本文主要是介绍CSS3绘制不规则图形（一），希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
由于近期的项目中出现了不规则的边框和图形， 所以只好提前先温习一下，以前收集的一些CSS3绘制的图形。。。样式绘制的图形比图片的性能要好，体验更佳。
废话不多说，我们直接看效果：
1、三角形系列（三角形、倒三角、左三角、右三角、左上三角、右上三角、左下三角、右下三角）
主要用到的是：宽度高度设置为0， border的各个边的设置（各个边的透明或不透明）；
.triangle-up {/* 三角形 */width: 0;height: 0;border-left: 50px solid transparent;border-right: 50px solid transparent;border-bottom: 100px solid #f00;}.triangle-down {/* 倒三角 */width: 0;height: 0;border-left: 50px solid transparent;border-right: 50px solid transparent;border-top: 100px solid #f00;}.triangle-left {/* 左三角 */width: 0;height: 0;border-top: 50px solid transparent;border-bottom: 50px solid transparent;border-right: 100px solid #f00;}.triangle-right {/* 右三角 */width: 0;height: 0;border-top: 50px solid transparent;border-bottom: 50px solid transparent;border-left: 100px solid #f00;}.triangle-topleft {/* 左上三角 */width: 0;height: 0;border-right: 100px solid transparent;border-top: 100px solid #f00;}.triangle-topright {/* 右上三角 */width: 0;height: 0;border-left: 100px solid transparent;border-top: 100px solid #f00;}.triangle-downleft {/* 左下三角 */width: 0;height: 0;border-right: 100px solid transparent;border-bottom: 100px solid #f00;}.triangle-downright {/* 右下三角 */width: 0;height: 0;border-left: 100px solid transparent;border-bottom: 100px solid #f00;}2、圆形、椭圆、扇形、圆环、月牙
.circular{ /* 圆形 */width: 100px;height: 100px;background: #f00;border-radius: 50%; }.oval {/* 椭圆 */width: 200px;height: 100px;background: #f00;border-radius: 100px / 50px;}.sector {/* 扇形 */width: 0;height: 0;border-left: 50px solid transparent;border-right: 50px solid transparent;border-top: 100px solid #f00;border-radius: 50%;}.ring {/* 圆环 */width: 100px;height: 100px;border: 5px solid #f00;border-radius: 50%;}.crescent {/* 月牙 */width: 100px;height: 100px;border-radius: 50%;box-shadow: 20px 20px 0 0 #f00;}3、正方形、长方形、菱形、平行四边形、梯形
.square { /* 正方形 */width: 100px;height: 100px;background: #f00;}.rectangle { /* 长方形 */width: 200px;height: 100px;background: #f00;}.rhomb {/* 菱形 */width: 100px;height: 100px;background: #f00;transform: rotate(45deg);}.parallelogram {/* 平行四边形 */width: 200px;height: 100px;background: #f00;transform: skew(-20deg);}.trapezoid {/* 梯形 */width: 100px;height: 0;border-bottom: 100px solid #f00;border-left: 50px solid transparent;border-right: 50px solid transparent;}4、五边形、六边形、八边形
.pentagon {/* 五边形：三角形和梯形的结合 */width: 60px;height: 0;position: relative;border-top: 55px solid #f00;border-left: 25px solid transparent;border-right: 25px solid transparent;}.pentagon:before {content: "";position: absolute;width: 0px;height: 0;border-left: 55px solid transparent;border-right: 55px solid transparent;border-bottom: 35px solid #f00;left: -25px;top: -90px;}.hexagon {/*六边形：在长方形上面和下面各放置一个三角形*/width: 100px;height: 55px;background: #f00;position: relative;}.hexagon:before {content: "";width: 0;height: 0;position: absolute;top: -25px;left: 0;border-left: 50px solid transparent;border-right: 50px solid transparent;border-bottom: 25px solid #f00;}.hexagon:after {content: "";width: 0;height: 0;position: absolute;bottom: -25px;left: 0;border-left: 50px solid transparent;border-right: 50px solid transparent;border-top: 25px solid #f00;}.octagon {/* 八边形：长方形、上下各放置一个梯形 */width: 100px;height: 100px;background: #f00;position: relative;}.octagon:before {content: "";position: absolute;width: 42px;height: 0;border-left: 29px solid #fff;border-right: 29px solid #fff;border-bottom: 30px solid #f00;top: 0;left: 0;}.octagon:after {content: "";position: absolute;width: 42px;height: 0;border-left: 29px solid #fff;border-right: 29px solid #fff;border-top: 30px solid #f00;bottom: 0;left: 0;}5、爱心
.love {/* 爱心 */position: relative;}.love:before {content: "";width: 70px;height: 110px;background: #f00;position: absolute;border-top-left-radius: 50%;border-top-right-radius: 50%;transform: rotate(45deg);}.love:after {content: "";width: 70px;height: 110px;background: #f00;position: absolute;border-top-left-radius: 50%;border-top-right-radius: 50%;transform: rotate(-45deg);left: -30px;}6、无穷大符号
.infinity {/* 无穷大 */width: 190px;height: 100px;position: relative;}.infinity:before {content: "";width: 50px;height: 50px;position: absolute;top: 0;left: 0;border: 20px solid #f00;border-radius: 50px 50px 0 50px;transform: rotate(-45deg);}.infinity:after {content: "";width: 50px;height: 50px;position: absolute;top: 0;right: 0;border: 20px solid #f00;border-radius: 50px 50px 50px 0;transform: rotate(45deg);}7、鸡蛋
.egg {/* 鸡蛋 */width: 120px;height: 180px;background: #f00;border-radius: 60% 60% 60% 60% / 70% 70% 50% 50%;}8、食人豆
.pacman {/* 食人豆 */width: 0;height: 0;border: 60px solid #f00;border-right: 60px solid transparent;border-radius: 100%;}9、对话框
.alertDialog {/* 对话框：一个圆角矩形和一个小三角形 */width: 150px;height: 100px;background: #f00;border-radius: 10px;position: relative;}.alertDialog:before {content: "";width: 0;height: 0;position: absolute;left: -20px;top: 40px;border-top: 10px solid transparent;border-bottom: 10px solid transparent;border-right: 20px solid #f00; }10、钻石
.diamond {/* 钻石：梯形和三角形组成 */width: 50px;height: 0;position: relative;border-bottom: 25px solid #f00;border-left: 25px solid transparent;border-right: 25px solid transparent;}.diamond:before {content: "";width: 0;height: 0;position: absolute;border-left: 50px solid transparent;border-right: 50px solid transparent;border-top: 70px solid #f00;left: -25px;top: 25px;}11、八卦图
.eightDiagrams {/* 八卦：多个圆形组成 */width: 100px;height: 50px;border-color: #f00;border-width: 2px 2px 50px 2px;border-style: solid;border-radius: 50%;position: relative;}.eightDiagrams:before {content: "";position: absolute;width: 12px;height: 12px;background: #fff;border-radius: 50%;top: 50%;left: 0;border: 19px solid #f00;}.eightDiagrams:after {content: "";position: absolute;width: 12px;height: 12px;background: #f00;border-radius: 50%;top: 50%;left: 50%;border: 19px solid #fff;}12、五角星
.starFive {/* 五角星： */width: 0;height: 0;position: relative;border-left: 80px solid transparent;border-right: 80px solid transparent;border-bottom: 60px solid #f00;transform: rotate(35deg);}.starFive:before {content: "";position: absolute;width: 0;height: 0;border-left: 80px solid transparent;border-right: 80px solid transparent;border-bottom: 60px solid #f00;transform: rotate(-70deg);top: 3px;left: -80px;}.starFive:after {content: "";position: absolute;width: 0;height: 0;border-bottom: 60px solid #f00;border-right: 20px solid transparent;border-left: 20px solid transparent;transform: rotate(-35deg);top: -40px;left: -49px;}13、六角形、八角星、十二角星
.starSix {/* 六角形：两个三角形组成 */width: 0;height: 0;position: relative;border-left: 50px solid transparent;border-right: 50px solid transparent;border-bottom: 100px solid #f00;}.starSix:before {content: "";width: 0;height: 0;position: absolute;top: 30px;left: -50px;border-left: 50px solid transparent;border-right: 50px solid transparent;border-top: 100px solid #f00;}.starEight {/* 八角星：两个正方形，旋转角度 */width: 100px;height: 100px;background: #f00;position: relative;}.starEight:before {content: "";width: 100px;height: 100px;background: #f00;position: absolute;top: 0;left: 0;transform: rotate(45deg);}.starTwelve {/* 十二角星：三个正方形，旋转角度 */width: 100px;height: 100px;background: #f00;position: relative;}.starTwelve:before {content: "";width: 100px;height: 100px;background: #f00;position: absolute;top: 0;left: 0;transform: rotate(-30deg)}.starTwelve:after {content: "";width: 100px;height: 100px;background: #f00;position: absolute;top: 0;left: 0;transform: rotate(30deg)}源代码地址： 稍后会将源代码地址贴出。。。
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