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: 0;
    height: 0;
    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: 0; right: 0; bottom: 0; left: 0;
    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;
}

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