以下是 jQuery+HTML5微信大转盘抽奖代码 的示例演示效果:
部分效果截图:
HTML代码(index.html):
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>jQuery+HTML5微信大转盘抽奖代码</title>
<link href="style.css" rel="stylesheet" type="text/css">
<script type="text/javascript" src="js/jquery-1.10.2.js"></script>
<script type="text/javascript" src="js/awardRotate.js"></script>
<script type="text/javascript">
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 = ["50M免费流量包", "10闪币", "谢谢参与", "5闪币", "10M免费流量包", "20M免费流量包", "20闪币 ", "30M免费流量包", "100M免费流量包", "2闪币"];
turnplate.colors = ["#FFF4D6", "#FFFFFF", "#FFF4D6", "#FFFFFF","#FFF4D6", "#FFFFFF", "#FFF4D6", "#FFFFFF","#FFF4D6", "#FFFFFF"];
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 (){
alert(txt);
turnplate.bRotate = !turnplate.bRotate;
}
});
};
$('.pointer').click(function (){
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);
});
});
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.onload=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
ctx.strokeStyle = "#FFBE04";
//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 Microsoft YaHei';
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----
ctx.fillStyle = "#E5302F";
var text = turnplate.restaraunts[i];
var line_height = 17;
//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("M")>0){//流量包
var texts = text.split("M");
for(var j = 0; j<texts.length; j++){
ctx.font = j == 0?'bold 20px Microsoft YaHei':'16px Microsoft YaHei';
if(j == 0){
ctx.fillText(texts[j]+"M", -ctx.measureText(texts[j]+"M").width / 2, j * line_height);
}else{
ctx.fillText(texts[j], -ctx.measureText(texts[j]).width / 2, j * line_height);
}
}
}else if(text.indexOf("M") == -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.onload=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.onload=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----
}
}
}
</script>
</head>
<body style="background:#e62d2d;overflow-x:hidden;">
<img src="images/1.png" id="shan-img" style="display:none;" />
<img src="images/2.png" id="sorry-img" style="display:none;" />
<div class="banner">
<div class="turnplate" style="background-image:url(images/turnplate-bg.png);background-size:100% 100%;">
<canvas class="item" id="wheelcanvas" width="422px" height="422px"></canvas>
<img class="pointer" src="images/turnplate-pointer.png"/>
</div>
</div>
</body>
</html>JS代码(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 object this._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 Events if (this._parameters.bind){
var oldEvents = this._parameters.bind;
for (var a in oldEvents) if (oldEvents.hasOwnProperty(a)) // TODO:Remove jQuery dependency jQuery(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 back if (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);
CSS代码(style.css):
body,ul,ol,li,p,h1,h2,h3,h4,h5,h6,form,fieldset,table,td,img,div{margin:0;padding:0;border:0;}
body{color:#333;font-size:12px;font-family:"Microsoft YaHei"}
ul,ol{list-style-type:none;}
select,input,img,select{vertical-align:middle;}
input{font-size:12px;}
a{text-decoration:none;color:#000;}
a:hover{color:#c00;text-decoration:none;}
.clear{clear:both;}
/* 大转盘样式 */
.banner{display:block;width:95%;margin-left:auto;margin-right:auto;margin-bottom:20px;}
.banner .turnplate{display:block;width:100%;position:relative;}
.banner .turnplate canvas.item{width:100%;}
.banner .turnplate img.pointer{position:absolute;width:31.5%;height:42.5%;left:34.6%;top:23%;}
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