本文通过原生js，点击事件，鼠标按下、鼠标抬起和鼠标移动事件，实现3d立方体的拖动旋转，并将旋转角度实时的反应至界面上显示。
实现原理：通过获取鼠标点击屏幕时的坐标和鼠标移动时的坐标，来获得鼠标在X轴、Y轴移动的距离，将距离实时赋值给transform属性。
从而通过改变transform：rotate属性值来达到3D立方体旋转的效果：
HTML代码块：
<body>
<input type="button" class="open" value="点击散开"/>
<input type="text" class="xNum" value="0"/>//X轴旋转角度
<input type="text" class="yNum" value="0"/>//Y轴旋转角度
<input type="text" class="zNum"/>
<p class="big_box">
<p class="box">
<span>1</span>
<span>2</span>
<span>3</span>
<span>4</span>
<span>5</span>
<span>6</span>
</p>
</p>
</body>
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CSS代码块：
<style>
body{cursor: url("img/openhand1.png"),auto;}
.big_box{
width: 500px;
height: 500px;
margin: 200px auto;
}
.box{
-webkit-transform-style: preserve-3d;
-moz-transform-style: preserve-3d;
-ms-transform-style: preserve-3d;
transform-style: preserve-3d;
transform-origin:100px 100px 00px;
position: relative;
transform: rotatex(0deg) rotatey(0deg) rotatez(0deg)scale3d(0.7,0.7,0.7);
}
.box span{
transition: all 1s linear;
}
span{
display: block;
position: absolute;
width: 200px;
height: 200px;
box-sizing: border-box;
border:1px solid #999;
/*opacity: 0.7;*/
text-align: center;
line-height: 200px;
font-size: 60px;
font-weight: 700;
border-radius: 12%;
}
.box span:nth-child(1){
background-color: deepskyblue;
transform-origin: left;
transform: rotatey(-90deg) translatex(-100px);//左
}
.box span:nth-child(2){
background-color: red;
transform-origin: rightright;
transform: rotatey(90deg) translatex(100px) ;//右
}
.box span:nth-child(3){
background-color: green;
transform-origin: top;
transform: rotatex(90deg) translatey(-100px) ;//上
}
.box span:nth-child(4){
background-color: #6633FF;
transform-origin: bottombottom;
transform: rotatex(-90deg) translatey(100px);//下
}
.box span:nth-child(5){
background-color: gold;
transform: translatez(-100px);//后
}
.box span:nth-child(6){
background-color: #122b40;
transform: translatez(100px);//前
}
.box:hover span{
opacity: 0.3;
}
.box:hover{
animation-play-state:paused;//设置动画暂停
}
</style>
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JS代码块：
<script>
move();
clickBox();
//鼠标按下且移动时触发，
function move(){
var body = document.querySelector("body");
var box = document.querySelector(".box");
var xNum =document.querySelector(".xNum");
var yNum =document.querySelector(".yNum");
var x = 0,y = 0,z = 0;
var xx = 0,yy = 0;
var xArr = [],yArr = [];
window.onmousedown = function (e) {//鼠标按下事件
body.style.cursor = 'url("img/closedhand1.png"),auto';
xArr[0] = e.clientX/2;//获取鼠标点击屏幕时的坐标
yArr[0] = e.clientY/2;
window.onmousemove = function (e) {//鼠标移动事件————当鼠标按下且移动时触发
xArr[1] = e.clientX/2;//获取鼠标移动时第一个点的坐标
yArr[1] = e.clientY/2;
yy += xArr[1] - xArr[0];//获得鼠标移动的距离
xx += yArr[1] - yArr[0];
xNum.value = xx+"°";//将所获得距离数字赋值给input显示旋转角度
yNum.value = yy+"°";
//将旋转角度写入transform中
box.style.transform = "rotatex("+xx+"deg) rotatey("+yy+"deg) rotatez(0deg)scale3d(0.7,0.7,0.7)";
xArr[0] = e.clientX/2;
yArr[0] = e.clientY/2;
}
};
window.onmouseup = function () {//鼠标抬起事件————用于清除鼠标移动事件，
body.style.cursor = 'url("img/openhand1.png"),auto';
window.onmousemove = null;
}
}
//点击事件、负责立方体盒子的六面伸展
function clickBox(){
var btn = document.querySelector(".open");
var box = document.querySelector(".box");
var son = box.children;
var value = 0;
//存储立方体散开时的transform参数
var arr0 = ["rotatey(-90deg) translatex(-100px)","rotatey(90deg) translatex(100px)","rotatex(90deg) translatey(-100px)",<br>"rotatex(-90deg) translatey(100px)","translatez(-100px)","translatez(100px)"];
//存储立方体合并时的transform参数
var arr1 = ["rotatey(-90deg) translatex(-100px)translatez(100px)","rotatey(90deg) translatex(100px)translatez(100px)",<br>"rotatex(90deg) translatey(-100px)translatez(100px)","rotatex(-90deg) translatey(100px)translatez(100px)","translatez(-200px)","translatez(200px)"];
btn.onclick = function(){
if(value == 0){
value = 1;
btn.value = "点击合并";
for(var i=0;i<arr1.length;i++){
son[i].style.transform = arr1[i];
console.log(son[i])
}
}else if(value == 1){
value = 0;
btn.value = "点击散开";
for(var j=0;j<arr0.length;j++){
son[j].style.transform = arr0[j];
console.log(j);
}
}
};
}
</script>
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