Page({
/**
 * 頁(yè)面的初始數(shù)據(jù)
*/
data: {
awardsConfig: {},
restaraunts: [], //大轉(zhuǎn)盤(pán)獎(jiǎng)品信息
},
/**
 * 生命周期函數(shù)--監(jiān)聽(tīng)頁(yè)面加載
*/
onLoad: function (options) {
var self = this;
wx.getSystemInfo({
//獲取系統(tǒng)信息成功，將系統(tǒng)窗口的寬高賦給頁(yè)面的寬高
success: function (res) {
self.width = res.windowWidth
self.height = res.windowHeight
}
})
self.data.awardsConfig = {
chance: true,
awards: self.data.restaraunts//存放獎(jiǎng)項(xiàng)信息
}
self.tab();
})
},
tab: function() {
var self = this;
// 繪制轉(zhuǎn)盤(pán)
var awardsConfig = self.data.awardsConfig.awards,
len = awardsConfig.length,
rotateDeg = 360 / len / 2 + 90,
html = [],
turnNum = 1 / len // 文字旋轉(zhuǎn) turn 值
self.setData({
btnDisabled: self.data.awardsConfig.chance ? '' : 'disabled'
})
var ctx = wx.createContext();
for (var i = 0; i < len; i++) {
var w = self.width; //頁(yè)面寬
var r = w * 0.38; //圓半徑 0.35w
// 保存當(dāng)前狀態(tài)
ctx.save();
// 開(kāi)始一條新路徑
ctx.beginPath();
// 位移到圓心，下面需要圍繞圓心旋轉(zhuǎn)
// ctx.translate(150, 150);
ctx.translate(w / 2 - 14, w / 2 - 18);
// 從(0, 0)坐標(biāo)開(kāi)始定義一條新的子路徑
ctx.moveTo(0, 0);
// 旋轉(zhuǎn)弧度,需將角度轉(zhuǎn)換為弧度,使用 degrees * Math.PI/180 公式進(jìn)行計(jì)算。
ctx.rotate((360 / len * i - rotateDeg) * Math.PI / 180);
// 繪制圓弧
ctx.arc(0, 0, r, 0, 2 * Math.PI / len, false);
// 顏色間隔
if (i % 2 == 0) {
ctx.setFillStyle('#ffffff');
} else {
ctx.setFillStyle('#ffeab0');
}
// 填充扇形
ctx.fill();
// 繪制邊框
ctx.setLineWidth(0.5);
ctx.setStrokeStyle('#e4370e');
ctx.stroke();
// 恢復(fù)前一個(gè)狀態(tài)
ctx.restore();
// 獎(jiǎng)項(xiàng)列表
html.push({
turn: (i + 1) * turnNum + 'turn',
award: awardsConfig[i]
});
}
self.setData({
awardsList: html
});
wx.drawCanvas({
canvasId: 'canvas',
actions: ctx.getActions()
})
},
inner: function(e) {
const self = this;
if (self.data.awardsConfig.chance) {
self.data.awardsConfig.chance = false;//轉(zhuǎn)動(dòng)時(shí)禁止再次觸發(fā)點(diǎn)擊事件
var json = res.data;//后端自動(dòng)分配獎(jiǎng)項(xiàng)，并傳給前端獎(jiǎng)項(xiàng)信息
var item = parseInt(json.grade); //獲取從1到獎(jiǎng)品數(shù)量之間的隨機(jī)數(shù)
self.getLottery(item + 1, self.data.restaraunts[item]); //獎(jiǎng)項(xiàng)位置 （+1 是為了轉(zhuǎn)動(dòng)的時(shí)候計(jì)算角度），對(duì)應(yīng)獎(jiǎng)項(xiàng)
}
},
getLottery: function(item, txt) {
var self = this
var awardsConfig = self.data.awardsConfig.awards,
len = awardsConfig.length;
var awardIndex = item;
// 獲取獎(jiǎng)品配置
var awardsConfig = self.data.awardsConfig
if (awardIndex < 2) awardsConfig.chance = false
// 初始化 rotate
var animationInit = wx.createAnimation({
duration: 1
})
this.animationInit = animationInit;
animationInit.rotate(0).step()
this.setData({
animationData: animationInit.export(),
btnDisabled: 'disabled'
})
// 旋轉(zhuǎn)抽獎(jiǎng) 執(zhí)行動(dòng)畫(huà)效果
setTimeout(function () {
var animationRun = wx.createAnimation({
duration: 4000,
timingFunction: 'ease'
})
self.animationRun = animationRun
animationRun.rotate(0 - (360 * 8 - awardIndex * (360 / len))).step()
self.setData({
animationData: animationRun.export()
})
}, 100)
// 記錄獎(jiǎng)品
var winAwards = wx.getStorageSync('winAwards') || {
data: []
}
var textInfo = txt === "謝謝參與" ? txt : txt + '1個(gè)';
winAwards.data.push(textInfo)
wx.setStorageSync('winAwards', winAwards)
var jh = parseInt(self.data.jh) - 1;
// 中獎(jiǎng)提示
setTimeout(function () {
if (txt === "謝謝參與") {
wx.showModal({
title: '很遺憾',
content: '祝您好運(yùn)',
showCancel: false
})
} else {
wx.showModal({
title: '恭喜',
content: '獲得' + txt,
showCancel: false
})
}
self.data.awardsConfig.chance = true;
if (awardsConfig.chance) {
self.setData({
btnDisabled: ''
})
}
}, 4100);
},
function(err) {
console.log(err)
console.log("err")
//error
})
},
/**
* 生命周期函數(shù)--監(jiān)聽(tīng)頁(yè)面初次渲染完成
*/
onReady: function() {
// this.drawTurntable(this, new Date());
},
/**
* 生命周期函數(shù)--監(jiān)聽(tīng)頁(yè)面顯示
*/
onShow: function() {
},
/**
* 生命周期函數(shù)--監(jiān)聽(tīng)頁(yè)面隱藏
*/
onHide: function() {
},
/**
* 生命周期函數(shù)--監(jiān)聽(tīng)頁(yè)面卸載
*/
onUnload: function() {
},
/**
* 頁(yè)面相關(guān)事件處理函數(shù)--監(jiān)聽(tīng)用戶(hù)下拉動(dòng)作
*/
onPullDownRefresh: function() {
},
/**
* 頁(yè)面上拉觸底事件的處理函數(shù)
*/
onReachBottom: function() {
},
/**
* 用戶(hù)點(diǎn)擊右上角分享
*/
onShareAppMessage: function() {
}
})