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金币","谢谢参与","5金币","10M免费流量包","20M免费流量包","20金币 ","30M免费流量包","100M免费流量包","2金币"];
turnplate.colors = ["#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.length2));
if(angles<270){
angles = 270 - angles;
}else{
angles = 360 - angles + 270;
}
$('#wheelcanvas').stopRotate();
$('#wheelcanvas').rotate({
angle:0,animateTo:angles+1800,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]);
});
});

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(0,422,422);
//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,turnplate.insideRadius,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],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("金币")>0){
var img= document.getElementById("shan-img");
img.onload=function(){
ctx.drawImage(img,-15,10);
};
ctx.drawImage(img,10);
}else if(text.indexOf("谢谢参与")>=0){
var img= document.getElementById("sorry-img");
img.onload=function(){
ctx.drawImage(img,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----
}
}
}