CSS 之使用徑向漸變實現卡券效果

時間  2020-07-07
標籤 css 使用 徑向 漸變 實現 效果 欄目 CSS 简体版
原文   原文鏈接

前言

前幾天，同事接到一個積分商城項目，其中有一個卡券兌換禮品功能。我想了一會沒什麼好的思路，就忙本身的項目去了。但想到之後本身可能也會遇到相似的需求，因此週末學習整理了下幾種卡券效果的實現。css

常見的卡券樣式以下： html

image.png

使用僞元素實現（Less 版本）

image.png
ticket.less 

.ordinary-mixins-ticket-horizontal(@width,@height,@r,@top, @color) {
  position: relative;
  box-sizing: border-box;
  padding: 0 @r;
  width: @width;
  height: @height;
  background-clip: content-box;
  background-color: @color;

  &::before {
    position: absolute;
    top: 0;
    left: 0;
    content: "";
    display: block;
    width: @r + 1px;
    height: 100%;
    background: radial-gradient(@r circle at left @top, transparent @r, @color @r + 1px);
  }

  &::after {
    position: absolute;
    top: 0;
    right: 0;
    content: "";
    display: block;
    //這裏的 @r + 1px 是爲了不某些百分百比縮放頁面時，出現空隙
    width: @r + 1px;
    height: 100%;
    //這裏的 @r + 1px 是爲了防止出現鋸齒
    background: radial-gradient(@r circle at right @top, transparent @r, @color @r + 1px);
  }
}

.parent {
  .ordinary-mixins-ticket-horizontal(200px, 200px, 10px, 150px, #fc3a28);
}
.child {
  line-height: 200px;
}
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App.jsreact

import React from 'react';
import './App.css';
import './ticket.less';

function App() {
    return (
        <div className="App" style={ { display: "flex", justifyContent: "center", alignItems: "center", height: 600 } }> <div className={'parent'}> <div className="child">666</div> </div> </div>
    );
}

export default App;
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升級版樣式一（Less 版本）

image.png 

.mixins-ticket-vertical(@width, @height, @r, @left, @l-color, @r-color) {
  width: @width;
  height: @height;
  // @left - 1px 是爲了不某些百分百比縮放頁面時，出現空隙
  // @r + 1px 是爲了防止出現鋸齒
  // 51% 是爲了防止出現元素中間會有一小段空白區域的狀況
  background: radial-gradient(circle at left top, transparent @r, @l-color  @r + 1px) @left - 1px top ~'/' 100% 51% no-repeat,
  radial-gradient(circle at left bottom, transparent @r, @l-color  @r + 1px) @left - 1px bottom ~'/' 100% 51% no-repeat,
    radial-gradient(circle at  right top, transparent @r, @r-color  @r + 1px ) -(@width - @left) top ~'/' 100% 51% no-repeat,
    radial-gradient(circle at right bottom , transparent @r, @r-color  @r + 1px )  -(@width - @left) bottom ~'/' 100% 51% no-repeat;

  filter: drop-shadow(2px 2px 2px rgba(0, 0, 0, .2));
}

.mixins-ticket-vertical-two(@width, @height, @r, @left, @l-color, @r-color) {
  width: @width;
  height: @height;
  // @left + 1px 是爲了不某些百分百比縮放頁面時，出現空隙
  // @r + 1px 是爲了防止出現鋸齒
  // 51% 是爲了防止出現元素中間會有一小段空白區域的狀況
  background: radial-gradient(circle at left top, transparent @r, @r-color @r + 1px) right top ~'/' (@width - @left) 51% no-repeat,
  radial-gradient(circle at left bottom, transparent @r, @l-color @r + 1px) right bottom ~'/' (@width - @left)   51% no-repeat,
  radial-gradient(circle at right top, transparent @r, @r-color @r + 1px) left top ~'/' @left + 1px 51% no-repeat,
  radial-gradient(circle at right bottom, transparent @r, @l-color @r + 1px) left bottom ~'/' @left + 1px   51% no-repeat;

  filter: drop-shadow(2px 2px 2px rgba(0, 0, 0, .2));
}

.parent {
  .mixins-ticket-vertical(200px, 200px, 10px, 150px, #fc3a28,#fc3a28);
  //.mixins-ticket-vertical-two(200px, 200px, 10px, 150px, #fc3a28,#fc3a28);
}
.child {
  line-height: 200px;
}
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升級版樣式一（Scss 版本）

@mixin mixins-ticket-vertical($width, $height, $r, $left, $l-color, $r-color) {
  width: $width;
  height: $height;
  // $left - 1px 是爲了不某些百分百比縮放頁面時，出現空隙
  // $r + 1px 是爲了防止出現鋸齒
  // 51% 是爲了防止出現元素中間會有一小段空白區域的狀況
  background: radial-gradient(circle at left top, transparent $r, $l-color  $r + 1px) $left - 1px top / 100% 51% no-repeat,
  radial-gradient(circle at left bottom, transparent $r, $l-color  $r + 1px) $left - 1px bottom / 100% 51% no-repeat,
  radial-gradient(circle at  right top, transparent $r, $r-color  $r + 1px ) -($width - $left) top / 100% 51% no-repeat,
  radial-gradient(circle at right bottom , transparent $r, $r-color  $r + 1px )  -($width - $left) bottom / 100% 51% no-repeat;

  filter: drop-shadow(2px 2px 2px rgba(0, 0, 0, .2));
}

.parent {
  @include mixins-ticket-vertical(200px, 200px, 10px, 150px, #fc3a28, #fc3a28);
}

.child {
  line-height: 200px;
}
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升級版樣式二（Less 版本）

image.png 

.mixins-ticket-horizontal(@width, @height, @r, @top, @l-color, @r-color) {
  width: @width;
  height: @height;
  background: radial-gradient(circle at left top, transparent @r, @l-color @r + 1px) left  @top - 1px ~'/' 51% 100% no-repeat,
  radial-gradient(circle at left bottom, transparent @r, @l-color @r + 1px) left -(@height - @top) ~'/' 51% 100% no-repeat,
  radial-gradient(circle at right top, transparent @r, @r-color @r + 1px) right  @top - 1px ~'/' 51% 100% no-repeat,
  radial-gradient(circle at right bottom, transparent @r, @r-color @r + 1px) right -(@height - @top) ~'/' 51% 100% no-repeat;

  filter: drop-shadow(2px 2px 2px rgba(0, 0, 0, .2));
}

.mixins-ticket-horizontal-two(@width, @height, @r, @top, @l-color, @r-color) {
  width: @width;
  height: @height;
  background: radial-gradient(circle at left top, transparent @r, @r-color @r + 1px) left bottom ~'/' 51%  (@height - @top) no-repeat,
  radial-gradient(circle at left bottom, transparent @r, @l-color @r + 1px) left top ~'/' 51%  @top + 1px  no-repeat,
  radial-gradient(circle at right top, transparent @r, @r-color @r + 1px) right bottom ~'/' 51%  (@height - @top) no-repeat,
  radial-gradient(circle at right bottom, transparent @r, @l-color @r + 1px) right top ~'/' 51% @top + 1px no-repeat;

  filter: drop-shadow(2px 2px 2px rgba(0, 0, 0, .2));
}

.parent {
  .mixins-ticket-horizontal(200px, 200px, 10px, 150px, #fc3a28,#fc3a28);
  //.mixins-ticket-horizontal-two(200px, 200px, 10px, 150px, #fc3a28,#fc3a28);
}
.child {
  line-height: 200px;
}
複製代碼

升級版樣式三（Less 版本）

image.png 

.mixins-ticket-horizontal-line(@width, @height, @r, @top, @l-color, @r-color,@border-offset,@border-color) {
  width: @width;
  height: @height;
  background: radial-gradient(circle at left top, transparent @r, @l-color @r + 1px) left @top - 1px ~'/' 51% 100% no-repeat,
  radial-gradient(circle at left bottom, transparent @r, @l-color @r + 1px) left -(@height - @top) ~'/' 51% 100% no-repeat,
  radial-gradient(circle at right top, transparent @r, @r-color @r + 1px) right @top - 1px ~'/' 51% 100% no-repeat,
  radial-gradient(circle at right bottom, transparent @r, @r-color @r + 1px) right -(@height - @top) ~'/' 51% 100% no-repeat;
  filter: drop-shadow(2px 2px 2px rgba(0, 0, 0, .2));

  &::after {
    position: absolute;
    left: 0;
    right: 0;
    top: @top;
    margin: auto;
    content: '';
    width: calc(~"100%" - 2*@r - @border-offset);
    border-top: 1px dashed @border-color;
  }
}

.parent {
  .mixins-ticket-horizontal(200px, 200px, 10px, 150px, #fc3a28,#fc3a28);
  //.mixins-ticket-horizontal-two(200px, 200px, 10px, 150px, #fc3a28,#fc3a28);
}
.child {
  line-height: 200px;
}
複製代碼

升級版樣式四（Less 版本）

image.png 

.mixins-ticket-vertical-three(@width, @height, @r, @left, @l-color, @r-color,@sm-r,@sm-offset,@sm-color) {
  width: @width;
  height: @height;
  // @left - 1px 是爲了不某些百分百比縮放頁面時，出現空隙
  // @r + 1px 是爲了防止出現鋸齒
  // 51% 是爲了防止出現元素中間會有一小段空白區域的狀況
  background: radial-gradient(circle at left top, transparent @r, @l-color  @r + 1px) @left - 1px top ~'/' 100% 51% no-repeat,
  radial-gradient(circle at left bottom, transparent @r, @l-color  @r + 1px) @left - 1px bottom ~'/' 100% 51% no-repeat,
    radial-gradient(circle at  right top, transparent @r, @r-color  @r + 1px ) -(@width - @left) top ~'/' 100% 51% no-repeat,
    radial-gradient(circle at right bottom , transparent @r, @r-color  @r + 1px )  -(@width - @left) bottom ~'/' 100% 51% no-repeat;

  filter: drop-shadow(2px 2px 2px rgba(0, 0, 0, .2));

  &::after {
    content: '';
    position: absolute;
    top: 0;
    right: -@sm-r;
    width: @sm-r;
    height: 100%;
    background-image: radial-gradient(circle at @sm-r, transparent @sm-r, @r-color @sm-r + 1px);
    //background-size: @sm-r;
    background-size: @sm-r @sm-offset;
  }
}

.parent {
  .mixins-ticket-vertical-three(200px, 200px, 10px, 150px, #fc3a28, #fc3a28,5px,20px,#fc3a28);
}

.child {
  line-height: 200px;
}
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注意事項

// ticket.less

//background: radial-gradient(circle at top right, transparent @r, @lcolor 0) -(@width - @left) top ~'/' 100% 55% no-repeat;
// 將上面的這行代碼拆解以下：
//background-image: radial-gradient(circle at top right, transparent @r, @lcolor 0);
//background-position:-(@width - @left) top ;
//background-size:100% 55% ;
//background-repeat: no-repeat;

/*注意：這裏先是有 50px 的透明區域，緊接着第二個區域設置了 0 ，能夠理解爲從這裏開始從新設置樣式區間*/
/*background: radial-gradient(circle at top right, transparent 50px, red 0, #66a8ff 50%);*/

/*在Chrome下，若是兩個區域之間顏色直接以 0 誤差過渡，會有比較嚴重的鋸齒*/
/*background: radial-gradient(10px at left,transparent 50%,#F6327C 50%);*/
/*background: radial-gradient(10px at left,transparent 50%,#F6327C 55%);*/

/*加陰影效果*/
/*filter: drop-shadow(2px 2px 2px rgba(0,0,0,.2));*/

/*多個徑向漸變累加*/
/*background: radial-gradient(50px 100px ellipse, transparent 40px, yellow 41px, red 49px, transparent 50px), radial-gradient(30px circle, red, red 29px, transparent 30px);*/

複製代碼

參考

radial-gradient（MDN）css3

深刻理解 CSS 徑向漸變 radial-gradientless

10 個 demo 示例學會 CSS3 radial-gradient 徑向漸變wordpress

background-positionpost

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