首先我們先來看下最終的運行效果:
#從效果圖我們可以看到,抽獎會自動進行,並顯示中獎資訊。
這個效果基本上是用CSS實現的,沒有用圖片,加一丟丟JS。完全沒有考慮相容性。
具體步驟如下:
先畫一個轉盤
<!DOCTYPE html> <html> <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> <div> <div>开始抽奖</div> </div> </div> </body> </html>
效果如下,配色什麼的不要在意,可能比較醜。 。 。
然後寫抽獎指標的小箭頭,用CSS畫三角形是比較常見的問題,透過設定width和height為0,然後用border實作。
如圖,矩形是由四個三角形邊框組成的,只要設定其它邊顏色為透明,就可以獲得單獨的三角形。
這裡透過偽元素after實現三角形,並透過絕對定位將三角形定位到中間小圓的頂端。
.pointer::after { content: ''; position: absolute; left: 14px; top: -24px; border-width: 12px 6px; border-style: solid; border-color: transparent; border-bottom-color: #c0381f; }
現在才像個指標了。
接下來是實現唱盤背景,不同的磁區對應不同的獎品,這樣就有需求:實現任一角度扇形。
可能會想當然的認為和三角形一樣,不過是加一個border-radius而已,高度是圓半徑,寬度是tan(θ/2),但是實現出來的效果和想像並不一樣… (可能需要做一些其他操作以達到效果,但是我沒想到。
最後還是求助了搜尋引擎。不得不承認dalao們實在是太nb了,qaq…透過 linear-gradient 實現想法是真的很棒。不過還有好多複雜的實作看的不是很懂= =
How to draw a circle sector in CSS?
Segments in a circle using CSS3
3種純CSS實現中間鏤空的12色彩虹漸層圓環方法
實作就是透過兩個正方形取相交區域。
我覺圖畫的還挺好的:D
沒有用偽元素實現,因為我還要加文字,至於文字的位置,我真的是瞎調的,反正正經寫代碼也不會這麼寫= =
<!DOCTYPE html> <html> <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> <div> <span>谢谢参与</span> </div> </div> </body> </html>
效果如下,一個有文字的小扇形~~
#OK,現在寫一堆扇形放到一開始的轉盤上。
現在的程式碼是醬紫滴~~太長了摺起來。
<!DOCTYPE html> <html> <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> <div> <div> <div> <span>谢谢参与</span> </div> </div> <div> <div> <span> 50 积分</span> </div> </div> <div> <div> <span>谢谢参与</span> </div> </div> <div> <div> <span>100话费</span> </div> </div> <div> <div> <span> 50 积分</span> </div> </div> <div> <div> <span>谢谢参与</span> </div> </div> <div> <div> <span>100话费</span> </div> </div> <div> <div> <span>谢谢参与</span> </div> </div> <div> <div> <span> 50 积分</span> </div> </div> <div> <div> <span>10元话费</span> </div> </div> <div>开始抽奖</div> </div> </div> </body> </html>
嘻嘻,現在是抽獎轉盤的樣子了吧~~~
(學習影片分享:css影片教學)
最後再加點浮誇的燈。
<!DOCTYPE html> <html> <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> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div> <div> <div> <span>谢谢参与</span> </div> </div> <div> <div> <span> 50 积分</span> </div> </div> <div> <div> <span>谢谢参与</span> </div> </div> <div> <div> <span>100话费</span> </div> </div> <div> <div> <span> 50 积分</span> </div> </div> <div> <div> <span>谢谢参与</span> </div> </div> <div> <div> <span>100话费</span> </div> </div> <div> <div> <span>谢谢参与</span> </div> </div> <div> <div> <span> 50 积分</span> </div> </div> <div> <div> <span>10元话费</span> </div> </div> <div>开始抽奖</div> </div> </div> </body> </html>
現在轉盤CSS部分基本上完成。簡單寫JS部分。點擊中間的指針時,指針會轉,可以拉一條貝塞爾曲線,控制動畫的速度。
貝塞爾曲線可以簡單的看作是時間-距離曲線,斜率就是速度。因為轉盤的速度一定是先快後慢,隨便拉一條。
http://cubic-bezier.com/#.2,.93,.43 ,1
css中新增屬性
.pointer { // ... transition: transform 3s cubic-bezier(.2,.93,.43,1); }
點擊開始抽獎的時候,為中間的指標加上一個旋轉的角度。這裡有一個問題就是不同的扇區抽到的機率是相同的,改成不同應該…也蠻簡單的,不過主要是想練下CSS,JS就隨便寫了。
JS部分代碼。
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.deg}deg)`; }) pointer.addEventListener('transitionend', () => { console.log('抽奖结束'); onRotation = false; result.style.display = 'block'; })
現在一個抽獎轉盤基本上完成了,最後一個需求,如果旁邊的等能夠亮起來就好了。
至於燈怎麼亮,就需要用到CSS3的動畫了,我還不太熟悉,先去學習>_<
我學完回來了,參考教學http://www.ruanyifeng.com/blog/2014/02/css_transition_and_animation.html,內容不是很多。
animation-name 指定動畫名稱,
animation-duration 指定動畫持續時間,
animation-timing-function 指定動畫函數,且transition的函數是一樣的,
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> <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> <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> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div> <div> <div> <span>谢谢参与</span> </div> </div> <div> <div> <span> 5 0 积分</span> </div> </div> <div> <div> <span>谢谢参与</span> </div> </div> <div> <div> <span>100元话费</span> </div> </div> <div> <div> <span> 5 0 积分</span> </div> </div> <div> <div> <span>谢谢参与</span> </div> </div> <div> <div> <span>100元话费</span> </div> </div> <div> <div> <span>谢谢参与</span> </div> </div> <div> <div> <span> 5 0 积分</span> </div> </div> <div> <div> <span>10元话费</span> </div> </div> <div>开始抽奖</div> </div> </div> <div></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.deg}deg)`; }) 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>
原文链接:https://www.cnblogs.com/wenruo/p/9732704.html
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