一、三角形
1、CSS画等腰三角形
2、画直角三角形：
二、画圆形
注意：border-radius是width/height的一半（50%）。
画半圆：
半圆的画法是把高度设为宽度的一半，并且也只设置左上角和右上角的半径，且半径为宽度的一半。
画四分之一圆：是把高度和宽度设置为相等，只设置一个圆角，其半径等于高度或宽度。
三、画椭圆
斜杠前面的一组四个值分别表示四个角的水平半径；斜杠后面的一组四个值分别表示四个角的垂直半径。
四、平行四边形
margin-left是为了使得平行四边形可以全部在浏览器中显示出来
五、梯形
高度为0。有宽度没高度。
六、五边形、六边形
给你一个例子：
<!doctype html><html>
<head>
<meta charset="utf-8">
<title>css动画</title>
<style>
*, *:before, *:after {
box-sizing: border-box
margin: 0
padding: 0
}
:root, html, body {
font-family: 'Poiret One', 'Open Sans', 'Helvetica Neue', 'Helvetica', 'Arial', sans-serif
background: #222
color: white
}
h1 {
text-align: center
margin: 1rem auto 2rem
font-weight: normal
}
p {
margin: 1rem
}
.row {
width: 80%
height: 150px
margin: 2rem auto
}
.cell {
display: inline-block
width: 49%
text-align: center
}
.circle {
display: inline-block
width: 100px
height: 100px
border-radius: 50%
background: whiteSmoke
box-shadow: 4px -40px 60px 5px rgb(26, 117, 206) inset
}
.square {
display: inline-block
width: 100px
height: 100px
border-radius: 20px
background: whiteSmoke
box-shadow: 4px -40px 60px 5px rgb(26, 117, 206) inset
}
.loader {
background: linear-gradient(to right, rgb(22, 113, 202) 50%, transparent 50%)
animation: spin 1s infinite linear
}
.loader:before {
display: block
content: ''
position: relative
top: 50%
left: 50%
transform: translate(-50%, -50%)
width: 90px
height: 90px
background: #222
border-radius: 50%
}
.gelatine {
animation: gelatine 0.5s infinite
}
@keyframes gelatine {
from, to { transform: scale(1, 1) }
25% { transform: scale(0.9, 1.1) }
50% { transform: scale(1.1, 0.9) }
75% { transform: scale(0.95, 1.05) }
}
.spin {
animation: spin 1s infinite linear
}
@keyframes spin {
from { transform: rotate(0deg) }
to { transform: rotate(360deg) }
}
.elastic-spin {
animation: elastic-spin 1s infinite ease
}
@keyframes elastic-spin {
from { transform: rotate(0deg) }
to { transform: rotate(720deg) }
}
.pulse {
animation: pulse 1s infinite ease-in-out alternate
}
@keyframes pulse {
from { transform: scale(0.8) }
to { transform: scale(1.2) }
}
.flash {
animation: flash 500ms ease infinite alternate
}
@keyframes flash {
from { opacity: 1 }
to { opacity: 0 }
}
.hithere {
animation: hithere 1s ease infinite
}
@keyframes hithere {
30% { transform: scale(1.2) }
40%, 60% { transform: rotate(-20deg) scale(1.2) }
50% { transform: rotate(20deg) scale(1.2) }
70% { transform: rotate(0deg) scale(1.2) }
100% { transform: scale(1) }
}
.grow {
animation: grow 2s ease infinite
}
@keyframes grow {
from { transform: scale(0) }
to { transform: scale(1) }
}
.fade-in {
animation: fade-in 2s linear infinite
}
@keyframes fade-in {
from { opacity: 0 }
to { opacity: 1 }
}
.fade-out {
animation: fade-out 2s linear infinite
}
@keyframes fade-out {
from { opacity: 1 }
to { opacity: 0 }
}
.bounce {
animation: bounce 2s ease infinite
}
@keyframes bounce {
70% { transform:translateY(0%) }
80% { transform:translateY(-15%) }
90% { transform:translateY(0%) }
95% { transform:translateY(-7%) }
97% { transform:translateY(0%) }
99% { transform:translateY(-3%) }
100% { transform:translateY(0) }
}
.bounce2 {
animation: bounce2 2s ease infinite
}
@keyframes bounce2 {
0%, 20%, 50%, 80%, 100% {transform: translateY(0)}
40% {transform: translateY(-30px)}
60% {transform: translateY(-15px)}
}
.shake {
animation: shake 2s ease infinite
}
@keyframes shake {
0%, 100% {transform: translateX(0)}
10%, 30%, 50%, 70%, 90% {transform: translateX(-10px)}
20%, 40%, 60%, 80% {transform: translateX(10px)}
}
.flip {
backface-visibility: visible !important
animation: flip 2s ease infinite
}
@keyframes flip {
0% {
transform: perspective(400px) rotateY(0)
animation-timing-function: ease-out
}
40% {
transform: perspective(400px) translateZ(150px) rotateY(170deg)
animation-timing-function: ease-out
}
50% {
transform: perspective(400px) translateZ(150px) rotateY(190deg) scale(1)
animation-timing-function: ease-in
}
80% {
transform: perspective(400px) rotateY(360deg) scale(.95)
animation-timing-function: ease-in
}
100% {
transform: perspective(400px) scale(1)
animation-timing-function: ease-in
}
}
.swing {
transform-origin: top center
animation: swing 2s ease infinite
}
@keyframes swing {
20% { transform: rotate(15deg) }
40% { transform: rotate(-10deg) }
60% { transform: rotate(5deg) }
80% { transform: rotate(-5deg) }
100% { transform: rotate(0deg) }
}
.wobble {
animation: wobble 2s ease infinite
}
@keyframes wobble {
0% { transform: translateX(0%) }
15% { transform: translateX(-25%) rotate(-5deg) }
30% { transform: translateX(20%) rotate(3deg) }
45% { transform: translateX(-15%) rotate(-3deg) }
60% { transform: translateX(10%) rotate(2deg) }
75% { transform: translateX(-5%) rotate(-1deg) }
100% { transform: translateX(0%) }
}
.fade-in-down {
animation: fade-in-down 2s ease infinite
}
@keyframes fade-in-down {
0% {
opacity: 0
transform: translateY(-20px)
}
100% {
opacity: 1
transform: translateY(0)
}
}
.fade-in-left {
animation: fade-in-left 2s ease infinite
}
@keyframes fade-in-left {
0% {
opacity: 0
transform: translateX(-20px)
}
100% {
opacity: 1
transform: translateX(0)
}
}
.fade-out-down {
animation: fade-out-down 2s ease infinite
}
@keyframes fade-out-down {
0% {
opacity: 1
transform: translateY(0)
}
100% {
opacity: 0
transform: translateY(20px)
}
}
.fade-out-right {
animation: fade-out-right 2s ease infinite
}
@keyframes fade-out-right {
0% {
opacity: 1
transform: translateX(0)
}
100% {
opacity: 0
transform: translateX(20px)
}
}
.bounce-in {
animation: bounce-in 2s ease infinite
}
@keyframes bounce-in {
0% {
opacity: 0
transform: scale(.3)
}
50% {
opacity: 1
transform: scale(1.05)
}
70% { transform: scale(.9) }
100% { transform: scale(1) }
}
.bounce-in-right {
animation: bounce-in-right 2s ease infinite
}
@keyframes bounce-in-right {
0% {
opacity: 0
transform: translateX(2000px)
}
60% {
opacity: 1
transform: translateX(-30px)
}
80% { transform: translateX(10px) }
100% { transform: translateX(0) }
}
.bounce-out {
animation: bounce-out 2s ease infinite
}
@keyframes bounce-out {
0% { transform: scale(1) }
25% { transform: scale(.95) }
50% {
opacity: 1
transform: scale(1.1)
}
100% {
opacity: 0
transform: scale(.3)
}
}
.bounce-out-down {
animation: bounce-out-down 2s ease infinite
}
@keyframes bounce-out-down {
0% { transform: translateY(0) }
20% {
opacity: 1
transform: translateY(-20px)
}
100% {
opacity: 0
transform: translateY(20px)
}
}
.rotate-in-down-left {
animation: rotate-in-down-left 2s ease infinite
}
@keyframes rotate-in-down-left {
0% {
transform-origin: left bottom
transform: rotate(-90deg)
opacity: 0
}
100% {
transform-origin: left bottom
transform: rotate(0)
opacity: 1
}
}
.rotate-in-up-left {
animation: rotate-in-up-left 2s ease infinite
}
@keyframes rotate-in-up-left {
0% {
transform-origin: left bottom
transform: rotate(90deg)
opacity: 0
}
100% {
transform-origin: left bottom
transform: rotate(0)
opacity: 1
}
}
.hinge {
animation: hinge 2s ease infinite
}
@keyframes hinge {
0% { transform: rotate(0) transform-origin: top left animation-timing-function: ease-in-out }
20%, 60% { transform: rotate(80deg) transform-origin: top left animation-timing-function: ease-in-out }
40% { transform: rotate(60deg) transform-origin: top left animation-timing-function: ease-in-out }
80% { transform: rotate(60deg) translateY(0) opacity: 1 transform-origin: top left animation-timing-function: ease-in-out }
100% { transform: translateY(700px) opacity: 0 }
}
.roll-in {
animation: roll-in 2s ease infinite
}
@keyframes roll-in {
0% {
opacity: 0
transform: translateX(-100%) rotate(-120deg)
}
100% {
opacity: 1
transform: translateX(0px) rotate(0deg)
}
}
.roll-out {
animation: roll-out 2s ease infinite
}
@keyframes roll-out {
0% {
opacity: 1
transform: translateX(0px) rotate(0deg)
}
100% {
opacity: 0
transform: translateX(100%) rotate(120deg)
}
}
</style>
</head>
<body>
<h1>CSS Animation</h1>
<div class="row">
<div class="cell">
<div class="circle loader"></div>
<p>loader</p>
</div>
<div class="cell">
<div class="circle gelatine"></div>
<p>gelatine</p>
</div>
</div>
<div class="row">
<div class="cell">
<div class="circle spin"></div>
<p>spin</p>
</div>
<div class="cell">
<div class="circle elastic-spin"></div>
<p>elastic spin</p>
</div>
</div>
<div class="row">
<div class="cell">
<div class="circle pulse"></div>
<p>pulse</p>
</div>
<div class="cell">
<div class="circle flash"></div>
<p>flash</p>
</div>
</div>
<div class="row">
<div class="cell">
<div class="square hithere"></div>
<p>hi there!</p>
</div>
<div class="cell">
<div class="circle grow"></div>
<p>grow</p>
</div>
</div>
<div class="row">
<div class="cell">
<div class="circle fade-in"></div>
<p>fade in</p>
</div>
<div class="cell">
<div class="circle fade-out"></div>
<p>fade out</p>
</div>
</div>
<div class="row">
<div class="cell">
<div class="circle bounce"></div>
<p>bounce</p>
</div>
<div class="cell">
<div class="circle bounce2"></div>
<p>bounce 2</p>
</div>
</div>
<div class="row">
<div class="cell">
<div class="circle shake"></div>
<p>shake</p>
</div>
<div class="cell">
<div class="circle flip"></div>
<p>flip</p>
</div>
</div>
<div class="row">
<div class="cell">
<div class="circle swing"></div>
<p>swing</p>
</div>
<div class="cell">
<div class="circle wobble"></div>
<p>wobble</p>
</div>
</div>
<div class="row">
<div class="cell">
<div class="circle fade-in-down"></div>
<p>fade in down</p>
</div>
<div class="cell">
<div class="circle fade-in-left"></div>
<p>fade in left</p>
</div>
</div>
<div class="row">
<div class="cell">
<div class="circle fade-out-down"></div>
<p>fade out down</p>
</div>
<div class="cell">
<div class="circle fade-out-right"></div>
<p>fade out right</p>
</div>
</div>
<div class="row">
<div class="cell">
<div class="circle bounce-in"></div>
<p>bounce in</p>
</div>
<div class="cell">
<div class="circle bounce-in-right"></div>
<p>bounce in right</p>
</div>
</div>
<div class="row">
<div class="cell">
<div class="circle bounce-out"></div>
<p>bounce out</p>
</div>
<div class="cell">
<div class="circle bounce-out-down"></div>
<p>bounce out down</p>
</div>
</div>
<div class="row">
<div class="cell">
<div class="circle rotate-in-down-left"></div>
<p>rotate in down left</p>
</div>
<div class="cell">
<div class="circle rotate-in-up-left"></div>
<p>rotate in up left</p>
</div>
</div>
<div class="row">
<div class="cell">
<div class="circle roll-in"></div>
<p>roll in</p>
</div>
<div class="cell">
<div class="circle roll-out"></div>
<p>roll out</p>
</div>
</div>
<div class="row">
<div class="cell">
<div class="circle hinge"></div>
<p>hinge</p>
</div>
</div>
</body>
</html>
实现思路：
用一个铺满蓝色的背景的盒子，
利用：：before与after画2个圆角值不同的不规则圆形（其中一个设置透明度或者其他颜色，以便区分）：
父元素设置overflow:hidden；
最后加上animation 动画让不同规则圆形旋转起来即可:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
</head>
<body>
<div class="wave"></div>
</body>
<style>
/* // 简单的盒子 */
.wave {
position: relative
width: 150px
height: 150px
background-color: #5291e0
/* overflow: hidden*/
}
/* // 两个不规则圆形（相对盒子进行定位，距离底部距离则为波浪高度） */
.wave::before,
.wave::after {
content: ""
position: absolute
left: 50%
bottom: 15%
width: 500%
height: 500%
border-radius: 45%
background-color: #fff
transform: translateX(-50%)
animation: rotate 15s linear infinite
}
/* // 其中一个不规则圆形调整一下样式，以便区分（或者调整animation的参数来区分） */
.wave::before {
bottom: 10%
opacity: .5
border-radius: 47%
}
/* // 旋转动画 */
@keyframes rotate {
from {
transform: translateX(-50%) rotateZ(0deg)
}
to {
transform: translateX(-50%) rotateZ(360deg)
}
}
</style>
</html>
