html5在线抽奖,HTML5大转盘抽奖特效代码

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闪币", "谢谢参与", "5闪币", "10M免费流量包", "20M免费流量包", "20闪币 ", "30M免费流量包", "100M免费流量包", "2闪币"];

turnplate.colors = ["#FFF4D6", "#FFFFFF", "#FFF4D6", "#FFFFFF","#FFF4D6", "#FFFFFF", "#FFF4D6", "#FFFFFF","#FFF4D6", "#FFFFFF"];

var rotateTimeOut = function (){

$(&＃39;#wheelcanvas&＃39;).rotate({

angle:0,

animateTo:2160,

duration:8000,

callback:function (){

alert(&＃39;网络超时，请检查您的网络设置！&＃39;);

}

});

};

//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;

}

$(&＃39;#wheelcanvas&＃39;).stopRotate();

$(&＃39;#wheelcanvas&＃39;).rotate({

angle:0,

animateTo:angles+1800,

duration:8000,

callback:function (){

alert(txt);

turnplate.bRotate = !turnplate.bRotate;

}

});

};

$(&＃39;.pointer&＃39;).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.οnlοad=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= &＃39;16px Microsoft YaHei&＃39;;

for(var i = 0; 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; j0?&＃39;bold 20px Microsoft YaHei&＃39;:&＃39;16px Microsoft YaHei&＃39;;

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; j2, 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.οnlοad=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.οnlοad=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----

}

}

}