jquery摇号抽奖交互效果-html代码-BFW代码库

代码语言：html
所属分类：大转盘
代码描述：jquery摇号抽奖交互效果
下面为部分代码预览，完整代码请点击下载或在bfwstudio webide中打开
<!doctype html>
<html>
<head>
<meta charset="utf-8">

<title>大转盘活动</title>

<script type="text/javascript" src="http://repo.bfw.wiki/bfwrepo/js/jquery.17.js"></script>
<script type="text/javascript" src="http://repo.bfw.wiki/bfwrepo/js/awardRotate.min.js"></script>
<style>
    body,ul,ol,li,p,h1,h2,h3,h4,h5,h6,form,fieldset,table,td,img,div{margin:0;padding:0;border:0}body{color:#333;font-size:12px;font-family:microsoft yahei}ul,ol{list-style-type:none}select,input,img,select{vertical-align:middle}input{font-size:12px}a{text-decoration:none;color:#000}a:hover{color:#c00;text-decoration:none}.clear{clear:both}.banner{display:block;width:95%;margin-left:auto;margin-right:auto;margin-bottom:20px;margin-top:50px}.banner .turnplate{display:block;width:100%;position:relative}.banner .turnplate canvas.item{width:100%}.banner .turnplate img.pointer{position:absolute;width:31.5%;height:42.5%;left:34.6%;top:23%}
</style>
<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
		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积分", "谢谢参与", "50积分", "20积分", "谢谢参与"];
	turnplate.colors = ["#FFF4D6", "#FFFFFF", "#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.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;
			}
		});
	};

	$('.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]);
		/* switch (item) {
			case 1:
				rotateFn(252, turnplate.restaraunts[0]);
				break;
			case 2:
				rotateFn(216, turnplate.restaraunts[1]);
				break;
			case 3:
				rotateFn(180, turnplate.restaraunts[2]);
				break;
			case 4:
				rotateFn(144, turnplate.restaraunts[3]);
				break;
			case 5:
				rotateFn(108, turnplate.restaraunts[4]);
				break;
			case 6:
				rotateFn(72, turnplate.restaraunts[5]);
				break;
			case 7:
				rotateFn(36, turnplate.restaraunts[6]);
				break;
			case 8:
				rotateFn(360, turnplate.restaraunts[7]);
				break;
			case 9:
				rotateFn(324, turnplate.restaraunts[8]);
				break;
			case 10:
				rotateFn(288, turnplate.restaraunts[9]);
				break;
		} */
		console.log(item);
	});
});

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(0,0,422,422);
	  //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("闪币")>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:#e62d2d;overflow-x:hidden;">
<img src="data:image/png;base64,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" id="shan-img" style="display:none;" />
<img src="data:image/png;base64,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" id="sorry-img" style="display:none;" />
<div class="banner">
<div class="turnplate" style="background-image:url(data:image/png;base64,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.........完整代码请登录后点击上方下载按钮下载查看