如何用纯css实现一个动态画圆环效果

2023-02-22 02:48:02html-css06

如何用纯css实现一个动态画圆环效果,第1张

html结构如下：

</div>

实现的思路就是：

1. 首先定义外层容器大小，本例采用200x200，

.wrap{

position: relative

width: 200px

height: 200px

}

2. 通过border-radius画一个圆环，这个比较简单

.circle{

height: 100%

box-sizing: border-box

border: 20px solid red

border-radius: 50%

}

效果如下：

2. 然后用上下两层挡板遮住这个圆环，通过旋转挡板将圆环慢慢露出，过程如下图所示：

通过将下层挡板旋转180deg就能够实现将下半圆慢慢画出的效果，画完以后就需要将其隐藏起来，那该如何实现呢？

这里我用了opacity这个属性，当100%时将其设置为0，同时设置animation-fill-mode: forwards这样就隐藏了

0%{

transform: rotate( 0 )

}

99%{

transform: rotate( 180deg )

opacity: 1

}

100%{

transform: rotate( 180deg )

opacity: 0

}

3. 那如何显示上半圆呢？同样的思路我们对上面挡板进行旋转，通过实际效果我们可以看到，虽然上半圆露出来了，但是确把下半圆给遮挡了。

如何解决这个问题呢？

我们可以在下半圆和挡板间再放一个半圆，同时设置他们的z-index，让上面的挡板旋转时被下半圆遮住，这样就可以了。

说的有些复杂，相当于我们现在有四个元素：上挡板，下挡板，底部的大圆环，一个处在下挡板和大圆环间的半圆。

它们的z-index如下：

上挡板：1

下挡板和底部的大圆间的半圆：2

下挡板：3

为了不增加额外的元素，下挡板和底部的大圆间的半圆我们通过伪元素来实现

.circle:before{

content: ''

position: absolute

display: block

width: 100%

height: 50%

box-sizing: border-box

top: 50%

left: 0

border: 20px solid red

border-top: transparent

border-radius: 0 0 50% 50%/ 0 0 100% 100%

z-index: 2

}

4. 组后再结合css3的transform动画就可以了，需要注意的是，上挡板和下挡板动画是同时开始了，所以上挡板的动画要设置一个延时，时长就是下挡板动画的时长

本例用到的知识点如下：

1. 如何画一个圆环

2. 如何画一个半圆

3. css3动画

4. 定位

最终代码如下：

<!DOCTYPE html>

<html>

<head>

<title>动态画一个圆环</title>

<style>

margin: 0padding: 0

}

.wrap{

position: relative

width: 200px

height: 200px

}

.circle{

height: 100%

box-sizing: border-box

border: 20px solid red

border-radius: 50%

}

.circle:before{

content: ''

position: absolute

display: block

width: 100%

height: 50%

box-sizing: border-box

top: 50%

left: 0

border: 20px solid red

border-top: transparent

border-radius: 0 0 50% 50%/ 0 0 100% 100%

z-index: 2

}

.top, .bottom{

position: absolute

left: 0px

width: 100%

height: 50%

box-sizing: border-box

background: white

}

.top{

top: 0

z-index: 1

transform-origin: center bottom

animation: 1s back-half linear 1s

animation-fill-mode: forwards

}

.bottom{

z-index: 3

top: 50%

transform-origin: center top

animation: 1s front-half linear

animation-fill-mode: forwards

}

@keyframes front-half{

0%{

transform: rotate( 0 )

}

99%{

transform: rotate( 180deg )

opacity: 1

}

100%{

transform: rotate( 180deg )

opacity: 0

}

@keyframes back-half{

0%{

transform: rotate( 0 )

}

99%{

transform: rotate( 180deg )

opacity: 1

}

100%{

transform: rotate( 180deg )

opacity: 0

}

</style>

</head>

<body>

</div>

</body>

</html>

给你一个例子：

<!doctype html>

<html>

<head>

<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>

<p>loader</p>

</div>

<p>gelatine</p>

</div>

</div>

<p>elastic spin</p>

</div>

<p>pulse</p>

</div>

<p>flash</p>

</div>

<p>hi there!</p>

</div>

</div>

</div>

</div>

<p>bounce</p>

</div>

<p>bounce 2</p>

</div>

<p>shake</p>

</div>

</div>

<p>swing</p>

</div>

<p>wobble</p>

</div>

</div>

</div>

</div>

<p>fade out right</p>

</div>

<p>bounce in</p>

</div>

<p>bounce in right</p>

</div>

<p>bounce out</p>

</div>

<p>bounce out down</p>

</div>

<p>rotate in down left</p>

</div>

<p>rotate in up left</p>

</div>

</div>

</div>

<p>hinge</p>

</div>

</body>

</html>

1、首先新建一个html空白文档，取名字叫做css3动画，保存一下。

2、然后写html结构，只需要一个div元素即可，class名字叫做img

3、设置其边框为不同的颜色，边框宽度设置成100px。

4、因为是圆环，所以我们用到了css3的圆角效果，设置圆角为50%，也就是border-radius:50%，看一下效果。

5、接下来就是关键的步骤了，也就是添加动画效果。输入以下代码

6、来看一下最后的效果，还是不错的。

词库加载错误未能找到文件“E高铁采集器内存溢出ConfigurationDictStopwordstxt”

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# 下一篇：CSS的三种使用方法。行内样式：内嵌式：外部式：

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