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如何用純 CSS 創作一根閃電連線線

在這裡插入圖片描述

效果預覽

線上演示

按下右側的“點選預覽”按鈕可以在當前頁面預覽,點選連結可以全屏預覽。

https://codepen.io/comehope/pen/RBjdzZ

可互動視訊

此視訊是可以互動的,你可以隨時暫停視訊,編輯視訊中的程式碼。

請用 chrome, safari, edge 開啟觀看。

https://scrimba.com/p/pEgDAM/cgkE6C6

原始碼下載

本地下載

每日前端實戰系列的全部原始碼請從 github 下載:

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

程式碼解讀

定義 dom,容器中包含 2 個元素,分別代表插頭和線纜:

<div class="cable">
    <span class="head"></span>
    <span class="body"></span>
</div>

居中顯示:

body {
    margin: 0;
    height: 100vh;
    display: flex;
    align-items: center;
}

定義容器尺寸:

.cable {
    display: flex;
    align-items: center;
    font-size: 10px;
    margin-left: 5em;
}

畫出插頭的輪廓:

.head {
    width: 8.5em;
    height: 8.5em;
    border-radius: 2em 0 0 2em;
}

畫出插頭上針腳的輪廓:

.head {
    position: relative;
}

.head::before {
    content: '';
    position: absolute;
    width: 3em;
    height: 7.3em;
    top: calc((8.5em - 7.3em) / 2);
    left: 0.7em;
    border-radius: 1em;
    box-sizing: border-box;
}

畫出線纜中手持部位的輪廓:

.body {
    width: 15.5em;
    height: 11em;
    border-radius: 0.5em;
}

畫出線纜中稍粗部位的輪廓:

.body {
    position: relative;
    display: flex;
    align-items: center;
}

.body::before {
    content: '';
    position: absolute;
    width: 13.5em;
    height: 6em;
    left: 15.5em;
}

畫出線纜的延長線部分:

.body::after {
    content: '';
    position: absolute;
    width: 100vh;
    height: 3.9em;
    left: calc(15.5em + 13.5em);
}

隱藏畫面外的部分:

body {
    overflow: hidden;
}

接下來繪製細節。
為延長線塗上漸變色:

.body::after {
    background:
        linear-gradient(
            white,
            hsl(0, 0%, 96%) 5%,  
            hsl(0, 0%, 97%) 25%, 
            hsl(0, 0%, 95%) 40%, 
            hsl(0, 0%, 81%) 95%,
            white
        );
}

為線纜中稍粗部位塗上漸變色:

.body::before {
    background:
        linear-gradient(
            white,
            hsl(0, 0%, 96%) 5%,  
            hsl(0, 0%, 98%) 20%, 
            hsl(0, 0%, 95%) 50%, 
            hsl(0, 0%, 81%) 95%,
            white
        );
}

為線纜中手持部位塗上漸變色:

.body {
    background:linear-gradient(
        hsl(0, 0%, 91%),
        white 15%, 
        hsl(0, 0%, 93%) 50%, 
        hsl(0, 0%, 87%) 70%,
        hsl(0, 0%, 79%) 90%,
        hsl(0, 0%, 84%), 
        hsl(0, 0%, 86%)
    );
}

為插頭塗上漸變色:

.head {
    background:
        linear-gradient(
            -45deg, 
            hsl(0, 0%, 75%),
            hsl(0, 0%, 79%),
            hsl(0, 0%, 78%),
            hsl(0, 0%, 87%) 80%
        );
}

在插頭上畫出針腳:

.head::before {
    background-color: white;
}

.head::after {
    content: '';
    position: absolute;
    box-sizing: border-box;
    width: 2.2em;
    height: 0.4em;
    color: goldenrod;
    background-color: currentColor;
    border-radius: 0.5em;
    left: 1.1em;
    top: 1.2em;
    box-shadow: 
        0 0.8em 0,
        0 1.6em 0,
        0 2.4em 0,
        0 3.2em 0,
        0 4em 0,
        0 4.8em 0,
        0 5.6em 0;
}

接下來新增陰影,使線纜更立體。
繪製插頭上的陰影:

.head {
    background:
        linear-gradient(
            90deg, 
            transparent 80%,
            rgba(0,0,0,12%)
        ),
        linear-gradient(
            -45deg, 
            hsl(0, 0%, 75%),
            hsl(0, 0%, 79%),
            hsl(0, 0%, 78%),
            hsl(0, 0%, 87%) 80%
        );
}

繪製線纜手持部分的陰影:

.body::before {
    background:
        linear-gradient(
            45deg, 
            rgba(0,0,0,4%) 10%,
            transparent 20%
        ),    
        linear-gradient(
            90deg, 
            rgba(0,0,0,4%), 
            transparent 10%
        ),
        linear-gradient(
            white,
            hsl(0, 0%, 96%) 5%,  
            hsl(0, 0%, 98%) 20%, 
            hsl(0, 0%, 95%) 50%, 
            hsl(0, 0%, 81%) 95%,
            white
        );
}

繪製線纜中稍粗部位的陰影:

.body::after {
    background:
        linear-gradient(
            45deg, 
            rgba(0,0,0,4%),
            transparent 4%
        ),
        linear-gradient(
            90deg, 
            rgba(0,0,0,4%),
            transparent 2%
        ),
        linear-gradient(
            white,
            hsl(0, 0%, 96%) 5%,  
            hsl(0, 0%, 97%) 25%, 
            hsl(0, 0%, 95%) 40%, 
            hsl(0, 0%, 81%) 95%,
            white
        );
}

最後,為畫面增加入場動畫

.cable {
    animation: show 5s linear infinite;
}

@keyframes show {
    0% {
        transform: translateX(100vw);
    }

    20%, 100% {
        transform: translateX(0);
    }
}

大功告成!

原文地址:https://segmentfault.com/a/1190000015809333