css3 3d小demo

css3 3d案例总结

最近入坑 Web 动画，所以把自己的学习过程记录一下分享给大家。就把最近做的比较好的给大家分享下

1.旋转拼图

首先看下效果

代码主要由HTML和CSS3组成，应该说还是比较简单的。

首先是HTML代码：

  <div class="camera" id="camera">
    <div class="kuai">
      <div class="mian"></div>
      <div class="mian"></div>
      <div class="mian"></div>
      <div class="mian"></div>
      <div class="mian"></div>
      <div class="mian"></div>
    </div>

    <div class="kuai">
      <div class="mian"></div>
      <div class="mian"></div>
      <div class="mian"></div>
      <div class="mian"></div>
      <div class="mian"></div>
      <div class="mian"></div>
    </div>

    <div class="kuai">
      <div class="mian"></div>
      <div class="mian"></div>
      <div class="mian"></div>
      <div class="mian"></div>
      <div class="mian"></div>
      <div class="mian"></div>
    </div>

    <div class="kuai">
      <div class="mian"></div>
      <div class="mian"></div>
      <div class="mian"></div>
      <div class="mian"></div>
      <div class="mian"></div>
      <div class="mian"></div>
    </div>

    <div class="kuai">
      <div class="mian"></div>
      <div class="mian"></div>
      <div class="mian"></div>
      <div class="mian"></div>
      <div class="mian"></div>
      <div class="mian"></div>
    </div>
  </div>

这里用了3层div的HTML框架，层次非常清晰。
接下来重点是CSS代码，如何用CSS3的特性来实现3d和滚动效果，从来让其看起来呈3D的状态。

body{
  background: red;
}
/*对于相机元素*/
.camera{
  perspective: 800px;/*这个属性是视距(景深)，就是目测的距离*/
  width: 500px;
  height: 300px;
  margin: auto;
  transform-style: preserve-3d;/*该属性规定如何在 3D 空间中呈现被嵌套的元素。preserve-3d子元素将保留其 3D 位置。*/
}
/*对于模块元素*/
.kuai{
  width: 100px;
  height: 300px;
  margin: 50px auto;
  float: left;
  transform-style: preserve-3d;
  position: relative;
  transition:transform 1s;
  margin-left: -1px;
}
/*对于模块的每个面元素*/
.kuai:nth-of-type(2)>.mian{
  background-position: -100px 0;
}
.kuai:nth-of-type(3)>.mian{
  background-position: -200px 0;
}
.kuai:nth-of-type(4)>.mian{
  background-position: -300px 0;
}
.kuai:nth-of-type(5)>.mian{
  background-position: -400px 0;
}
.kuai:nth-of-type(6)>.mian{
  background-position: -500px 0;
}
.mian{
  width: 100px;
  height: 300px;
  position: absolute;
  font-size:100px;
  text-align: center;
  line-height: 300px;
  transform-style: preserve-3d;
  background-color: black;
  backface-visibility: hidden;
}
.mian:nth-of-type(1){
  transform: translateZ(150px);
  background:url(../images/pic1.jpg) no-repeat;
  background-size: 500px 100%;
}
.mian:nth-of-type(2){
  transform: translateZ(-150px) rotateX(180deg);
  background:url(../images/pic2.png) no-repeat;
  background-size: 500px 100%;
}
.mian:nth-of-type(3){
  width: 300px;
  transform: rotateY(-90deg) translateZ(150px);/*3d中transform属性是关键的，它主要是靠旋转 移动 缩放来变形实现的*/
}
.mian:nth-of-type(4){
  width: 300px;
  transform: rotateY(90deg) translateZ(-50px);
}
.mian:nth-of-type(5){
  transform: rotateX(90deg) translateZ(150px);
  background:url(../images/pic3.jpg) no-repeat;
  background-size: 500px 100%;
}
.mian:nth-of-type(6){
  transform: rotateX(-90deg) translateZ(150px);
  background:url(../images/pic4.jpg) no-repeat;
  background-size: 500px 100%;
}

最后就是js

window.onload=function() {
  var camera=document.getElementById('camera');
  var kuais=camera.getElementsByClassName('kuai');
  var chishu=0;
  var geshu=5;
  camera.onclick=function() {
    chishu++;
    for(var i=0;i<geshu;i++){
      kuais[i].style="transition:transform 1s "+100*i+"ms;transform:rotateX("+chishu*90+"deg)";
    }
  }
}

这里有个属性没用到 transform-origin,它是用来改变元素的原点位置,可以不设置。如图

同理，还可以设置为：transform-origin:top right（右上角为原点）、transform-origin:bottom right（右下角为原点）、transform-origin:bottom left（左下角为原点）

总结

总而言之，在我学习CSS3的过程中，见到了不少的新特性，也学会了如何使用，但是我想说的是我们不管要学会怎么使用，更要去理解每一行代码为什么产生对应的效果，特别是对于3D transform，我们要从根本去理解了3D空间，才能更好的去掌握它的每一个属性值能够带来的效果。

                                                                         --宏岩翼佬

*一篇原创文章，版权所有，转载请注明出处http://www.cnblogs.com/wanghongze/p/6385171.html

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