<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>大转盘抽奖</title>
<link href="./css/style.css" rel="stylesheet" type="text/css">
<script type="text/javascript" src="js/jquery.2.0.0.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
randomRate: [], //控制获奖率，百分制(相加需等于100%)，对应restaraunts(顺序需要保持一致)，
bRotate: false, //false:停止;ture:旋转
i: 0
};
$(document).ready(function () {
//动态添加大转盘的奖品与奖品区域背景颜色
turnplate.restaraunts = ["一等奖", "二等奖", "三等奖", "四等奖", "五等奖", "liu等奖", "七等奖 ", "八等奖", "九等奖", "十等奖"];
turnplate.colors = ["#FFF4D6", "#FFFFFF", "#FFF4D6", "#FFFFFF", "#FFF4D6", "#FFFFFF", "#FFF4D6", "#FFFFFF", "#FFF4D6", "#FFFFFF"];
var rotateTimeOut = function () {
$('#wheelcanvas').rotate({
angle: 0,
animateTo: 2160,
duration: 1000,
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;
}
});
};
// var i = 0;
$('.pointer').click(function () {
if (turnplate.i == 1) {
turnplate.randomRate = ["100%", '0%', '0%', '0%', '0%', '0%', '0%', '0%', '0%', '0%'];
} else {
turnplate.randomRate = ['10%', '10%', '10%', '10%', '10%', '10%', '10%', '10%', '10%', '10%'];
}
turnplate.i++;
if (turnplate.bRotate) return;
turnplate.bRotate = !turnplate.bRotate;
//获取随机数(奖品个数范围内)
var item = rnd(turnplate.randomRate);
//奖品数量等于10,指针落在对应奖品区域的中心角度[252, 216, 180, 144, 108, 72, 36, 360, 324, 288]
rotateFn(item, turnplate.restaraunts[item - 1]);
});
});
function rnd(rate) {
var random = Math.floor(Math.random() * 100);
var myRandom = [];
var randomList = [];
var randomParent = [];
for (var i = 0; i < 100; i++) {
myRandom.push(parseInt([i]) + 1);
}
for (var i = 0; i < rate.length; i++) {
var temp = [];
var start = 0;
var end = 0;
randomList.push(parseInt(rate[i].split('%')[0]));
for (var j = 0; j < randomList.length; j++) {
start += randomList[j - 1] || 0
end += randomList[j]
}
temp = myRandom.slice(start, end);
randomParent.push(temp)
}
for (var i = 0; i < randomParent.length; i++) {
if ($.inArray(random, randomParent[i]) > 0) {
return (i + 1)
}
}
}
//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("猫币") > 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: rgb(100, 130, 51); 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%;margin-top:30%;">
<canvas class="item" id="wheelcanvas" width="422px" height="422px" style="transform: rotate(252deg);"></canvas>
<img class="pointer" src="images/turnplate-pointer.png">
</div>
</div>
</body>
</html>