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<!DOCTYPE html>
<html lang="zh-cn">
<head>
<meta charset="UTF-8">
<script type="text/javascript" src="jquery-2.1.4.min.js"></script>
<title>转盘抽奖</title>
<meta name="viewport" content="width=device-width, initial-scale=1, user-scalable=no">
<style type="text/css">
* {
padding: 0px;
margin: 0px;
font-size: 16px;
font-family: "Microsoft YaHei";
}
.turnplate_box {
width: 300px;
height: 300px;
margin: 100px auto;
position: relative;
border: 1px solid red;
}
.turnplate_box canvas {
position: absolute;
border: 1px solid yellow;
}
#myCanvas {
background-color: white;
border-radius: 100%;
}
#myCanvas01,
#myCanvas03 {
left: 50px;
top: 50px;
z-index: 30;
}
#myCanvas02 {
left: 75px;
top: 75px;
z-index: 20;
}
#myCanvas {
-o-transform: transform 6s;
-ms-transform: transform 6s;
-moz-transform: transform 6s;
-webkit-transform: transform 6s;
transition: transform 6s;
-o-transform-origin: 50% 50%;
-ms-transform-origin: 50% 50%;
-moz-transform-origin: 50% 50%;
-webkit-transform-origin: 50% 50%;
transform-origin: 50% 50%;
}
.turnplatw_btn {
width: 60px;
height: 60px;
left: 120px;
top: 120px;
border-radius: 50%;
position: absolute;
cursor: pointer;
border: none;
background: transparent;
outline: none;
z-index: 40;
border: 1px solid red;
}
</style>
<script type="text/javascript">
$(document).ready(function() {
//旋转角度
var angles;
//可抽奖次数
var clickNum = 5;
//旋转次数
var rotNum = 0;
//中奖公告
var notice = null;
//转盘初始化
var color = ["red", "green", "blue", "darkblue", "black", "yellow"];//转盘，转盘，内园，字颜色，开始抽奖颜色，开始抽奖背景颜色
var info = ["谢谢参与", " 1000", " 10", " 500", " 100", " 4999", " 1", " 20"];
var info1 = ['再接再厉', ' 元', ' 万元', ' 淘金币', ' 万美元', ' 淘金币', ' 日游(月球)', ' 个美女']
canvasRun();
$('#tupBtn').bind('click', function() {
alert(1);
if (clickNum >= 1) {
//可抽奖次数减一
clickNum = clickNum - 1;
//转盘旋转
runCup();
//转盘旋转过程“开始抽奖”按钮无法点击
$('#tupBtn').attr("disabled", true);
//旋转次数加一
rotNum = rotNum + 1;
//“开始抽奖”按钮无法点击恢复点击
setTimeout(function() {
alert(notice);
$('#tupBtn').removeAttr("disabled", true);
}, 6000);
} else {
alert("亲，抽奖次数已用光！");
}
});
//转盘旋转
function runCup() {
probability();
var degValue = 'rotate(' + angles + 'deg' + ')';
$('#myCanvas').css('-o-transform', degValue); //Opera
$('#myCanvas').css('-ms-transform', degValue); //IE浏览器
$('#myCanvas').css('-moz-transform', degValue); //Firefox
$('#myCanvas').css('-webkit-transform', degValue); //Chrome和Safari
$('#myCanvas').css('transform', degValue);
}
//各奖项对应的旋转角度及中奖公告内容
function probability() {
//获取随机数
var num = parseInt(Math.random() * (7 - 0 + 0) + 0);
//概率
if (num == 0) {
angles = 2160 * rotNum + 1800;
notice = info[0] + info1[0];
}
//概率
else if (num == 1) {
angles = 2160 * rotNum + 1845;
notice = info[7] + info1[7];
}
//概率
else if (num == 2) {
angles = 2160 * rotNum + 1890;
notice = info[6] + info1[6];
}
//概率
else if (num == 3) {
angles = 2160 * rotNum + 1935;
notice = info[5] + info1[5];
}
//概率
else if (num == 4) {
angles = 2160 * rotNum + 1980;
notice = info[4] + info1[4];
}
//概率
else if (num == 5) {
angles = 2160 * rotNum + 2025;
notice = info[3] + info1[3];
}
//概率
else if (num == 6) {
angles = 2160 * rotNum + 2070;
notice = info[2] + info1[2];
}
//概率
else if (num == 7) {
angles = 2160 * rotNum + 2115;
notice = info[1] + info1[1];
}
}
//绘制转盘
function canvasRun() {
var canvas = document.getElementById('myCanvas');
var canvas01 = document.getElementById('myCanvas01');
var canvas03 = document.getElementById('myCanvas03');
var canvas02 = document.getElementById('myCanvas02');
var ctx = canvas.getContext('2d');
var ctx1 = canvas01.getContext('2d');
var ctx3 = canvas03.getContext('2d');
var ctx2 = canvas02.getContext('2d');
createCircle();
createCirText();
initPoint();
//外圆
function createCircle() {
var startAngle = 0; //扇形的开始弧度
var endAngle = 0; //扇形的终止弧度
//画一个8等份扇形组成的圆形
for (var i = 0; i < 8; i++) {
startAngle = Math.PI * (i / 4 - 1 / 8);
endAngle = startAngle + Math.PI * (1 / 4);
ctx.save();
ctx.beginPath();
ctx.arc(150, 150, 100, startAngle, endAngle, false);
ctx.lineWidth = 120;
if (i % 2 == 0) {
ctx.strokeStyle = color[0];
} else {
ctx.strokeStyle = color[1];
}
ctx.stroke();
ctx.restore();
}
}
//各奖项
function createCirText() {
ctx.textAlign = 'start';
ctx.textBaseline = 'middle';
ctx.fillStyle = color[3];
var step = 2 * Math.PI / 8;
for (var i = 0; i < 8; i++) {
ctx.save();
ctx.beginPath();
ctx.translate(150, 150);
ctx.rotate(i * step);
ctx.font = " 20px Microsoft YaHei";
ctx.fillStyle = color[3];
ctx.fillText(info[i], -30, -115, 60);
ctx.font = " 14px Microsoft YaHei";
ctx.fillText(info1[i], -30, -95, 60);
ctx.closePath();
ctx.restore();
}
}
function initPoint() {
//箭头指针
ctx1.beginPath();
ctx1.moveTo(100, 24);
ctx1.lineTo(90, 62);
ctx1.lineTo(110, 62);
ctx1.lineTo(100, 24);
ctx1.fillStyle = color[5];
ctx1.fill();
ctx1.closePath();
//中间小圆
ctx3.beginPath();
ctx3.arc(100, 100, 40, 0, Math.PI * 2, false);
ctx3.fillStyle = color[5];
ctx3.fill();
ctx3.closePath();
//小圆文字
ctx3.font = "Bold 20px Microsoft YaHei";
ctx3.textAlign = 'start';
ctx3.textBaseline = 'middle';
ctx3.fillStyle = color[4];
ctx3.beginPath();
ctx3.fillText('开始', 80, 90, 40);
ctx3.fillText('抽奖', 80, 110, 40);
ctx3.fill();
ctx3.closePath();
//中间圆圈
ctx2.beginPath();
ctx2.arc(75, 75, 75, 0, Math.PI * 2, false);
ctx2.fillStyle = color[2];
ctx2.fill();
ctx2.closePath();
}
}
});
</script>
</head>
<body>
<div class="turnplate_box">
<canvas id="myCanvas" width="300px" height="300px">抱歉！浏览器不支持。</canvas>
<canvas id="myCanvas01" width="200px" height="200px">抱歉！浏览器不支持。</canvas>
<canvas id="myCanvas03" width="200px" height="200px">抱歉！浏览器不支持。</canvas>
<canvas id="myCanvas02" width="150px" height="150px">抱歉！浏览器不支持。</canvas>
<button id="tupBtn" class="turnplatw_btn"></button>
</div>
<!-- 更改系统默认弹窗 -->
<script type="text/javascript">
window.alert = function(str) {
var shield = document.createElement("DIV");
shield.id = "shield";
shield.style.position = "absolute";
shield.style.left = "50%";
shield.style.top = "50%";
shield.style.width = "280px";
shield.style.height = "150px";
shield.style.marginLeft = "-140px";
shield.style.marginTop = "-110px";
shield.style.zIndex = "25";
var alertFram = document.createElement("DIV");
alertFram.id = "alertFram";
alertFram.style.position = "absolute";
alertFram.style.width = "280px";
alertFram.style.height = "150px";
alertFram.style.left = "50%";
alertFram.style.top = "50%";
alertFram.style.marginLeft = "-140px";
alertFram.style.marginTop = "-110px";
alertFram.style.textAlign = "center";
alertFram.style.lineHeight = "150px";
alertFram.style.zIndex = "300";
strHtml = "<ul style=\"list-style:none;margin:0px;padding:0px;width:100%\">\n";
strHtml += " <li style=\"background:#626262;text-align:left;padding-left:20px;font-size:14px;font-weight:bold;height:25px;line-height:25px;border:1px solid #F9CADE;color:white\">[中奖提醒]</li>\n";
strHtml += " <li style=\"background:#787878;text-align:center;font-size:12px;height:95px;line-height:95px;border-left:1px solid #F9CADE;border-right:1px solid #F9CADE;color:#DCC722\">" + str + "</li>\n";
strHtml += " <li style=\"background:#626262;text-align:center;font-weight:bold;height:30px;line-height:25px; border:1px solid #F9CADE;\"><input type=\"button\" value=\"确 定\" onclick=\"doOk()\" style=\"width:80px;height:20px;background:#626262;color:white;border:1px solid white;font-size:14px;line-height:20px;outline:none;margin-top: 4px\"/></li>\n";
strHtml += "</ul>\n";
alertFram.innerHTML = strHtml;
document.body.appendChild(alertFram);
document.body.appendChild(shield);
this.doOk = function() {
alertFram.style.display = "none";
shield.style.display = "none";
}
alertFram.focus();
document.body.onselectstart = function() {
return false;
};
}
</script>
</body>
</html>标签：
原文地址：http://blog.csdn.net/u014421556/article/details/51967836
