前端每日实战:64# 视频演示如何用纯 CSS 绘制一个足球场(来吧!参与到 2018 世界杯大潮中!)

@comehope

原文链接

图片描述

效果预览

按下右侧的“点击预览”按钮可以在当前页面预览,点击链接可以全屏预览。

https://codepen.io/comehope/pen/BVqXwJ点击预览

可交互视频

此视频是可以交互的,你可以随时暂停视频,编辑视频中的代码。

请用 chrome, safari, edge 打开观看。

https://scrimba.com/p/pEgDAM/cKbw4Tg

源代码下载

每日前端实战系列的全部源代码请从 github 下载:

https://github.com/comehope/front-end-daily-challenges

代码解读

定义 dom,容器中包含场地,场地中再包含中线、中点、中圈、禁区、罚球点、罚球弧、球门区、角球区等元素:

<div class="container">
    <div class="field">
        <span class="halfway-line"></span>
        <span class="centre-circle"></span>
        <span class="centre-mark"></span>
        <span class="penalty-area"></span>
        <span class="penalty-mark"></span>
        <span class="penalty-arc"></span>
        <span class="goal-area"></span>
        <span class="corner-arc"></span>
    </div>
</div>

居中显示:

body {
    margin: 0;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: radial-gradient(sandybrown, maroon);
}

定义容器尺寸:

.container {
    width: 120em;
    height: 80em;
    background-color: green;
    font-size: 5px;
}

.container span {
    display: block;
}

定义线型:

.container {
    --line: 0.3em solid white;
}

画出场地边线:

.container {
    padding: 5em;
}

.field {
    width: inherit;
    height: inherit;
    border: var(--line);
}

画出中线:

.halfway-line {
    width: calc(120em / 2);
    height: 80em;
    border-right: var(--line);
}

画出中圈:

.field {
    position: relative;
}

.centre-circle {
    width: 20em;
    height: 20em;
    border: var(--line);
    border-radius: 50%;
    position: absolute;
    top: calc((80em - 20em) / 2);
    left: calc((120em - 20em - 0.3em) / 2);
}

画出中点:

.centre-mark {
    width: 2em;
    height: 2em;
    background-color: white;
    border-radius: 50%;
    position: absolute;
    top: calc(80em / 2 - 1em);
    left: calc(120em / 2 - 1em + 0.3em / 2);
}

画出禁区:

.penalty-area {
    width: 18em;
    height: 44em;
    border: var(--line);
    position: absolute;
    top: calc((80em - 44em) / 2);
    left: -0.3em;
}

画出罚球点:

.penalty-mark {
    width: 2em;
    height: 2em;
    background-color: white;
    border-radius: 50%;
    position: absolute;
    top: calc(80em / 2 - 1em);
    left: calc(12em - 1em);
}

画出罚球弧:

.penalty-arc {
    width: 20em;
    height: 20em;
    border: var(--line);
    border-radius: 50%;
    position: absolute;
    top: calc((80em - 20em) / 2);
    left: calc(12em - 20em / 2);
}

隐藏罚球弧左侧弧线,只留右侧弧线:

.field {
    z-index: 1;
}

.penalty-area {
    background-color: green;
}

.penalty-arc {
    z-index: -1;
}

画出球门区:

.goal-area {
    width: 6em;
    height: 20em;
    border: var(--line);
    position: absolute;
    top: calc((80em - 20em) / 2);
    left: -0.3em;
}

画出角球区:

.field {
    overflow: hidden;
}

.corner-arc::before,
.corner-arc::after {
    content: '';
    position: absolute;
    width: 5em;
    height: 5em;
    border: 0.3em solid white;
    border-radius: 50%;
    --offset: calc(-5em / 2 - 0.3em);
    left: var(--offset);
}

.corner-arc::before {
    top: var(--offset);
}

.corner-arc::after {
    bottom: var(--offset);
}

把 dom 中的子元素复制出一份,左右两侧各一份:

<div class="container">
    <div class="field">
        <div class="left">
            <span class="halfway-line"></span>
            <span class="centre-circle"></span>
            <span class="centre-mark"></span>
            <span class="penalty-area"></span>
            <span class="penalty-mark"></span>
            <span class="penalty-arc"></span>
            <span class="goal-area"></span>
            <span class="corner-arc"></span>
        </div>
        <div class="right">
            <span class="halfway-line"></span>
            <span class="centre-circle"></span>
            <span class="centre-mark"></span>
            <span class="penalty-area"></span>
            <span class="penalty-mark"></span>
            <span class="penalty-arc"></span>
            <span class="goal-area"></span>
            <span class="corner-arc"></span>
        </div>
    </div>
</div>

右侧的样式与左侧相同,只需要水平翻转即可:

.right {
    position: absolute;
    top: 0;
    left: 50%;
    transform: rotateY(180deg);
}

大功告成!


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