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turntable.js
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turntable.js
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(function ($) {
/**
* @param {Object} options
* @param {Array} options.list 存储奖品的的列表，example [{1:{name:'谢谢参与',image:'1.jpg'}}]
* @param {Object} options.outerCircle {color:'#df1e15'} 外圈颜色，默认红色
* @param {Object} options.innerCircle {color:'#f4ad26'} 里圈颜色，默认黄色
* @param {Array} options.dots ['#fbf0a9', '#fbb936'] 装饰点颜色 ，默认深黄浅黄交替
* @param {Array} options.disk ['#ffb933', '#ffe8b5', '#ffb933', '#ffd57c', '#ffb933', '#ffe8b5', '#ffd57c'] 中心奖盘的颜色，默认7彩
* @param {Object} options.title {color:'#5c1e08',font:'19px Arial'} 奖品标题颜色
*/
$.fn.WheelSurf = function (options) {
var _default = {
outerCircle: {
color: '#df1e15'
},
innerCircle: {
color: '#f4ad26'
},
dots: ['#fbf0a9', '#fbb936'],
disk: ['#ffb933', '#ffe8b5', '#ffb933', '#ffd57c', '#ffb933', '#ffe8b5', '#ffd57c'],
title: {
color: '#5c1e08',
font: '19px Arial'
}
}
$.extend(_default,options)
// 画布中心移动到canvas中心
var _this = this[0],
width = _this.width,
height = _this.height,
ctx = _this.getContext("2d"),
imgs = [],
awardTitle = [],
awardPic = []
for (var item in _default.list) {
awardTitle.push(_default.list[item].name)
imgs.push(_default.list[item].image)
}
var num = imgs.length
// 圆心
var x = width / 2
var y = height / 2
ctx.translate(x, y)
return {
init: function (angelTo) {
angelTo = angelTo || 0;
ctx.clearRect(-this.width, -this.height, this.width, this.height);
// 平分角度
var angel = (2 * Math.PI / 360) * (360 / num);
var startAngel = 2 * Math.PI / 360 * (-90)
var endAngel = 2 * Math.PI / 360 * (-90) + angel
// 旋转画布
ctx.save()
ctx.rotate(angelTo * Math.PI / 180);
// 画外圆
ctx.beginPath();
ctx.lineWidth = 25;
ctx.strokeStyle = _default.outerCircle.color;
ctx.arc(0, 0, 243, 0, 2 * Math.PI)
ctx.stroke();
// 画里圆
ctx.beginPath();
ctx.lineWidth = 23;
ctx.strokeStyle = _default.innerCircle.color;
ctx.arc(0, 0, 218, 0, 2 * Math.PI)
ctx.stroke();
// 装饰点
var dotColor = _default.dots
for (var i = 0; i < 12; i++) {
// 装饰点 圆心 坐标计算
ctx.beginPath();
var radius = 230;
var xr = radius * Math.cos(startAngel)
var yr = radius * Math.sin(startAngel)
ctx.fillStyle = dotColor[i % dotColor.length]
ctx.arc(xr, yr, 11, 0, 2 * Math.PI)
ctx.fill()
startAngel += (2 * Math.PI / 360) * (360 / 12);
}
// 画里转盘
var colors = _default.disk
for (var i = 0; i < num; i++) {
ctx.beginPath();
ctx.lineWidth = 208;
ctx.strokeStyle = colors[i % colors.length]
ctx.arc(0, 0, 104, startAngel, endAngel)
ctx.stroke();
startAngel = endAngel
endAngel += angel
}
// 添加奖品
function loadImg() {
var dtd = $.Deferred()
var countImg = 0
if (awardPic.length) {
return dtd.resolve(awardPic);
}
for (var i = 0; i < num; i++) {
var img = new Image()
awardPic.push(img)
img.src = imgs[i]
img.onload = function () {
countImg++
if (countImg == num) {
dtd.resolve(awardPic);
}
}
}
return dtd.promise()
}
$.when(loadImg()).done(function (awardPic) {
startAngel = angel / 2
for (var i = 0; i < num; i++) {
ctx.save();
ctx.rotate(startAngel)
ctx.drawImage(awardPic[i], -48, -48 - 130);
ctx.font = _default.title.font;
ctx.fillStyle = _default.title.color
ctx.textAlign = "center";
ctx.fillText(awardTitle[i], 0, -170);
startAngel += angel
ctx.restore();
}
})
ctx.restore();
},
/**
* @param angel 旋转角度
* @param callback 转完后的回调函数
*/
lottery: function (angel, callback) {
angel = angel || 0
angel = 360-angel
angel += 720
// 基值（减速）
var baseStep = 30
// 起始滚动速度
var baseSpeed = 0.3
// 步长
var count = 1;
var _this = this
var timer = setInterval(function () {
_this.init(count)
if (count == angel) {
clearInterval(timer)
if (typeof callback == "function") {
callback()
}
}
count = count + baseStep * (((angel - count) / angel) > baseSpeed ? baseSpeed : ((angel - count) / angel))
if (angel - count < 0.5) {
count = angel
}
}, 25)
}
}
}
}(jQuery))