3D转换

一、3D位移

语法：

• transform: translateX(100px) ：仅仅在X轴移动
• transform: translateY(100px) ：仅仅在Y轴移动
• transform: translateZ(100px) ：仅仅在Z轴移动
• transform: translate3d(x,y,z) ：分别在坐标轴上的位移
• transform: translateX(100px) translateY(100px) translateZ(100px)

二、透视

三、3D旋转

语法：

• transform: rotateX(45deg)：沿着x轴正方向旋转45度
• transform: rotateY(45deg)：沿着y轴正方向旋转45度
• transform: rotateZ(45deg)：沿着z轴正方向旋转45度
• transform: rotate3d(x,y,z,45deg)：沿着(x,y,z)向量正方向旋转45度

三维坐标系

旋转方向（左手准则）

3D呈现(transform-style)

案例

两面翻转的盒子

    <div class="box">
        <div class="front">有所不为</div>
        <div class="back">而后可以有为</div>
    </div>

body {
    perspective: 500px;
}

.box {
    position: relative;
    width: 200px;
    height: 200px;
    margin: 100px auto;
    transform-style: preserve-3d;
    transition: all .4s;
}

.box:hover {
    transform: rotateY(180deg);
}

.front,
.back {
    position: absolute;
    top: 0;
    left: 0;
    width: 200px;
    height: 200px;
    border-radius: 50%;
    text-align: center;
    line-height: 200px;
    color: #fff;
}

.front {
    z-index: 1;
    background-color: pink;
}

.back {
    background-color: purple;
    transform: rotateY(180deg);
}

3D导航栏

    <ul>
        <li>
            <div class="box">
                <div class="front">有所不为</div>
                <div class="back">而后可以有为</div>
            </div>
        </li>
        <li>
            <div class="box">
                <div class="front">天下无难事</div>
                <div class="back">只怕有心人</div>
            </div>
        </li>
        <li>
            <div class="box">
                <div class="front">知之为知之</div>
                <div class="back">不知为不知</div>
            </div>
        </li>
        <li>
            <div class="box">
                <div class="front">牡丹虽好</div>
                <div class="back">也得绿叶扶持</div>
            </div>
        </li>
        <li>
            <div class="box">
                <div class="front">牡丹花好</div>
                <div class="back">终须绿叶扶持</div>
            </div>
        </li>
    </ul>

ul li {
    float: left;
    width: 100px;
    height: 50px;
    margin: 0 10px;
    line-height: 50px;
    text-align: center;
    list-style: none;
    perspective: 500px;

}

.box {
    position: relative;
    width: 100px;
    height: 50px;
    transform-style: preserve-3d;
    transition: all .4s;
}

.box:hover {
    transform: rotateX(90deg);
}

.front,
.back {
    position: absolute;
    top: 0;
    left: 0;
    width: 100px;
    height: 50px;
}

.front {
    background-color: pink;
    transform: translateZ(25px);
}

.back {
    background-color: purple;
    transform: rotateX(-90deg) translateZ(25px);
}

旋转木马

    <section>
        <div></div>
        <div></div>
        <div></div>
        <div></div>
        <div></div>
        <div></div>
    </section>

body {
    perspective: 1000px;
}

section {
    position: relative;
    width: 300px;
    height: 200px;
    margin: 100px auto;
    transform-style: preserve-3d;
    transition: all 6s linear;
    background: url(../素材/18-动画素材/pig.jpg);
}

section:hover {
    transform: rotateY(360deg);
}

div {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url(../素材/18-动画素材/dog.jpg) no-repeat;
}

div:nth-child(1) {
    transform: translateZ(300px);
}

div:nth-child(2) {
    transform: rotateY(60deg) translateZ(300px);
}

div:nth-child(3) {
    transform: rotateY(120deg) translateZ(300px);
}

div:nth-child(4) {
    transform: rotateY(180deg) translateZ(300px);
}

div:nth-child(5) {
    transform: rotateY(240deg) translateZ(300px);
}

div:nth-child(6) {
    transform: rotateY(300deg) translateZ(300px);
}