js实现旋转图片轮播

2018-08-18

话不多说，直接上代码

html:

<div id="perspective">
<div id='wrap'>
<img src="images/tingjie.jpg" />
<img src="images/tingjie.jpg" />
<img src="images/tingjie.jpg" />
<img src="images/tingjie.jpg" />
<img src="images/tingjie.jpg" />
<img src="images/tingjie.jpg" />
<img src="images/tingjie.jpg" />
<img src="images/tingjie.jpg" />
<img src="images/tingjie.jpg" />
<img src="images/tingjie.jpg" />
<img src="images/tingjie.jpg" />
<p></p>
</div>
</div>

css:

<style type="text/css">
* {
margin: 0;
padding: 0;
}

body {
background: #000;
overflow: hidden;
}

#perspective {
perspective: 800px;
}

#wrap {
width: 120px;
/*133:200 4:6 */
height: 180px;
margin: 0 auto;
position: relative;
/*搭建3D效果必须的两个属性：一个变换风格变3d，一个场景景深800px*/
transform-style: preserve-3d;
transform: rotateX(-10deg) rotateY(0deg);
}

#wrap img {
width: 100%;
height: 100%;
position: absolute;
border-radius: 5px;
/*加上圆角*/
box-shadow: 0px 0px 10px #fff;
/*box-shadow 属性向框添加一个或多个阴影*/
-webkit-box-reflect: below 10px -webkit-linear-gradient(top, rgba(0, 0, 0, 0) 50%, rgba(0, 0, 0, 0.5) 100%);
}

#wrap p {
width: 1200px;
height: 1200px;
background: -webkit-radial-gradient(center center, 600px 600px, rgba(244, 23, 234, 0.2), rgba(0, 0, 0, 0));
border-radius: 100%;
position: absolute;
left: 50%;
top: 102%;
margin-left: -600px;
margin-top: -600px;
transform: rotateX(90deg);
}
</style>

js:

<script type="text/javascript">
window.onload = function() {
var oWrap = document.getElementById('wrap');
var oImg = oWrap.getElementsByTagName('img');
var oImgLength = oImg.length;
var Deg = 360 / oImgLength;
var nowX, nowY, lastX, lastY, minusX = 0,
minusY = 0;
var roY = 0,
roX = -10;
var timer;

for(var i = 0; i < oImgLength; i++) {
oImg[i].style.transform = 'rotateY(' + i * Deg + 'deg) translateZ(350px)';
oImg[i].style.transition = 'transform 1s ' + (oImgLength - 1 - i) * 0.1 + 's';

}

mTop();

window.onresize = mTop;

function mTop() {
var wH = document.documentElement.clientHeight;
oWrap.style.marginTop = wH / 2 - 180 + 'px';
}

// 拖拽：三个事件-按下 移动 抬起
//按下
document.onmousedown = function(ev) {
ev = ev || window.event;

//鼠标按下的时候，给前一点坐标赋值，为了避免第一次相减的时候出错
lastX = ev.clientX;
lastY = ev.clientY;

//移动
this.onmousemove = function(ev) {
ev = ev || window.event;

clearInterval(timer);

nowX = ev.clientX; // clientX 鼠标距离页面左边的距离
nowY = ev.clientY; // clientY ………………………………顶部………………

//当前坐标和前一点坐标差值
minusX = nowX - lastX;
minusY = nowY - lastY;

//更新wrap的旋转角度，拖拽越快-> minus变化大 -> roY变化大 -> 旋转快
roY += minusX * 0.2; // roY = roY + minusX*0.2;
roX -= minusY * 0.1;

oWrap.style.transform = 'rotateX(' + roX + 'deg) rotateY(' + roY + 'deg)';

/*
//生成div，让div跟着鼠标动
var oDiv = document.createElement('div');
oDiv.style.cssText = 'width:5px;height:5px;background:red;position:fixed;left:'+nowX+'px;top:'+nowY+'px';
this.body.appendChild(oDiv);
*/

//前一点的坐标
lastX = nowX;
lastY = nowY;

}
//抬起
this.onmouseup = function() {
this.onmousemove = null;
timer = setInterval(function() {
minusX *= 0.95;
minusY *= 0.95;
roY += minusX * 0.2; // roY = roY + minusX*0.2;
roX -= minusY * 0.1;
oWrap.style.transform = 'rotateX(' + roX + 'deg) rotateY(' + roY + 'deg)';

if(Math.abs(minusX) < 0.1 && Math.abs(minusY) < 0.1) {
clearInterval(timer);
}
console.log(minusX);
}, 13);
}
return false;
}
}
</script>