HTML5 Canvas圆盘抽奖应用DEMO
html页面
HTML5 Canvas圆盘抽奖应用DEMO演示
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CSS页面代码段
*{
padding: 0px;
margin: 0px;
font-size: 16px;
font-family: "Microsoft YaHei";
}
.turnplate_box{
width: 300px;
height: 300px;
margin: 100px auto;
position: relative;
}
.turnplate_box canvas{
position: absolute;
}
#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: 100%;
position: absolute;
cursor: pointer;
border: none;
background: transparent;
outline: none;
z-index: 40;
}
JS
$(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 = ["#626262","#787878","rgba(0,0,0,0.5)","#DCC722","white","#FF4350"];
var info = ["谢谢参与"," 1000"," 10"," 500"," 100"," 4999"," 1"," 20"];
var info1 = ['再接再厉',' 元',' 元',' 淘金币',' 元',' 淘金币',' 元',' 淘金币']
canvasRun();
$('#tupBtn').bind('click',function(){
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();
}
}
});
