如何使用 CSS 将 'div' 塑造成旗帜

How to get 'div' shaped as a flag with CSS

我想在网站上的一些元素上添加标签,并设计一个标签,该标签是一个底部带有倒 V 形切口的旗帜。

到目前为止我有这个:

HTML

<div class="css-shapes"></div>

CSS

.css-shapes{
    border-left: 99px solid #f00fff;
    border-right: 99px solid #f00fff;
    border-bottom: 39px solid transparent;
}

http://jsfiddle.net/yhexkm4u/2/

但是,我需要背景为白色,并以紫色和 1 像素围绕此形状设置边框。我试图将相同的形状放入白色内部,但一切都变得混乱并且没有按预期进行。

也许这是一种错误的方法,但我希望最终得到看起来像这样的标签:

一个快速的解决方法是旋转它:

 transform: rotate(90deg);

Fiddle


另一种解决方案是 SVG 路径,here's a fiddle!

这是我的想法。

Link Fiddle

它符合您要查找的内容,但我想它应该有一个 "better way" 而不是玩弄边框。

HTML

<div id="text-div">
    Text
</div>
<div id="pacman">
    <div id="left-triangle"></div>
    <div id="right-triangle"></div>
</div>

CSS

#text-div {
    width: 118px;
    height: 60px;
    text-align: center;
    border: 1px solid purple;
    border-bottom: 0px;
    line-height: 60px;
}

#pacman { 
    width: 0px; 
    height: 0px;
    border-right: 60px solid purple; 
    border-top: 0px; 
    border-left: 60px solid purple; 
    border-bottom: 60px solid transparent;
}

#left-triangle{
    position: relative;
    left: -59px;
    border-right: 58px solid transparent; 
    border-top: 0px; 
    border-left: 58px solid white; 
    border-bottom: 58px solid transparent;
}
#right-triangle{
    position: relative;
    top: -59px;
    left: -57px;
    border-right: 58px solid white;
    border-top: 0px; 
    border-left: 58px solid transparent; 
    border-bottom: 58px solid transparent;
}

我已经尝试更新您的 CSS 以创建您想要的效果:

.css-shapes {
  height: 250px;
  width: 0px;
  border-left: 99px solid #f00fff;
  border-right: 99px solid #f00fff;
  border-bottom: 39px solid transparent;
  position: relative
}
.n-shape {
  height: 248px;
  width: 0px;
  border-left: 95px solid #ffffff;
  border-right: 95px solid #ffffff;
  border-bottom: 39px solid transparent;
  position: absolute;
  top: -6px;
  right: -95px;
}
.top {
  position: absolute;
  top: 0px;
  width: 198px;
  height: 2px;
  background-color: #f00fff;
  left: -99px;
  border-bottom: 1px solid #f00fff;
}
<div class="css-shapes">
  <div class="n-shape"></div>
  <div class="top"></div>
</div>

Fiddle: http://jsfiddle.net/dywhjwna/

STOLEN FROM CSS-SHAPES

#flag {
  width: 110px;
  height: 56px;
  padding-top: 15px;
  position: relative;
  background: red;
  color: white;
  font-size: 11px;
  letter-spacing: 0.2em;
  text-align: center;
  text-transform: uppercase;
}
#flag:after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 0;
  border-bottom: 13px solid #eee;
  border-left: 55px solid transparent;
  border-right: 55px solid transparent;
}

演示:

#flag {
  width: 110px;
  height: 56px;
  padding-top: 15px;
  position: relative;
  background: red;
  color: white;
  font-size: 11px;
  letter-spacing: 0.2em;
  text-align: center;
  text-transform: uppercase;
}
#flag:after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 0;
  border-bottom: 13px solid #eee;
  border-left: 55px solid transparent;
  border-right: 55px solid transparent;
}
          
<div id="flag"></div>


我的方法

我的方法使用倾斜元素,并允许您根据需要快速定位它们。

div {
  height: 100px;
  width: 100px;
  position: relative;
  border-left: 10px solid tomato;
  border-top: 10px solid tomato;
  border-right: 10px solid tomato;
  text-align: center;
  line-height: 100px;
  font-size: 30px;
}
div:before {
  content: "";
  position: absolute;
  height: 50%;
  width: 50%;
  left: -10px; /*width of border*/
  bottom: -30px;
  z-index: -2;
  -webkit-transform: skewY(-20deg);
  transform: skewY(-20deg);
  border-bottom: 10px solid tomato;
  border-left: 10px solid tomato;
}
div:after {
  content: "";
  position: absolute;
  height: 50%;
  width: 50%;
  right: -10px; /*width of border*/
  bottom: -30px;
  z-index: -2;
  -webkit-transform: skewY(20deg);
  transform: skewY(20deg);
  border-bottom: 10px solid tomato;
  border-right: 10px solid tomato;
}
div:hover, div:hover:before, div:hover:after{
  background:lightgray;
  }
<div>TEXT</div>

这里有一个稍微不同的方法,它使用 pseudo-elements and transform 旋转来创建轮廓横幅,如下所示:

  • 这个有角度的形状是用 position: absolute 伪元素创建的,:before:after:

  • 多余部分在父级上用overflow: hidden剪掉以形成我们的横幅:

  • 轮廓是用box-shadow创建的,通过将x轴拉/推46px来防止两个角度重叠— box-shadow: 46px 0 0 3px #000

完整示例

div {
  height: 100px;
  width: 100px;
  margin: 100px auto;
  position: relative;
  overflow: hidden;
  border: solid 3px #000;
  border-bottom: none;
  text-align: center;
}
div:before,
div:after {
  content: '';
  display: block;
  height: 100%;
  width: 200%;
  transform: rotate(20deg);
  box-shadow: 46px 0 0 3px #000;
  position: absolute;
  top: 1px;
  right: -120%;
}
div:after {
  transform: rotate(-20deg);
  left: -120%;
  box-shadow: -46px 0 0 3px #000;
}
<div>Text</div>

与CSS:

您可以在伪元素上使用 CSS transforms 来创建底部带有 透明倒三角形 的背景:

body{background:url('http://lorempixel.com/image_output/food-q-c-640-480-1.jpg');background-size:cover;}
p{
  position: relative;
  width: 150px; height: 150px;
  overflow: hidden;
  border-top:3px solid #EF0EFE;
}
p:before, p:after{
  content: '';
  position: absolute;
  top: -3px;
  height: 100%; width: 50%;
  z-index: -1;
  border:2px solid #EF0EFE;
  box-sizing:border-box;
}
p:before{
  left: 0;  
  transform-origin: 0 0;
  transform: skewY(-20deg);
  border-width:0 0 4px 3px;
}
p:after{
  right: 0;
  transform-origin: 100% 0;
  transform: skewY(20deg);
  border-width:0 3px 4px 0;
}
<p>Some text ... </p>

请注意,您需要在 transformtransform-origin 属性上添加供应商前缀,以最大化浏览器支持。有关详细信息,请参阅 canIuse


使用 SVG

另一种方法是对多边形元素使用 inline SVG

body{background: url('http://lorempixel.com/image_output/food-q-c-640-480-1.jpg');background-size: cover;}
div{position: relative;width: 100px; height: 150px;}
svg{position: absolute;width: 100%;height: 100%;z-index: -1;}
<div>
  <svg viewbox="-1.5 -1.5 103 153">
    <polygon points="100 0, 100 100, 50 85, 0 100, 0 0" fill="transparent" stroke-width="3" stroke="#ef0efe"/>
  </svg>
  <p>Some text ... </p>
</div>

一个更好的解决方案,文本很容易放在中间,使用矩形背景和底部三角形。

.css-shapes{ 
  position: relative;
  height: 250px; 
  width: 150px; 
  background: #FFD05B;
  color: #fff;
  text-align: center;
  line-height:225px;
  font-size: 90px;
  box-sizing: border-box;
}
.css-shapes:after{
  content: '';
  position:absolute;
  left:0;
  bottom: 0;
  display: block;
  width: 100%;
  height:50px;
  border-bottom: 25px solid #fff;
  border-left: 75px solid transparent;
  border-right: 75px solid transparent;
  box-sizing: border-box;
}
<div class="css-shapes">1</div>