用一个中心点。
- 2.对于舞台我们加一个视距,比如下面的demo是 perspective: 800px;
- 3.对于容器 我们可以加一个3D视图 transform-style: preserve-3d;
- 4. 对于图片旋转,我们要使用在旋转 rotateY,但是一圈是360度,而图片共九张,因此每一张的图片旋转的角度是40度;
- 因此我们可以在css下这样写代码:
img:nth-child(1) { transform: rotateY( 0deg ); }
img:nth-child(2) { transform: rotateY( 40deg ); }
img:nth-child(3) { transform: rotateY( 80deg ); }
img:nth-child(4) { transform: rotateY( 120deg ); }
img:nth-child(5) { transform: rotateY( 160deg ); }
img:nth-child(6) { transform: rotateY( 200deg ); }
img:nth-child(7) { transform: rotateY( 240deg ); }
img:nth-child(8) { transform: rotateY( 280deg ); }
img:nth-child(9) { transform: rotateY( 320deg ); }
由于共用一个中心点,所以我们可以看下如下图效果:
在3维空间中,想象一下:如果我们将每一张图片拉开到合适位置,是否就可以组成一个正九边形?
原本全部集中在中心点,拉开到六边形边上,其移动的距离及时图中的r的距离。
如何计算这个距离:
使用Math库中的tan正切函数。因为知道一条边及三个角的角度,所以:
r = 64/Math.tan(20/180 * Math.PI)
实例:
HTML:
1 <div class="d-rotate"> 2 <h3>3d旋转效果--点击任意图片浏览</h3> 3 <div id="stage" class="d_stage_area"> 4 <div id="container" class="container"> 5 <img src="http://images2015.cnblogs.com/blog/561794/201604/561794-20160413010122691-69559955.jpg" width="128" height="96" id="img1"/> 6 <img src="http://images2015.cnblogs.com/blog/561794/201604/561794-20160413010158301-1687814878.jpg" width="128" height="96" id="img2"/> 7 <img src="http://images2015.cnblogs.com/blog/561794/201604/561794-20160413010311832-1730833656.jpg" width="128" height="96" id="img3"/> 8 <img src="http://images2015.cnblogs.com/blog/561794/201604/561794-20160413010330816-951755840.jpg" width="128" height="96" id="img4"/> 9 <img src="http://images2015.cnblogs.com/blog/561794/201604/561794-20160413010350285-1813069804.jpg" width="128" height="96" id="img5"/>10 <img src="http://images2015.cnblogs.com/blog/561794/201604/561794-20160413010410801-943411344.jpg" width="128" height="96" id="img6"/>11 <img src="http://images2015.cnblogs.com/blog/561794/201604/561794-20160413010430395-1452487381.jpg" width="128" height="96" id="img7"/>12 <img src="http://images2015.cnblogs.com/blog/561794/201604/561794-20160413010447332-2127426646.jpg" width="128" height="96" id="img8"/>13 <img src="http://images2015.cnblogs.com/blog/561794/201604/561794-20160413010506613-1828415192.jpg" width="128" height="96" id="img8"/>14 </div>15 </div>16 </div>
CSS:
1 body { 2 margin:100px; 3 background-color:hsla(50,50%,40%,0.8); 4 } 5 .d-rotate { 6 margin:10px; 7 } 8 .d-rotate h3 { 9 text-align: center;10 font-size: 1em;11 }12 .d_stage_area {13 position:relative;14 top: 0;15 width:800px;16 min-height: 100px;17 padding: 100px;18 background:#333;19 -webkit-perspective:800px;20 -moz-perspective: 800px;21 perspective: 800px;22 -webkit-transition: top .5s;23 }24 .d-rotate .container {25 position: absolute;26 left: 50%;27 top:50%;28 width:128px;29 height:100px;30 -webkit-transition: -webkit-transform 1s;31 -moz-transition: -moz-transform 1s;32 transition: transform 1s;33 34 -webkit-transform-style: preserve-3d;35 -moz-transform-style: preserve-3d;36 transform-style: preserve-3d;37 }38 .d-rotate .container img {39 position: absolute;40 bottom: 0;41 width:128px;42 box-shadow: 0 1px 3px rgba(0,0,0,.5);43 -webkit-transition: opacity 1s, -webkit-transform 1s;44 -moz-transition: opacity 1s, -moz-transform 1s;45 transition: opacity 1s, transform 1s;46 }47 .d-rotate img:nth-child(1) { transform: rotateY( 0deg ); }48 .d-rotate img:nth-child(2) { transform: rotateY( 40deg ); }49 .d-rotate img:nth-child(3) { transform: rotateY( 80deg ); }50 .d-rotate img:nth-child(4) { transform: rotateY( 120deg ); }51 .d-rotate img:nth-child(5) { transform: rotateY( 160deg ); }52 .d-rotate img:nth-child(6) { transform: rotateY( 200deg ); }53 .d-rotate img:nth-child(7) { transform: rotateY( 240deg ); }54 .d-rotate img:nth-child(8) { transform: rotateY( 280deg ); }55 .d-rotate img:nth-child(9) { transform: rotateY( 320deg ); }
JS:
1 (function(){ 2 // css transform 变换 3 var transform = function(element, value, key) { 4 key = key || "Transform"; 5 ["Moz", "O", "Ms", "Webkit", ""].forEach(function(prefix) { 6 element.style[prefix + key] = value; 7 }); 8 return element; 9 };10 var $ = function(selector) {11 return document.querySelector(selector);12 };13 // 获取元素14 var eleStage = $("#stage"),15 container = $("#container");16 17 var indexPiece = 0,18 htmlPic = ‘‘,19 arrayPic = [1, 2, 3, 4, 5, 6, 7, 8, 9],20 rotate = 360 / arrayPic.length;21 22 arrayPic.forEach(function(i) {23 htmlPic = htmlPic + ‘<img id="img‘+ i +‘" src="http://www.mamicode.com/‘+ i +‘.jpg"/>‘;24 });25 container.innerHTML = htmlPic;26 27 28 var transZ = 64 / Math.tan((rotate / 2 / 180) * Math.PI);29 30 // 添加事件监听器31 container.addEventListener("click", function() {32 transform(this, "rotateY("+ (-1 * rotate * ++indexPiece) +"deg)");33 });34 35 arrayPic.forEach(function(i, j) {36 transform($("#img" + i), "rotateY("+ j * rotate +"deg) translateZ("+ (transZ+15) +"px)");37 });38 39 })();
效果图: