奇妙的 CSS几何图形

三角形：通常会使用透明的border模拟出一个三角形：▲

.traingle {

    width:;

    height:;

    border-left: 50px solid transparent;

    border-right: 50px solid transparent;

    border-bottom: 100px solid yellowgreen;

}

切角：采用多重线性渐变实现切角

.notching {

    width: 40px;

    height: 40px;

    padding: 40px;

    background: linear-gradient(135deg, transparent 15px, yellowgreen 0) top left,

        linear-gradient(-135deg, transparent 15px, yellowgreen 0) top right,

        linear-gradient(-45deg, transparent 15px, yellowgreen 0) bottom right,

        linear-gradient(45deg, transparent 15px, yellowgreen 0) bottom left;

    background-size: 50% 50%;

    background-repeat: no-repeat;

}

梯形：利用伪元素加旋转透视实现梯形

 .trapezoid{

    position: relative;

    width: 60px;

    padding: 60px;

}

.trapezoid::before{

    content:"";

    position: absolute;

    top:; right:; bottom:; left:;

    transform: perspective(20px) scaleY(1.3) rotateX(5deg);

    transform-origin: bottom;

    background: yellowgreen;

}

当然，还有另一种更简单的方法是利用border实现，借助上面的构造三角形的方法，在矩形两侧构造两个透明的三角形

.trapezoid {

    position: relative;

    width: 60px;

    border-top: 60px solid yellowgreen;

    border-left: 40px solid transparent;

    border-right: 40px solid transparent;

}

五边形：梯形加上三角形，很容易就组合成一个五边形，这里需要借助一个伪元素实现

.pentagon {

    position: relative;

    width: 60px;

    border-bottom: 60px solid yellowgreen;

    border-left: 40px solid transparent;

    border-right: 40px solid transparent;

}

.pentagon::before {

    content:"";

    position: absolute;

    top: 60px;

    left: -40px;

    border-top: 60px solid yellowgreen;

    border-left: 70px solid transparent;

    border-right: 70px solid transparent;

}

六边形：看看上面的梯形，如果两个反方向且底边同样大小的梯形，叠加在一起，是不是就能得到一个六边形呢？

.pentagon {

    position: relative;

    width: 60px;

    border-bottom: 60px solid yellowgreen;

    border-left: 40px solid transparent;

    border-right: 40px solid transparent;

}

.pentagon::before {

    content: "";

    position: absolute;

    width: 60px;

    height: 0px;

    top: 60px;

    left: -40px;

    border-top: 60px solid yellowgreen;

    border-left: 40px solid transparent;

    border-right: 40px solid transparent;

}

八边形：六边形都解决了，八边形也不在话下，一个矩形加上两个梯形，可以合成一个八边形

.octagon {

    position: relative;

    width: 40px;

    height: 100px;

    background: yellowgreen;

}

.octagon::before {

    content: "";

    height: 60px;

    position: absolute;

    top:;

    left: 40px;

    border-left: 30px solid yellowgreen;

    border-top: 20px solid transparent;

    border-bottom: 20px solid transparent;

}

.octagon::after {

    content: "";

    height: 60px;

    position: absolute;

    top:;

    left: -30px;

    border-right: 30px solid yellowgreen;

    border-top: 20px solid transparent;

    border-bottom: 20px solid transparent;

}

五角星：3 个三角形叠加旋转在一起实现 ★

.star {

   margin: 50px 0;

   position: relative;

   width:;

   border-right: 100px solid transparent;

   border-bottom: 70px  solid yellowgreen;

   border-left: 100px solid transparent;

   transform: rotate(35deg) scale(.6);

}

.star:before {

    content: ‘‘;

    position: absolute;

    border-bottom: 80px solid yellowgreen;

    border-left: 30px solid transparent;

    border-right: 30px solid transparent;

    top: -45px;

    left: -65px;

    transform: rotate(-35deg);

}

.star:after {

    content: ‘‘;

    position: absolute;

    top: 3px;

    left: -105px;

    border-right: 100px solid transparent;

    border-bottom: 70px solid yellowgreen;

    border-left: 100px solid transparent;

    transform: rotate(-70deg);

}

六角星：一个向上的三角形 ▲，叠加上一个向下的三角形 ▼，就可以得到一个六边形

.sixstar {

    position: relative;

    width:;

    border-left: 50px solid transparent;

    border-right: 50px solid transparent;

    border-bottom: 100px solid yellowgreen;

}

.sixstar:after {

    content: "";

    position: absolute;

    border-left: 50px solid transparent;

    border-right: 50px solid transparent;

    border-top: 100px solid yellowgreen;

    top: 30px;

    left: -50px;

}

八角星：其实使用两个矩形进行旋转拼接就可以了

.eightstar {

    position: relative;

    width: 100px;

    height: 100px;

    background-color: yellowgreen;

    transform: rotate(30deg);

}

.eightstar::before {

    content: "";

    position: absolute;

    top:;

    left:;

    width: 100px;

    height: 100px;

    transform: rotate(45deg);

    background-color: yellowgreen;

}

十二角星： 最后多角星再来一个十二级角星。在八角星的基础上，再增加一个矩形，就能得到十二角啦。也就是要过第一个伪元素。

.twelvestar {

    position: relative;

    width: 100px;

    height: 100px;

    margin-bottom: 100px!important;

    background-color: yellowgreen;

    transform: rotate(30deg);

}

.twelvestar::before {

    content: "";

    position: absolute;

    top:;

    left:;

    width: 100px;

    height: 100px;

    transform: rotate(30deg);

    background-color: yellowgreen;

}

.twelvestar::after {

    content: "";

    position: absolute;

    top:;

    left:;

    width: 100px;

    height: 100px;

    transform: rotate(60deg);

    background-color: yellowgreen;

}

椭圆：使用传统的方法画一个椭圆，过去 CSS3 画椭圆，基本上只能借助 border 实现

.ellipse { #这里使用 border 画一个蛋的形状

   width: 120px;

   height: 160px;

   background-color: yellowgreen;

   border-radius: 50% 50% 50% 50% / 60% 60% 40% 40%;

}

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奇妙的 CSS几何图形

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