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 = ["碧根果一袋", "年货红包", "水果拼盘300元月卡", "2元现金红包", "夏威夷果一袋", "3元现金红包", "松子一袋 ", "5元现金红包"];
turnplate.colors = ["#FFFFFF","#5fcbd5", "#FFFFFF", "#5fcbd5", "#FFFFFF","#5fcbd5", "#FFFFFF", "#5fcbd5" ];
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 (){ //回调
alert('恭喜中奖了');
}
});
};
$('.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 = 'bold 18px 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();
//改变画布文字颜色
var b = i+2;
if(b%2){
ctx.fillStyle = "#FFFFFF";
}else{
ctx.fillStyle = "#E5302F";
};
//----绘制奖品开始----
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("盘")>0){//判断字符进行换行
var texts = text.split("盘");
for(var j = 0; j8){//奖品名称长度超过一定范围
text = text.substring(0,8)+"||"+text.substring(8);
var texts = text.split("||");
for(var j = 0; j=0){
var img= document.getElementById("diy1-img");
img.onload=function(){
ctx.drawImage(img,-35,20);
};
ctx.drawImage(img,-35,20);
};
if(text.indexOf(turnplate.restaraunts[1])>=0){
var img= document.getElementById("shan-img");
img.onload=function(){
ctx.drawImage(img,-35,20);
};
ctx.drawImage(img,-35,20);
};
if(text.indexOf(turnplate.restaraunts[2])>=0){
var img= document.getElementById("diy5-img");
img.onload=function(){
ctx.drawImage(img,-25,35);
};
ctx.drawImage(img,-30,35);
};
if(text.indexOf(turnplate.restaraunts[3])>=0){
var img= document.getElementById("shan-img");
img.onload=function(){
ctx.drawImage(img,-35,20);
};
ctx.drawImage(img,-35,20);
};
if(text.indexOf(turnplate.restaraunts[4])>=0){
var img= document.getElementById("diy3-img");
img.onload=function(){
ctx.drawImage(img,-30,20);
};
ctx.drawImage(img,-30,20);
};
if(text.indexOf(turnplate.restaraunts[5])>=0){
var img= document.getElementById("shan-img");
img.onload=function(){
ctx.drawImage(img,-35,20);
};
ctx.drawImage(img,-35,20);
};
if(text.indexOf(turnplate.restaraunts[6])>=0){
var img= document.getElementById("diy2-img");
img.onload=function(){
ctx.drawImage(img,-30,20);
};
ctx.drawImage(img,-30,20);
};
if(text.indexOf(turnplate.restaraunts[7])>=0){
var img= document.getElementById("shan-img");
img.onload=function(){
ctx.drawImage(img,-35,20);
};
ctx.drawImage(img,-35,20);
};
//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----
}
}
};
