用 CSS 实现一个抽奖转盘(附详细代码+思路)
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作者:我不吃饼干呀
https://www.cnblogs.com/wenruo/p/9732704.html
效果
基本是用CSS实现的,没有用图片,加一丢丢JS。完全没有考虑兼容性。
首先画一个转盘,
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>幸运大转盘</title>
<style>
/* 重置默认样式 */ * margin: 0; padding: 0; border: none; outline: none;
.wrapper position: relative; height: 200px; width: 200px; padding: 20px; margin: 20px; background-color: #c0381f; box-shadow: #000000 0px 0px 10px; border-radius: 50%;
.panel position: relative; height: 200px; width: 200px; background-color: #b7b7b7; border-radius: 100px;
.pointer position: absolute; left: 79px; top: 79px; z-index: 10; height: 30px; width: 30px; padding: 6px; color: #fff899; line-height: 15px; font-size: 12px; text-align: center; background-color: #dc5b5b; border-radius: 50%; border: 1px solid #c0381f;
</style>
</head>
<body>
<div class="wrapper">
<div class="panel">
<div class="pointer">开始抽奖</div>
</div>
</div>
</body>
</html>
效果如下,配色什么的不要在意,可能比较丑。。。
然后写抽奖指针的小箭头,用CSS画三角形是一个比较常见的问题,通过设置width和height为0,然后用border实现。
如图,矩形是由四个三角形边框组成的,只要设置其它边颜色为透明,就可以获得单独的三角形。
这里通过伪元素after实现三角形,并通过绝对定位将三角形定位到中间小圆的顶端。
.pointer::after content: ''; position: absolute; left: 14px; top: -24px; border-width: 12px 6px; border-style: solid; border-color: transparent; border-bottom-color: #c0381f;
现在才像一个指针了。
哦 接下来是实现转盘背景,不同的扇区对应不同的奖品,这样就有一个需求:实现任意角度扇形。
可能会想当然的认为和三角形一样,不过是加一个border-radius而已,高度是圆半径,宽度是tan(θ/2),但是实现出来的效果和想象并不一样……(可能需要做一些其他操作以达到效果,但是我没想到。
最后还是求助了搜索引擎。不得不承认dalao们实在是太nb了,qaq……通过 linear-gradient 实现想法是真的棒。不过还有好多复杂的实现看的不是很懂= =
How to draw a circle sector in CSS?
Segments in a circle using CSS3
3种纯CSS实现中间镂空的12色彩虹渐变圆环方法
实现就是通过两个正方形取相交区域。
我觉图画的还是挺好的:D
没有用伪元素实现,因为我还要加文字,至于文字的位置,我真的是瞎调的,反正正经写代码也不会这么写= =
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style> .sector position: absolute; width: 100px; height: 200px; margin: 100px; border-radius: 0px 100px 100px 0; overflow: hidden; transform: rotate(-18deg);
.sector-inner text-align: center; display: block; width: 40px; padding: 5px 3px 0 57px; height: 195px; background: #ffeab1; transform: translateX(-100px) rotate(36deg); transform-origin: right center; border-radius: 100px 0 0 100px;
.sector-inner span display: block; transform-origin: center; transform: rotate(-19deg); color: #d46854;
</style>
</head>
<body>
<div class="sector">
<div class="sector-inner">
<span>谢谢参与</span>
</div>
</div>
</body>
</html>
效果如下,一个带有文字的小扇形~~
OK,现在写一堆扇形放到一开始的转盘上。
现在的代码是酱紫滴~~太长了折起来。
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>幸运大转盘</title>
<style>
/* 重置默认样式 */ * margin: 0; padding: 0; border: none; outline: none;
.wrapper position: relative; height: 200px; width: 200px; padding: 20px; margin: 20px; background-color: #c0381f; box-shadow: #000000 0px 0px 10px; border-radius: 50%;
.panel position: relative; height: 200px; width: 200px; background-color: #b7b7b7; border-radius: 100px;
.sector position: absolute; width: 100px; height: 200px; border-radius: 0px 100px 100px 0; overflow: hidden; left: 100px; top: 0px; transform-origin: left center;
.sector:nth-child(1) transform: rotate(-18deg);
.sector:nth-child(2) transform: rotate(18deg);
.sector:nth-child(3) transform: rotate(54deg);
.sector:nth-child(4) transform: rotate(90deg);
.sector:nth-child(5) transform: rotate(126deg);
.sector:nth-child(6) transform: rotate(162deg);
.sector:nth-child(7) transform: rotate(198deg);
.sector:nth-child(8) transform: rotate(234deg);
.sector:nth-child(9) transform: rotate(270deg);
.sector:nth-child(10) transform: rotate(306deg);
.sector:nth-child(2n+1) .sector-inner background: #fef6e0;
.sector:nth-child(2n) .sector-inner background: #ffffff;
.sector-inner text-align: center; display: block; width: 40px; padding: 5px 3px 0 57px; height: 195px; transform: translateX(-100px) rotate(36deg); transform-origin: right center; border-radius: 100px 0 0 100px;
.sector-inner span display: block; transform-origin: center; transform: rotate(-19deg); color: #d46854;
.pointer position: absolute; left: 79px; top: 79px; z-index: 10; height: 30px; width: 30px; padding: 6px; color: #fff899; line-height: 15px; font-size: 12px; text-align: center; background-color: #dc5b5b; border-radius: 50%; border: 1px solid #c0381f;
.pointer::after content: ''; position: absolute; left: 14px; top: -24px; border-width: 12px 6px; border-style: solid; border-color: transparent; border-bottom-color: #c0381f;
</style>
</head>
<body>
<div class="wrapper">
<div class="panel">
<div class="sector">
<div class="sector-inner">
<span>谢谢参与</span>
</div>
</div>
<div class="sector">
<div class="sector-inner">
<span> 50 积分</span>
</div>
</div>
<div class="sector">
<div class="sector-inner">
<span>谢谢参与</span>
</div>
</div>
<div class="sector">
<div class="sector-inner">
<span>100话费</span>
</div>
</div>
<div class="sector">
<div class="sector-inner">
<span> 50 积分</span>
</div>
</div>
<div class="sector">
<div class="sector-inner">
<span>谢谢参与</span>
</div>
</div>
<div class="sector">
<div class="sector-inner">
<span>100话费</span>
</div>
</div>
<div class="sector">
<div class="sector-inner">
<span>谢谢参与</span>
</div>
</div>
<div class="sector">
<div class="sector-inner">
<span> 50 积分</span>
</div>
</div>
<div class="sector">
<div class="sector-inner">
<span>10元话费</span>
</div>
</div>
<div class="pointer">开始抽奖</div>
</div>
</div>
</body>
</html>
嘻嘻,现在是抽奖转盘的样子了吧~~~
最后再加点浮夸的灯。
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>幸运大转盘</title>
<style>
/* 重置默认样式 */ * margin: 0; padding: 0; border: none; outline: none;
.wrapper position: relative; height: 200px; width: 200px; padding: 20px; margin: 20px; background-color: #c0381f; box-shadow: #000000 0px 0px 10px; border-radius: 50%;
.light position: absolute; height: 10px; width: 10px; border-radius: 50%; top: 5px; left: 115px; transform-origin: 5px 115px;
.light:nth-child(2n) background-color: #fafce7;
.light:nth-child(2n+1) background-color: #ffe58b;
.light:nth-child(2) transform: rotate(36deg);
.light:nth-child(3) transform: rotate(72deg);
.light:nth-child(4) transform: rotate(108deg);
.light:nth-child(5) transform: rotate(144deg);
.light:nth-child(6) transform: rotate(180deg);
.light:nth-child(7) transform: rotate(216deg);
.light:nth-child(8) transform: rotate(252deg);
.light:nth-child(9) transform: rotate(288deg);
.light:nth-child(10) transform: rotate(324deg);
.panel position: relative; height: 200px; width: 200px; background-color: #b7b7b7; border-radius: 100px;
.sector position: absolute; width: 100px; height: 200px; border-radius: 0px 100px 100px 0; overflow: hidden; left: 100px; top: 0px; transform-origin: left center;
.sector:nth-child(1) transform: rotate(-18deg);
.sector:nth-child(2) transform: rotate(18deg);
.sector:nth-child(3) transform: rotate(54deg);
.sector:nth-child(4) transform: rotate(90deg);
.sector:nth-child(5) transform: rotate(126deg);
.sector:nth-child(6) transform: rotate(162deg);
.sector:nth-child(7) transform: rotate(198deg);
.sector:nth-child(8) transform: rotate(234deg);
.sector:nth-child(9) transform: rotate(270deg);
.sector:nth-child(10) transform: rotate(306deg);
.sector:nth-child(2n+1) .sector-inner background: #fef6e0;
.sector:nth-child(2n) .sector-inner background: #ffffff;
.sector-inner text-align: center; display: block; width: 40px; padding: 5px 3px 0 57px; height: 195px; transform: translateX(-100px) rotate(36deg); transform-origin: right center; border-radius: 100px 0 0 100px;
.sector-inner span display: block; transform-origin: center; transform: rotate(-19deg); color: #d46854;
.pointer position: absolute; left: 79px; top: 79px; z-index: 10; height: 30px; width: 30px; padding: 6px; color: #fff899; line-height: 15px; font-size: 12px; text-align: center; background-color: #dc5b5b; border-radius: 50%; border: 1px solid #c0381f;
.pointer::after content: ''; position: absolute; left: 14px; top: -24px; border-width: 12px 6px; border-style: solid; border-color: transparent; border-bottom-color: #c0381f;
</style>
</head>
<body>
<div class="wrapper">
<div class="light"></div>
<div class="light"></div>
<div class="light"></div>
<div class="light"></div>
<div class="light"></div>
<div class="light"></div>
<div class="light"></div>
<div class="light"></div>
<div class="light"></div>
<div class="light"></div>
<div class="panel">
<div class="sector">
<div class="sector-inner">
<span>谢谢参与</span>
</div>
</div>
<div class="sector">
<div class="sector-inner">
<span> 50 积分</span>
</div>
</div>
<div class="sector">
<div class="sector-inner">
<span>谢谢参与</span>
</div>
</div>
<div class="sector">
<div class="sector-inner">
<span>100话费</span>
</div>
</div>
<div class="sector">
<div class="sector-inner">
<span> 50 积分</span>
</div>
</div>
<div class="sector">
<div class="sector-inner">
<span>谢谢参与</span>
</div>
</div>
<div class="sector">
<div class="sector-inner">
<span>100话费</span>
</div>
</div>
<div class="sector">
<div class="sector-inner">
<span>谢谢参与</span>
</div>
</div>
<div class="sector">
<div class="sector-inner">
<span> 50 积分</span>
</div>
</div>
<div class="sector">
<div class="sector-inner">
<span>10元话费</span>
</div>
</div>
<div class="pointer">开始抽奖</div>
</div>
</div>
</body>
</html>
现在转盘CSS部分基本完成。简单写一下JS部分。点击中间的指针时,指针会转,可以拉一条贝塞尔曲线,控制动画的速度。
贝塞尔曲线可以简单的看作是时间-距离曲线,斜率就是速度。因为转盘的速度肯定是先快后慢,随便拉一条。
http://cubic-bezier.com/#.2,.93,.43,1
CSS中添加属性
.pointer // ... transition: transform 3s cubic-bezier(.2,.93,.43,1);
点击开始抽奖的时候,为中间的指针加一个旋转的角度。这里有一个问题就是不同的扇区抽到的概率是相同的,改成不同应该…也蛮简单的,不过主要是想练下CSS,JS就随便写了。
JS部分代码。。
let getEle = document.getElementsByClassName.bind(document);
let pointer = getEle('pointer')[0];
let result = getEle('result')[0];
let onRotation = false; // 记录当前是否正在旋转,如果正在旋转,就不能继续点击了
let reward = ['谢谢参与', '50积分', '谢谢参与', '100元话费', '50积分', '谢谢参与', '100元话费', '谢谢参与', '50积分', '10元话费']; // 根据随机角度获取奖励
let getReward = (function()
currentDeg = 0; return function() // 转三圈到四圈
let rotateDeg = Math.random() * 360 + 1080;
currentDeg += rotateDeg;
let rewardText = reward[Math.floor((currentDeg + 18) % 360 / 36)] return
deg: currentDeg,
text: rewardText === '谢谢参与' ? '很遗憾,您没有获得奖品。' : '恭喜获得: ' + rewardText
)();
pointer.addEventListener('click', () => if (onRotation) return;
console.log('开始抽奖');
onRotation = true;
let nextStatus = getReward();
console.log(nextStatus)
result.innerText = nextStatus.text;
result.style.display = 'none';
pointer.style.transform = `rotateZ($nextStatus.degdeg)`;
)
pointer.addEventListener('transitionend', () =>
console.log('抽奖结束');
onRotation = false;
result.style.display = 'block';
)
现在一个抽奖转盘基本完成了,最后一个需求,如果旁边的等能够亮起来就好了。
至于灯怎么亮,就需要用到CSS3的动画了,我还不太熟悉,先去学习一下>_<
我学完回来了,参考教程http://www.ruanyifeng.com/blog/2014/02/css_transition_and_animation.html,内容不是很多。
animation-name 指定动画名称,
animation-duration 指定动画持续时间,
animation-timing-function 指定动画函数,和transition的函数是一样的,
animation-delay 指定动画延迟多久后执行,
animation-iteration-count 指定动画执行多少次,默认为一次,可以指定为infinite,无限循环。
animation-direction 指定动画多次播放时,一次结束,下一次怎么接上一次,如图。
animation-fill-mode 指定动画结束后停在什么位置,默认回到起始状态,
forwards表示让动画停留在结束状态,
backwards让动画回到第一帧的状态,
both根据animation-direction轮流应用forwards和backwards规则。
animation-play-state 动画执行状态,默认为running,可以设置为pause,动画将在当前状态停止,再改为running时,会接着上一次停止的位置继续执行动画。
使用关键字 keyframes 来定义一个动画。通过百分比指定其中任意几个状态。
尝试着写一下=。=
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style> div height: 30px; width: 30px; animation: 1s twinkling 3, 100ms 3s twinkling 3;
@keyframes twinkling 50% background: red; </style>
</head>
<body>
<div></div>
</body>
</html>
这是一个方块,先慢速闪三下,再快速闪三下,最后消失。
animation: 1s twinkling 3;
就相当于
animation-name: twinkling;
animation-duration: 1s;
animation-timing-function: ease;
animation-delay: 0s;
animation-iteration-count: 3;
animation-direction: normal;
animation-fill-mode: none;
animation-play-state: running;
效果
我觉得还可以:P 反正我只能写成这样了。
最后把动画加到转盘的灯上。完成代码(好像颜色变了,咳,那是因为我animation学了太久都掉色了):
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>幸运大转盘</title>
<style> * /* 重置默认样式 */ margin: 0; padding: 0; border: none; outline: none; user-select: none;
.wrapper position: relative; height: 200px; width: 200px; padding: 20px; margin: 20px; background-color: #ff5555; box-shadow: #000000 0px 0px 10px; border-radius: 50%;
.light position: absolute; height: 10px; width: 10px; border-radius: 50%; top: 5px; left: 115px; transform-origin: 5px 115px;
.light-twinkling animation: 1s twinkling 3, 100ms 3s twinkling 3;
.light:nth-child(2n) background-color: #fafce7;
.light:nth-child(2n+1) background-color: #ffe58b;
.light:nth-child(2) transform: rotate(36deg);
.light:nth-child(3) transform: rotate(72deg);
.light:nth-child(4) transform: rotate(108deg);
.light:nth-child(5) transform: rotate(144deg);
.light:nth-child(6) transform: rotate(180deg);
.light:nth-child(7) transform: rotate(216deg);
.light:nth-child(8) transform: rotate(252deg);
.light:nth-child(9) transform: rotate(288deg);
.light:nth-child(10) transform: rotate(324deg);
.panel position: relative; height: 200px; width: 200px; background-color: #b7b7b7; border-radius: 100px;
.sector position: absolute; left: 100px; top: 0px; width: 100px; height: 200px; font-size: 14px; border-radius: 0px 100px 100px 0; overflow: hidden; transform-origin: left center;
.sector:nth-child(1) transform: rotate(-18deg);
.sector:nth-child(2) transform: rotate(18deg);
.sector:nth-child(3) transform: rotate(54deg);
.sector:nth-child(4) transform: rotate(90deg);
.sector:nth-child(5) transform: rotate(126deg);
.sector:nth-child(6) transform: rotate(162deg);
.sector:nth-child(7) transform: rotate(198deg);
.sector:nth-child(8) transform: rotate(234deg);
.sector:nth-child(9) transform: rotate(270deg);
.sector:nth-child(10) transform: rotate(306deg);
.sector:nth-child(2n+1) .sector-inner background: #fef6e0;
.sector:nth-child(2n) .sector-inner background: #ffffff;
.sector-inner text-align: center; display: block; width: 40px; padding: 5px 3px 0 57px; height: 195px; transform: translateX(-100px) rotate(36deg); transform-origin: right center; border-radius: 100px 0 0 100px;
.sector-inner span display: block; transform-origin: center; transform: rotate(-19deg); color: #d46854;
.pointer position: absolute; left: 79px; top: 79px; z-index: 10; height: 30px; width: 30px; padding: 6px; color: #fff899; line-height: 15px; font-size: 12px; text-align: center; background-color: #ff5350; border-radius: 50%; border: 1px solid #ff5350; transition: transform 3s cubic-bezier(.2,.93,.43,1);
.pointer::after content: ''; position: absolute; left: 14px; top: -24px; border-width: 12px 6px; border-style: solid; border-color: transparent; border-bottom-color: #ff5350; transform-origin: center;
.result margin: 20px 60px;
@keyframes twinkling 50% background: transparent; </style>
</head>
<body>
<div class="wrapper">
<div class="light"></div>
<div class="light"></div>
<div class="light"></div>
<div class="light"></div>
<div class="light"></div>
<div class="light"></div>
<div class="light"></div>
<div class="light"></div>
<div class="light"></div>
<div class="light"></div>
<div class="panel">
<div class="sector">
<div class="sector-inner">
<span>谢谢参与</span>
</div>
</div>
<div class="sector">
<div class="sector-inner">
<span> 5 0 积分</span>
</div>
</div>
<div class="sector">
<div class="sector-inner">
<span>谢谢参与</span>
</div>
</div>
<div class="sector">
<div class="sector-inner">
<span>100元话费</span>
</div>
</div>
<div class="sector">
<div class="sector-inner">
<span> 5 0 积分</span>
</div>
</div>
<div class="sector">
<div class="sector-inner">
<span>谢谢参与</span>
</div>
</div>
<div class="sector">
<div class="sector-inner">
<span>100元话费</span>
</div>
</div>
<div class="sector">
<div class="sector-inner">
<span>谢谢参与</span>
</div>
</div>
<div class="sector">
<div class="sector-inner">
<span> 5 0 积分</span>
</div>
</div>
<div class="sector">
<div class="sector-inner">
<span>10元话费</span>
</div>
</div>
<div class="pointer">开始抽奖</div>
</div>
</div>
<div class="result"></div>
<script> let getEle = document.getElementsByClassName.bind(document);
let pointer = getEle('pointer')[0];
let result = getEle('result')[0];
let lights = Array.prototype.slice.call(getEle('light'));
let onRotation = false; // 记录当前是否正在旋转,如果正在旋转,就不能继续点击了
let reward = ['谢谢参与', '50积分', '谢谢参与', '100元话费', '50积分', '谢谢参与', '100元话费', '谢谢参与', '50积分', '10元话费']; // 根据随机角度获取奖励
let getReward = (function()
currentDeg = 0; return function() // 转三圈到四圈
let rotateDeg = Math.random() * 360 + 1080;
currentDeg += rotateDeg;
let rewardText = reward[Math.floor((currentDeg + 18) % 360 / 36)] return
deg: currentDeg,
text: rewardText === '谢谢参与' ? '很遗憾,您没有获得奖品。' : '恭喜获得: ' + rewardText
)();
pointer.addEventListener('click', () => if (onRotation) return;
console.log('开始抽奖');
onRotation = true;
lights.forEach(light => light.className += ' light-twinkling'; );
let nextStatus = getReward();
console.log(nextStatus)
result.innerText = nextStatus.text;
result.style.display = 'none';
pointer.style.transform = `rotateZ($nextStatus.degdeg)`;
)
pointer.addEventListener('transitionend', () =>
console.log('抽奖结束');
setTimeout(() => // 等闪烁三下结束
onRotation = false;
lights.forEach(light => light.className = 'light'; );
result.style.display = 'block';
, 300);
) </script>
</body>
</html>
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