首先看下效果图：

1、JSP页面代码

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@taglib prefix="s" uri="/struts-tags"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><!DOCTYPE html>
<html>
<head lang="en"><meta name="viewport" content="width=device-width,initial-scale=1,maximum-scale=1,user-scalable=no"><meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"><meta name="HandheldFriendly" content="true"><meta http-equiv="Content-Type" content="text/html; charset=utf-8"><title>转盘抽奖</title><link href="<%=basePath%>wxfront/css/common.css" rel="stylesheet" type="text/css">
</head>
<body style="background-color: #259ee0;">
<input id="names" type="hidden" value='<s:property value="name"/>'>
<input id="colors" type="hidden" value='<s:property value="colors"/>'>
<section class="max-width turnplate-box"><article class="top"><img src="<%=basePath%>wxfront/images/xydzp.png"/><p><a>您有<span class="num"><s:property value="num"/></span>次抽奖机会</a></p></article><article class="turn-plate"><div class="banner"><div class="turnplate" style="background-image:url(<%=basePath%>wxfront/images/turnplate-bg.png);background-size:100% 100%;"><canvas class="item" id="wheelcanvas" width="422px" height="422px"></canvas><img class="pointer" src="<%=basePath%>wxfront/images/turnplate-pointer.png"/></div></div></article><article class="bottom"><a class="btns"><button>抽奖说明</button><button>我的奖品</button></a><a class="msg-text"><i class="icon-jiao"></i><div><p>1、每次抽奖需要消耗10个积分；</p><p>2、除去积分立返外，每月第三周会统一发送活动奖品；</p><p>3、活动奖品图仅供参考，我们会为您寄送同等价值的同类产品，实际奖品以收货为准。</p></div></a></article>
</section>
</body>
<script src="<%=basePath%>wxfront/js/jquery-1.7.min.js"></script>
<script src="<%=basePath%>wxfront/js/awardRotate.js"></script>
<script src="<%=basePath%>wxfront/js/turnplate.js"></script>
</html>

2、awardRotate.js

(function($) {var supportedCSS,styles=document.getElementsByTagName("head")[0].style,toCheck="transformProperty WebkitTransform OTransform msTransform MozTransform".split(" ");for (var a=0;a<toCheck.length;a++) if (styles[toCheck[a]] !== undefined) supportedCSS = toCheck[a];
// Bad eval to preven google closure to remove it from code o_O
// After compresion replace it back to var IE = 'v' == '\v'var IE = eval('"v"=="\v"');jQuery.fn.extend({rotate:function(parameters){if (this.length===0||typeof parameters=="undefined") return;if (typeof parameters=="number") parameters={angle:parameters};var returned=[];for (var i=0,i0=this.length;i<i0;i++){var element=this.get(i);if (!element.Wilq32 || !element.Wilq32.PhotoEffect) {var paramClone = $.extend(true, {}, parameters);var newRotObject = new Wilq32.PhotoEffect(element,paramClone)._rootObj;returned.push($(newRotObject));}else {element.Wilq32.PhotoEffect._handleRotation(parameters);}}return returned;},getRotateAngle: function(){var ret = [];for (var i=0,i0=this.length;i<i0;i++){var element=this.get(i);if (element.Wilq32 && element.Wilq32.PhotoEffect) {ret[i] = element.Wilq32.PhotoEffect._angle;}}return ret;},stopRotate: function(){for (var i=0,i0=this.length;i<i0;i++){var element=this.get(i);if (element.Wilq32 && element.Wilq32.PhotoEffect) {clearTimeout(element.Wilq32.PhotoEffect._timer);}}}});// Library agnostic interfaceWilq32=window.Wilq32||{};Wilq32.PhotoEffect=(function(){if (supportedCSS) {return function(img,parameters){img.Wilq32 = {PhotoEffect: this};this._img = this._rootObj = this._eventObj = img;this._handleRotation(parameters);}} else {return function(img,parameters) {// Make sure that class and id are also copied - just in case you would like to refeer to an newly created objectthis._img = img;this._rootObj=document.createElement('span');this._rootObj.style.display="inline-block";this._rootObj.Wilq32 ={PhotoEffect: this};img.parentNode.insertBefore(this._rootObj,img);if (img.complete) {this._Loader(parameters);} else {var self=this;// TODO: Remove jQuery dependencyjQuery(this._img).bind("load", function(){self._Loader(parameters);});}}}})();Wilq32.PhotoEffect.prototype={_setupParameters : function (parameters){this._parameters = this._parameters || {};if (typeof this._angle !== "number") this._angle = 0 ;if (typeof parameters.angle==="number") this._angle = parameters.angle;this._parameters.animateTo = (typeof parameters.animateTo==="number") ? (parameters.animateTo) : (this._angle);this._parameters.step = parameters.step || this._parameters.step || null;this._parameters.easing = parameters.easing || this._parameters.easing || function (x, t, b, c, d) { return -c * ((t=t/d-1)*t*t*t - 1) + b; }this._parameters.duration = parameters.duration || this._parameters.duration || 1000;this._parameters.callback = parameters.callback || this._parameters.callback || function(){};if (parameters.bind && parameters.bind != this._parameters.bind) this._BindEvents(parameters.bind);},_handleRotation : function(parameters){this._setupParameters(parameters);if (this._angle==this._parameters.animateTo) {this._rotate(this._angle);}else {this._animateStart();}},_BindEvents:function(events){if (events && this._eventObj){// Unbinding previous Eventsif (this._parameters.bind){var oldEvents = this._parameters.bind;for (var a in oldEvents) if (oldEvents.hasOwnProperty(a))// TODO: Remove jQuery dependencyjQuery(this._eventObj).unbind(a,oldEvents[a]);}this._parameters.bind = events;for (var a in events) if (events.hasOwnProperty(a))// TODO: Remove jQuery dependencyjQuery(this._eventObj).bind(a,events[a]);}},_Loader:(function(){if (IE)return function(parameters){var width=this._img.width;var height=this._img.height;this._img.parentNode.removeChild(this._img);this._vimage = this.createVMLNode('image');this._vimage.src=this._img.src;this._vimage.style.height=height+"px";this._vimage.style.width=width+"px";this._vimage.style.position="absolute"; // FIXES IE PROBLEM - its only rendered if its on absolute position!this._vimage.style.top = "0px";this._vimage.style.left = "0px";/* Group minifying a small 1px precision problem when rotating object */this._container =  this.createVMLNode('group');this._container.style.width=width;this._container.style.height=height;this._container.style.position="absolute";this._container.setAttribute('coordsize',width-1+','+(height-1)); // This -1, -1 trying to fix ugly problem with small displacement on IEthis._container.appendChild(this._vimage);this._rootObj.appendChild(this._container);this._rootObj.style.position="relative"; // FIXES IE PROBLEMthis._rootObj.style.width=width+"px";this._rootObj.style.height=height+"px";this._rootObj.setAttribute('id',this._img.getAttribute('id'));this._rootObj.className=this._img.className;this._eventObj = this._rootObj;this._handleRotation(parameters);}elsereturn function (parameters){this._rootObj.setAttribute('id',this._img.getAttribute('id'));this._rootObj.className=this._img.className;this._width=this._img.width;this._height=this._img.height;this._widthHalf=this._width/2; // used for optimisationthis._heightHalf=this._height/2;// used for optimisationvar _widthMax=Math.sqrt((this._height)*(this._height) + (this._width) * (this._width));this._widthAdd = _widthMax - this._width;this._heightAdd = _widthMax - this._height;   // widthMax because maxWidth=maxHeightthis._widthAddHalf=this._widthAdd/2; // used for optimisationthis._heightAddHalf=this._heightAdd/2;// used for optimisationthis._img.parentNode.removeChild(this._img);this._aspectW = ((parseInt(this._img.style.width,10)) || this._width)/this._img.width;this._aspectH = ((parseInt(this._img.style.height,10)) || this._height)/this._img.height;this._canvas=document.createElement('canvas');this._canvas.setAttribute('width',this._width);this._canvas.style.position="relative";this._canvas.style.left = -this._widthAddHalf + "px";this._canvas.style.top = -this._heightAddHalf + "px";this._canvas.Wilq32 = this._rootObj.Wilq32;this._rootObj.appendChild(this._canvas);this._rootObj.style.width=this._width+"px";this._rootObj.style.height=this._height+"px";this._eventObj = this._canvas;this._cnv=this._canvas.getContext('2d');this._handleRotation(parameters);}})(),_animateStart:function(){if (this._timer) {clearTimeout(this._timer);}this._animateStartTime = +new Date;this._animateStartAngle = this._angle;this._animate();},_animate:function(){var actualTime = +new Date;var checkEnd = actualTime - this._animateStartTime > this._parameters.duration;// TODO: Bug for animatedGif for static rotation ? (to test)if (checkEnd && !this._parameters.animatedGif){clearTimeout(this._timer);}else{if (this._canvas||this._vimage||this._img) {var angle = this._parameters.easing(0, actualTime - this._animateStartTime, this._animateStartAngle, this._parameters.animateTo - this._animateStartAngle, this._parameters.duration);this._rotate((~~(angle*10))/10);}if (this._parameters.step) {this._parameters.step(this._angle);}var self = this;this._timer = setTimeout(function(){self._animate.call(self);}, 10);}// To fix Bug that prevents using recursive function in callback I moved this function to backif (this._parameters.callback && checkEnd){this._angle = this._parameters.animateTo;this._rotate(this._angle);this._parameters.callback.call(this._rootObj);}},_rotate : (function(){var rad = Math.PI/180;if (IE)return function(angle){this._angle = angle;this._container.style.rotation=(angle%360)+"deg";}else if (supportedCSS)return function(angle){this._angle = angle;this._img.style[supportedCSS]="rotate("+(angle%360)+"deg)";}elsereturn function(angle){this._angle = angle;angle=(angle%360)* rad;// clear canvasthis._canvas.width = this._width+this._widthAdd;this._canvas.height = this._height+this._heightAdd;// REMEMBER: all drawings are read from backwards.. so first function is translate, then rotate, then translate, translate..this._cnv.translate(this._widthAddHalf,this._heightAddHalf);   // at least center image on screenthis._cnv.translate(this._widthHalf,this._heightHalf);            // we move image back to its orginalthis._cnv.rotate(angle);                                        // rotate imagethis._cnv.translate(-this._widthHalf,-this._heightHalf);     // move image to its center, so we can rotate around its centerthis._cnv.scale(this._aspectW,this._aspectH); // SCALE - if needed ;)this._cnv.drawImage(this._img, 0, 0);                           // First - we draw image}})()}if (IE){Wilq32.PhotoEffect.prototype.createVMLNode=(function(){document.createStyleSheet().addRule(".rvml", "behavior:url(#default#VML)");try {!document.namespaces.rvml && document.namespaces.add("rvml", "urn:schemas-microsoft-com:vml");return function (tagName) {return document.createElement('<rvml:' + tagName + ' class="rvml">');};} catch (e) {return function (tagName) {return document.createElement('<' + tagName + ' xmlns="urn:schemas-microsoft.com:vml" class="rvml">');};}})();}
})(jQuery);

3、turnplate.js代码

/*** Created by gzbugu on 2016-05-17.*/
var turnplate={restaraunts:[],              //大转盘奖品名称colors:[],                 //大转盘奖品区块对应背景颜色outsideRadius:192,           //大转盘外圆的半径textRadius:155,               //大转盘奖品位置距离圆心的距离insideRadius:68,            //大转盘内圆的半径startAngle:0,             //开始角度bRotate:false             //false:停止;ture:旋转
};$(document).ready(function(){//动态添加大转盘的奖品与奖品区域背景颜色turnplate.restaraunts = $("#names").val().split(",");turnplate.colors = $("#colors").val().split(",");var rotateTimeOut = function (){$('#wheelcanvas').rotate({angle:0,animateTo:2160,duration:8000,callback:function (){alert('网络超时，请检查您的网络设置！');}});};//旋转转盘 item:奖品位置; txt：提示语;var rotateFn = function (item, txt){var angles = item * (360 / turnplate.restaraunts.length) - (360 / (turnplate.restaraunts.length*2));if(angles<270){angles = 270 - angles;}else{angles = 360 - angles + 270;}$('#wheelcanvas').stopRotate();$('#wheelcanvas').rotate({angle:0,animateTo:angles+1800,duration:8000,callback:function (){$(".num").text($(".num").text()-1);alert(txt);turnplate.bRotate = !turnplate.bRotate;}});};$('.pointer').click(function (){if($(".num").text()!=0){if(turnplate.bRotate)return;turnplate.bRotate = !turnplate.bRotate;//获取随机数(奖品个数范围内)var item = rnd(1,turnplate.restaraunts.length);//奖品数量等于10,指针落在对应奖品区域的中心角度[252, 216, 180, 144, 108, 72, 36, 360, 324, 288]rotateFn(item, turnplate.restaraunts[item-1]);/* switch (item) {case 1:rotateFn(252, turnplate.restaraunts[0]);break;case 2:rotateFn(216, turnplate.restaraunts[1]);break;case 3:rotateFn(180, turnplate.restaraunts[2]);break;case 4:rotateFn(144, turnplate.restaraunts[3]);break;case 5:rotateFn(108, turnplate.restaraunts[4]);break;case 6:rotateFn(72, turnplate.restaraunts[5]);break;case 7:rotateFn(36, turnplate.restaraunts[6]);break;case 8:rotateFn(360, turnplate.restaraunts[7]);break;case 9:rotateFn(324, turnplate.restaraunts[8]);break;case 10:rotateFn(288, turnplate.restaraunts[9]);break;} */console.log(item);}else{alert("您的抽奖机会已用完！");}});
});function rnd(n, m){var random = Math.floor(Math.random()*(m-n+1)+n);return random;}//页面所有元素加载完毕后执行drawRouletteWheel()方法对转盘进行渲染
window.οnlοad=function(){drawRouletteWheel();
};function drawRouletteWheel() {var canvas = document.getElementById("wheelcanvas");if (canvas.getContext) {//根据奖品个数计算圆周角度var arc = Math.PI / (turnplate.restaraunts.length/2);var ctx = canvas.getContext("2d");//在给定矩形内清空一个矩形ctx.clearRect(0,0,422,422);//strokeStyle 属性设置或返回用于笔触的颜色、渐变或模式//画布颜色ctx.strokeStyle = "#fff";//font 属性设置或返回画布上文本内容的当前字体属性ctx.font = '16px 微软雅黑 #fff';for(var i = 0; i < turnplate.restaraunts.length; i++) {var angle = turnplate.startAngle + i * arc;ctx.fillStyle = turnplate.colors[i];ctx.beginPath();//arc(x,y,r,起始角,结束角,绘制方向) 方法创建弧/曲线（用于创建圆或部分圆）ctx.arc(211, 211, turnplate.outsideRadius, angle, angle + arc, false);ctx.arc(211, 211, turnplate.insideRadius, angle + arc, angle, true);ctx.stroke();ctx.fill();//锁画布(为了保存之前的画布状态)ctx.save();//----绘制奖品开始----//字体颜色ctx.fillStyle = "#fff";var text = turnplate.restaraunts[i];var line_height = 22;//translate方法重新映射画布上的 (0,0) 位置ctx.translate(211 + Math.cos(angle + arc / 2) * turnplate.textRadius, 211 + Math.sin(angle + arc / 2) * turnplate.textRadius);//rotate方法旋转当前的绘图ctx.rotate(angle + arc / 2 + Math.PI / 2);/** 下面代码根据奖品类型、奖品名称长度渲染不同效果，如字体、颜色、图片效果。(具体根据实际情况改变) **/if(text.indexOf("元")>0){//流量包var texts = text.split("元");for(var j = 0; j<texts.length; j++){ctx.font = j == 0?'bold 20px 微软雅黑':'20px 微软雅黑';if(j == 0){ctx.fillText(texts[j]+"元", -ctx.measureText(texts[j]+"元").width / 2, j * line_height);}else{ctx.fillText(texts[j], -ctx.measureText(texts[j]).width / 2, j * line_height);}}}else if(text.indexOf("元") == -1 && text.length>6){//奖品名称长度超过一定范围text = text.substring(0,6)+"||"+text.substring(6);var texts = text.split("||");for(var j = 0; j<texts.length; j++){ctx.fillText(texts[j], -ctx.measureText(texts[j]).width / 2, j * line_height);}}else{//在画布上绘制填色的文本。文本的默认颜色是黑色//measureText()方法返回包含一个对象，该对象包含以像素计的指定字体宽度ctx.fillText(text, -ctx.measureText(text).width / 2, 0);}//添加对应图标/*if(text.indexOf("闪币")>0){var img= document.getElementById("shan-img");img.οnlοad=function(){ctx.drawImage(img,-15,10);};ctx.drawImage(img,-15,10);}else if(text.indexOf("谢谢参与")>=0){var img= document.getElementById("sorry-img");img.οnlοad=function(){ctx.drawImage(img,-15,10);};ctx.drawImage(img,-15,10);}*///把当前画布返回（调整）到上一个save()状态之前ctx.restore();//----绘制奖品结束----}}
}

4、common.css代码

@charset "utf-8";
html {font-family: sans-serif; /* 1 */-ms-text-size-adjust: 100%; /* 2 */-webkit-text-size-adjust: 100%; /* 2 */
}
body,
button,
input,
ul,
li,
p,
div,
i,
span,
a,
header,
article,
section,
iframe,
footer,
b,
address,
aside{font-family:微软雅黑;margin:0;padding:0;list-style:none;text-decoration:none;word-wrap:break-word;outline: none;
}
body{background-color: #fff;font-size: 14px;
}

5、图片素材

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HTML精美大转盘源码

首先看下效果图：

1、JSP页面代码

2、awardRotate.js

3、turnplate.js代码

4、common.css代码

5、图片素材

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