https://github.com/comehope/front-end-daily-challenges
定义 dom,容器中包含 1 个 .car
元素,它的 2 个子元素分别代表车身和车轮:
<figure class="loader"> <div class="car"> <span class="body"></span> <span class="wheels"></span> </div> </figure>
居中显示:
body { margin: 0; height: 100vh; display: flex; align-items: center; justify-content: center; background-color: #333; }
定义容器尺寸和车的颜色:
.loader { width: 11.7em; height: 4.2em; color: lightcyan; position: relative; }
画出底盘:
.car { position: absolute; width: inherit; height: 2em; background-color: currentColor; top: 1.5em; border-radius: 0 5em 1em 0 / 0 4em 1em 0; }
画出尾冀:
.car::before { content: ''; position: absolute; width: 0; height: 0; border: 0.6em solid transparent; border-left-width: 0; border-right-color: currentColor; transform-origin: left; transform: rotate(-45deg); top: -0.5em; }
(这时看起来有点儿像飞机,哈哈~~)
画出车身:
.body { position: absolute; width: 7.5em; height: 3.5em; box-sizing: border-box; border: 0.4em solid; border-radius: 3em 4.5em 0 0 / 3em 4em 0 0; top: -1.5em; left: 1.2em; }
用伪元素画出车窗:
.body::before { content: ''; position: absolute; width: 3.5em; height: inherit; background-color: currentColor; border-top-left-radius: inherit; left: -0.4em; top: -0.4em; }
画出车轮的轮廓:
.wheels::before, .wheels::after { content: ''; position: absolute; box-sizing: border-box; width: 2.6em; height: 2.6em; background-color: #333; border-radius: 50%; bottom: -1em; }
画出轮毂:
.wheels::before, .wheels::after { border: 0.3em solid #333; background-image: linear-gradient( 135deg, transparent 45%, currentColor 46%, currentColor 54%, transparent 55% ), linear-gradient( 90deg, transparent 45%, currentColor 46%, currentColor 54%, transparent 55% ), linear-gradient( 45deg, transparent 45%, currentColor 46%, currentColor 54%, transparent 55% ), linear-gradient( 0deg, transparent 45%, currentColor 46%, currentColor 54%, transparent 55% ), radial-gradient( currentColor 29%, transparent 30%, transparent 50%, currentColor 51% ); }
把车轮定位到左右两侧:
.wheels::before { left: 1.2em; } .wheels::after { right: 0.8em; }
接下来制作动画效果。
增加表示风影的 dom 元素 .strikes
,它包含 5 个子元素:
<figure class="loader"> <p class="car"> <span class="body"></span> <span class="wheels"></span> </p> <p class="strikes"> <span></span> <span></span> <span></span> <span></span> <span></span> </p> </figure>
画出 5 段短细线:
.strikes { position: absolute; width: 1em; height: inherit; border: 1px dashed white; display: flex; flex-direction: column; justify-content: space-between; } .strikes span { height: 0.1em; background-color: lightcyan; }
增加风影飘逝的动画效果,定义 css 变量,设置动画延时:
.strikes span { animation: drift 0.2s linear infinite; animation-delay: calc((var(--n) - 1) * 0.05s); } @keyframes drift { from { transform: translate(3.5em); } to { transform: translate(-8em); filter: opacity(0); } } .strikes span:nth-child(1) { --n: 1; } .strikes span:nth-child(2) { --n: 2; } .strikes span:nth-child(3) { --n: 3; } .strikes span:nth-child(4) { --n: 4; } .strikes span:nth-child(5) { --n: 5; }
增加轮子转动动画效果:
.wheels::before, .wheels::after { animation: rotating 0.5s linear infinite; } @keyframes rotating { to { transform: rotate(1turn); } }
增加车身颠簸的动画效果:
.car { animation: run 0.25s linear infinite; } @keyframes run { 0% { transform: translate(0.2em, 0.1em) rotate(0deg); } 20% { transform: translate(0.1em, 0.2em) rotate(1deg); } 40% { transform: translate(0.1em, -0.1em) rotate(-1deg); } 60% { transform: translate(-0.1em, 0.2em) rotate(0deg); } 80% { transform: translate(-0.1em, 0.1em) rotate(1deg); } 100% { transform: translate(0.2em, 0.1em) rotate(-1deg); } }
大功告成!
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