javascript HTML5 Canvas는 디스크 복권 function_javascript 기술을 구현합니다.-JS 튜토리얼-php.cn

WeChat 복권, Taobao 복권, Xunlei Money Making 디스크 복권 등 구매 금액이 일정 금액에 도달하면 복권 활동과 같은 다양한 전자상거래 우대 활동에 자주 참여합니다. 이러한 복권 활동은 HTML5 Canvas에서 부분적으로 생성됩니다. 오늘은 HTML5 Canvas를 사용하여 디스크 복권 기능을 만드는 방법을 알려 드리겠습니다. 늘 그렇듯이 먼저 렌더링을 살펴보겠습니다.
캔버스의 주요 API 중 일부를 살펴보겠습니다.
전체 소스코드는 다음과 같습니다.
<!DOCTYPE html>
<html lang="zh-cn">
<head>
<meta charset="UTF-8">
<title>HTML5 Canvas圆盘抽奖应用DEMO演示</title>
<meta name="viewport" content="width=device-width, initial-scale=1, user-scalable=no">
<style>
*{padding: 0px;margin: 0px;font-size: 16px;font-family: "Microsoft YaHei";}
.xttblog_box{width: 300px;height: 300px;margin: 100px auto;position: relative; }
.xttblog_box canvas{position: absolute;}
#xttblog{background-color: white;border-radius: 100%;}
#xttblog01,#xttblog03{left: 50px;top: 50px;z-index: 30;}
#xttblog02{left: 75px;top: 75px;z-index: 20;}
#xttblog{-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%;}
.taoge_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;}
</style>
<script type="text/javascript" src="http://cdn.bootcss.com/jquery/1.11.3/jquery.min.js"></script>
<script>
$(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'+')';
  $('#xttblog').css('-o-transform',degValue);   //Opera
  $('#xttblog').css('-ms-transform',degValue);   //IE浏览器
  $('#xttblog').css('-moz-transform',degValue);   //Firefox
  $('#xttblog').css('-webkit-transform',degValue);  //Chrome和Safari
  $('#xttblog').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('xttblog');
  var canvas01=document.getElementById('xttblog01');
  var canvas03=document.getElementById('xttblog03');
  var canvas02=document.getElementById('xttblog02');
  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="xttblog_box">
 <canvas id="xttblog" width="300px" height="300px">抱歉！浏览器不支持。</canvas>
 <canvas id="xttblog01" width="200px" height="200px">抱歉！浏览器不支持。</canvas>
 <canvas id="xttblog03" width="200px" height="200px">抱歉！浏览器不支持。</canvas>
 <canvas id="xttblog02" width="150px" height="150px">抱歉！浏览器不支持。</canvas>
 <button id="tupBtn" class="taoge_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>
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