CSS绘制各种各样的形体和图形

我们可以用css属性绘制各种各样的形状图形，如实心圆、心形、八卦阵图、三角形、四叶草、无穷符号、对话框、立体球型等，用到的属性有border-radius、position定位，伪元素after和before、border边框、渐变等

实心圆

.circle {
    width: 120px;
    height: 120px;
    background: #317ef3;
    border-radius: 100%;
}

圆环

.ring {
    width: 120px;
    height: 120px;
    border: 10px solid #317ef3;
    border-radius: 100%;
    box-sizing: border-box;
}

半圆（四个不同的方向）

.top-semicircle {
    width: 120px;
    height: 60px;
    background: #317ef3;
    border-radius: 60px 60px 0 0;
}

.lf-semicircle {
    width: 60px;
    height: 120px;
    background: #317ef3;
    border-radius: 0 60px 60px 0;
}

.rt-semicircle {
    width: 60px;
    height: 120px;
    background: #317ef3;
    border-radius: 60px 0 0 60px;
}

.bot-semicircle {
    width: 120px;
    height: 60px;
    background: #317ef3;
    border-radius: 0 0 60px 60px;
}

四分之一圆（扇形）

.toplf-sector,
.toprt-sector,
.botlf-sector,
.botrt-sector {
    width: 60px;
    height: 60px;
    background: #317ef3;
}

.toprt-sector {
    border-radius: 60px 0 0 0;
}

.toplf-sector {
    border-radius: 0 60px 0 0;
}

.botlf-sector {
    border-radius: 0 0 60px 0;
}

.botrt-sector {
    border-radius: 0 0 0 60px;
}

心形

.love {
    width: 100px;
    height: 100px;
    background: #317ef3;
    position: relative;
    transform: rotate(45deg);
    -webkit-transform: rotate(45deg);
    -moz-transform: rotate(45deg);
    -o-transform: rotate(45deg);
}

.love:after {
    content: "";
    width: 50px;
    height: 100px;
    background: #317ef3;
    border-radius: 50px 0 0 50px;
    position: absolute;
    right: 99px;
    top: 0;
}

.love::before {
    content: "";
    width: 100px;
    height: 50px;
    background: #317ef3;
    border-radius: 50px 50px 0 0;
    position: absolute;
    bottom: 99px;
    left: 0;
}

吃豆人

.eat {
    width: 0;
    height: 0;
    border: 60px solid #317ef3;
    border-radius: 100%;
    border-right-color: transparent;
}

鸡蛋

.egg {
    width: 100px;
    height: 150px;
    background: #317ef3;
    border-radius: 50px 50px 50px 50px/90px 90px 60px 60px;
}

椭圆（水平）

.ellipse1 {
    width: 180px;
    height: 120px;
    background: #317ef3;
    border-radius: 100%;
}

椭圆（垂直）

.ellipse2 {
    width: 120px;
    height: 180px;
    background: #317ef3;
    border-radius: 100%;
}

胶囊（水平）

.capsule1 {
    width: 200px;
    height: 100px;
    background: #317ef3;
    border-radius: 50px;
}

胶囊（垂直）

.capsule2 {
    width: 100px;
    height: 200px;
    background: #317ef3;
    border-radius: 50px;
}

太极八卦阵图

.taiji {
    width: 120px;
    height: 60px;
    background: #fff;
    border: 2px solid #317ef3;
    border-bottom: 60px solid #317ef3;
    border-radius: 100%;
    position: relative;
}

.taiji::before {
    content: "";
    position: absolute;
    left: 0;
    top: 50%;
    width: 20px;
    height: 20px;
    background: #fff;
    border: 20px solid #317ef3;
    border-radius: 100%;
}

.taiji::after {
    content: "";
    position: absolute;
    right: 0;
    top: 50%;
    width: 20px;
    height: 20px;
    background: #317ef3;
    border: 20px solid #fff;
    border-radius: 100%;
}

四叶草

.four-leaf {
    width: 210px;
    height: 210px;
    position: relative;
}

.four-leaf span {
    display: block;
    width: 100px;
    height: 100px;
    background: #317ef3;
    position: absolute;
}

.four-leaf span.leaf1 {
    left: 0;
    top: 0;
    border-radius: 50px 50px 0 50px;
}

.four-leaf span.leaf2 {
    right: 0;
    top: 0;
    border-radius: 50px 50px 50px 0;
}

.four-leaf span.leaf3 {
    left: 0;
    bottom: 0;
    border-radius: 50px 0 50px 50px;
}

.four-leaf span.leaf4 {
    right: 0;
    bottom: 0;
    border-radius: 0 50px 50px 50px;
}

花瓣（叶子）

.leaf5 {
    width: 100px;
    height: 100px;
    background: #317ef3;
    border-radius: 0 100px;
}

.leaf6 {
    width: 100px;
    height: 100px;
    background: #317ef3;
    border-radius: 80px 0px;
}

五叶花

.five-petal {
    width: 160px;
    height: 160px;
}

.five-petal span {
    display: block;
    width: 80px;
    height: 80px;
    background: #317ef3;
    border-radius: 0 100px;
    transform-origin: 100% 100%;
    position: absolute;
}

.five-petal .petal2 {
    transform: rotate(72deg);
}

.five-petal .petal3 {
    transform: rotate(144deg);
}

.five-petal .petal4 {
    transform: rotate(216deg);
}

.five-petal .petal5 {
    transform: rotate(288deg);
}

无穷符号

.infinite {
    width: 250px;
    position: relative;
}

.infinite span {
    width: 100px;
    height: 100px;
    background: #fff;
    border: 2px solid #317ef3;
    position: absolute;
}

.infinite .lf {
    border-radius: 50px 50px 0 50px;
    transform: rotate(-45deg);
    left: 0;
}

.infinite .rt {
    border-radius: 50px 50px 50px 0;
    transform: rotate(45deg);
    right: 0;
}

小尾巴

.xwb1 {
    width: 100px;
    height: 60px;
    border-top: 20px solid #317ef3;
    border-radius: 0 60px 0 0;
}

.xwb2 {
    width: 100px;
    height: 60px;
    border-left: 20px solid #317ef3;
    border-radius: 60px 0 0 0;
}

月亮

.moon {
    width: 100px;
    height: 100px;
    border-left: 30px solid #317ef3;
    border-radius: 50px 0 0 50px;
}

绘制三角形原理图

.triangle-shiyi {
    width: 0;
    height: 0;
    border: 50px solid #317ef3;
    border-left-color: red;
    border-top-color: aquamarine;
    border-right-color: bisque;
}

等腰直角三角形

.dbzj-sanjiao1 {
    width: 0;
    height: 0;
    border-bottom: 100px solid #317ef3;
    border-right: 100px solid transparent;
}

.dbzj-sanjiao2 {
    width: 0;
    height: 0;
    border-bottom: 100px solid #317ef3;
    border-left: 100px solid transparent;
}

.dbzj-sanjiao3 {
    width: 0;
    height: 0;
    border-top: 100px solid #317ef3;
    border-right: 100px solid transparent;
}

.dbzj-sanjiao4 {
    width: 0;
    height: 0;
    border-top: 100px solid #317ef3;
    border-left: 100px solid transparent;
}

直角三角形

.dbzj-sanjiao5 {
    width: 0;
    height: 0;
    border-bottom: 50px solid #317ef3;
    border-left: 100px solid transparent;
    /* border-left、border-right决定宽度 */
    /* border-top、border-bottom决定高度 */
}

.dbzj-sanjiao6 {
    width: 0;
    height: 0;
    border-bottom: 50px solid #317ef3;
    border-right: 100px solid transparent;
}

.dbzj-sanjiao7 {
    width: 0;
    height: 0;
    border-bottom: 100px solid #317ef3;
    border-right: 50px solid transparent;
}

.dbzj-sanjiao8 {
    width: 0;
    height: 0;
    border-bottom: 100px solid #317ef3;
    border-left: 50px solid transparent;
}

.dbzj-sanjiao9 {
    width: 0;
    height: 0;
    border-top: 50px solid #317ef3;
    border-right: 100px solid transparent;
}

.dbzj-sanjiao10 {
    width: 0;
    height: 0;
    border-top: 50px solid #317ef3;
    border-left: 100px solid transparent;
}

锐角三角形

.dbzj-sanjiao11 {
    width: 0;
    height: 0;
    border-left: 40px solid transparent;
    border-right: 40px solid transparent;
    border-bottom: 100px solid #317ef3;
}

钝角三角形

.dbzj-sanjiao12 {
    width: 0;
    height: 0;
    border-bottom: 50px solid #317ef3;
    border-right: 100px solid transparent;
    position: relative;
}

.dbzj-sanjiao12::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0;
    border-bottom: 50px solid #fff;
    border-right: 20px solid transparent;
}

平行四边形

.pxsbx1 {
    width: 200px;
    height: 120px;
    background: #317ef3;
    color: #fff;
    text-align: center;
    line-height: 120px;
    font-size: 18px;
    transform: skewX(30deg);
}

有时候我们需要的效果是平行四边形里面的文字不倾斜，实现的方法可以是在利用伪元素和定位方法结合，在文字后面添加伪元素

.pxsbx2 {
    width: 200px;
    height: 120px;
    text-align: center;
    line-height: 120px;
    position: relative;
    font-size: 18px;
    color: #fff;
}

.pxsbx2::after {
    content: "";
    position: absolute;
    left: 0;
    top: 0;
    z-index: -1;
    width: 200px;
    height: 120px;
    background: #317ef3;
    transform: skewX(30deg);
}

.pxsbx3 {
    width: 100px;
    height: 160px;
    background: #317ef3;
    transform: skewY(30deg);
}

.pxsbx4 {
    width: 100px;
    height: 160px;
    background: #317ef3;
    transform: skewY(-30deg);
}

等腰梯形

.tixing1 {
    width: 100px;
    height: 0;
    border-bottom: 100px solid #317ef3;
    border-left: 50px solid transparent;
    border-right: 50px solid transparent;
}

直角梯形

.tixing2 {
    width: 100px;
    height: 100px;
    background: #317ef3;
    position: relative;
}

.tixing2::before {
    content: "";
    width: 0;
    height: 0;
    border-bottom: 100px solid #317ef3;
    border-right: 50px solid transparent;
    position: absolute;
    left: 100%;
    top: 0;
}

边框对话框

.duihuakuang1 {
    width: 200px;
    height: 120px;
    border: 2px solid #317ef3;
    position: relative;
}

.duihuakuang1::before {
    content: "";
    position: absolute;
    left: 40px;
    top: 92%;
    width: 20px;
    height: 20px;
    border-right: 2px solid #317ef3;
    border-bottom: 2px solid #317ef3;
    transform: rotate(45deg);
    background: #fff;
}

立体球型

.litiqiuxing1 {
    width: 100px;
    height: 100px;
    border-radius: 100%;
    background: #317ef3;
    background: radial-gradient(circle at 25% 35%, #fff, #317ef3, #071529);
}

.litiqiuxing2 {
    width: 100px;
    height: 100px;
    border-radius: 100%;
    background: #317ef3;
    background: radial-gradient(circle at top, #fff, #317ef3, #071529)
}

.litiqiuxing3 {
    width: 100px;
    height: 100px;
    border-radius: 100%;
    background: #317ef3;
    background: radial-gradient(circle at left top, #fff 10%, #78a8f2 30%, #0b59ca 60%, #04409a 80%, #202b3a 100%)
}