这篇文章主要讲解了“css如何实现车轨动画”，文中的讲解内容简单清晰，易于学习与理解，下面请大家跟着小编的思路慢慢深入，一起来研究和学习“css如何实现车轨动画”吧！

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css实现车轨动画的方法：1、创建一个HTML文件，并定义div为“

...

”；2、设置CSS类为mountains和train；3、通过使用CSS3的动画属性及动画帧“@keyframes”实现车轨动画即可。

效果预览

代码实现

HTML代码

HTML代码的结构非常清晰，总体来讲分两部分，一部分是作为背景的明月、高山以及星空，对应的CSS类为mountains；另一部分则是行驶的火车，对应的CSS类为train。

对于火车部分则相对比较复杂，有车头、引擎、轨道、车轮、车厢等元素，下面的CSS代码中会一一讲解。

CSS代码

背景部分绘制了两座高山，一轮明月以及清澈的星空。

.mountains {
 height: 100%;
 position: absolute;
 width: 100%;
 z-index: 1;}.mountains::before, .mountains::after {
 background: #000c18;
 background: -moz-linear-gradient(#012a53, #000c18 50%);
 background: -webkit-linear-gradient(#012a53, #000c18 50%);
 background: -o-linear-gradient(#012a53, #000c18 50%);
 background: -ms-linear-gradient(#012a53, #000c18 50%);
 background: linear-gradient(#012a53, #000c18 50%);
 content: "";
 height: 100%;
 position: absolute;}.mountains::before {
 border-radius: 100% 300% 0 0;
 left: -20%;
 width: 57%;}.mountains::after {
 border-radius: 300% 100% 0 0;
 right: -20%;
 width: 80%;}

然后就是火车轨道的桥梁部分，也十分简单

.bridge {
 border-bottom: 0.3rem solid white;
 border-top: 0.3rem solid white;
 background: black;
 background: -webkit-linear-gradient(55deg, transparent 46%, white 46%, white 54%, transparent 54%) left/1.6rem 2.2rem, -webkit-linear-gradient(-55deg, transparent 46%, white 46%, white 54%, transparent 54%) left/1.6rem 2.2rem;
 background: -moz-linear-gradient(55deg, transparent 46%, white 46%, white 54%, transparent 54%) left/1.6rem 2.2rem, -moz-linear-gradient(-55deg, transparent 46%, white 46%, white 54%, transparent 54%) left/1.6rem 2.2rem;
 background: -o-linear-gradient(55deg, transparent 46%, white 46%, white 54%, transparent 54%) left/1.6rem 2.2rem, -o-linear-gradient(-55deg, transparent 46%, white 46%, white 54%, transparent 54%) left/1.6rem 2.2rem;
 background: -ms-linear-gradient(55deg, transparent 46%, white 46%, white 54%, transparent 54%) left/1.6rem 2.2rem, -ms-linear-gradient(-55deg, transparent 46%, white 46%, white 54%, transparent 54%) left/1.6rem 2.2rem;
 background: linear-gradient(55deg, transparent 46%, white 46%, white 54%, transparent 54%) left/1.6rem 2.2rem, linear-gradient(-55deg, transparent 46%, white 46%, white 54%, transparent 54%) left/1.6rem 2.2rem;
 bottom: 10rem;
 height: 2.6rem;
 position: absolute;
 width: 100%;
 z-index: 1;}

在后面就是本动画的主体部分小火车了，其每一部分都有对应的CSS类来描述，请看代码：

.train {
 animation: move-train 24s linear infinite;
 bottom: 12.6rem;
 height: 10rem;
 position: absolute;
 left: calc(100% + 1.3rem);
 width: 44rem;
 z-index: 1;}.engine-front, .engine-front::before, .engine-front::after {
 background: #0f0f0f;
 background: linear-gradient(0deg, #0f0f0f, #262626, #0f0f0f);
 border: 0.1rem solid rgba(255, 255, 255, 0.15);
 border-radius: 50% 0 0 50%;
 border-right: none;}.engine-front {
 animation: body-upDown 0.3s infinite;
 border-radius: 0.5rem 0 0 0.5rem;
 bottom: 1.4rem;
 height: 4.6rem;
 left: 0;
 position: absolute;
 width: 8rem;}.engine-front::before, .engine-front::after {
 content: "";
 position: absolute;
 height: 70%;
 left: -0.9rem;
 top: 50%;
 transform: translate(0, -50%);
 width: 0.8rem;}.engine-front::after {
 height: 40%;
 left: -1.4rem;
 width: 0.5rem;}.chimney {
 background: #990000;
 height: 2.2rem;
 left: 2.5rem;
 position: absolute;
 top: -2.3rem;
 width: 1.7rem;}.chimney::before, .chimney::after {
 content: "";
 position: absolute;}.chimney::before {
 animation: up-down 0.3s infinite;
 border-bottom: none;
 border-left: 0.5rem solid transparent;
 border-right: 0.5rem solid transparent;
 border-top: 0.8rem solid orange;
 left: 50%;
 top: -0.9rem;
 transform: translate(-50%, 0);
 width: 160%;}.smoke {
 animation: move-smoke 0.4s linear infinite;
 background: rgba(255, 255, 255, 0.8);
 border-radius: 50%;
 height: 1.4rem;
 left: 0.2rem;
 position: absolute;
 top: -1.5rem;
 width: 0.8rem;
 z-index: -1;}.smoke-2 {
 animation-delay: 0.1s;
 left: 0.4rem;}.smoke-3 {
 animation-delay: 0.2s;
 left: 0.6rem;}.smoke-4 {
 left: 0.8rem;}.engine-body {
 animation: body-upDown 0.3s 0.1s infinite;
 background: #b30000;
 background: linear-gradient(0deg, #330000, red, #990000);
 border-radius: 0 0 0.4rem 0;
 bottom: 1.4rem;
 height: 7rem;
 left: 8rem;
 position: absolute;
 width: 5rem;}.engine-body::before, .engine-body::after {
 content: "";
 left: 50%;
 position: absolute;
 transform: translate(-50%, 0);}.engine-body::before {
 animation: up-down 0.3s 0.2s infinite;
 background: #660000;
 background: linear-gradient(0deg, #660000, #990000, #660000);
 border-radius: 50% 50% 0 0;
 height: 1.2rem;
 top: -1.2rem;
 width: 130%;}.engine-body::after {
 background: #b3e0f2;
 border-radius: 0.2rem;
 height: 40%;
 top: 1rem;
 width: 45%;}.wheel::before, .wheel::after {
 left: 50%;
 top: 50%;
 transform: translate(-50%, -50%);}.wheel-holder {
 height: 2.8rem;
 bottom: 0;
 position: absolute;
 width: 100%;}.wheel {
 animation: rotate 2s linear infinite;
 background: orange;
 border: 0.3rem solid rgba(0, 0, 0, 0.6);
 border-radius: 50%;
 height: 2.8rem;
 left: 1rem;
 position: absolute;
 width: 2.8rem;}.wheel-2 {
 left: 4.5rem;}.wheel-3 {
 border-width: 0.5rem;
 height: 3.8rem;
 left: 8.7rem;
 top: -1.1rem;
 width: 3.8rem;}.wheel-4 {
 left: 15.7rem;}.wheel-5 {
 left: 19.5rem;}.wheel-6 {
 left: 25.7rem;}.wheel-7 {
 left: 29.5rem;}.wheel-8 {
 left: 35.7rem;}.wheel-9 {
 left: 39.5rem;}.wheel::before, .wheel::after {
 content: "";
 position: absolute;}.wheel::before {
 background: rgba(0, 0, 0, 0.3);
 height: 86%;
 width: 0.2rem;}.wheel::after {
 background: #996300;
 background: -webkit-radial-gradient(circle at center, #b37400 30%, #996300 30%);
 background: -moz-radial-gradient(circle at center, #b37400 30%, #996300 30%);
 background: -o-radial-gradient(circle at center, #b37400 30%, #996300 30%);
 background: -ms-radial-gradient(circle at center, #b37400 30%, #996300 30%);
 background: radial-gradient(circle at center, #b37400 30%, #996300 30%);
 border-radius: 50%;
 height: 40%;
 width: 40%;}.compartment {
 animation: body-upDown 0.3s infinite;
 background: #186c8e;
 background: -webkit-linear-gradient(#104b63 50%, #1f8dba);
 background: -moz-linear-gradient(#104b63 50%, #1f8dba);
 background: -o-linear-gradient(#104b63 50%, #1f8dba);
 background: -ms-linear-gradient(#104b63 50%, #1f8dba);
 background: linear-gradient(#104b63 50%, #1f8dba);
 border-radius: 0 0 0.3rem 0.3rem;
 bottom: 1.4rem;
 height: 5rem;
 left: 15rem;
 position: absolute;
 width: 8rem;}.compartment-two {
 animation: body-upDown 0.3s 0.1s infinite;
 left: 25rem;}.compartment-two .compartment-window::before {
 animation: up-down 0.3s 0.3s infinite;}.compartment-three {
 animation: body-upDown 0.3s 0.2s infinite;
 left: 35rem;}.compartment-three .compartment-window::before {
 animation: up-down 0.35s infinite;}.compartment::before, .compartment::after {
 background: black;
 border: 0.4rem solid transparent;
 bottom: 0.4rem;
 box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.1);
 content: "";
 height: 0.8rem;
 position: absolute;
 width: 0.9rem;}.compartment::before {
 border-left: 0.4rem solid rgba(255, 255, 255, 0.3);
 left: -0.9rem;}.compartment::after {
 border-right: 0.4rem solid rgba(255, 255, 255, 0.3);
 left: -2rem;}.compartment-window {
 background: #1f8dba;
 background: -moz-linear-gradient(90deg, transparent 0.8rem, skyblue 0.8rem) left/2.4rem 100%;
 background: -webkit-linear-gradient(90deg, transparent 0.8rem, skyblue 0.8rem) left/2.4rem 100%;
 background: -o-linear-gradient(90deg, transparent 0.8rem, skyblue 0.8rem) left/2.4rem 100%;
 background: -ms-linear-gradient(90deg, transparent 0.8rem, skyblue 0.8rem) left/2.4rem 100%;
 background: linear-gradient(90deg, transparent 0.8rem, skyblue 0.8rem) left/2.4rem 100%;
 height: 40%;
 position: absolute;
 top: 0.7rem;
 width: 100%;}.compartment-window::before, .compartment-window::after {
 content: "";
 position: absolute;}.compartment-window::before {
 animation: up-down 0.3s 0.1s infinite;
 background: #104b63;
 border-radius: 50% 50% 0 0;
 height: 0.6rem;
 left: 50%;
 top: -1.4rem;
 transform: translate(-50%, 0);
 width: 110%;}

到这里为止，我们已经用HTML和CSS代码将整个小火车以及周围的环境都绘制出来了。

那么最重要的一步便是让这辆小火车在桥梁上行驶起来，这就要用到CSS3的一些动画属性了，CSS3的动画帧闪亮登场。

@keyframes up-down {
 0%, 100% {
   transform: translate(-50%, 0);
 }
 50% {
   transform: translate(-50%, -0.3rem);
 }}@keyframes rotate {
 100% {
   transform: rotate(-360deg);
 }}@keyframes move-train {
 100% {
   transform: translateX(-154rem);
 }}@keyframes body-upDown {
 0%, 100% {
   transform: translateY(0);
 }
 100% {
   transform: translateY(-0.2rem);
 }}@keyframes move-smoke {
 0% {
   -webkit-filter: blur(0);
   -moz-filter: blur(0);
   -o-filter: blur(0);
   -ms-filter: blur(0);
   filter: blur(0);
   opacity: 1;
 }
 50% {
   -webkit-filter: blur(0.2rem);
   -moz-filter: blur(0.2rem);
   -o-filter: blur(0.2rem);
   -ms-filter: blur(0.2rem);
   filter: blur(0.2rem);
   opacity: 0.6;
   transform: translate(0, -3rem) scale(2);
 }
 100% {
   -webkit-filter: blur(0.3rem);
   -moz-filter: blur(0.3rem);
   -o-filter: blur(0.3rem);
   -ms-filter: blur(0.3rem);
   filter: blur(0.3rem);
   opacity: 0;
   transform: translate(2.5rem, -6rem) scale(3);
 }}@keyframes wheel-joint {
 100% {
   transform: rotate(360deg);
 }}

这些动画中做了几件事情：

• 让车厢盖子上下拍动，让动画小火车行驶的样子更加逼真。

• 利用滤镜，非常生动地描绘出了小火车行驶过程中蒸汽机引擎冒出的蒸汽。

• 让小火车整体在桥梁上周而复始地行驶，车轮也不停的转动。

感谢各位的阅读，以上就是“css如何实现车轨动画”的内容了，经过本文的学习后，相信大家对css如何实现车轨动画这一问题有了更深刻的体会，具体使用情况还需要大家实践验证。这里是创新互联，小编将为大家推送更多相关知识点的文章，欢迎关注！

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